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-rw-r--r--gdhcp/client.c300
-rw-r--r--gdhcp/gdhcp.h3
-rw-r--r--gdhcp/ipv4ll.c139
-rw-r--r--gdhcp/ipv4ll.h55
4 files changed, 489 insertions, 8 deletions
diff --git a/gdhcp/client.c b/gdhcp/client.c
index 12d927eb..3508b1e8 100644
--- a/gdhcp/client.c
+++ b/gdhcp/client.c
@@ -32,6 +32,7 @@
#include <arpa/inet.h>
#include <netpacket/packet.h>
+#include <netinet/if_ether.h>
#include <net/ethernet.h>
#include <linux/if.h>
@@ -41,6 +42,7 @@
#include "gdhcp.h"
#include "common.h"
+#include "ipv4ll.h"
#define DISCOVER_TIMEOUT 3
#define DISCOVER_RETRIES 10
@@ -52,6 +54,7 @@ typedef enum _listen_mode {
L_NONE,
L2,
L3,
+ L_ARP,
} ListenMode;
typedef enum _dhcp_client_state {
@@ -61,6 +64,10 @@ typedef enum _dhcp_client_state {
RENEWING,
REBINDING,
RELEASED,
+ IPV4LL_PROBE,
+ IPV4LL_ANNOUNCE,
+ IPV4LL_MONITOR,
+ IPV4LL_DEFEND,
} ClientState;
struct _GDHCPClient {
@@ -79,6 +86,7 @@ struct _GDHCPClient {
int listener_sockfd;
uint8_t retry_times;
uint8_t ack_retry_times;
+ uint8_t conflicts;
guint timeout;
guint listener_watch;
GIOChannel *listener_channel;
@@ -88,10 +96,14 @@ struct _GDHCPClient {
GHashTable *send_value_hash;
GDHCPClientEventFunc lease_available_cb;
gpointer lease_available_data;
+ GDHCPClientEventFunc ipv4ll_available_cb;
+ gpointer ipv4ll_available_data;
GDHCPClientEventFunc no_lease_cb;
gpointer no_lease_data;
GDHCPClientEventFunc lease_lost_cb;
gpointer lease_lost_data;
+ GDHCPClientEventFunc ipv4ll_lost_cb;
+ gpointer ipv4ll_lost_data;
GDHCPClientEventFunc address_conflict_cb;
gpointer address_conflict_data;
GDHCPDebugFunc debug_func;
@@ -267,7 +279,83 @@ static int send_release(GDHCPClient *dhcp_client,
server, SERVER_PORT);
}
+static gboolean ipv4ll_probe_timeout(gpointer dhcp_data);
+static int switch_listening_mode(GDHCPClient *dhcp_client,
+ ListenMode listen_mode);
+
+static gboolean send_probe_packet(gpointer dhcp_data)
+{
+ GDHCPClient *dhcp_client;
+ guint timeout;
+
+ dhcp_client = dhcp_data;
+ /* if requested_ip is not valid, pick a new address*/
+ if (dhcp_client->requested_ip == 0) {
+ debug(dhcp_client, "pick a new random address");
+ dhcp_client->requested_ip = ipv4ll_random_ip(0);
+ }
+
+ debug(dhcp_client, "sending IPV4LL probe request");
+
+ if (dhcp_client->retry_times == 1) {
+ dhcp_client->state = IPV4LL_PROBE;
+ switch_listening_mode(dhcp_client, L_ARP);
+ }
+ ipv4ll_send_arp_packet(dhcp_client->mac_address, 0,
+ dhcp_client->requested_ip, dhcp_client->ifindex);
+
+ if (dhcp_client->retry_times < PROBE_NUM) {
+ /*add a random timeout in range of PROBE_MIN to PROBE_MAX*/
+ timeout = ipv4ll_random_delay_ms(PROBE_MAX-PROBE_MIN);
+ timeout += PROBE_MIN*1000;
+ } else
+ timeout = (ANNOUNCE_WAIT * 1000);
+
+ dhcp_client->timeout = g_timeout_add_full(G_PRIORITY_HIGH,
+ timeout,
+ ipv4ll_probe_timeout,
+ dhcp_client,
+ NULL);
+ return FALSE;
+}
+
+static gboolean ipv4ll_announce_timeout(gpointer dhcp_data);
+static gboolean ipv4ll_defend_timeout(gpointer dhcp_data);
+
+static gboolean send_announce_packet(gpointer dhcp_data)
+{
+ GDHCPClient *dhcp_client;
