Nino Der Kinderen / Mbed 2 deprecated InetTest

Embedded C project:18/12/2014

Dependencies:   DS1307 TextLCD mbed

NetServices/lwip/core/dhcp.c@0:8d87bc453349, 2014-12-18 (annotated)

Committer:
ninoderkinderen
Date:
Thu Dec 18 09:35:49 2014 +0000
Revision:
0:8d87bc453349
Programma embedded C

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ninoderkinderen 0:8d87bc453349 1 /**
ninoderkinderen 0:8d87bc453349 2 * @file
ninoderkinderen 0:8d87bc453349 3 * Dynamic Host Configuration Protocol client
ninoderkinderen 0:8d87bc453349 4 *
ninoderkinderen 0:8d87bc453349 5 */
ninoderkinderen 0:8d87bc453349 6
ninoderkinderen 0:8d87bc453349 7 /*
ninoderkinderen 0:8d87bc453349 8 *
ninoderkinderen 0:8d87bc453349 9 * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
ninoderkinderen 0:8d87bc453349 10 * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
ninoderkinderen 0:8d87bc453349 11 * All rights reserved.
ninoderkinderen 0:8d87bc453349 12 *
ninoderkinderen 0:8d87bc453349 13 * Redistribution and use in source and binary forms, with or without modification,
ninoderkinderen 0:8d87bc453349 14 * are permitted provided that the following conditions are met:
ninoderkinderen 0:8d87bc453349 15 *
ninoderkinderen 0:8d87bc453349 16 * 1. Redistributions of source code must retain the above copyright notice,
ninoderkinderen 0:8d87bc453349 17 * this list of conditions and the following disclaimer.
ninoderkinderen 0:8d87bc453349 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
ninoderkinderen 0:8d87bc453349 19 * this list of conditions and the following disclaimer in the documentation
ninoderkinderen 0:8d87bc453349 20 * and/or other materials provided with the distribution.
ninoderkinderen 0:8d87bc453349 21 * 3. The name of the author may not be used to endorse or promote products
ninoderkinderen 0:8d87bc453349 22 * derived from this software without specific prior written permission.
ninoderkinderen 0:8d87bc453349 23 *
ninoderkinderen 0:8d87bc453349 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
ninoderkinderen 0:8d87bc453349 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
ninoderkinderen 0:8d87bc453349 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
ninoderkinderen 0:8d87bc453349 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
ninoderkinderen 0:8d87bc453349 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
ninoderkinderen 0:8d87bc453349 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
ninoderkinderen 0:8d87bc453349 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
ninoderkinderen 0:8d87bc453349 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
ninoderkinderen 0:8d87bc453349 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
ninoderkinderen 0:8d87bc453349 33 * OF SUCH DAMAGE.
ninoderkinderen 0:8d87bc453349 34 *
ninoderkinderen 0:8d87bc453349 35 * This file is a contribution to the lwIP TCP/IP stack.
ninoderkinderen 0:8d87bc453349 36 * The Swedish Institute of Computer Science and Adam Dunkels
ninoderkinderen 0:8d87bc453349 37 * are specifically granted permission to redistribute this
ninoderkinderen 0:8d87bc453349 38 * source code.
ninoderkinderen 0:8d87bc453349 39 *
ninoderkinderen 0:8d87bc453349 40 * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
ninoderkinderen 0:8d87bc453349 41 *
ninoderkinderen 0:8d87bc453349 42 * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
ninoderkinderen 0:8d87bc453349 43 * with RFC 2131 and RFC 2132.
ninoderkinderen 0:8d87bc453349 44 *
ninoderkinderen 0:8d87bc453349 45 * TODO:
ninoderkinderen 0:8d87bc453349 46 * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
ninoderkinderen 0:8d87bc453349 47 *
ninoderkinderen 0:8d87bc453349 48 * Please coordinate changes and requests with Leon Woestenberg
ninoderkinderen 0:8d87bc453349 49 * <leon.woestenberg@gmx.net>
ninoderkinderen 0:8d87bc453349 50 *
ninoderkinderen 0:8d87bc453349 51 * Integration with your code:
ninoderkinderen 0:8d87bc453349 52 *
ninoderkinderen 0:8d87bc453349 53 * In lwip/dhcp.h
ninoderkinderen 0:8d87bc453349 54 * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
ninoderkinderen 0:8d87bc453349 55 * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
ninoderkinderen 0:8d87bc453349 56 *
ninoderkinderen 0:8d87bc453349 57 * Then have your application call dhcp_coarse_tmr() and
ninoderkinderen 0:8d87bc453349 58 * dhcp_fine_tmr() on the defined intervals.
ninoderkinderen 0:8d87bc453349 59 *
ninoderkinderen 0:8d87bc453349 60 * dhcp_start(struct netif *netif);
ninoderkinderen 0:8d87bc453349 61 * starts a DHCP client instance which configures the interface by
ninoderkinderen 0:8d87bc453349 62 * obtaining an IP address lease and maintaining it.
ninoderkinderen 0:8d87bc453349 63 *
ninoderkinderen 0:8d87bc453349 64 * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
ninoderkinderen 0:8d87bc453349 65 * to remove the DHCP client.
ninoderkinderen 0:8d87bc453349 66 *
ninoderkinderen 0:8d87bc453349 67 */
ninoderkinderen 0:8d87bc453349 68
ninoderkinderen 0:8d87bc453349 69 #include "lwip/opt.h"
ninoderkinderen 0:8d87bc453349 70
ninoderkinderen 0:8d87bc453349 71 #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
ninoderkinderen 0:8d87bc453349 72
ninoderkinderen 0:8d87bc453349 73 #include "lwip/stats.h"
ninoderkinderen 0:8d87bc453349 74 #include "lwip/mem.h"
ninoderkinderen 0:8d87bc453349 75 #include "lwip/udp.h"
ninoderkinderen 0:8d87bc453349 76 #include "lwip/ip_addr.h"
ninoderkinderen 0:8d87bc453349 77 #include "lwip/netif.h"
ninoderkinderen 0:8d87bc453349 78 #include "lwip/def.h"
ninoderkinderen 0:8d87bc453349 79 #include "lwip/sys.h"
ninoderkinderen 0:8d87bc453349 80 #include "lwip/dhcp.h"
ninoderkinderen 0:8d87bc453349 81 #include "lwip/autoip.h"
ninoderkinderen 0:8d87bc453349 82 #include "lwip/dns.h"
ninoderkinderen 0:8d87bc453349 83 #include "netif/etharp.h"
ninoderkinderen 0:8d87bc453349 84
ninoderkinderen 0:8d87bc453349 85 #include <string.h>
ninoderkinderen 0:8d87bc453349 86
ninoderkinderen 0:8d87bc453349 87 /** Default for DHCP_GLOBAL_XID is 0xABCD0000
ninoderkinderen 0:8d87bc453349 88 * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
ninoderkinderen 0:8d87bc453349 89 * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
ninoderkinderen 0:8d87bc453349 90 * #define DHCP_GLOBAL_XID rand()
ninoderkinderen 0:8d87bc453349 91 */
ninoderkinderen 0:8d87bc453349 92 #ifdef DHCP_GLOBAL_XID_HEADER
ninoderkinderen 0:8d87bc453349 93 #include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
ninoderkinderen 0:8d87bc453349 94 #endif
ninoderkinderen 0:8d87bc453349 95
ninoderkinderen 0:8d87bc453349 96 /** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
ninoderkinderen 0:8d87bc453349 97 * MTU is checked to be big enough in dhcp_start */
ninoderkinderen 0:8d87bc453349 98 #define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
ninoderkinderen 0:8d87bc453349 99 #define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
ninoderkinderen 0:8d87bc453349 100 /** Minimum length for reply before packet is parsed */
ninoderkinderen 0:8d87bc453349 101 #define DHCP_MIN_REPLY_LEN 44
ninoderkinderen 0:8d87bc453349 102
ninoderkinderen 0:8d87bc453349 103 #define REBOOT_TRIES 2
ninoderkinderen 0:8d87bc453349 104
ninoderkinderen 0:8d87bc453349 105 /** Option handling: options are parsed in dhcp_parse_reply
ninoderkinderen 0:8d87bc453349 106 * and saved in an array where other functions can load them from.
ninoderkinderen 0:8d87bc453349 107 * This might be moved into the struct dhcp (not necessarily since
ninoderkinderen 0:8d87bc453349 108 * lwIP is single-threaded and the array is only used while in recv
ninoderkinderen 0:8d87bc453349 109 * callback). */
ninoderkinderen 0:8d87bc453349 110 #define DHCP_OPTION_IDX_OVERLOAD 0
ninoderkinderen 0:8d87bc453349 111 #define DHCP_OPTION_IDX_MSG_TYPE 1
ninoderkinderen 0:8d87bc453349 112 #define DHCP_OPTION_IDX_SERVER_ID 2
ninoderkinderen 0:8d87bc453349 113 #define DHCP_OPTION_IDX_LEASE_TIME 3
ninoderkinderen 0:8d87bc453349 114 #define DHCP_OPTION_IDX_T1 4
ninoderkinderen 0:8d87bc453349 115 #define DHCP_OPTION_IDX_T2 5
ninoderkinderen 0:8d87bc453349 116 #define DHCP_OPTION_IDX_SUBNET_MASK 6
ninoderkinderen 0:8d87bc453349 117 #define DHCP_OPTION_IDX_ROUTER 7
ninoderkinderen 0:8d87bc453349 118 #define DHCP_OPTION_IDX_DNS_SERVER 8
ninoderkinderen 0:8d87bc453349 119 #define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
ninoderkinderen 0:8d87bc453349 120
ninoderkinderen 0:8d87bc453349 121 /** Holds the decoded option values, only valid while in dhcp_recv.
ninoderkinderen 0:8d87bc453349 122 @todo: move this into struct dhcp? */
ninoderkinderen 0:8d87bc453349 123 u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
ninoderkinderen 0:8d87bc453349 124 /** Holds a flag which option was received and is contained in dhcp_rx_options_val,
ninoderkinderen 0:8d87bc453349 125 only valid while in dhcp_recv.
ninoderkinderen 0:8d87bc453349 126 @todo: move this into struct dhcp? */
ninoderkinderen 0:8d87bc453349 127 u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
ninoderkinderen 0:8d87bc453349 128
ninoderkinderen 0:8d87bc453349 129 #define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
ninoderkinderen 0:8d87bc453349 130 #define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
ninoderkinderen 0:8d87bc453349 131 #define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
ninoderkinderen 0:8d87bc453349 132 #define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
ninoderkinderen 0:8d87bc453349 133 #define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
ninoderkinderen 0:8d87bc453349 134 #define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
ninoderkinderen 0:8d87bc453349 135
ninoderkinderen 0:8d87bc453349 136
ninoderkinderen 0:8d87bc453349 137 /* DHCP client state machine functions */
ninoderkinderen 0:8d87bc453349 138 static err_t dhcp_discover(struct netif *netif);
ninoderkinderen 0:8d87bc453349 139 static err_t dhcp_select(struct netif *netif);
ninoderkinderen 0:8d87bc453349 140 static void dhcp_bind(struct netif *netif);
ninoderkinderen 0:8d87bc453349 141 #if DHCP_DOES_ARP_CHECK
ninoderkinderen 0:8d87bc453349 142 static err_t dhcp_decline(struct netif *netif);
ninoderkinderen 0:8d87bc453349 143 #endif /* DHCP_DOES_ARP_CHECK */
ninoderkinderen 0:8d87bc453349 144 static err_t dhcp_rebind(struct netif *netif);
ninoderkinderen 0:8d87bc453349 145 static err_t dhcp_reboot(struct netif *netif);
ninoderkinderen 0:8d87bc453349 146 static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
ninoderkinderen 0:8d87bc453349 147
ninoderkinderen 0:8d87bc453349 148 /* receive, unfold, parse and free incoming messages */
ninoderkinderen 0:8d87bc453349 149 static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
ninoderkinderen 0:8d87bc453349 150
ninoderkinderen 0:8d87bc453349 151 /* set the DHCP timers */
ninoderkinderen 0:8d87bc453349 152 static void dhcp_timeout(struct netif *netif);
ninoderkinderen 0:8d87bc453349 153 static void dhcp_t1_timeout(struct netif *netif);
ninoderkinderen 0:8d87bc453349 154 static void dhcp_t2_timeout(struct netif *netif);
ninoderkinderen 0:8d87bc453349 155
ninoderkinderen 0:8d87bc453349 156 /* build outgoing messages */
ninoderkinderen 0:8d87bc453349 157 /* create a DHCP message, fill in common headers */
ninoderkinderen 0:8d87bc453349 158 static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
ninoderkinderen 0:8d87bc453349 159 /* free a DHCP request */
ninoderkinderen 0:8d87bc453349 160 static void dhcp_delete_msg(struct dhcp *dhcp);
ninoderkinderen 0:8d87bc453349 161 /* add a DHCP option (type, then length in bytes) */
ninoderkinderen 0:8d87bc453349 162 static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
ninoderkinderen 0:8d87bc453349 163 /* add option values */
ninoderkinderen 0:8d87bc453349 164 static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
ninoderkinderen 0:8d87bc453349 165 static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
ninoderkinderen 0:8d87bc453349 166 static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
ninoderkinderen 0:8d87bc453349 167 /* always add the DHCP options trailer to end and pad */
ninoderkinderen 0:8d87bc453349 168 static void dhcp_option_trailer(struct dhcp *dhcp);
ninoderkinderen 0:8d87bc453349 169
ninoderkinderen 0:8d87bc453349 170 /**
ninoderkinderen 0:8d87bc453349 171 * Back-off the DHCP client (because of a received NAK response).
ninoderkinderen 0:8d87bc453349 172 *
ninoderkinderen 0:8d87bc453349 173 * Back-off the DHCP client because of a received NAK. Receiving a
ninoderkinderen 0:8d87bc453349 174 * NAK means the client asked for something non-sensible, for
ninoderkinderen 0:8d87bc453349 175 * example when it tries to renew a lease obtained on another network.
ninoderkinderen 0:8d87bc453349 176 *
ninoderkinderen 0:8d87bc453349 177 * We clear any existing set IP address and restart DHCP negotiation
ninoderkinderen 0:8d87bc453349 178 * afresh (as per RFC2131 3.2.3).
ninoderkinderen 0:8d87bc453349 179 *
ninoderkinderen 0:8d87bc453349 180 * @param netif the netif under DHCP control
ninoderkinderen 0:8d87bc453349 181 */
ninoderkinderen 0:8d87bc453349 182 static void
ninoderkinderen 0:8d87bc453349 183 dhcp_handle_nak(struct netif *netif)
ninoderkinderen 0:8d87bc453349 184 {
ninoderkinderen 0:8d87bc453349 185 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
ninoderkinderen 0:8d87bc453349 187 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
ninoderkinderen 0:8d87bc453349 188 /* Set the interface down since the address must no longer be used, as per RFC2131 */
ninoderkinderen 0:8d87bc453349 189 netif_set_down(netif);
ninoderkinderen 0:8d87bc453349 190 /* remove IP address from interface */
ninoderkinderen 0:8d87bc453349 191 netif_set_ipaddr(netif, IP_ADDR_ANY);
ninoderkinderen 0:8d87bc453349 192 netif_set_gw(netif, IP_ADDR_ANY);
ninoderkinderen 0:8d87bc453349 193 netif_set_netmask(netif, IP_ADDR_ANY);
ninoderkinderen 0:8d87bc453349 194 /* Change to a defined state */
ninoderkinderen 0:8d87bc453349 195 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
ninoderkinderen 0:8d87bc453349 196 /* We can immediately restart discovery */
ninoderkinderen 0:8d87bc453349 197 dhcp_discover(netif);
ninoderkinderen 0:8d87bc453349 198 }
ninoderkinderen 0:8d87bc453349 199
ninoderkinderen 0:8d87bc453349 200 #if DHCP_DOES_ARP_CHECK
ninoderkinderen 0:8d87bc453349 201 /**
ninoderkinderen 0:8d87bc453349 202 * Checks if the offered IP address is already in use.