+ dhcp_client = dhcp_data;
+
+ debug(dhcp_client, "sending IPV4LL announce request");
+
+ ipv4ll_send_arp_packet(dhcp_client->mac_address,
+ dhcp_client->requested_ip,
+ dhcp_client->requested_ip,
+ dhcp_client->ifindex);
+
+ if (dhcp_client->timeout > 0)
+ g_source_remove(dhcp_client->timeout);
+ dhcp_client->timeout = 0;
+
+ if (dhcp_client->state == IPV4LL_DEFEND) {
+ dhcp_client->timeout =
+ g_timeout_add_seconds_full(G_PRIORITY_HIGH,
+ DEFEND_INTERVAL,
+ ipv4ll_defend_timeout,
+ dhcp_client,
+ NULL);
+ return TRUE;
+ } else
+ dhcp_client->timeout =
+ g_timeout_add_seconds_full(G_PRIORITY_HIGH,
+ ANNOUNCE_INTERVAL,
+ ipv4ll_announce_timeout,
+ dhcp_client,
+ NULL);
+ return TRUE;
+}
static void get_interface_mac_address(int index, uint8_t *mac_address)
{
@@ -350,8 +438,10 @@ GDHCPClient *g_dhcp_client_new(GDHCPType type,
dhcp_client->type = type;
dhcp_client->ifindex = ifindex;
dhcp_client->lease_available_cb = NULL;
+ dhcp_client->ipv4ll_available_cb = NULL;
dhcp_client->no_lease_cb = NULL;
dhcp_client->lease_lost_cb = NULL;
+ dhcp_client->ipv4ll_lost_cb = NULL;
dhcp_client->address_conflict_cb = NULL;
dhcp_client->listener_watch = 0;
dhcp_client->retry_times = 0;
@@ -516,6 +606,131 @@ static int dhcp_recv_l2_packet(struct dhcp_packet *dhcp_pkt, int fd)
return bytes - (sizeof(packet.ip) + sizeof(packet.udp));
}
+static void ipv4ll_start(GDHCPClient *dhcp_client)
+{
+ guint timeout;
+ int seed;
+
+ if (dhcp_client->timeout > 0) {
+ g_source_remove(dhcp_client->timeout);
+ dhcp_client->timeout = 0;
+ }
+
+ switch_listening_mode(dhcp_client, L_NONE);
+ dhcp_client->type = G_DHCP_IPV4LL;
+ dhcp_client->retry_times = 0;
+ dhcp_client->requested_ip = 0;
+
+ /*try to start with a based mac address ip*/
+ seed = (dhcp_client->mac_address[4] << 8 | dhcp_client->mac_address[4]);
+ dhcp_client->requested_ip = ipv4ll_random_ip(seed);
+
+ /*first wait a random delay to avoid storm of arp request on boot*/
+ timeout = ipv4ll_random_delay_ms(PROBE_WAIT);
+
+ dhcp_client->retry_times++;
+ dhcp_client->timeout = g_timeout_add_full(G_PRIORITY_HIGH,
+ timeout,
+ send_probe_packet,
+ dhcp_client,
+ NULL);
+}
+
+static void ipv4ll_stop(GDHCPClient *dhcp_client)
+{
+
+ switch_listening_mode(dhcp_client, L_NONE);
+
+ if (dhcp_client->timeout > 0)
+ g_source_remove(dhcp_client->timeout);
+
+ if (dhcp_client->listener_watch > 0) {
+ g_source_remove(dhcp_client->listener_watch);
+ dhcp_client->listener_watch = 0;
+ }
+
+ dhcp_client->state = IPV4LL_PROBE;
+ dhcp_client->retry_times = 0;
+ dhcp_client->requested_ip = 0;
+
+ g_free(dhcp_client->assigned_ip);
+ dhcp_client->assigned_ip = NULL;
+}
+
+static int ipv4ll_recv_arp_packet(GDHCPClient *dhcp_client)
+{
+ int bytes;
+ struct ether_arp arp;
+ uint32_t ip_requested;
+ int source_conflict;
+ int target_conflict;
+
+ memset(&arp, 0, sizeof(arp));
+ bytes = 0;
+ bytes = read(dhcp_client->listener_sockfd, &arp, sizeof(arp));
+ if (bytes < 0)
+ return bytes;
+
+ if (arp.arp_op != htons(ARPOP_REPLY) &&
+ arp.arp_op != htons(ARPOP_REQUEST))
+ return -EINVAL;
+
+ ip_requested = ntohl(dhcp_client->requested_ip);