ninoderkinderen 0:8d87bc453349 203 *
ninoderkinderen 0:8d87bc453349 204 * It does so by sending an ARP request for the offered address and
ninoderkinderen 0:8d87bc453349 205 * entering CHECKING state. If no ARP reply is received within a small
ninoderkinderen 0:8d87bc453349 206 * interval, the address is assumed to be free for use by us.
ninoderkinderen 0:8d87bc453349 207 *
ninoderkinderen 0:8d87bc453349 208 * @param netif the netif under DHCP control
ninoderkinderen 0:8d87bc453349 209 */
ninoderkinderen 0:8d87bc453349 210 static void
ninoderkinderen 0:8d87bc453349 211 dhcp_check(struct netif *netif)
ninoderkinderen 0:8d87bc453349 212 {
ninoderkinderen 0:8d87bc453349 213 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 214 err_t result;
ninoderkinderen 0:8d87bc453349 215 u16_t msecs;
ninoderkinderen 0:8d87bc453349 216 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
ninoderkinderen 0:8d87bc453349 217 (s16_t)netif->name[1]));
ninoderkinderen 0:8d87bc453349 218 dhcp_set_state(dhcp, DHCP_CHECKING);
ninoderkinderen 0:8d87bc453349 219 /* create an ARP query for the offered IP address, expecting that no host
ninoderkinderen 0:8d87bc453349 220 responds, as the IP address should not be in use. */
ninoderkinderen 0:8d87bc453349 221 result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
ninoderkinderen 0:8d87bc453349 222 if (result != ERR_OK) {
ninoderkinderen 0:8d87bc453349 223 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
ninoderkinderen 0:8d87bc453349 224 }
ninoderkinderen 0:8d87bc453349 225 dhcp->tries++;
ninoderkinderen 0:8d87bc453349 226 msecs = 500;
ninoderkinderen 0:8d87bc453349 227 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ninoderkinderen 0:8d87bc453349 228 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
ninoderkinderen 0:8d87bc453349 229 }
ninoderkinderen 0:8d87bc453349 230 #endif /* DHCP_DOES_ARP_CHECK */
ninoderkinderen 0:8d87bc453349 231
ninoderkinderen 0:8d87bc453349 232 /**
ninoderkinderen 0:8d87bc453349 233 * Remember the configuration offered by a DHCP server.
ninoderkinderen 0:8d87bc453349 234 *
ninoderkinderen 0:8d87bc453349 235 * @param netif the netif under DHCP control
ninoderkinderen 0:8d87bc453349 236 */
ninoderkinderen 0:8d87bc453349 237 static void
ninoderkinderen 0:8d87bc453349 238 dhcp_handle_offer(struct netif *netif)
ninoderkinderen 0:8d87bc453349 239 {
ninoderkinderen 0:8d87bc453349 240 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 241 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
ninoderkinderen 0:8d87bc453349 242 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
ninoderkinderen 0:8d87bc453349 243 /* obtain the server address */
ninoderkinderen 0:8d87bc453349 244 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
ninoderkinderen 0:8d87bc453349 245 ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
ninoderkinderen 0:8d87bc453349 246 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
ninoderkinderen 0:8d87bc453349 247 ip4_addr_get_u32(&dhcp->server_ip_addr)));
ninoderkinderen 0:8d87bc453349 248 /* remember offered address */
ninoderkinderen 0:8d87bc453349 249 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
ninoderkinderen 0:8d87bc453349 250 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
ninoderkinderen 0:8d87bc453349 251 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
ninoderkinderen 0:8d87bc453349 252
ninoderkinderen 0:8d87bc453349 253 dhcp_select(netif);
ninoderkinderen 0:8d87bc453349 254 } else {
ninoderkinderen 0:8d87bc453349 255 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
ninoderkinderen 0:8d87bc453349 256 ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
ninoderkinderen 0:8d87bc453349 257 }
ninoderkinderen 0:8d87bc453349 258 }
ninoderkinderen 0:8d87bc453349 259
ninoderkinderen 0:8d87bc453349 260 /**
ninoderkinderen 0:8d87bc453349 261 * Select a DHCP server offer out of all offers.
ninoderkinderen 0:8d87bc453349 262 *
ninoderkinderen 0:8d87bc453349 263 * Simply select the first offer received.
ninoderkinderen 0:8d87bc453349 264 *
ninoderkinderen 0:8d87bc453349 265 * @param netif the netif under DHCP control
ninoderkinderen 0:8d87bc453349 266 * @return lwIP specific error (see error.h)
ninoderkinderen 0:8d87bc453349 267 */
ninoderkinderen 0:8d87bc453349 268 static err_t
ninoderkinderen 0:8d87bc453349 269 dhcp_select(struct netif *netif)
ninoderkinderen 0:8d87bc453349 270 {
ninoderkinderen 0:8d87bc453349 271 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 272 err_t result;
ninoderkinderen 0:8d87bc453349 273 u16_t msecs;
ninoderkinderen 0:8d87bc453349 274
ninoderkinderen 0:8d87bc453349 275 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_select(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
ninoderkinderen 0:8d87bc453349 276 dhcp_set_state(dhcp, DHCP_REQUESTING);
ninoderkinderen 0:8d87bc453349 277
ninoderkinderen 0:8d87bc453349 278 /* create and initialize the DHCP message header */
ninoderkinderen 0:8d87bc453349 279 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
ninoderkinderen 0:8d87bc453349 280 if (result == ERR_OK) {
ninoderkinderen 0:8d87bc453349 281 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
ninoderkinderen 0:8d87bc453349 282 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
ninoderkinderen 0:8d87bc453349 283
ninoderkinderen 0:8d87bc453349 284 /* MUST request the offered IP address */
ninoderkinderen 0:8d87bc453349 285 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
ninoderkinderen 0:8d87bc453349 286 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
ninoderkinderen 0:8d87bc453349 287
ninoderkinderen 0:8d87bc453349 288 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
ninoderkinderen 0:8d87bc453349 289 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
ninoderkinderen 0:8d87bc453349 290
ninoderkinderen 0:8d87bc453349 291 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
ninoderkinderen 0:8d87bc453349 292 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
ninoderkinderen 0:8d87bc453349 293 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
ninoderkinderen 0:8d87bc453349 294 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
ninoderkinderen 0:8d87bc453349 295 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
ninoderkinderen 0:8d87bc453349 296
ninoderkinderen 0:8d87bc453349 297 #if LWIP_NETIF_HOSTNAME
ninoderkinderen 0:8d87bc453349 298 if (netif->hostname != NULL) {
ninoderkinderen 0:8d87bc453349 299 const char *p = (const char*)netif->hostname;
ninoderkinderen 0:8d87bc453349 300 u8_t namelen = (u8_t)strlen(p);
ninoderkinderen 0:8d87bc453349 301 if (namelen > 0) {
ninoderkinderen 0:8d87bc453349 302 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
ninoderkinderen 0:8d87bc453349 303 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
ninoderkinderen 0:8d87bc453349 304 while (*p) {
ninoderkinderen 0:8d87bc453349 305 dhcp_option_byte(dhcp, *p++);
ninoderkinderen 0:8d87bc453349 306 }
ninoderkinderen 0:8d87bc453349 307 }
ninoderkinderen 0:8d87bc453349 308 }
ninoderkinderen 0:8d87bc453349 309 #endif /* LWIP_NETIF_HOSTNAME */
ninoderkinderen 0:8d87bc453349 310
ninoderkinderen 0:8d87bc453349 311 dhcp_option_trailer(dhcp);
ninoderkinderen 0:8d87bc453349 312 /* shrink the pbuf to the actual content length */
ninoderkinderen 0:8d87bc453349 313 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ninoderkinderen 0:8d87bc453349 314
ninoderkinderen 0:8d87bc453349 315 /* send broadcast to any DHCP server */
ninoderkinderen 0:8d87bc453349 316 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
ninoderkinderen 0:8d87bc453349 317 dhcp_delete_msg(dhcp);
ninoderkinderen 0:8d87bc453349 318 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
ninoderkinderen 0:8d87bc453349 319 } else {
ninoderkinderen 0:8d87bc453349 320 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
ninoderkinderen 0:8d87bc453349 321 }
ninoderkinderen 0:8d87bc453349 322 dhcp->tries++;
ninoderkinderen 0:8d87bc453349 323 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
ninoderkinderen 0:8d87bc453349 324 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ninoderkinderen 0:8d87bc453349 325 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
ninoderkinderen 0:8d87bc453349 326 return result;
ninoderkinderen 0:8d87bc453349 327 }
ninoderkinderen 0:8d87bc453349 328
ninoderkinderen 0:8d87bc453349 329 /**
ninoderkinderen 0:8d87bc453349 330 * The DHCP timer that checks for lease renewal/rebind timeouts.
ninoderkinderen 0:8d87bc453349 331 */
ninoderkinderen 0:8d87bc453349 332 void
ninoderkinderen 0:8d87bc453349 333 dhcp_coarse_tmr()
ninoderkinderen 0:8d87bc453349 334 {
ninoderkinderen 0:8d87bc453349 335 struct netif *netif = netif_list;
ninoderkinderen 0:8d87bc453349 336 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
ninoderkinderen 0:8d87bc453349 337 /* iterate through all network interfaces */
ninoderkinderen 0:8d87bc453349 338 while (netif != NULL) {
ninoderkinderen 0:8d87bc453349 339 /* only act on DHCP configured interfaces */
ninoderkinderen 0:8d87bc453349 340 if (netif->dhcp != NULL) {
ninoderkinderen 0:8d87bc453349 341 /* timer is active (non zero), and triggers (zeroes) now? */
ninoderkinderen 0:8d87bc453349 342 if (netif->dhcp->t2_timeout-- == 1) {
ninoderkinderen 0:8d87bc453349 343 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
ninoderkinderen 0:8d87bc453349 344 /* this clients' rebind timeout triggered */
ninoderkinderen 0:8d87bc453349 345 dhcp_t2_timeout(netif);
ninoderkinderen 0:8d87bc453349 346 /* timer is active (non zero), and triggers (zeroes) now */
ninoderkinderen 0:8d87bc453349 347 } else if (netif->dhcp->t1_timeout-- == 1) {
ninoderkinderen 0:8d87bc453349 348 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
ninoderkinderen 0:8d87bc453349 349 /* this clients' renewal timeout triggered */
ninoderkinderen 0:8d87bc453349 350 dhcp_t1_timeout(netif);
ninoderkinderen 0:8d87bc453349 351 }
ninoderkinderen 0:8d87bc453349 352 }
ninoderkinderen 0:8d87bc453349 353 /* proceed to next netif */
ninoderkinderen 0:8d87bc453349 354 netif = netif->next;
ninoderkinderen 0:8d87bc453349 355 }
ninoderkinderen 0:8d87bc453349 356 }
ninoderkinderen 0:8d87bc453349 357
ninoderkinderen 0:8d87bc453349 358 /**
ninoderkinderen 0:8d87bc453349 359 * DHCP transaction timeout handling
ninoderkinderen 0:8d87bc453349 360 *
ninoderkinderen 0:8d87bc453349 361 * A DHCP server is expected to respond within a short period of time.
ninoderkinderen 0:8d87bc453349 362 * This timer checks whether an outstanding DHCP request is timed out.
ninoderkinderen 0:8d87bc453349 363 */
ninoderkinderen 0:8d87bc453349 364 void
ninoderkinderen 0:8d87bc453349 365 dhcp_fine_tmr()
ninoderkinderen 0:8d87bc453349 366 {
ninoderkinderen 0:8d87bc453349 367 struct netif *netif = netif_list;
ninoderkinderen 0:8d87bc453349 368 /* loop through netif's */
ninoderkinderen 0:8d87bc453349 369 while (netif != NULL) {
ninoderkinderen 0:8d87bc453349 370 /* only act on DHCP configured interfaces */
ninoderkinderen 0:8d87bc453349 371 if (netif->dhcp != NULL) {
ninoderkinderen 0:8d87bc453349 372 /* timer is active (non zero), and is about to trigger now */
ninoderkinderen 0:8d87bc453349 373 if (netif->dhcp->request_timeout > 1) {
ninoderkinderen 0:8d87bc453349 374 netif->dhcp->request_timeout--;
ninoderkinderen 0:8d87bc453349 375 }
ninoderkinderen 0:8d87bc453349 376 else if (netif->dhcp->request_timeout == 1) {
ninoderkinderen 0:8d87bc453349 377 netif->dhcp->request_timeout--;
ninoderkinderen 0:8d87bc453349 378 /* { netif->dhcp->request_timeout == 0 } */
ninoderkinderen 0:8d87bc453349 379 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
ninoderkinderen 0:8d87bc453349 380 /* this client's request timeout triggered */
ninoderkinderen 0:8d87bc453349 381 dhcp_timeout(netif);
ninoderkinderen 0:8d87bc453349 382 }
ninoderkinderen 0:8d87bc453349 383 }
ninoderkinderen 0:8d87bc453349 384 /* proceed to next network interface */
ninoderkinderen 0:8d87bc453349 385 netif = netif->next;
ninoderkinderen 0:8d87bc453349 386 }
ninoderkinderen 0:8d87bc453349 387 }
ninoderkinderen 0:8d87bc453349 388
ninoderkinderen 0:8d87bc453349 389 /**
ninoderkinderen 0:8d87bc453349 390 * A DHCP negotiation transaction, or ARP request, has timed out.
ninoderkinderen 0:8d87bc453349 391 *
ninoderkinderen 0:8d87bc453349 392 * The timer that was started with the DHCP or ARP request has
ninoderkinderen 0:8d87bc453349 393 * timed out, indicating no response was received in time.
ninoderkinderen 0:8d87bc453349 394 *
ninoderkinderen 0:8d87bc453349 395 * @param netif the netif under DHCP control
ninoderkinderen 0:8d87bc453349 396 */
ninoderkinderen 0:8d87bc453349 397 static void
ninoderkinderen 0:8d87bc453349 398 dhcp_timeout(struct netif *netif)
ninoderkinderen 0:8d87bc453349 399 {
ninoderkinderen 0:8d87bc453349 400 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 401 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
ninoderkinderen 0:8d87bc453349 402 /* back-off period has passed, or server selection timed out */
ninoderkinderen 0:8d87bc453349 403 if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
ninoderkinderen 0:8d87bc453349 404 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
ninoderkinderen 0:8d87bc453349 405 dhcp_discover(netif);
ninoderkinderen 0:8d87bc453349 406 /* receiving the requested lease timed out */
ninoderkinderen 0:8d87bc453349 407 } else if (dhcp->state == DHCP_REQUESTING) {
ninoderkinderen 0:8d87bc453349 408 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
ninoderkinderen 0:8d87bc453349 409 if (dhcp->tries <= 5) {
ninoderkinderen 0:8d87bc453349 410 dhcp_select(netif);
ninoderkinderen 0:8d87bc453349 411 } else {
ninoderkinderen 0:8d87bc453349 412 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
ninoderkinderen 0:8d87bc453349 413 dhcp_release(netif);
ninoderkinderen 0:8d87bc453349 414 dhcp_discover(netif);
ninoderkinderen 0:8d87bc453349 415 }
ninoderkinderen 0:8d87bc453349 416 #if DHCP_DOES_ARP_CHECK
ninoderkinderen 0:8d87bc453349 417 /* received no ARP reply for the offered address (which is good) */
ninoderkinderen 0:8d87bc453349 418 } else if (dhcp->state == DHCP_CHECKING) {
ninoderkinderen 0:8d87bc453349 419 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
ninoderkinderen 0:8d87bc453349 420 if (dhcp->tries <= 1) {
ninoderkinderen 0:8d87bc453349 421 dhcp_check(netif);
ninoderkinderen 0:8d87bc453349 422 /* no ARP replies on the offered address,
ninoderkinderen 0:8d87bc453349 423 looks like the IP address is indeed free */
ninoderkinderen 0:8d87bc453349 424 } else {
ninoderkinderen 0:8d87bc453349 425 /* bind the interface to the offered address */
ninoderkinderen 0:8d87bc453349 426 dhcp_bind(netif);
ninoderkinderen 0:8d87bc453349 427 }
ninoderkinderen 0:8d87bc453349 428 #endif /* DHCP_DOES_ARP_CHECK */
ninoderkinderen 0:8d87bc453349 429 }
ninoderkinderen 0:8d87bc453349 430 /* did not get response to renew request? */
ninoderkinderen 0:8d87bc453349 431 else if (dhcp->state == DHCP_RENEWING) {
ninoderkinderen 0:8d87bc453349 432 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
ninoderkinderen 0:8d87bc453349 433 /* just retry renewal */
ninoderkinderen 0:8d87bc453349 434 /* note that the rebind timer will eventually time-out if renew does not work */
ninoderkinderen 0:8d87bc453349 435 dhcp_renew(netif);
ninoderkinderen 0:8d87bc453349 436 /* did not get response to rebind request? */
ninoderkinderen 0:8d87bc453349 437 } else if (dhcp->state == DHCP_REBINDING) {
ninoderkinderen 0:8d87bc453349 438 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
ninoderkinderen 0:8d87bc453349 439 if (dhcp->tries <= 8) {
ninoderkinderen 0:8d87bc453349 440 dhcp_rebind(netif);
ninoderkinderen 0:8d87bc453349 441 } else {
ninoderkinderen 0:8d87bc453349 442 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
ninoderkinderen 0:8d87bc453349 443 dhcp_release(netif);
ninoderkinderen 0:8d87bc453349 444 dhcp_discover(netif);
ninoderkinderen 0:8d87bc453349 445 }
ninoderkinderen 0:8d87bc453349 446 } else if (dhcp->state == DHCP_REBOOTING) {
ninoderkinderen 0:8d87bc453349 447 if (dhcp->tries < REBOOT_TRIES) {
ninoderkinderen 0:8d87bc453349 448 dhcp_reboot(netif);
ninoderkinderen 0:8d87bc453349 449 } else {
ninoderkinderen 0:8d87bc453349 450 dhcp_discover(netif);
ninoderkinderen 0:8d87bc453349 451 }
ninoderkinderen 0:8d87bc453349 452 }
ninoderkinderen 0:8d87bc453349 453 }
ninoderkinderen 0:8d87bc453349 454
ninoderkinderen 0:8d87bc453349 455 /**
ninoderkinderen 0:8d87bc453349 456 * The renewal period has timed out.
ninoderkinderen 0:8d87bc453349 457 *
ninoderkinderen 0:8d87bc453349 458 * @param netif the netif under DHCP control
ninoderkinderen 0:8d87bc453349 459 */
ninoderkinderen 0:8d87bc453349 460 static void
ninoderkinderen 0:8d87bc453349 461 dhcp_t1_timeout(struct netif *netif)
ninoderkinderen 0:8d87bc453349 462 {
ninoderkinderen 0:8d87bc453349 463 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
ninoderkinderen 0:8d87bc453349 465 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
ninoderkinderen 0:8d87bc453349 466 (dhcp->state == DHCP_RENEWING)) {
ninoderkinderen 0:8d87bc453349 467 /* just retry to renew - note that the rebind timer (t2) will
ninoderkinderen 0:8d87bc453349 468 * eventually time-out if renew tries fail. */
ninoderkinderen 0:8d87bc453349 469 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
ninoderkinderen 0:8d87bc453349 470 ("dhcp_t1_timeout(): must renew\n"));
ninoderkinderen 0:8d87bc453349 471 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
ninoderkinderen 0:8d87bc453349 472 DHCP_RENEWING, not DHCP_BOUND */
ninoderkinderen 0:8d87bc453349 473 dhcp_renew(netif);
ninoderkinderen 0:8d87bc453349 474 }
ninoderkinderen 0:8d87bc453349 475 }
ninoderkinderen 0:8d87bc453349 476
ninoderkinderen 0:8d87bc453349 477 /**
ninoderkinderen 0:8d87bc453349 478 * The rebind period has timed out.
ninoderkinderen 0:8d87bc453349 479 *
ninoderkinderen 0:8d87bc453349 480 * @param netif the netif under DHCP control
ninoderkinderen 0:8d87bc453349 481 */
ninoderkinderen 0:8d87bc453349 482 static void
ninoderkinderen 0:8d87bc453349 483 dhcp_t2_timeout(struct netif *netif)
ninoderkinderen 0:8d87bc453349 484 {
ninoderkinderen 0:8d87bc453349 485 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 486 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
ninoderkinderen 0:8d87bc453349 487 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
ninoderkinderen 0:8d87bc453349 488 (dhcp->state == DHCP_RENEWING)) {
ninoderkinderen 0:8d87bc453349 489 /* just retry to rebind */
ninoderkinderen 0:8d87bc453349 490 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
ninoderkinderen 0:8d87bc453349 491 ("dhcp_t2_timeout(): must rebind\n"));
ninoderkinderen 0:8d87bc453349 492 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
ninoderkinderen 0:8d87bc453349 493 DHCP_REBINDING, not DHCP_BOUND */
ninoderkinderen 0:8d87bc453349 494 dhcp_rebind(netif);
ninoderkinderen 0:8d87bc453349 495 }
ninoderkinderen 0:8d87bc453349 496 }
ninoderkinderen 0:8d87bc453349 497
ninoderkinderen 0:8d87bc453349 498 /**
ninoderkinderen 0:8d87bc453349 499 * Handle a DHCP ACK packet
ninoderkinderen 0:8d87bc453349 500 *
ninoderkinderen 0:8d87bc453349 501 * @param netif the netif under DHCP control
ninoderkinderen 0:8d87bc453349 502 */
ninoderkinderen 0:8d87bc453349 503 static void
ninoderkinderen 0:8d87bc453349 504 dhcp_handle_ack(struct netif *netif)
ninoderkinderen 0:8d87bc453349 505 {
ninoderkinderen 0:8d87bc453349 506 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 507 #if LWIP_DNS
ninoderkinderen 0:8d87bc453349 508 u8_t n;
ninoderkinderen 0:8d87bc453349 509 #endif /* LWIP_DNS */
ninoderkinderen 0:8d87bc453349 510
ninoderkinderen 0:8d87bc453349 511 /* clear options we might not get from the ACK */
ninoderkinderen 0:8d87bc453349 512 ip_addr_set_zero(&dhcp->offered_sn_mask);
ninoderkinderen 0:8d87bc453349 513 ip_addr_set_zero(&dhcp->offered_gw_addr);
ninoderkinderen 0:8d87bc453349 514 #if LWIP_DHCP_BOOTP_FILE
ninoderkinderen 0:8d87bc453349 515 ip_addr_set_zero(&dhcp->offered_si_addr);
ninoderkinderen 0:8d87bc453349 516 #endif /* LWIP_DHCP_BOOTP_FILE */
ninoderkinderen 0:8d87bc453349 517
ninoderkinderen 0:8d87bc453349 518 /* lease time given? */
ninoderkinderen 0:8d87bc453349 519 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
ninoderkinderen 0:8d87bc453349 520 /* remember offered lease time */
ninoderkinderen 0:8d87bc453349 521 dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
ninoderkinderen 0:8d87bc453349 522 }
ninoderkinderen 0:8d87bc453349 523 /* renewal period given? */
ninoderkinderen 0:8d87bc453349 524 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
ninoderkinderen 0:8d87bc453349 525 /* remember given renewal period */
ninoderkinderen 0:8d87bc453349 526 dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
ninoderkinderen 0:8d87bc453349 527 } else {
ninoderkinderen 0:8d87bc453349 528 /* calculate safe periods for renewal */
ninoderkinderen 0:8d87bc453349 529 dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
ninoderkinderen 0:8d87bc453349 530 }
ninoderkinderen 0:8d87bc453349 531
ninoderkinderen 0:8d87bc453349 532 /* renewal period given? */
ninoderkinderen 0:8d87bc453349 533 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
ninoderkinderen 0:8d87bc453349 534 /* remember given rebind period */
ninoderkinderen 0:8d87bc453349 535 dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
ninoderkinderen 0:8d87bc453349 536 } else {
ninoderkinderen 0:8d87bc453349 537 /* calculate safe periods for rebinding */
ninoderkinderen 0:8d87bc453349 538 dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
ninoderkinderen 0:8d87bc453349 539 }
ninoderkinderen 0:8d87bc453349 540
ninoderkinderen 0:8d87bc453349 541 /* (y)our internet address */
ninoderkinderen 0:8d87bc453349 542 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
ninoderkinderen 0:8d87bc453349 543
ninoderkinderen 0:8d87bc453349 544 #if LWIP_DHCP_BOOTP_FILE
ninoderkinderen 0:8d87bc453349 545 /* copy boot server address,
ninoderkinderen 0:8d87bc453349 546 boot file name copied in dhcp_parse_reply if not overloaded */
ninoderkinderen 0:8d87bc453349 547 ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
ninoderkinderen 0:8d87bc453349 548 #endif /* LWIP_DHCP_BOOTP_FILE */
ninoderkinderen 0:8d87bc453349 549
ninoderkinderen 0:8d87bc453349 550 /* subnet mask given? */
ninoderkinderen 0:8d87bc453349 551 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
ninoderkinderen 0:8d87bc453349 552 /* remember given subnet mask */
ninoderkinderen 0:8d87bc453349 553 ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
ninoderkinderen 0:8d87bc453349 554 dhcp->subnet_mask_given = 1;
ninoderkinderen 0:8d87bc453349 555 } else {
ninoderkinderen 0:8d87bc453349 556 dhcp->subnet_mask_given = 0;
ninoderkinderen 0:8d87bc453349 557 }
ninoderkinderen 0:8d87bc453349 558
ninoderkinderen 0:8d87bc453349 559 /* gateway router */
ninoderkinderen 0:8d87bc453349 560 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
ninoderkinderen 0:8d87bc453349 561 ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
ninoderkinderen 0:8d87bc453349 562 }
ninoderkinderen 0:8d87bc453349 563
ninoderkinderen 0:8d87bc453349 564 #if LWIP_DNS
ninoderkinderen 0:8d87bc453349 565 /* DNS servers */
ninoderkinderen 0:8d87bc453349 566 n = 0;
ninoderkinderen 0:8d87bc453349 567 while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
ninoderkinderen 0:8d87bc453349 568 ip_addr_t dns_addr;
ninoderkinderen 0:8d87bc453349 569 ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
ninoderkinderen 0:8d87bc453349 570 dns_setserver(n, &dns_addr);
ninoderkinderen 0:8d87bc453349 571 n++;
ninoderkinderen 0:8d87bc453349 572 }
ninoderkinderen 0:8d87bc453349 573 #endif /* LWIP_DNS */
ninoderkinderen 0:8d87bc453349 574 }
ninoderkinderen 0:8d87bc453349 575
ninoderkinderen 0:8d87bc453349 576 /** Set a statically allocated struct dhcp to work with.
ninoderkinderen 0:8d87bc453349 577 * Using this prevents dhcp_start to allocate it using mem_malloc.
ninoderkinderen 0:8d87bc453349 578 *
ninoderkinderen 0:8d87bc453349 579 * @param netif the netif for which to set the struct dhcp
ninoderkinderen 0:8d87bc453349 580 * @param dhcp (uninitialised) dhcp struct allocated by the application
ninoderkinderen 0:8d87bc453349 581 */
ninoderkinderen 0:8d87bc453349 582 void
ninoderkinderen 0:8d87bc453349 583 dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
ninoderkinderen 0:8d87bc453349 584 {
ninoderkinderen 0:8d87bc453349 585 LWIP_ASSERT("netif != NULL", netif != NULL);
ninoderkinderen 0:8d87bc453349 586 LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
ninoderkinderen 0:8d87bc453349 587 LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
ninoderkinderen 0:8d87bc453349 588
ninoderkinderen 0:8d87bc453349 589 /* clear data structure */
ninoderkinderen 0:8d87bc453349 590 memset(dhcp, 0, sizeof(struct dhcp));
ninoderkinderen 0:8d87bc453349 591 /* dhcp_set_state(&dhcp, DHCP_OFF); */
ninoderkinderen 0:8d87bc453349 592 netif->dhcp = dhcp;
ninoderkinderen 0:8d87bc453349 593 }
ninoderkinderen 0:8d87bc453349 594
ninoderkinderen 0:8d87bc453349 595 /**
ninoderkinderen 0:8d87bc453349 596 * Start DHCP negotiation for a network interface.
ninoderkinderen 0:8d87bc453349 597 *
ninoderkinderen 0:8d87bc453349 598 * If no DHCP client instance was attached to this interface,
ninoderkinderen 0:8d87bc453349 599 * a new client is created first. If a DHCP client instance
ninoderkinderen 0:8d87bc453349 600 * was already present, it restarts negotiation.
ninoderkinderen 0:8d87bc453349 601 *
ninoderkinderen 0:8d87bc453349 602 * @param netif The lwIP network interface
ninoderkinderen 0:8d87bc453349 603 * @return lwIP error code
ninoderkinderen 0:8d87bc453349 604 * - ERR_OK - No error
ninoderkinderen 0:8d87bc453349 605 * - ERR_MEM - Out of memory
ninoderkinderen 0:8d87bc453349 606 */
ninoderkinderen 0:8d87bc453349 607 err_t
ninoderkinderen 0:8d87bc453349 608 dhcp_start(struct netif *netif)
ninoderkinderen 0:8d87bc453349 609 {
ninoderkinderen 0:8d87bc453349 610 struct dhcp *dhcp;
ninoderkinderen 0:8d87bc453349 611 err_t result = ERR_OK;
ninoderkinderen 0:8d87bc453349 612
ninoderkinderen 0:8d87bc453349 613 LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
ninoderkinderen 0:8d87bc453349 614 dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 615 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
ninoderkinderen 0:8d87bc453349 616 /* Remove the flag that says this netif is handled by DHCP,
ninoderkinderen 0:8d87bc453349 617 it is set when we succeeded starting. */
ninoderkinderen 0:8d87bc453349 618 netif->flags &= ~NETIF_FLAG_DHCP;
ninoderkinderen 0:8d87bc453349 619
ninoderkinderen 0:8d87bc453349 620 /* check hwtype of the netif */
ninoderkinderen 0:8d87bc453349 621 if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
ninoderkinderen 0:8d87bc453349 622 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
ninoderkinderen 0:8d87bc453349 623 return ERR_ARG;
ninoderkinderen 0:8d87bc453349 624 }
ninoderkinderen 0:8d87bc453349 625
ninoderkinderen 0:8d87bc453349 626 /* check MTU of the netif */
ninoderkinderen 0:8d87bc453349 627 if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
ninoderkinderen 0:8d87bc453349 628 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
ninoderkinderen 0:8d87bc453349 629 return ERR_MEM;
ninoderkinderen 0:8d87bc453349 630 }
ninoderkinderen 0:8d87bc453349 631
ninoderkinderen 0:8d87bc453349 632 /* no DHCP client attached yet? */
ninoderkinderen 0:8d87bc453349 633 if (dhcp == NULL) {
ninoderkinderen 0:8d87bc453349 634 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
ninoderkinderen 0:8d87bc453349 635 dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
ninoderkinderen 0:8d87bc453349 636 if (dhcp == NULL) {
ninoderkinderen 0:8d87bc453349 637 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
ninoderkinderen 0:8d87bc453349 638 return ERR_MEM;
ninoderkinderen 0:8d87bc453349 639 }
ninoderkinderen 0:8d87bc453349 640 /* store this dhcp client in the netif */
ninoderkinderen 0:8d87bc453349 641 netif->dhcp = dhcp;
ninoderkinderen 0:8d87bc453349 642 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
ninoderkinderen 0:8d87bc453349 643 /* already has DHCP client attached */
ninoderkinderen 0:8d87bc453349 644 } else {
ninoderkinderen 0:8d87bc453349 645 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
ninoderkinderen 0:8d87bc453349 646 if (dhcp->pcb != NULL) {
ninoderkinderen 0:8d87bc453349 647 udp_remove(dhcp->pcb);
ninoderkinderen 0:8d87bc453349 648 }
ninoderkinderen 0:8d87bc453349 649 LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
ninoderkinderen 0:8d87bc453349 650 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
ninoderkinderen 0:8d87bc453349 651 }
ninoderkinderen 0:8d87bc453349 652
ninoderkinderen 0:8d87bc453349 653 /* clear data structure */
ninoderkinderen 0:8d87bc453349 654 memset(dhcp, 0, sizeof(struct dhcp));
ninoderkinderen 0:8d87bc453349 655 /* dhcp_set_state(&dhcp, DHCP_OFF); */
ninoderkinderen 0:8d87bc453349 656 /* allocate UDP PCB */
ninoderkinderen 0:8d87bc453349 657 dhcp->pcb = udp_new();
ninoderkinderen 0:8d87bc453349 658 if (dhcp->pcb == NULL) {
ninoderkinderen 0:8d87bc453349 659 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
ninoderkinderen 0:8d87bc453349 660 return ERR_MEM;
ninoderkinderen 0:8d87bc453349 661 }
ninoderkinderen 0:8d87bc453349 662 dhcp->pcb->so_options |= SOF_BROADCAST;
ninoderkinderen 0:8d87bc453349 663 /* set up local and remote port for the pcb */
ninoderkinderen 0:8d87bc453349 664 udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
ninoderkinderen 0:8d87bc453349 665 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
ninoderkinderen 0:8d87bc453349 666 /* set up the recv callback and argument */
ninoderkinderen 0:8d87bc453349 667 udp_recv(dhcp->pcb, dhcp_recv, netif);
ninoderkinderen 0:8d87bc453349 668 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
ninoderkinderen 0:8d87bc453349 669 /* (re)start the DHCP negotiation */
ninoderkinderen 0:8d87bc453349 670 result = dhcp_discover(netif);
ninoderkinderen 0:8d87bc453349 671 if (result != ERR_OK) {
ninoderkinderen 0:8d87bc453349 672 /* free resources allocated above */
ninoderkinderen 0:8d87bc453349 673 dhcp_stop(netif);
ninoderkinderen 0:8d87bc453349 674 return ERR_MEM;
ninoderkinderen 0:8d87bc453349 675 }
ninoderkinderen 0:8d87bc453349 676 /* Set the flag that says this netif is handled by DHCP. */
ninoderkinderen 0:8d87bc453349 677 netif->flags |= NETIF_FLAG_DHCP;
ninoderkinderen 0:8d87bc453349 678 return result;
ninoderkinderen 0:8d87bc453349 679 }
ninoderkinderen 0:8d87bc453349 680
ninoderkinderen 0:8d87bc453349 681 /**
ninoderkinderen 0:8d87bc453349 682 * Inform a DHCP server of our manual configuration.