+ source_conflict = !memcmp(arp.arp_spa, &ip_requested,
+ sizeof(ip_requested));
+
+ target_conflict = !memcmp(arp.arp_tpa, &ip_requested,
+ sizeof(ip_requested));
+
+ if (!source_conflict && !target_conflict)
+ return 0;
+
+ dhcp_client->conflicts++;
+
+ debug(dhcp_client, "IPV4LL conflict detected");
+
+ if (dhcp_client->state == IPV4LL_MONITOR) {
+ if (!source_conflict)
+ return 0;
+ dhcp_client->state = IPV4LL_DEFEND;
+ debug(dhcp_client, "DEFEND mode conflicts : %d",
+ dhcp_client->conflicts);
+ /*Try to defend with a single announce*/
+ send_announce_packet(dhcp_client);
+ return 0;
+ }
+
+ if (dhcp_client->state == IPV4LL_DEFEND) {
+ if (!source_conflict)
+ return 0;
+ else if (dhcp_client->ipv4ll_lost_cb != NULL)
+ dhcp_client->ipv4ll_lost_cb(dhcp_client,
+ dhcp_client->ipv4ll_lost_data);
+ }
+
+ ipv4ll_stop(dhcp_client);
+
+ if (dhcp_client->conflicts < MAX_CONFLICTS) {
+ /*restart whole state machine*/
+ dhcp_client->retry_times++;
+ dhcp_client->timeout =
+ g_timeout_add_full(G_PRIORITY_HIGH,
+ ipv4ll_random_delay_ms(PROBE_WAIT),
+ send_probe_packet,
+ dhcp_client,
+ NULL);
+ }
+ /* Here we got a lot of conflicts, RFC3927 states that we have
+ * to wait RATE_LIMIT_INTERVAL before retrying,
+ * but we just report failure.
+ */
+ else if (dhcp_client->no_lease_cb != NULL)
+ dhcp_client->no_lease_cb(dhcp_client,
+ dhcp_client->no_lease_data);
+
+ return 0;
+}
+
static gboolean check_package_owner(GDHCPClient *dhcp_client,
struct dhcp_packet *packet)
{
@@ -578,6 +793,8 @@ static int switch_listening_mode(GDHCPClient *dhcp_client,
else if (listen_mode == L3)
listener_sockfd = dhcp_l3_socket(CLIENT_PORT,
dhcp_client->interface);
+ else if (listen_mode == L_ARP)
+ listener_sockfd = ipv4ll_arp_socket(dhcp_client->ifindex);
else
return -EIO;
@@ -613,10 +830,7 @@ static void start_request(GDHCPClient *dhcp_client)
if (dhcp_client->retry_times == REQUEST_RETRIES) {
dhcp_client->state = INIT_SELECTING;
-
- if (dhcp_client->no_lease_cb != NULL)
- dhcp_client->no_lease_cb(dhcp_client,
- dhcp_client->no_lease_data);
+ ipv4ll_start(dhcp_client);
return;
}
@@ -927,6 +1141,10 @@ static gboolean listener_event(GIOChannel *channel, GIOCondition condition,
re = dhcp_recv_l2_packet(&packet, dhcp_client->listener_sockfd);
else if (dhcp_client->listen_mode == L3)
re = dhcp_recv_l3_packet(&packet, dhcp_client->listener_sockfd);
+ else if (dhcp_client->listen_mode == L_ARP) {
+ re = ipv4ll_recv_arp_packet(dhcp_client);
+ return TRUE;
+ }
else
re = -EIO;
@@ -1023,15 +1241,73 @@ static gboolean discover_timeout(gpointer user_data)
return FALSE;
}
+static gboolean ipv4ll_defend_timeout(gpointer dhcp_data)
+{
+ GDHCPClient *dhcp_client = dhcp_data;
+
+ debug(dhcp_client, "back to MONITOR mode");
+
+ dhcp_client->conflicts = 0;
+ dhcp_client->state = IPV4LL_MONITOR;
+
+ return FALSE;
+}
+
+static gboolean ipv4ll_announce_timeout(gpointer dhcp_data)
+{
+ GDHCPClient *dhcp_client = dhcp_data;
+ uint32_t ip;
+
+ debug(dhcp_client, "request timeout (retries %d)",
+ dhcp_client->retry_times);
+
+ if (dhcp_client->retry_times != ANNOUNCE_NUM){
+ dhcp_client->retry_times++;
+ send_announce_packet(dhcp_client);
+ return FALSE;
+ }
+
+ ip = htonl(dhcp_client->requested_ip);
+ debug(dhcp_client, "switching to monitor mode");
+ dhcp_client->state = IPV4LL_MONITOR;
+ dhcp_client->assigned_ip = get_ip(ip);
+
+ if (dhcp_client->ipv4ll_available_cb != NULL)
+ dhcp_client->ipv4ll_available_cb(dhcp_client,
+ dhcp_client->ipv4ll_available_data);
+ dhcp_client->conflicts = 0;
+
+ return FALSE;
+}
+
+static gboolean ipv4ll_probe_timeout(gpointer dhcp_data)
+{
+
+ GDHCPClient *dhcp_client = dhcp_data;
+
+ debug(dhcp_client, "IPV4LL probe timeout (retries %d)",
+ dhcp_client->retry_times);
+
+ if (dhcp_client->retry_times == PROBE_NUM) {
+ dhcp_client->state = IPV4LL_ANNOUNCE;
+ dhcp_client->retry_times = 0;
+
+ dhcp_client->retry_times++;
+ send_announce_packet(dhcp_client);
+ return FALSE;
+ }
+ dhcp_client->retry_times++;
+ send_probe_packet(dhcp_client);
+
+ return FALSE;
+}
+
int g_dhcp_client_start(GDHCPClient *dhcp_client)
{
int re;
if (dhcp_client->retry_times == DISCOVER_RETRIES) {
- if (dhcp_client->no_lease_cb != NULL)
- dhcp_client->no_lease_cb(dhcp_client,
- dhcp_client->no_lease_data);
-
+ ipv4ll_start(dhcp_client);
return 0;
}
@@ -1104,6 +1380,10 @@ void g_dhcp_client_register_event(GDHCPClient *dhcp_client,
dhcp_client->lease_available_cb = func;
dhcp_client->lease_available_data = data;
return;
+ case G_DHCP_CLIENT_EVENT_IPV4LL_AVAILABLE:
+ dhcp_client->ipv4ll_available_cb = func;
+ dhcp_client->ipv4ll_available_data = data;
+ return;
case G_DHCP_CLIENT_EVENT_NO_LEASE:
dhcp_client->no_lease_cb = func;
dhcp_client->no_lease_data = data;
@@ -1112,6 +1392,10 @@ void g_dhcp_client_register_event(GDHCPClient *dhcp_client,
dhcp_client->lease_lost_cb = func;
dhcp_client->lease_lost_data = data;
return;
+ case G_DHCP_CLIENT_EVENT_IPV4LL_LOST:
+ dhcp_client->ipv4ll_lost_cb = func;
+ dhcp_client->ipv4ll_lost_data = data;
+ return;
case G_DHCP_CLIENT_EVENT_ADDRESS_CONFLICT:
dhcp_client->address_conflict_cb = func;
dhcp_client->address_conflict_data = data;
diff --git a/gdhcp/gdhcp.h b/gdhcp/gdhcp.h
index 052ab90c..63c395dc 100644
--- a/gdhcp/gdhcp.h
+++ b/gdhcp/gdhcp.h
@@ -45,14 +45,17 @@ typedef enum {
typedef enum {
G_DHCP_CLIENT_EVENT_LEASE_AVAILABLE,
+ G_DHCP_CLIENT_EVENT_IPV4LL_AVAILABLE,
G_DHCP_CLIENT_EVENT_NO_LEASE,
G_DHCP_CLIENT_EVENT_LEASE_LOST,
+ G_DHCP_CLIENT_EVENT_IPV4LL_LOST,
G_DHCP_CLIENT_EVENT_ADDRESS_CONFLICT,
} GDHCPClientEvent;
typedef enum {
G_DHCP_IPV4,
G_DHCP_IPV6,
+ G_DHCP_IPV4LL,
} GDHCPType;
#define G_DHCP_SUBNET 0x01
diff --git a/gdhcp/ipv4ll.c b/gdhcp/ipv4ll.c
new file mode 100644
index 00000000..b35626d1
--- /dev/null
+++ b/gdhcp/ipv4ll.c
@@ -0,0 +1,139 @@
+/*
+ *
+ * IPV4 Local Link library with GLib integration
+ *
+ * Copyright (C) 2009-2010 Aldebaran Robotics. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netpacket/packet.h>
+#include <net/ethernet.h>
+#include <netinet/if_ether.h>
+
+#include <arpa/inet.h>
+
+#include <glib.h>
+#include "ipv4ll.h"
+
+/**
+ * Return a random link local IP
+ */
+uint32_t ipv4ll_random_ip(int seed)
+{
+ unsigned tmp;
+
+ if (seed)
+ srand(seed);
+ else {