ninoderkinderen 0:8d87bc453349 683 *
ninoderkinderen 0:8d87bc453349 684 * This informs DHCP servers of our fixed IP address configuration
ninoderkinderen 0:8d87bc453349 685 * by sending an INFORM message. It does not involve DHCP address
ninoderkinderen 0:8d87bc453349 686 * configuration, it is just here to be nice to the network.
ninoderkinderen 0:8d87bc453349 687 *
ninoderkinderen 0:8d87bc453349 688 * @param netif The lwIP network interface
ninoderkinderen 0:8d87bc453349 689 */
ninoderkinderen 0:8d87bc453349 690 void
ninoderkinderen 0:8d87bc453349 691 dhcp_inform(struct netif *netif)
ninoderkinderen 0:8d87bc453349 692 {
ninoderkinderen 0:8d87bc453349 693 struct dhcp dhcp;
ninoderkinderen 0:8d87bc453349 694 err_t result = ERR_OK;
ninoderkinderen 0:8d87bc453349 695 struct udp_pcb *pcb;
ninoderkinderen 0:8d87bc453349 696
ninoderkinderen 0:8d87bc453349 697 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
ninoderkinderen 0:8d87bc453349 698
ninoderkinderen 0:8d87bc453349 699 memset(&dhcp, 0, sizeof(struct dhcp));
ninoderkinderen 0:8d87bc453349 700 dhcp_set_state(&dhcp, DHCP_INFORM);
ninoderkinderen 0:8d87bc453349 701
ninoderkinderen 0:8d87bc453349 702 if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
ninoderkinderen 0:8d87bc453349 703 /* re-use existing pcb */
ninoderkinderen 0:8d87bc453349 704 pcb = netif->dhcp->pcb;
ninoderkinderen 0:8d87bc453349 705 } else {
ninoderkinderen 0:8d87bc453349 706 pcb = udp_new();
ninoderkinderen 0:8d87bc453349 707 if (pcb == NULL) {
ninoderkinderen 0:8d87bc453349 708 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
ninoderkinderen 0:8d87bc453349 709 return;
ninoderkinderen 0:8d87bc453349 710 }
ninoderkinderen 0:8d87bc453349 711 dhcp.pcb = pcb;
ninoderkinderen 0:8d87bc453349 712 dhcp.pcb->so_options |= SOF_BROADCAST;
ninoderkinderen 0:8d87bc453349 713 udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
ninoderkinderen 0:8d87bc453349 714 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
ninoderkinderen 0:8d87bc453349 715 }
ninoderkinderen 0:8d87bc453349 716 /* create and initialize the DHCP message header */
ninoderkinderen 0:8d87bc453349 717 result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
ninoderkinderen 0:8d87bc453349 718 if (result == ERR_OK) {
ninoderkinderen 0:8d87bc453349 719 dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
ninoderkinderen 0:8d87bc453349 720 dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
ninoderkinderen 0:8d87bc453349 721
ninoderkinderen 0:8d87bc453349 722 dhcp_option_trailer(&dhcp);
ninoderkinderen 0:8d87bc453349 723
ninoderkinderen 0:8d87bc453349 724 pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
ninoderkinderen 0:8d87bc453349 725
ninoderkinderen 0:8d87bc453349 726 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
ninoderkinderen 0:8d87bc453349 727 udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
ninoderkinderen 0:8d87bc453349 728 dhcp_delete_msg(&dhcp);
ninoderkinderen 0:8d87bc453349 729 } else {
ninoderkinderen 0:8d87bc453349 730 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
ninoderkinderen 0:8d87bc453349 731 }
ninoderkinderen 0:8d87bc453349 732
ninoderkinderen 0:8d87bc453349 733 if (dhcp.pcb != NULL) {
ninoderkinderen 0:8d87bc453349 734 /* otherwise, the existing pcb was used */
ninoderkinderen 0:8d87bc453349 735 udp_remove(dhcp.pcb);
ninoderkinderen 0:8d87bc453349 736 }
ninoderkinderen 0:8d87bc453349 737 }
ninoderkinderen 0:8d87bc453349 738
ninoderkinderen 0:8d87bc453349 739 /** Handle a possible change in the network configuration.
ninoderkinderen 0:8d87bc453349 740 *
ninoderkinderen 0:8d87bc453349 741 * This enters the REBOOTING state to verify that the currently bound
ninoderkinderen 0:8d87bc453349 742 * address is still valid.
ninoderkinderen 0:8d87bc453349 743 */
ninoderkinderen 0:8d87bc453349 744 void
ninoderkinderen 0:8d87bc453349 745 dhcp_network_changed(struct netif *netif)
ninoderkinderen 0:8d87bc453349 746 {
ninoderkinderen 0:8d87bc453349 747 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 748 if (!dhcp)
ninoderkinderen 0:8d87bc453349 749 return;
ninoderkinderen 0:8d87bc453349 750 switch (dhcp->state) {
ninoderkinderen 0:8d87bc453349 751 case DHCP_REBINDING:
ninoderkinderen 0:8d87bc453349 752 case DHCP_RENEWING:
ninoderkinderen 0:8d87bc453349 753 case DHCP_BOUND:
ninoderkinderen 0:8d87bc453349 754 case DHCP_REBOOTING:
ninoderkinderen 0:8d87bc453349 755 netif_set_down(netif);
ninoderkinderen 0:8d87bc453349 756 dhcp->tries = 0;
ninoderkinderen 0:8d87bc453349 757 dhcp_reboot(netif);
ninoderkinderen 0:8d87bc453349 758 break;
ninoderkinderen 0:8d87bc453349 759 case DHCP_OFF:
ninoderkinderen 0:8d87bc453349 760 /* stay off */
ninoderkinderen 0:8d87bc453349 761 break;
ninoderkinderen 0:8d87bc453349 762 default:
ninoderkinderen 0:8d87bc453349 763 dhcp->tries = 0;
ninoderkinderen 0:8d87bc453349 764 #if LWIP_DHCP_AUTOIP_COOP
ninoderkinderen 0:8d87bc453349 765 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
ninoderkinderen 0:8d87bc453349 766 #endif /* LWIP_DHCP_AUTOIP_COOP */
ninoderkinderen 0:8d87bc453349 767 dhcp_discover(netif);
ninoderkinderen 0:8d87bc453349 768 break;
ninoderkinderen 0:8d87bc453349 769 }
ninoderkinderen 0:8d87bc453349 770 }
ninoderkinderen 0:8d87bc453349 771
ninoderkinderen 0:8d87bc453349 772 #if DHCP_DOES_ARP_CHECK
ninoderkinderen 0:8d87bc453349 773 /**
ninoderkinderen 0:8d87bc453349 774 * Match an ARP reply with the offered IP address.
ninoderkinderen 0:8d87bc453349 775 *
ninoderkinderen 0:8d87bc453349 776 * @param netif the network interface on which the reply was received
ninoderkinderen 0:8d87bc453349 777 * @param addr The IP address we received a reply from
ninoderkinderen 0:8d87bc453349 778 */
ninoderkinderen 0:8d87bc453349 779 void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
ninoderkinderen 0:8d87bc453349 780 {
ninoderkinderen 0:8d87bc453349 781 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
ninoderkinderen 0:8d87bc453349 782 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
ninoderkinderen 0:8d87bc453349 783 /* is a DHCP client doing an ARP check? */
ninoderkinderen 0:8d87bc453349 784 if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
ninoderkinderen 0:8d87bc453349 785 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
ninoderkinderen 0:8d87bc453349 786 ip4_addr_get_u32(addr)));
ninoderkinderen 0:8d87bc453349 787 /* did a host respond with the address we
ninoderkinderen 0:8d87bc453349 788 were offered by the DHCP server? */
ninoderkinderen 0:8d87bc453349 789 if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
ninoderkinderen 0:8d87bc453349 790 /* we will not accept the offered address */
ninoderkinderen 0:8d87bc453349 791 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
ninoderkinderen 0:8d87bc453349 792 ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
ninoderkinderen 0:8d87bc453349 793 dhcp_decline(netif);
ninoderkinderen 0:8d87bc453349 794 }
ninoderkinderen 0:8d87bc453349 795 }
ninoderkinderen 0:8d87bc453349 796 }
ninoderkinderen 0:8d87bc453349 797
ninoderkinderen 0:8d87bc453349 798 /**
ninoderkinderen 0:8d87bc453349 799 * Decline an offered lease.
ninoderkinderen 0:8d87bc453349 800 *
ninoderkinderen 0:8d87bc453349 801 * Tell the DHCP server we do not accept the offered address.
ninoderkinderen 0:8d87bc453349 802 * One reason to decline the lease is when we find out the address
ninoderkinderen 0:8d87bc453349 803 * is already in use by another host (through ARP).
ninoderkinderen 0:8d87bc453349 804 *
ninoderkinderen 0:8d87bc453349 805 * @param netif the netif under DHCP control
ninoderkinderen 0:8d87bc453349 806 */
ninoderkinderen 0:8d87bc453349 807 static err_t
ninoderkinderen 0:8d87bc453349 808 dhcp_decline(struct netif *netif)
ninoderkinderen 0:8d87bc453349 809 {
ninoderkinderen 0:8d87bc453349 810 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 811 err_t result = ERR_OK;
ninoderkinderen 0:8d87bc453349 812 u16_t msecs;
ninoderkinderen 0:8d87bc453349 813 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
ninoderkinderen 0:8d87bc453349 814 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
ninoderkinderen 0:8d87bc453349 815 /* create and initialize the DHCP message header */
ninoderkinderen 0:8d87bc453349 816 result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
ninoderkinderen 0:8d87bc453349 817 if (result == ERR_OK) {
ninoderkinderen 0:8d87bc453349 818 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
ninoderkinderen 0:8d87bc453349 819 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
ninoderkinderen 0:8d87bc453349 820
ninoderkinderen 0:8d87bc453349 821 dhcp_option_trailer(dhcp);
ninoderkinderen 0:8d87bc453349 822 /* resize pbuf to reflect true size of options */
ninoderkinderen 0:8d87bc453349 823 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ninoderkinderen 0:8d87bc453349 824
ninoderkinderen 0:8d87bc453349 825 /* per section 4.4.4, broadcast DECLINE messages */
ninoderkinderen 0:8d87bc453349 826 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
ninoderkinderen 0:8d87bc453349 827 dhcp_delete_msg(dhcp);
ninoderkinderen 0:8d87bc453349 828 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
ninoderkinderen 0:8d87bc453349 829 } else {
ninoderkinderen 0:8d87bc453349 830 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
ninoderkinderen 0:8d87bc453349 831 ("dhcp_decline: could not allocate DHCP request\n"));
ninoderkinderen 0:8d87bc453349 832 }
ninoderkinderen 0:8d87bc453349 833 dhcp->tries++;
ninoderkinderen 0:8d87bc453349 834 msecs = 10*1000;
ninoderkinderen 0:8d87bc453349 835 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ninoderkinderen 0:8d87bc453349 836 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
ninoderkinderen 0:8d87bc453349 837 return result;
ninoderkinderen 0:8d87bc453349 838 }
ninoderkinderen 0:8d87bc453349 839 #endif /* DHCP_DOES_ARP_CHECK */
ninoderkinderen 0:8d87bc453349 840
ninoderkinderen 0:8d87bc453349 841
ninoderkinderen 0:8d87bc453349 842 /**
ninoderkinderen 0:8d87bc453349 843 * Start the DHCP process, discover a DHCP server.
ninoderkinderen 0:8d87bc453349 844 *
ninoderkinderen 0:8d87bc453349 845 * @param netif the netif under DHCP control
ninoderkinderen 0:8d87bc453349 846 */
ninoderkinderen 0:8d87bc453349 847 static err_t
ninoderkinderen 0:8d87bc453349 848 dhcp_discover(struct netif *netif)
ninoderkinderen 0:8d87bc453349 849 {
ninoderkinderen 0:8d87bc453349 850 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 851 err_t result = ERR_OK;
ninoderkinderen 0:8d87bc453349 852 u16_t msecs;
ninoderkinderen 0:8d87bc453349 853 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
ninoderkinderen 0:8d87bc453349 854 ip_addr_set_any(&dhcp->offered_ip_addr);
ninoderkinderen 0:8d87bc453349 855 dhcp_set_state(dhcp, DHCP_SELECTING);
ninoderkinderen 0:8d87bc453349 856 /* create and initialize the DHCP message header */
ninoderkinderen 0:8d87bc453349 857 result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
ninoderkinderen 0:8d87bc453349 858 if (result == ERR_OK) {
ninoderkinderen 0:8d87bc453349 859 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
ninoderkinderen 0:8d87bc453349 860
ninoderkinderen 0:8d87bc453349 861 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
ninoderkinderen 0:8d87bc453349 862 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
ninoderkinderen 0:8d87bc453349 863
ninoderkinderen 0:8d87bc453349 864 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
ninoderkinderen 0:8d87bc453349 865 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
ninoderkinderen 0:8d87bc453349 866 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
ninoderkinderen 0:8d87bc453349 867 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
ninoderkinderen 0:8d87bc453349 868 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
ninoderkinderen 0:8d87bc453349 869
ninoderkinderen 0:8d87bc453349 870 dhcp_option_trailer(dhcp);
ninoderkinderen 0:8d87bc453349 871
ninoderkinderen 0:8d87bc453349 872 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
ninoderkinderen 0:8d87bc453349 873 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ninoderkinderen 0:8d87bc453349 874
ninoderkinderen 0:8d87bc453349 875 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
ninoderkinderen 0:8d87bc453349 876 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
ninoderkinderen 0:8d87bc453349 877 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
ninoderkinderen 0:8d87bc453349 878 dhcp_delete_msg(dhcp);
ninoderkinderen 0:8d87bc453349 879 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
ninoderkinderen 0:8d87bc453349 880 } else {
ninoderkinderen 0:8d87bc453349 881 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
ninoderkinderen 0:8d87bc453349 882 }
ninoderkinderen 0:8d87bc453349 883 dhcp->tries++;
ninoderkinderen 0:8d87bc453349 884 #if LWIP_DHCP_AUTOIP_COOP
ninoderkinderen 0:8d87bc453349 885 if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
ninoderkinderen 0:8d87bc453349 886 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
ninoderkinderen 0:8d87bc453349 887 autoip_start(netif);
ninoderkinderen 0:8d87bc453349 888 }
ninoderkinderen 0:8d87bc453349 889 #endif /* LWIP_DHCP_AUTOIP_COOP */
ninoderkinderen 0:8d87bc453349 890 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
ninoderkinderen 0:8d87bc453349 891 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ninoderkinderen 0:8d87bc453349 892 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
ninoderkinderen 0:8d87bc453349 893 return result;
ninoderkinderen 0:8d87bc453349 894 }
ninoderkinderen 0:8d87bc453349 895
ninoderkinderen 0:8d87bc453349 896
ninoderkinderen 0:8d87bc453349 897 /**
ninoderkinderen 0:8d87bc453349 898 * Bind the interface to the offered IP address.
ninoderkinderen 0:8d87bc453349 899 *
ninoderkinderen 0:8d87bc453349 900 * @param netif network interface to bind to the offered address
ninoderkinderen 0:8d87bc453349 901 */
ninoderkinderen 0:8d87bc453349 902 static void
ninoderkinderen 0:8d87bc453349 903 dhcp_bind(struct netif *netif)
ninoderkinderen 0:8d87bc453349 904 {
ninoderkinderen 0:8d87bc453349 905 u32_t timeout;
ninoderkinderen 0:8d87bc453349 906 struct dhcp *dhcp;
ninoderkinderen 0:8d87bc453349 907 ip_addr_t sn_mask, gw_addr;
ninoderkinderen 0:8d87bc453349 908 LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
ninoderkinderen 0:8d87bc453349 909 dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 910 LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
ninoderkinderen 0:8d87bc453349 911 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
ninoderkinderen 0:8d87bc453349 912
ninoderkinderen 0:8d87bc453349 913 /* temporary DHCP lease? */
ninoderkinderen 0:8d87bc453349 914 if (dhcp->offered_t1_renew != 0xffffffffUL) {
ninoderkinderen 0:8d87bc453349 915 /* set renewal period timer */
ninoderkinderen 0:8d87bc453349 916 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
ninoderkinderen 0:8d87bc453349 917 timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
ninoderkinderen 0:8d87bc453349 918 if(timeout > 0xffff) {
ninoderkinderen 0:8d87bc453349 919 timeout = 0xffff;
ninoderkinderen 0:8d87bc453349 920 }
ninoderkinderen 0:8d87bc453349 921 dhcp->t1_timeout = (u16_t)timeout;
ninoderkinderen 0:8d87bc453349 922 if (dhcp->t1_timeout == 0) {
ninoderkinderen 0:8d87bc453349 923 dhcp->t1_timeout = 1;
ninoderkinderen 0:8d87bc453349 924 }
ninoderkinderen 0:8d87bc453349 925 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
ninoderkinderen 0:8d87bc453349 926 }
ninoderkinderen 0:8d87bc453349 927 /* set renewal period timer */
ninoderkinderen 0:8d87bc453349 928 if (dhcp->offered_t2_rebind != 0xffffffffUL) {
ninoderkinderen 0:8d87bc453349 929 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
ninoderkinderen 0:8d87bc453349 930 timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
ninoderkinderen 0:8d87bc453349 931 if(timeout > 0xffff) {
ninoderkinderen 0:8d87bc453349 932 timeout = 0xffff;
ninoderkinderen 0:8d87bc453349 933 }
ninoderkinderen 0:8d87bc453349 934 dhcp->t2_timeout = (u16_t)timeout;
ninoderkinderen 0:8d87bc453349 935 if (dhcp->t2_timeout == 0) {
ninoderkinderen 0:8d87bc453349 936 dhcp->t2_timeout = 1;
ninoderkinderen 0:8d87bc453349 937 }
ninoderkinderen 0:8d87bc453349 938 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
ninoderkinderen 0:8d87bc453349 939 }
ninoderkinderen 0:8d87bc453349 940
ninoderkinderen 0:8d87bc453349 941 if (dhcp->subnet_mask_given) {
ninoderkinderen 0:8d87bc453349 942 /* copy offered network mask */
ninoderkinderen 0:8d87bc453349 943 ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
ninoderkinderen 0:8d87bc453349 944 } else {
ninoderkinderen 0:8d87bc453349 945 /* subnet mask not given, choose a safe subnet mask given the network class */
ninoderkinderen 0:8d87bc453349 946 u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
ninoderkinderen 0:8d87bc453349 947 if (first_octet <= 127) {
ninoderkinderen 0:8d87bc453349 948 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
ninoderkinderen 0:8d87bc453349 949 } else if (first_octet >= 192) {
ninoderkinderen 0:8d87bc453349 950 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
ninoderkinderen 0:8d87bc453349 951 } else {
ninoderkinderen 0:8d87bc453349 952 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
ninoderkinderen 0:8d87bc453349 953 }
ninoderkinderen 0:8d87bc453349 954 }
ninoderkinderen 0:8d87bc453349 955
ninoderkinderen 0:8d87bc453349 956 ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
ninoderkinderen 0:8d87bc453349 957 /* gateway address not given? */
ninoderkinderen 0:8d87bc453349 958 if (ip_addr_isany(&gw_addr)) {
ninoderkinderen 0:8d87bc453349 959 /* copy network address */
ninoderkinderen 0:8d87bc453349 960 ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
ninoderkinderen 0:8d87bc453349 961 /* use first host address on network as gateway */
ninoderkinderen 0:8d87bc453349 962 ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001));
ninoderkinderen 0:8d87bc453349 963 }
ninoderkinderen 0:8d87bc453349 964
ninoderkinderen 0:8d87bc453349 965 #if LWIP_DHCP_AUTOIP_COOP
ninoderkinderen 0:8d87bc453349 966 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
ninoderkinderen 0:8d87bc453349 967 autoip_stop(netif);
ninoderkinderen 0:8d87bc453349 968 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
ninoderkinderen 0:8d87bc453349 969 }
ninoderkinderen 0:8d87bc453349 970 #endif /* LWIP_DHCP_AUTOIP_COOP */
ninoderkinderen 0:8d87bc453349 971
ninoderkinderen 0:8d87bc453349 972 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
ninoderkinderen 0:8d87bc453349 973 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
ninoderkinderen 0:8d87bc453349 974 netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
ninoderkinderen 0:8d87bc453349 975 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
ninoderkinderen 0:8d87bc453349 976 ip4_addr_get_u32(&sn_mask)));
ninoderkinderen 0:8d87bc453349 977 netif_set_netmask(netif, &sn_mask);
ninoderkinderen 0:8d87bc453349 978 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
ninoderkinderen 0:8d87bc453349 979 ip4_addr_get_u32(&gw_addr)));
ninoderkinderen 0:8d87bc453349 980 netif_set_gw(netif, &gw_addr);
ninoderkinderen 0:8d87bc453349 981 /* bring the interface up */
ninoderkinderen 0:8d87bc453349 982 netif_set_up(netif);
ninoderkinderen 0:8d87bc453349 983 /* netif is now bound to DHCP leased address */
ninoderkinderen 0:8d87bc453349 984 dhcp_set_state(dhcp, DHCP_BOUND);
ninoderkinderen 0:8d87bc453349 985 }
ninoderkinderen 0:8d87bc453349 986
ninoderkinderen 0:8d87bc453349 987 /**
ninoderkinderen 0:8d87bc453349 988 * Renew an existing DHCP lease at the involved DHCP server.
ninoderkinderen 0:8d87bc453349 989 *
ninoderkinderen 0:8d87bc453349 990 * @param netif network interface which must renew its lease
ninoderkinderen 0:8d87bc453349 991 */
ninoderkinderen 0:8d87bc453349 992 err_t
ninoderkinderen 0:8d87bc453349 993 dhcp_renew(struct netif *netif)
ninoderkinderen 0:8d87bc453349 994 {
ninoderkinderen 0:8d87bc453349 995 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 996 err_t result;
ninoderkinderen 0:8d87bc453349 997 u16_t msecs;
ninoderkinderen 0:8d87bc453349 998 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
ninoderkinderen 0:8d87bc453349 999 dhcp_set_state(dhcp, DHCP_RENEWING);
ninoderkinderen 0:8d87bc453349 1000
ninoderkinderen 0:8d87bc453349 1001 /* create and initialize the DHCP message header */
ninoderkinderen 0:8d87bc453349 1002 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
ninoderkinderen 0:8d87bc453349 1003 if (result == ERR_OK) {
ninoderkinderen 0:8d87bc453349 1004 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
ninoderkinderen 0:8d87bc453349 1005 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
ninoderkinderen 0:8d87bc453349 1006
ninoderkinderen 0:8d87bc453349 1007 #if LWIP_NETIF_HOSTNAME
ninoderkinderen 0:8d87bc453349 1008 if (netif->hostname != NULL) {
ninoderkinderen 0:8d87bc453349 1009 const char *p = (const char*)netif->hostname;
ninoderkinderen 0:8d87bc453349 1010 u8_t namelen = (u8_t)strlen(p);
ninoderkinderen 0:8d87bc453349 1011 if (namelen > 0) {
ninoderkinderen 0:8d87bc453349 1012 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
ninoderkinderen 0:8d87bc453349 1013 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
ninoderkinderen 0:8d87bc453349 1014 while (*p) {
ninoderkinderen 0:8d87bc453349 1015 dhcp_option_byte(dhcp, *p++);
ninoderkinderen 0:8d87bc453349 1016 }
ninoderkinderen 0:8d87bc453349 1017 }
ninoderkinderen 0:8d87bc453349 1018 }
ninoderkinderen 0:8d87bc453349 1019 #endif /* LWIP_NETIF_HOSTNAME */
ninoderkinderen 0:8d87bc453349 1020
ninoderkinderen 0:8d87bc453349 1021 #if 0
ninoderkinderen 0:8d87bc453349 1022 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
ninoderkinderen 0:8d87bc453349 1023 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
ninoderkinderen 0:8d87bc453349 1024 #endif
ninoderkinderen 0:8d87bc453349 1025
ninoderkinderen 0:8d87bc453349 1026 #if 0
ninoderkinderen 0:8d87bc453349 1027 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
ninoderkinderen 0:8d87bc453349 1028 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
ninoderkinderen 0:8d87bc453349 1029 #endif
ninoderkinderen 0:8d87bc453349 1030 /* append DHCP message trailer */
ninoderkinderen 0:8d87bc453349 1031 dhcp_option_trailer(dhcp);
ninoderkinderen 0:8d87bc453349 1032
ninoderkinderen 0:8d87bc453349 1033 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ninoderkinderen 0:8d87bc453349 1034
ninoderkinderen 0:8d87bc453349 1035 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
ninoderkinderen 0:8d87bc453349 1036 dhcp_delete_msg(dhcp);
ninoderkinderen 0:8d87bc453349 1037
ninoderkinderen 0:8d87bc453349 1038 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
ninoderkinderen 0:8d87bc453349 1039 } else {
ninoderkinderen 0:8d87bc453349 1040 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
ninoderkinderen 0:8d87bc453349 1041 }
ninoderkinderen 0:8d87bc453349 1042 dhcp->tries++;
ninoderkinderen 0:8d87bc453349 1043 /* back-off on retries, but to a maximum of 20 seconds */
ninoderkinderen 0:8d87bc453349 1044 msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
ninoderkinderen 0:8d87bc453349 1045 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ninoderkinderen 0:8d87bc453349 1046 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
ninoderkinderen 0:8d87bc453349 1047 return result;
ninoderkinderen 0:8d87bc453349 1048 }
ninoderkinderen 0:8d87bc453349 1049
ninoderkinderen 0:8d87bc453349 1050 /**
ninoderkinderen 0:8d87bc453349 1051 * Rebind with a DHCP server for an existing DHCP lease.
ninoderkinderen 0:8d87bc453349 1052 *
ninoderkinderen 0:8d87bc453349 1053 * @param netif network interface which must rebind with a DHCP server
ninoderkinderen 0:8d87bc453349 1054 */
ninoderkinderen 0:8d87bc453349 1055 static err_t
ninoderkinderen 0:8d87bc453349 1056 dhcp_rebind(struct netif *netif)
ninoderkinderen 0:8d87bc453349 1057 {
ninoderkinderen 0:8d87bc453349 1058 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 1059 err_t result;
ninoderkinderen 0:8d87bc453349 1060 u16_t msecs;
ninoderkinderen 0:8d87bc453349 1061 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
ninoderkinderen 0:8d87bc453349 1062 dhcp_set_state(dhcp, DHCP_REBINDING);
ninoderkinderen 0:8d87bc453349 1063
ninoderkinderen 0:8d87bc453349 1064 /* create and initialize the DHCP message header */
ninoderkinderen 0:8d87bc453349 1065 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
ninoderkinderen 0:8d87bc453349 1066 if (result == ERR_OK) {
ninoderkinderen 0:8d87bc453349 1067 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
ninoderkinderen 0:8d87bc453349 1068 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
ninoderkinderen 0:8d87bc453349 1069
ninoderkinderen 0:8d87bc453349 1070 #if LWIP_NETIF_HOSTNAME
ninoderkinderen 0:8d87bc453349 1071 if (netif->hostname != NULL) {
ninoderkinderen 0:8d87bc453349 1072 const char *p = (const char*)netif->hostname;
ninoderkinderen 0:8d87bc453349 1073 u8_t namelen = (u8_t)strlen(p);
ninoderkinderen 0:8d87bc453349 1074 if (namelen > 0) {
ninoderkinderen 0:8d87bc453349 1075 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
ninoderkinderen 0:8d87bc453349 1076 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
ninoderkinderen 0:8d87bc453349 1077 while (*p) {
ninoderkinderen 0:8d87bc453349 1078 dhcp_option_byte(dhcp, *p++);
ninoderkinderen 0:8d87bc453349 1079 }
ninoderkinderen 0:8d87bc453349 1080 }
ninoderkinderen 0:8d87bc453349 1081 }
ninoderkinderen 0:8d87bc453349 1082 #endif /* LWIP_NETIF_HOSTNAME */
ninoderkinderen 0:8d87bc453349 1083
ninoderkinderen 0:8d87bc453349 1084 #if 0
ninoderkinderen 0:8d87bc453349 1085 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
ninoderkinderen 0:8d87bc453349 1086 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
ninoderkinderen 0:8d87bc453349 1087
ninoderkinderen 0:8d87bc453349 1088 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
ninoderkinderen 0:8d87bc453349 1089 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
ninoderkinderen 0:8d87bc453349 1090 #endif
ninoderkinderen 0:8d87bc453349 1091
ninoderkinderen 0:8d87bc453349 1092 dhcp_option_trailer(dhcp);
ninoderkinderen 0:8d87bc453349 1093
ninoderkinderen 0:8d87bc453349 1094 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ninoderkinderen 0:8d87bc453349 1095
ninoderkinderen 0:8d87bc453349 1096 /* broadcast to server */
ninoderkinderen 0:8d87bc453349 1097 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
ninoderkinderen 0:8d87bc453349 1098 dhcp_delete_msg(dhcp);
ninoderkinderen 0:8d87bc453349 1099 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
ninoderkinderen 0:8d87bc453349 1100 } else {
ninoderkinderen 0:8d87bc453349 1101 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
ninoderkinderen 0:8d87bc453349 1102 }
ninoderkinderen 0:8d87bc453349 1103 dhcp->tries++;
ninoderkinderen 0:8d87bc453349 1104 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
ninoderkinderen 0:8d87bc453349 1105 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ninoderkinderen 0:8d87bc453349 1106 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
ninoderkinderen 0:8d87bc453349 1107 return result;
ninoderkinderen 0:8d87bc453349 1108 }
ninoderkinderen 0:8d87bc453349 1109
ninoderkinderen 0:8d87bc453349 1110 /**
ninoderkinderen 0:8d87bc453349 1111 * Enter REBOOTING state to verify an existing lease
ninoderkinderen 0:8d87bc453349 1112 *
ninoderkinderen 0:8d87bc453349 1113 * @param netif network interface which must reboot
ninoderkinderen 0:8d87bc453349 1114 */
ninoderkinderen 0:8d87bc453349 1115 static err_t
ninoderkinderen 0:8d87bc453349 1116 dhcp_reboot(struct netif *netif)
ninoderkinderen 0:8d87bc453349 1117 {
ninoderkinderen 0:8d87bc453349 1118 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 1119 err_t result;
ninoderkinderen 0:8d87bc453349 1120 u16_t msecs;
ninoderkinderen 0:8d87bc453349 1121 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
ninoderkinderen 0:8d87bc453349 1122 dhcp_set_state(dhcp, DHCP_REBOOTING);
ninoderkinderen 0:8d87bc453349 1123
ninoderkinderen 0:8d87bc453349 1124 /* create and initialize the DHCP message header */
ninoderkinderen 0:8d87bc453349 1125 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
ninoderkinderen 0:8d87bc453349 1126 if (result == ERR_OK) {
ninoderkinderen 0:8d87bc453349 1127 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
ninoderkinderen 0:8d87bc453349 1128 dhcp_option_short(dhcp, 576);
ninoderkinderen 0:8d87bc453349 1129
ninoderkinderen 0:8d87bc453349 1130 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
ninoderkinderen 0:8d87bc453349 1131 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
ninoderkinderen 0:8d87bc453349 1132
ninoderkinderen 0:8d87bc453349 1133 dhcp_option_trailer(dhcp);
ninoderkinderen 0:8d87bc453349 1134
ninoderkinderen 0:8d87bc453349 1135 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ninoderkinderen 0:8d87bc453349 1136
ninoderkinderen 0:8d87bc453349 1137 /* broadcast to server */
ninoderkinderen 0:8d87bc453349 1138 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
ninoderkinderen 0:8d87bc453349 1139 dhcp_delete_msg(dhcp);
ninoderkinderen 0:8d87bc453349 1140 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
ninoderkinderen 0:8d87bc453349 1141 } else {
ninoderkinderen 0:8d87bc453349 1142 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
ninoderkinderen 0:8d87bc453349 1143 }
ninoderkinderen 0:8d87bc453349 1144 dhcp->tries++;
ninoderkinderen 0:8d87bc453349 1145 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
ninoderkinderen 0:8d87bc453349 1146 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ninoderkinderen 0:8d87bc453349 1147 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
ninoderkinderen 0:8d87bc453349 1148 return result;
ninoderkinderen 0:8d87bc453349 1149 }
ninoderkinderen 0:8d87bc453349 1150
ninoderkinderen 0:8d87bc453349 1151
ninoderkinderen 0:8d87bc453349 1152 /**
ninoderkinderen 0:8d87bc453349 1153 * Release a DHCP lease.