+ struct timeval tv;
+ gettimeofday(&tv, NULL);
+ srand(tv.tv_usec);
+ }
+ do {
+ tmp = rand();
+ tmp = tmp & IN_CLASSB_HOST;
+ } while (tmp > (IN_CLASSB_HOST - 0x0200));
+ return ((LINKLOCAL_ADDR + 0x0100) + tmp);
+}
+
+/**
+ * Return a random delay in range of zero to secs*1000
+ */
+guint ipv4ll_random_delay_ms(guint secs)
+{
+ struct timeval tv;
+ guint tmp;
+
+ gettimeofday(&tv, NULL);
+ srand(tv.tv_usec);
+ tmp = rand();
+ return tmp % (secs * 1000);
+}
+
+int ipv4ll_send_arp_packet(uint8_t* source_eth, uint32_t source_ip,
+ uint32_t target_ip, int ifindex)
+{
+ struct sockaddr_ll dest;
+ struct ether_arp p;
+ uint32_t ip_source;
+ uint32_t ip_target;
+ int fd, n;
+
+ fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_ARP));
+ if (fd < 0)
+ return -errno;
+
+ memset(&dest, 0, sizeof(dest));
+ memset(&p, 0, sizeof(p));
+
+ dest.sll_family = AF_PACKET;
+ dest.sll_protocol = htons(ETH_P_ARP);
+ dest.sll_ifindex = ifindex;
+ dest.sll_halen = ETH_ALEN;
+ memset(dest.sll_addr, 0xFF, ETH_ALEN);
+ if (bind(fd, (struct sockaddr *)&dest, sizeof(dest)) < 0) {
+ close(fd);
+ return -errno;
+ }
+
+ ip_source = htonl(source_ip);
+ ip_target = htonl(target_ip);
+ p.arp_hrd = htons(ARPHRD_ETHER);
+ p.arp_pro = htons(ETHERTYPE_IP);
+ p.arp_hln = ETH_ALEN;
+ p.arp_pln = 4;
+ p.arp_op = htons(ARPOP_REQUEST);
+
+ memcpy(&p.arp_sha, source_eth, ETH_ALEN);
+ memcpy(&p.arp_spa, &ip_source, sizeof(p.arp_spa));
+ memcpy(&p.arp_tpa, &ip_target, sizeof(p.arp_tpa));
+
+ n = sendto(fd, &p, sizeof(p), 0,
+ (struct sockaddr*) &dest, sizeof(dest));
+ if (n < 0)
+ return -errno;
+
+ close(fd);
+
+ return n;
+}
+
+int ipv4ll_arp_socket(int ifindex)
+{
+ int fd;
+ struct sockaddr_ll sock;
+ fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_ARP));
+ if (fd < 0)
+ return fd;
+
+ sock.sll_family = AF_PACKET;
+ sock.sll_protocol = htons(ETH_P_ARP);
+ sock.sll_ifindex = ifindex;
+
+ if (bind(fd, (struct sockaddr *) &sock, sizeof(sock)) != 0) {
+ close(fd);
+ return -errno;
+ }
+
+ return fd;
+}
diff --git a/gdhcp/ipv4ll.h b/gdhcp/ipv4ll.h
new file mode 100644
index 00000000..aaac33ed
--- /dev/null
+++ b/gdhcp/ipv4ll.h
@@ -0,0 +1,55 @@
+/*
+ *
+ * IPV4 Local Link library with GLib integration
+ *
+ * Copyright (C) 2009-2010 Aldebaran Robotics. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#ifndef __G_IPV4LL_H
+#define __G_IPV4LL_H
+
+#include <glib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* 169.254.0.0 */
+#define LINKLOCAL_ADDR 0xa9fe0000
+
+/* See RFC 3927 */
+#define PROBE_WAIT 1
+#define PROBE_NUM 3
+#define PROBE_MIN 1
+#define PROBE_MAX 2
+#define ANNOUNCE_WAIT 2
+#define ANNOUNCE_NUM 2
+#define ANNOUNCE_INTERVAL 2
+#define MAX_CONFLICTS 10
+#define RATE_LIMIT_INTERVAL 60
+#define DEFEND_INTERVAL 10
+
+uint32_t ipv4ll_random_ip(int seed);
+guint ipv4ll_random_delay_ms(guint secs);
+int ipv4ll_send_arp_packet(uint8_t* source_eth, uint32_t source_ip,
+ uint32_t target_ip, int ifindex);
+int ipv4ll_arp_socket(int ifindex);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* !IPV4LL_H_ */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 19:14:32 +0000