ninoderkinderen 0:8d87bc453349 1154 *
ninoderkinderen 0:8d87bc453349 1155 * @param netif network interface which must release its lease
ninoderkinderen 0:8d87bc453349 1156 */
ninoderkinderen 0:8d87bc453349 1157 err_t
ninoderkinderen 0:8d87bc453349 1158 dhcp_release(struct netif *netif)
ninoderkinderen 0:8d87bc453349 1159 {
ninoderkinderen 0:8d87bc453349 1160 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 1161 err_t result;
ninoderkinderen 0:8d87bc453349 1162 u16_t msecs;
ninoderkinderen 0:8d87bc453349 1163 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
ninoderkinderen 0:8d87bc453349 1164
ninoderkinderen 0:8d87bc453349 1165 /* idle DHCP client */
ninoderkinderen 0:8d87bc453349 1166 dhcp_set_state(dhcp, DHCP_OFF);
ninoderkinderen 0:8d87bc453349 1167 /* clean old DHCP offer */
ninoderkinderen 0:8d87bc453349 1168 ip_addr_set_zero(&dhcp->server_ip_addr);
ninoderkinderen 0:8d87bc453349 1169 ip_addr_set_zero(&dhcp->offered_ip_addr);
ninoderkinderen 0:8d87bc453349 1170 ip_addr_set_zero(&dhcp->offered_sn_mask);
ninoderkinderen 0:8d87bc453349 1171 ip_addr_set_zero(&dhcp->offered_gw_addr);
ninoderkinderen 0:8d87bc453349 1172 #if LWIP_DHCP_BOOTP_FILE
ninoderkinderen 0:8d87bc453349 1173 ip_addr_set_zero(&dhcp->offered_si_addr);
ninoderkinderen 0:8d87bc453349 1174 #endif /* LWIP_DHCP_BOOTP_FILE */
ninoderkinderen 0:8d87bc453349 1175 dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
ninoderkinderen 0:8d87bc453349 1176
ninoderkinderen 0:8d87bc453349 1177 /* create and initialize the DHCP message header */
ninoderkinderen 0:8d87bc453349 1178 result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
ninoderkinderen 0:8d87bc453349 1179 if (result == ERR_OK) {
ninoderkinderen 0:8d87bc453349 1180 dhcp_option_trailer(dhcp);
ninoderkinderen 0:8d87bc453349 1181
ninoderkinderen 0:8d87bc453349 1182 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ninoderkinderen 0:8d87bc453349 1183
ninoderkinderen 0:8d87bc453349 1184 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
ninoderkinderen 0:8d87bc453349 1185 dhcp_delete_msg(dhcp);
ninoderkinderen 0:8d87bc453349 1186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
ninoderkinderen 0:8d87bc453349 1187 } else {
ninoderkinderen 0:8d87bc453349 1188 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
ninoderkinderen 0:8d87bc453349 1189 }
ninoderkinderen 0:8d87bc453349 1190 dhcp->tries++;
ninoderkinderen 0:8d87bc453349 1191 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
ninoderkinderen 0:8d87bc453349 1192 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ninoderkinderen 0:8d87bc453349 1193 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
ninoderkinderen 0:8d87bc453349 1194 /* bring the interface down */
ninoderkinderen 0:8d87bc453349 1195 netif_set_down(netif);
ninoderkinderen 0:8d87bc453349 1196 /* remove IP address from interface */
ninoderkinderen 0:8d87bc453349 1197 netif_set_ipaddr(netif, IP_ADDR_ANY);
ninoderkinderen 0:8d87bc453349 1198 netif_set_gw(netif, IP_ADDR_ANY);
ninoderkinderen 0:8d87bc453349 1199 netif_set_netmask(netif, IP_ADDR_ANY);
ninoderkinderen 0:8d87bc453349 1200
ninoderkinderen 0:8d87bc453349 1201 return result;
ninoderkinderen 0:8d87bc453349 1202 }
ninoderkinderen 0:8d87bc453349 1203
ninoderkinderen 0:8d87bc453349 1204 /**
ninoderkinderen 0:8d87bc453349 1205 * Remove the DHCP client from the interface.
ninoderkinderen 0:8d87bc453349 1206 *
ninoderkinderen 0:8d87bc453349 1207 * @param netif The network interface to stop DHCP on
ninoderkinderen 0:8d87bc453349 1208 */
ninoderkinderen 0:8d87bc453349 1209 void
ninoderkinderen 0:8d87bc453349 1210 dhcp_stop(struct netif *netif)
ninoderkinderen 0:8d87bc453349 1211 {
ninoderkinderen 0:8d87bc453349 1212 struct dhcp *dhcp;
ninoderkinderen 0:8d87bc453349 1213 LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
ninoderkinderen 0:8d87bc453349 1214 dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 1215 /* Remove the flag that says this netif is handled by DHCP. */
ninoderkinderen 0:8d87bc453349 1216 netif->flags &= ~NETIF_FLAG_DHCP;
ninoderkinderen 0:8d87bc453349 1217
ninoderkinderen 0:8d87bc453349 1218 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
ninoderkinderen 0:8d87bc453349 1219 /* netif is DHCP configured? */
ninoderkinderen 0:8d87bc453349 1220 if (dhcp != NULL) {
ninoderkinderen 0:8d87bc453349 1221 #if LWIP_DHCP_AUTOIP_COOP
ninoderkinderen 0:8d87bc453349 1222 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
ninoderkinderen 0:8d87bc453349 1223 autoip_stop(netif);
ninoderkinderen 0:8d87bc453349 1224 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
ninoderkinderen 0:8d87bc453349 1225 }
ninoderkinderen 0:8d87bc453349 1226 #endif /* LWIP_DHCP_AUTOIP_COOP */
ninoderkinderen 0:8d87bc453349 1227
ninoderkinderen 0:8d87bc453349 1228 if (dhcp->pcb != NULL) {
ninoderkinderen 0:8d87bc453349 1229 udp_remove(dhcp->pcb);
ninoderkinderen 0:8d87bc453349 1230 dhcp->pcb = NULL;
ninoderkinderen 0:8d87bc453349 1231 }
ninoderkinderen 0:8d87bc453349 1232 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
ninoderkinderen 0:8d87bc453349 1233 dhcp_set_state(dhcp, DHCP_OFF);
ninoderkinderen 0:8d87bc453349 1234 }
ninoderkinderen 0:8d87bc453349 1235 }
ninoderkinderen 0:8d87bc453349 1236
ninoderkinderen 0:8d87bc453349 1237 /*
ninoderkinderen 0:8d87bc453349 1238 * Set the DHCP state of a DHCP client.
ninoderkinderen 0:8d87bc453349 1239 *
ninoderkinderen 0:8d87bc453349 1240 * If the state changed, reset the number of tries.
ninoderkinderen 0:8d87bc453349 1241 */
ninoderkinderen 0:8d87bc453349 1242 static void
ninoderkinderen 0:8d87bc453349 1243 dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
ninoderkinderen 0:8d87bc453349 1244 {
ninoderkinderen 0:8d87bc453349 1245 if (new_state != dhcp->state) {
ninoderkinderen 0:8d87bc453349 1246 dhcp->state = new_state;
ninoderkinderen 0:8d87bc453349 1247 dhcp->tries = 0;
ninoderkinderen 0:8d87bc453349 1248 dhcp->request_timeout = 0;
ninoderkinderen 0:8d87bc453349 1249 }
ninoderkinderen 0:8d87bc453349 1250 }
ninoderkinderen 0:8d87bc453349 1251
ninoderkinderen 0:8d87bc453349 1252 /*
ninoderkinderen 0:8d87bc453349 1253 * Concatenate an option type and length field to the outgoing
ninoderkinderen 0:8d87bc453349 1254 * DHCP message.
ninoderkinderen 0:8d87bc453349 1255 *
ninoderkinderen 0:8d87bc453349 1256 */
ninoderkinderen 0:8d87bc453349 1257 static void
ninoderkinderen 0:8d87bc453349 1258 dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
ninoderkinderen 0:8d87bc453349 1259 {
ninoderkinderen 0:8d87bc453349 1260 LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
ninoderkinderen 0:8d87bc453349 1261 dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
ninoderkinderen 0:8d87bc453349 1262 dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
ninoderkinderen 0:8d87bc453349 1263 }
ninoderkinderen 0:8d87bc453349 1264 /*
ninoderkinderen 0:8d87bc453349 1265 * Concatenate a single byte to the outgoing DHCP message.
ninoderkinderen 0:8d87bc453349 1266 *
ninoderkinderen 0:8d87bc453349 1267 */
ninoderkinderen 0:8d87bc453349 1268 static void
ninoderkinderen 0:8d87bc453349 1269 dhcp_option_byte(struct dhcp *dhcp, u8_t value)
ninoderkinderen 0:8d87bc453349 1270 {
ninoderkinderen 0:8d87bc453349 1271 LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
ninoderkinderen 0:8d87bc453349 1272 dhcp->msg_out->options[dhcp->options_out_len++] = value;
ninoderkinderen 0:8d87bc453349 1273 }
ninoderkinderen 0:8d87bc453349 1274
ninoderkinderen 0:8d87bc453349 1275 static void
ninoderkinderen 0:8d87bc453349 1276 dhcp_option_short(struct dhcp *dhcp, u16_t value)
ninoderkinderen 0:8d87bc453349 1277 {
ninoderkinderen 0:8d87bc453349 1278 LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
ninoderkinderen 0:8d87bc453349 1279 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
ninoderkinderen 0:8d87bc453349 1280 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
ninoderkinderen 0:8d87bc453349 1281 }
ninoderkinderen 0:8d87bc453349 1282
ninoderkinderen 0:8d87bc453349 1283 static void
ninoderkinderen 0:8d87bc453349 1284 dhcp_option_long(struct dhcp *dhcp, u32_t value)
ninoderkinderen 0:8d87bc453349 1285 {
ninoderkinderen 0:8d87bc453349 1286 LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
ninoderkinderen 0:8d87bc453349 1287 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
ninoderkinderen 0:8d87bc453349 1288 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
ninoderkinderen 0:8d87bc453349 1289 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
ninoderkinderen 0:8d87bc453349 1290 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
ninoderkinderen 0:8d87bc453349 1291 }
ninoderkinderen 0:8d87bc453349 1292
ninoderkinderen 0:8d87bc453349 1293 /**
ninoderkinderen 0:8d87bc453349 1294 * Extract the DHCP message and the DHCP options.
ninoderkinderen 0:8d87bc453349 1295 *
ninoderkinderen 0:8d87bc453349 1296 * Extract the DHCP message and the DHCP options, each into a contiguous
ninoderkinderen 0:8d87bc453349 1297 * piece of memory. As a DHCP message is variable sized by its options,
ninoderkinderen 0:8d87bc453349 1298 * and also allows overriding some fields for options, the easy approach
ninoderkinderen 0:8d87bc453349 1299 * is to first unfold the options into a conitguous piece of memory, and
ninoderkinderen 0:8d87bc453349 1300 * use that further on.
ninoderkinderen 0:8d87bc453349 1301 *
ninoderkinderen 0:8d87bc453349 1302 */
ninoderkinderen 0:8d87bc453349 1303 static err_t
ninoderkinderen 0:8d87bc453349 1304 dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
ninoderkinderen 0:8d87bc453349 1305 {
ninoderkinderen 0:8d87bc453349 1306 u8_t *options;
ninoderkinderen 0:8d87bc453349 1307 u16_t offset;
ninoderkinderen 0:8d87bc453349 1308 u16_t offset_max;
ninoderkinderen 0:8d87bc453349 1309 u16_t options_idx;
ninoderkinderen 0:8d87bc453349 1310 u16_t options_idx_max;
ninoderkinderen 0:8d87bc453349 1311 struct pbuf *q;
ninoderkinderen 0:8d87bc453349 1312 int parse_file_as_options = 0;
ninoderkinderen 0:8d87bc453349 1313 int parse_sname_as_options = 0;
ninoderkinderen 0:8d87bc453349 1314
ninoderkinderen 0:8d87bc453349 1315 /* clear received options */
ninoderkinderen 0:8d87bc453349 1316 dhcp_clear_all_options(dhcp);
ninoderkinderen 0:8d87bc453349 1317 /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
ninoderkinderen 0:8d87bc453349 1318 if (p->len < DHCP_SNAME_OFS) {
ninoderkinderen 0:8d87bc453349 1319 return ERR_BUF;
ninoderkinderen 0:8d87bc453349 1320 }
ninoderkinderen 0:8d87bc453349 1321 dhcp->msg_in = (struct dhcp_msg *)p->payload;
ninoderkinderen 0:8d87bc453349 1322 #if LWIP_DHCP_BOOTP_FILE
ninoderkinderen 0:8d87bc453349 1323 /* clear boot file name */
ninoderkinderen 0:8d87bc453349 1324 dhcp->boot_file_name[0] = 0;
ninoderkinderen 0:8d87bc453349 1325 #endif /* LWIP_DHCP_BOOTP_FILE */
ninoderkinderen 0:8d87bc453349 1326
ninoderkinderen 0:8d87bc453349 1327 /* parse options */
ninoderkinderen 0:8d87bc453349 1328
ninoderkinderen 0:8d87bc453349 1329 /* start with options field */
ninoderkinderen 0:8d87bc453349 1330 options_idx = DHCP_OPTIONS_OFS;
ninoderkinderen 0:8d87bc453349 1331 /* parse options to the end of the received packet */
ninoderkinderen 0:8d87bc453349 1332 options_idx_max = p->tot_len;
ninoderkinderen 0:8d87bc453349 1333 again:
ninoderkinderen 0:8d87bc453349 1334 q = p;
ninoderkinderen 0:8d87bc453349 1335 while((q != NULL) && (options_idx >= q->len)) {
ninoderkinderen 0:8d87bc453349 1336 options_idx -= q->len;
ninoderkinderen 0:8d87bc453349 1337 options_idx_max -= q->len;
ninoderkinderen 0:8d87bc453349 1338 q = q->next;
ninoderkinderen 0:8d87bc453349 1339 }
ninoderkinderen 0:8d87bc453349 1340 if (q == NULL) {
ninoderkinderen 0:8d87bc453349 1341 return ERR_BUF;
ninoderkinderen 0:8d87bc453349 1342 }
ninoderkinderen 0:8d87bc453349 1343 offset = options_idx;
ninoderkinderen 0:8d87bc453349 1344 offset_max = options_idx_max;
ninoderkinderen 0:8d87bc453349 1345 options = (u8_t*)q->payload;
ninoderkinderen 0:8d87bc453349 1346 /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
ninoderkinderen 0:8d87bc453349 1347 while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
ninoderkinderen 0:8d87bc453349 1348 u8_t op = options[offset];
ninoderkinderen 0:8d87bc453349 1349 u8_t len;
ninoderkinderen 0:8d87bc453349 1350 u8_t decode_len = 0;
ninoderkinderen 0:8d87bc453349 1351 int decode_idx = -1;
ninoderkinderen 0:8d87bc453349 1352 u16_t val_offset = offset + 2;
ninoderkinderen 0:8d87bc453349 1353 /* len byte might be in the next pbuf */
ninoderkinderen 0:8d87bc453349 1354 if (offset + 1 < q->len) {
ninoderkinderen 0:8d87bc453349 1355 len = options[offset + 1];
ninoderkinderen 0:8d87bc453349 1356 } else {
ninoderkinderen 0:8d87bc453349 1357 len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
ninoderkinderen 0:8d87bc453349 1358 }
ninoderkinderen 0:8d87bc453349 1359 /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
ninoderkinderen 0:8d87bc453349 1360 decode_len = len;
ninoderkinderen 0:8d87bc453349 1361 switch(op) {
ninoderkinderen 0:8d87bc453349 1362 /* case(DHCP_OPTION_END): handled above */
ninoderkinderen 0:8d87bc453349 1363 case(DHCP_OPTION_PAD):
ninoderkinderen 0:8d87bc453349 1364 /* special option: no len encoded */
ninoderkinderen 0:8d87bc453349 1365 decode_len = len = 0;
ninoderkinderen 0:8d87bc453349 1366 /* will be increased below */
ninoderkinderen 0:8d87bc453349 1367 offset--;
ninoderkinderen 0:8d87bc453349 1368 break;
ninoderkinderen 0:8d87bc453349 1369 case(DHCP_OPTION_SUBNET_MASK):
ninoderkinderen 0:8d87bc453349 1370 LWIP_ASSERT("len == 4", len == 4);
ninoderkinderen 0:8d87bc453349 1371 decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
ninoderkinderen 0:8d87bc453349 1372 break;
ninoderkinderen 0:8d87bc453349 1373 case(DHCP_OPTION_ROUTER):
ninoderkinderen 0:8d87bc453349 1374 decode_len = 4; /* only copy the first given router */
ninoderkinderen 0:8d87bc453349 1375 LWIP_ASSERT("len >= decode_len", len >= decode_len);
ninoderkinderen 0:8d87bc453349 1376 decode_idx = DHCP_OPTION_IDX_ROUTER;
ninoderkinderen 0:8d87bc453349 1377 break;
ninoderkinderen 0:8d87bc453349 1378 case(DHCP_OPTION_DNS_SERVER):
ninoderkinderen 0:8d87bc453349 1379 /* special case: there might be more than one server */
ninoderkinderen 0:8d87bc453349 1380 LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
ninoderkinderen 0:8d87bc453349 1381 /* limit number of DNS servers */
ninoderkinderen 0:8d87bc453349 1382 decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
ninoderkinderen 0:8d87bc453349 1383 LWIP_ASSERT("len >= decode_len", len >= decode_len);
ninoderkinderen 0:8d87bc453349 1384 decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
ninoderkinderen 0:8d87bc453349 1385 break;
ninoderkinderen 0:8d87bc453349 1386 case(DHCP_OPTION_LEASE_TIME):
ninoderkinderen 0:8d87bc453349 1387 LWIP_ASSERT("len == 4", len == 4);
ninoderkinderen 0:8d87bc453349 1388 decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
ninoderkinderen 0:8d87bc453349 1389 break;
ninoderkinderen 0:8d87bc453349 1390 case(DHCP_OPTION_OVERLOAD):
ninoderkinderen 0:8d87bc453349 1391 LWIP_ASSERT("len == 1", len == 1);
ninoderkinderen 0:8d87bc453349 1392 decode_idx = DHCP_OPTION_IDX_OVERLOAD;
ninoderkinderen 0:8d87bc453349 1393 break;
ninoderkinderen 0:8d87bc453349 1394 case(DHCP_OPTION_MESSAGE_TYPE):
ninoderkinderen 0:8d87bc453349 1395 LWIP_ASSERT("len == 1", len == 1);
ninoderkinderen 0:8d87bc453349 1396 decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
ninoderkinderen 0:8d87bc453349 1397 break;
ninoderkinderen 0:8d87bc453349 1398 case(DHCP_OPTION_SERVER_ID):
ninoderkinderen 0:8d87bc453349 1399 LWIP_ASSERT("len == 4", len == 4);
ninoderkinderen 0:8d87bc453349 1400 decode_idx = DHCP_OPTION_IDX_SERVER_ID;
ninoderkinderen 0:8d87bc453349 1401 break;
ninoderkinderen 0:8d87bc453349 1402 case(DHCP_OPTION_T1):
ninoderkinderen 0:8d87bc453349 1403 LWIP_ASSERT("len == 4", len == 4);
ninoderkinderen 0:8d87bc453349 1404 decode_idx = DHCP_OPTION_IDX_T1;
ninoderkinderen 0:8d87bc453349 1405 break;
ninoderkinderen 0:8d87bc453349 1406 case(DHCP_OPTION_T2):
ninoderkinderen 0:8d87bc453349 1407 LWIP_ASSERT("len == 4", len == 4);
ninoderkinderen 0:8d87bc453349 1408 decode_idx = DHCP_OPTION_IDX_T2;
ninoderkinderen 0:8d87bc453349 1409 break;
ninoderkinderen 0:8d87bc453349 1410 default:
ninoderkinderen 0:8d87bc453349 1411 decode_len = 0;
ninoderkinderen 0:8d87bc453349 1412 LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
ninoderkinderen 0:8d87bc453349 1413 break;
ninoderkinderen 0:8d87bc453349 1414 }
ninoderkinderen 0:8d87bc453349 1415 offset += len + 2;
ninoderkinderen 0:8d87bc453349 1416 if (decode_len > 0) {
ninoderkinderen 0:8d87bc453349 1417 u32_t value = 0;
ninoderkinderen 0:8d87bc453349 1418 u16_t copy_len;
ninoderkinderen 0:8d87bc453349 1419 decode_next:
ninoderkinderen 0:8d87bc453349 1420 LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
ninoderkinderen 0:8d87bc453349 1421 LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
ninoderkinderen 0:8d87bc453349 1422 copy_len = LWIP_MIN(decode_len, 4);
ninoderkinderen 0:8d87bc453349 1423 pbuf_copy_partial(q, &value, copy_len, val_offset);
ninoderkinderen 0:8d87bc453349 1424 if (decode_len > 4) {
ninoderkinderen 0:8d87bc453349 1425 /* decode more than one u32_t */
ninoderkinderen 0:8d87bc453349 1426 LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
ninoderkinderen 0:8d87bc453349 1427 dhcp_got_option(dhcp, decode_idx);
ninoderkinderen 0:8d87bc453349 1428 dhcp_set_option_value(dhcp, decode_idx, htonl(value));
ninoderkinderen 0:8d87bc453349 1429 decode_len -= 4;
ninoderkinderen 0:8d87bc453349 1430 val_offset += 4;
ninoderkinderen 0:8d87bc453349 1431 decode_idx++;
ninoderkinderen 0:8d87bc453349 1432 goto decode_next;
ninoderkinderen 0:8d87bc453349 1433 } else if (decode_len == 4) {
ninoderkinderen 0:8d87bc453349 1434 value = ntohl(value);
ninoderkinderen 0:8d87bc453349 1435 } else {
ninoderkinderen 0:8d87bc453349 1436 LWIP_ASSERT("invalid decode_len", decode_len == 1);
ninoderkinderen 0:8d87bc453349 1437 value = ((u8_t*)&value)[0];
ninoderkinderen 0:8d87bc453349 1438 }
ninoderkinderen 0:8d87bc453349 1439 dhcp_got_option(dhcp, decode_idx);
ninoderkinderen 0:8d87bc453349 1440 dhcp_set_option_value(dhcp, decode_idx, value);
ninoderkinderen 0:8d87bc453349 1441 }
ninoderkinderen 0:8d87bc453349 1442 if (offset >= q->len) {
ninoderkinderen 0:8d87bc453349 1443 offset -= q->len;
ninoderkinderen 0:8d87bc453349 1444 offset_max -= q->len;
ninoderkinderen 0:8d87bc453349 1445 q = q->next;
ninoderkinderen 0:8d87bc453349 1446 options = (u8_t*)q->payload;
ninoderkinderen 0:8d87bc453349 1447 }
ninoderkinderen 0:8d87bc453349 1448 }
ninoderkinderen 0:8d87bc453349 1449 /* is this an overloaded message? */
ninoderkinderen 0:8d87bc453349 1450 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
ninoderkinderen 0:8d87bc453349 1451 u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
ninoderkinderen 0:8d87bc453349 1452 dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
ninoderkinderen 0:8d87bc453349 1453 if (overload == DHCP_OVERLOAD_FILE) {
ninoderkinderen 0:8d87bc453349 1454 parse_file_as_options = 1;
ninoderkinderen 0:8d87bc453349 1455 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
ninoderkinderen 0:8d87bc453349 1456 } else if (overload == DHCP_OVERLOAD_SNAME) {
ninoderkinderen 0:8d87bc453349 1457 parse_sname_as_options = 1;
ninoderkinderen 0:8d87bc453349 1458 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
ninoderkinderen 0:8d87bc453349 1459 } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
ninoderkinderen 0:8d87bc453349 1460 parse_sname_as_options = 1;
ninoderkinderen 0:8d87bc453349 1461 parse_file_as_options = 1;
ninoderkinderen 0:8d87bc453349 1462 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
ninoderkinderen 0:8d87bc453349 1463 } else {
ninoderkinderen 0:8d87bc453349 1464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
ninoderkinderen 0:8d87bc453349 1465 }
ninoderkinderen 0:8d87bc453349 1466 #if LWIP_DHCP_BOOTP_FILE
ninoderkinderen 0:8d87bc453349 1467 if (!parse_file_as_options) {
ninoderkinderen 0:8d87bc453349 1468 /* only do this for ACK messages */
ninoderkinderen 0:8d87bc453349 1469 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
ninoderkinderen 0:8d87bc453349 1470 (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
ninoderkinderen 0:8d87bc453349 1471 /* copy bootp file name, don't care for sname (server hostname) */
ninoderkinderen 0:8d87bc453349 1472 pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
ninoderkinderen 0:8d87bc453349 1473 /* make sure the string is really NULL-terminated */
ninoderkinderen 0:8d87bc453349 1474 dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
ninoderkinderen 0:8d87bc453349 1475 }
ninoderkinderen 0:8d87bc453349 1476 #endif /* LWIP_DHCP_BOOTP_FILE */
ninoderkinderen 0:8d87bc453349 1477 }
ninoderkinderen 0:8d87bc453349 1478 if (parse_file_as_options) {
ninoderkinderen 0:8d87bc453349 1479 /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
ninoderkinderen 0:8d87bc453349 1480 parse_file_as_options = 0;
ninoderkinderen 0:8d87bc453349 1481 options_idx = DHCP_FILE_OFS;
ninoderkinderen 0:8d87bc453349 1482 options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
ninoderkinderen 0:8d87bc453349 1483 goto again;
ninoderkinderen 0:8d87bc453349 1484 } else if (parse_sname_as_options) {
ninoderkinderen 0:8d87bc453349 1485 parse_sname_as_options = 0;
ninoderkinderen 0:8d87bc453349 1486 options_idx = DHCP_SNAME_OFS;
ninoderkinderen 0:8d87bc453349 1487 options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
ninoderkinderen 0:8d87bc453349 1488 goto again;
ninoderkinderen 0:8d87bc453349 1489 }
ninoderkinderen 0:8d87bc453349 1490 return ERR_OK;
ninoderkinderen 0:8d87bc453349 1491 }
ninoderkinderen 0:8d87bc453349 1492
ninoderkinderen 0:8d87bc453349 1493 /**
ninoderkinderen 0:8d87bc453349 1494 * If an incoming DHCP message is in response to us, then trigger the state machine
ninoderkinderen 0:8d87bc453349 1495 */
ninoderkinderen 0:8d87bc453349 1496 static void
ninoderkinderen 0:8d87bc453349 1497 dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
ninoderkinderen 0:8d87bc453349 1498 {
ninoderkinderen 0:8d87bc453349 1499 struct netif *netif = (struct netif *)arg;
ninoderkinderen 0:8d87bc453349 1500 struct dhcp *dhcp = netif->dhcp;
ninoderkinderen 0:8d87bc453349 1501 struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
ninoderkinderen 0:8d87bc453349 1502 u8_t msg_type;
ninoderkinderen 0:8d87bc453349 1503 u8_t i;
ninoderkinderen 0:8d87bc453349 1504 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_recv(pbuf = %p) from DHCP server %"U16_F".%"U16_F".%"U16_F".%"U16_F" port %"U16_F"\n", (void*)p,
ninoderkinderen 0:8d87bc453349 1505 ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
ninoderkinderen 0:8d87bc453349 1506 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
ninoderkinderen 0:8d87bc453349 1507 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
ninoderkinderen 0:8d87bc453349 1508 /* prevent warnings about unused arguments */
ninoderkinderen 0:8d87bc453349 1509 LWIP_UNUSED_ARG(pcb);
ninoderkinderen 0:8d87bc453349 1510 LWIP_UNUSED_ARG(addr);
ninoderkinderen 0:8d87bc453349 1511 LWIP_UNUSED_ARG(port);
ninoderkinderen 0:8d87bc453349 1512
ninoderkinderen 0:8d87bc453349 1513 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
ninoderkinderen 0:8d87bc453349 1514
ninoderkinderen 0:8d87bc453349 1515 if (p->len < DHCP_MIN_REPLY_LEN) {
ninoderkinderen 0:8d87bc453349 1516 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
ninoderkinderen 0:8d87bc453349 1517 goto free_pbuf_and_return;
ninoderkinderen 0:8d87bc453349 1518 }
ninoderkinderen 0:8d87bc453349 1519
ninoderkinderen 0:8d87bc453349 1520 if (reply_msg->op != DHCP_BOOTREPLY) {
ninoderkinderen 0:8d87bc453349 1521 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("not a DHCP reply message, but type %"U16_F"\n", (u16_t)reply_msg->op));
ninoderkinderen 0:8d87bc453349 1522 goto free_pbuf_and_return;
ninoderkinderen 0:8d87bc453349 1523 }
ninoderkinderen 0:8d87bc453349 1524 /* iterate through hardware address and match against DHCP message */
ninoderkinderen 0:8d87bc453349 1525 for (i = 0; i < netif->hwaddr_len; i++) {
ninoderkinderen 0:8d87bc453349 1526 if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
ninoderkinderen 0:8d87bc453349 1527 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
ninoderkinderen 0:8d87bc453349 1528 ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
ninoderkinderen 0:8d87bc453349 1529 (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
ninoderkinderen 0:8d87bc453349 1530 goto free_pbuf_and_return;
ninoderkinderen 0:8d87bc453349 1531 }
ninoderkinderen 0:8d87bc453349 1532 }
ninoderkinderen 0:8d87bc453349 1533 /* match transaction ID against what we expected */
ninoderkinderen 0:8d87bc453349 1534 if (ntohl(reply_msg->xid) != dhcp->xid) {
ninoderkinderen 0:8d87bc453349 1535 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
ninoderkinderen 0:8d87bc453349 1536 ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
ninoderkinderen 0:8d87bc453349 1537 goto free_pbuf_and_return;
ninoderkinderen 0:8d87bc453349 1538 }
ninoderkinderen 0:8d87bc453349 1539 /* option fields could be unfold? */
ninoderkinderen 0:8d87bc453349 1540 if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
ninoderkinderen 0:8d87bc453349 1541 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
ninoderkinderen 0:8d87bc453349 1542 ("problem unfolding DHCP message - too short on memory?\n"));
ninoderkinderen 0:8d87bc453349 1543 goto free_pbuf_and_return;
ninoderkinderen 0:8d87bc453349 1544 }
ninoderkinderen 0:8d87bc453349 1545
ninoderkinderen 0:8d87bc453349 1546 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
ninoderkinderen 0:8d87bc453349 1547 /* obtain pointer to DHCP message type */
ninoderkinderen 0:8d87bc453349 1548 if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
ninoderkinderen 0:8d87bc453349 1549 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
ninoderkinderen 0:8d87bc453349 1550 goto free_pbuf_and_return;
ninoderkinderen 0:8d87bc453349 1551 }
ninoderkinderen 0:8d87bc453349 1552
ninoderkinderen 0:8d87bc453349 1553 /* read DHCP message type */
ninoderkinderen 0:8d87bc453349 1554 msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
ninoderkinderen 0:8d87bc453349 1555 /* message type is DHCP ACK? */
ninoderkinderen 0:8d87bc453349 1556 if (msg_type == DHCP_ACK) {
ninoderkinderen 0:8d87bc453349 1557 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
ninoderkinderen 0:8d87bc453349 1558 /* in requesting state? */
ninoderkinderen 0:8d87bc453349 1559 if (dhcp->state == DHCP_REQUESTING) {
ninoderkinderen 0:8d87bc453349 1560 dhcp_handle_ack(netif);
ninoderkinderen 0:8d87bc453349 1561 #if DHCP_DOES_ARP_CHECK
ninoderkinderen 0:8d87bc453349 1562 /* check if the acknowledged lease address is already in use */
ninoderkinderen 0:8d87bc453349 1563 dhcp_check(netif);
ninoderkinderen 0:8d87bc453349 1564 #else
ninoderkinderen 0:8d87bc453349 1565 /* bind interface to the acknowledged lease address */
ninoderkinderen 0:8d87bc453349 1566 dhcp_bind(netif);
ninoderkinderen 0:8d87bc453349 1567 #endif
ninoderkinderen 0:8d87bc453349 1568 }
ninoderkinderen 0:8d87bc453349 1569 /* already bound to the given lease address? */
ninoderkinderen 0:8d87bc453349 1570 else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
ninoderkinderen 0:8d87bc453349 1571 dhcp_bind(netif);
ninoderkinderen 0:8d87bc453349 1572 }
ninoderkinderen 0:8d87bc453349 1573 }
ninoderkinderen 0:8d87bc453349 1574 /* received a DHCP_NAK in appropriate state? */
ninoderkinderen 0:8d87bc453349 1575 else if ((msg_type == DHCP_NAK) &&
ninoderkinderen 0:8d87bc453349 1576 ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
ninoderkinderen 0:8d87bc453349 1577 (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
ninoderkinderen 0:8d87bc453349 1578 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
ninoderkinderen 0:8d87bc453349 1579 dhcp_handle_nak(netif);
ninoderkinderen 0:8d87bc453349 1580 }
ninoderkinderen 0:8d87bc453349 1581 /* received a DHCP_OFFER in DHCP_SELECTING state? */
ninoderkinderen 0:8d87bc453349 1582 else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
ninoderkinderen 0:8d87bc453349 1583 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
ninoderkinderen 0:8d87bc453349 1584 dhcp->request_timeout = 0;
ninoderkinderen 0:8d87bc453349 1585 /* remember offered lease */
ninoderkinderen 0:8d87bc453349 1586 dhcp_handle_offer(netif);
ninoderkinderen 0:8d87bc453349 1587 }
ninoderkinderen 0:8d87bc453349 1588 free_pbuf_and_return:
ninoderkinderen 0:8d87bc453349 1589 dhcp->msg_in = NULL;
ninoderkinderen 0:8d87bc453349 1590 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 1591 }
ninoderkinderen 0:8d87bc453349 1592
ninoderkinderen 0:8d87bc453349 1593 /**
ninoderkinderen 0:8d87bc453349 1594 * Create a DHCP request, fill in common headers
ninoderkinderen 0:8d87bc453349 1595 *
ninoderkinderen 0:8d87bc453349 1596 * @param netif the netif under DHCP control
ninoderkinderen 0:8d87bc453349 1597 * @param dhcp dhcp control struct
ninoderkinderen 0:8d87bc453349 1598 * @param message_type message type of the request
ninoderkinderen 0:8d87bc453349 1599 */
ninoderkinderen 0:8d87bc453349 1600 static err_t
ninoderkinderen 0:8d87bc453349 1601 dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
ninoderkinderen 0:8d87bc453349 1602 {
ninoderkinderen 0:8d87bc453349 1603 u16_t i;
ninoderkinderen 0:8d87bc453349 1604 #ifndef DHCP_GLOBAL_XID
ninoderkinderen 0:8d87bc453349 1605 /** default global transaction identifier starting value (easy to match
ninoderkinderen 0:8d87bc453349 1606 * with a packet analyser). We simply increment for each new request.
ninoderkinderen 0:8d87bc453349 1607 * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
ninoderkinderen 0:8d87bc453349 1608 * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
ninoderkinderen 0:8d87bc453349 1609 static u32_t xid = 0xABCD0000;
ninoderkinderen 0:8d87bc453349 1610 #else
ninoderkinderen 0:8d87bc453349 1611 static u32_t xid;
ninoderkinderen 0:8d87bc453349 1612 static u8_t xid_initialised = 0;
ninoderkinderen 0:8d87bc453349 1613 if (!xid_initialised) {
ninoderkinderen 0:8d87bc453349 1614 xid = DHCP_GLOBAL_XID;
ninoderkinderen 0:8d87bc453349 1615 xid_initialised = !xid_initialised;
ninoderkinderen 0:8d87bc453349 1616 }
ninoderkinderen 0:8d87bc453349 1617 #endif
ninoderkinderen 0:8d87bc453349 1618 LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
ninoderkinderen 0:8d87bc453349 1619 LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
ninoderkinderen 0:8d87bc453349 1620 LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
ninoderkinderen 0:8d87bc453349 1621 LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
ninoderkinderen 0:8d87bc453349 1622 dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
ninoderkinderen 0:8d87bc453349 1623 if (dhcp->p_out == NULL) {
ninoderkinderen 0:8d87bc453349 1624 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
ninoderkinderen 0:8d87bc453349 1625 ("dhcp_create_msg(): could not allocate pbuf\n"));
ninoderkinderen 0:8d87bc453349 1626 return ERR_MEM;
ninoderkinderen 0:8d87bc453349 1627 }
ninoderkinderen 0:8d87bc453349 1628 LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
ninoderkinderen 0:8d87bc453349 1629 (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
ninoderkinderen 0:8d87bc453349 1630
ninoderkinderen 0:8d87bc453349 1631 /* reuse transaction identifier in retransmissions */
ninoderkinderen 0:8d87bc453349 1632 if (dhcp->tries == 0) {
ninoderkinderen 0:8d87bc453349 1633 xid++;
ninoderkinderen 0:8d87bc453349 1634 }
ninoderkinderen 0:8d87bc453349 1635 dhcp->xid = xid;
ninoderkinderen 0:8d87bc453349 1636 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
ninoderkinderen 0:8d87bc453349 1637 ("transaction id xid(%"X32_F")\n", xid));
ninoderkinderen 0:8d87bc453349 1638
ninoderkinderen 0:8d87bc453349 1639 dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
ninoderkinderen 0:8d87bc453349 1640
ninoderkinderen 0:8d87bc453349 1641 dhcp->msg_out->op = DHCP_BOOTREQUEST;
ninoderkinderen 0:8d87bc453349 1642 /* TODO: make link layer independent */
ninoderkinderen 0:8d87bc453349 1643 dhcp->msg_out->htype = DHCP_HTYPE_ETH;
ninoderkinderen 0:8d87bc453349 1644 dhcp->msg_out->hlen = netif->hwaddr_len;
ninoderkinderen 0:8d87bc453349 1645 dhcp->msg_out->hops = 0;
ninoderkinderen 0:8d87bc453349 1646 dhcp->msg_out->xid = htonl(dhcp->xid);
ninoderkinderen 0:8d87bc453349 1647 dhcp->msg_out->secs = 0;
ninoderkinderen 0:8d87bc453349 1648 /* we don't need the broadcast flag since we can receive unicast traffic
ninoderkinderen 0:8d87bc453349 1649 before being fully configured! */
ninoderkinderen 0:8d87bc453349 1650 dhcp->msg_out->flags = 0;
ninoderkinderen 0:8d87bc453349 1651 ip_addr_set_zero(&dhcp->msg_out->ciaddr);
ninoderkinderen 0:8d87bc453349 1652 /* set ciaddr to netif->ip_addr based on message_type and state */
ninoderkinderen 0:8d87bc453349 1653 if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
ninoderkinderen 0:8d87bc453349 1654 ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
ninoderkinderen 0:8d87bc453349 1655 ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
ninoderkinderen 0:8d87bc453349 1656 ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
ninoderkinderen 0:8d87bc453349 1657 }
ninoderkinderen 0:8d87bc453349 1658 ip_addr_set_zero(&dhcp->msg_out->yiaddr);
ninoderkinderen 0:8d87bc453349 1659 ip_addr_set_zero(&dhcp->msg_out->siaddr);
ninoderkinderen 0:8d87bc453349 1660 ip_addr_set_zero(&dhcp->msg_out->giaddr);
ninoderkinderen 0:8d87bc453349 1661 for (i = 0; i < DHCP_CHADDR_LEN; i++) {
ninoderkinderen 0:8d87bc453349 1662 /* copy netif hardware address, pad with zeroes */
ninoderkinderen 0:8d87bc453349 1663 dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
ninoderkinderen 0:8d87bc453349 1664 }
ninoderkinderen 0:8d87bc453349 1665 for (i = 0; i < DHCP_SNAME_LEN; i++) {
ninoderkinderen 0:8d87bc453349 1666 dhcp->msg_out->sname[i] = 0;
ninoderkinderen 0:8d87bc453349 1667 }
ninoderkinderen 0:8d87bc453349 1668 for (i = 0; i < DHCP_FILE_LEN; i++) {
ninoderkinderen 0:8d87bc453349 1669 dhcp->msg_out->file[i] = 0;
ninoderkinderen 0:8d87bc453349 1670 }
ninoderkinderen 0:8d87bc453349 1671 dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
ninoderkinderen 0:8d87bc453349 1672 dhcp->options_out_len = 0;
ninoderkinderen 0:8d87bc453349 1673 /* fill options field with an incrementing array (for debugging purposes) */
ninoderkinderen 0:8d87bc453349 1674 for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
ninoderkinderen 0:8d87bc453349 1675 dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
ninoderkinderen 0:8d87bc453349 1676 }
ninoderkinderen 0:8d87bc453349 1677 /* Add option MESSAGE_TYPE */
ninoderkinderen 0:8d87bc453349 1678 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
ninoderkinderen 0:8d87bc453349 1679 dhcp_option_byte(dhcp, message_type);
ninoderkinderen 0:8d87bc453349 1680 return ERR_OK;
ninoderkinderen 0:8d87bc453349 1681 }
ninoderkinderen 0:8d87bc453349 1682
ninoderkinderen 0:8d87bc453349 1683 /**
ninoderkinderen 0:8d87bc453349 1684 * Free previously allocated memory used to send a DHCP request.
ninoderkinderen 0:8d87bc453349 1685 *
ninoderkinderen 0:8d87bc453349 1686 * @param dhcp the dhcp struct to free the request from
ninoderkinderen 0:8d87bc453349 1687 */
ninoderkinderen 0:8d87bc453349 1688 static void
ninoderkinderen 0:8d87bc453349 1689 dhcp_delete_msg(struct dhcp *dhcp)
ninoderkinderen 0:8d87bc453349 1690 {
ninoderkinderen 0:8d87bc453349 1691 LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
ninoderkinderen 0:8d87bc453349 1692 LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
ninoderkinderen 0:8d87bc453349 1693 LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
ninoderkinderen 0:8d87bc453349 1694 if (dhcp->p_out != NULL) {
ninoderkinderen 0:8d87bc453349 1695 pbuf_free(dhcp->p_out);
ninoderkinderen 0:8d87bc453349 1696 }
ninoderkinderen 0:8d87bc453349 1697 dhcp->p_out = NULL;
ninoderkinderen 0:8d87bc453349 1698 dhcp->msg_out = NULL;
ninoderkinderen 0:8d87bc453349 1699 }
ninoderkinderen 0:8d87bc453349 1700
ninoderkinderen 0:8d87bc453349 1701 /**
ninoderkinderen 0:8d87bc453349 1702 * Add a DHCP message trailer
ninoderkinderen 0:8d87bc453349 1703 *
ninoderkinderen 0:8d87bc453349 1704 * Adds the END option to the DHCP message, and if
ninoderkinderen 0:8d87bc453349 1705 * necessary, up to three padding bytes.
ninoderkinderen 0:8d87bc453349 1706 *
ninoderkinderen 0:8d87bc453349 1707 * @param dhcp DHCP state structure
ninoderkinderen 0:8d87bc453349 1708 */
ninoderkinderen 0:8d87bc453349 1709 static void
ninoderkinderen 0:8d87bc453349 1710 dhcp_option_trailer(struct dhcp *dhcp)
ninoderkinderen 0:8d87bc453349 1711 {
ninoderkinderen 0:8d87bc453349 1712 LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
ninoderkinderen 0:8d87bc453349 1713 LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
ninoderkinderen 0:8d87bc453349 1714 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
ninoderkinderen 0:8d87bc453349 1715 dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
ninoderkinderen 0:8d87bc453349 1716 /* packet is too small, or not 4 byte aligned? */
ninoderkinderen 0:8d87bc453349 1717 while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
ninoderkinderen 0:8d87bc453349 1718 /* LWIP_DEBUGF(DHCP_DEBUG,("dhcp_option_trailer:dhcp->options_out_len=%"U16_F", DHCP_OPTIONS_LEN=%"U16_F, dhcp->options_out_len, DHCP_OPTIONS_LEN)); */
ninoderkinderen 0:8d87bc453349 1719 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
ninoderkinderen 0:8d87bc453349 1720 /* add a fill/padding byte */
ninoderkinderen 0:8d87bc453349 1721 dhcp->msg_out->options[dhcp->options_out_len++] = 0;
ninoderkinderen 0:8d87bc453349 1722 }
ninoderkinderen 0:8d87bc453349 1723 }
ninoderkinderen 0:8d87bc453349 1724
ninoderkinderen 0:8d87bc453349 1725 #endif /* LWIP_DHCP */