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NetServices/lwip/core/dhcp.c@0:4edb816d21e1, 2015-10-16 (annotated)

Committer:
ICTFBI
Date:
Fri Oct 16 14:28:26 2015 +0000
Revision:
0:4edb816d21e1
Pre-update 16-10-15

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ICTFBI 0:4edb816d21e1 1 /**
ICTFBI 0:4edb816d21e1 2 * @file
ICTFBI 0:4edb816d21e1 3 * Dynamic Host Configuration Protocol client
ICTFBI 0:4edb816d21e1 4 *
ICTFBI 0:4edb816d21e1 5 */
ICTFBI 0:4edb816d21e1 6
ICTFBI 0:4edb816d21e1 7 /*
ICTFBI 0:4edb816d21e1 8 *
ICTFBI 0:4edb816d21e1 9 * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
ICTFBI 0:4edb816d21e1 10 * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
ICTFBI 0:4edb816d21e1 11 * All rights reserved.
ICTFBI 0:4edb816d21e1 12 *
ICTFBI 0:4edb816d21e1 13 * Redistribution and use in source and binary forms, with or without modification,
ICTFBI 0:4edb816d21e1 14 * are permitted provided that the following conditions are met:
ICTFBI 0:4edb816d21e1 15 *
ICTFBI 0:4edb816d21e1 16 * 1. Redistributions of source code must retain the above copyright notice,
ICTFBI 0:4edb816d21e1 17 * this list of conditions and the following disclaimer.
ICTFBI 0:4edb816d21e1 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
ICTFBI 0:4edb816d21e1 19 * this list of conditions and the following disclaimer in the documentation
ICTFBI 0:4edb816d21e1 20 * and/or other materials provided with the distribution.
ICTFBI 0:4edb816d21e1 21 * 3. The name of the author may not be used to endorse or promote products
ICTFBI 0:4edb816d21e1 22 * derived from this software without specific prior written permission.
ICTFBI 0:4edb816d21e1 23 *
ICTFBI 0:4edb816d21e1 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
ICTFBI 0:4edb816d21e1 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
ICTFBI 0:4edb816d21e1 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
ICTFBI 0:4edb816d21e1 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
ICTFBI 0:4edb816d21e1 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
ICTFBI 0:4edb816d21e1 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
ICTFBI 0:4edb816d21e1 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
ICTFBI 0:4edb816d21e1 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
ICTFBI 0:4edb816d21e1 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
ICTFBI 0:4edb816d21e1 33 * OF SUCH DAMAGE.
ICTFBI 0:4edb816d21e1 34 *
ICTFBI 0:4edb816d21e1 35 * This file is a contribution to the lwIP TCP/IP stack.
ICTFBI 0:4edb816d21e1 36 * The Swedish Institute of Computer Science and Adam Dunkels
ICTFBI 0:4edb816d21e1 37 * are specifically granted permission to redistribute this
ICTFBI 0:4edb816d21e1 38 * source code.
ICTFBI 0:4edb816d21e1 39 *
ICTFBI 0:4edb816d21e1 40 * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
ICTFBI 0:4edb816d21e1 41 *
ICTFBI 0:4edb816d21e1 42 * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
ICTFBI 0:4edb816d21e1 43 * with RFC 2131 and RFC 2132.
ICTFBI 0:4edb816d21e1 44 *
ICTFBI 0:4edb816d21e1 45 * TODO:
ICTFBI 0:4edb816d21e1 46 * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
ICTFBI 0:4edb816d21e1 47 *
ICTFBI 0:4edb816d21e1 48 * Please coordinate changes and requests with Leon Woestenberg
ICTFBI 0:4edb816d21e1 49 * <leon.woestenberg@gmx.net>
ICTFBI 0:4edb816d21e1 50 *
ICTFBI 0:4edb816d21e1 51 * Integration with your code:
ICTFBI 0:4edb816d21e1 52 *
ICTFBI 0:4edb816d21e1 53 * In lwip/dhcp.h
ICTFBI 0:4edb816d21e1 54 * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
ICTFBI 0:4edb816d21e1 55 * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
ICTFBI 0:4edb816d21e1 56 *
ICTFBI 0:4edb816d21e1 57 * Then have your application call dhcp_coarse_tmr() and
ICTFBI 0:4edb816d21e1 58 * dhcp_fine_tmr() on the defined intervals.
ICTFBI 0:4edb816d21e1 59 *
ICTFBI 0:4edb816d21e1 60 * dhcp_start(struct netif *netif);
ICTFBI 0:4edb816d21e1 61 * starts a DHCP client instance which configures the interface by
ICTFBI 0:4edb816d21e1 62 * obtaining an IP address lease and maintaining it.
ICTFBI 0:4edb816d21e1 63 *
ICTFBI 0:4edb816d21e1 64 * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
ICTFBI 0:4edb816d21e1 65 * to remove the DHCP client.
ICTFBI 0:4edb816d21e1 66 *
ICTFBI 0:4edb816d21e1 67 */
ICTFBI 0:4edb816d21e1 68
ICTFBI 0:4edb816d21e1 69 #include "lwip/opt.h"
ICTFBI 0:4edb816d21e1 70
ICTFBI 0:4edb816d21e1 71 #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
ICTFBI 0:4edb816d21e1 72
ICTFBI 0:4edb816d21e1 73 #include "lwip/stats.h"
ICTFBI 0:4edb816d21e1 74 #include "lwip/mem.h"
ICTFBI 0:4edb816d21e1 75 #include "lwip/udp.h"
ICTFBI 0:4edb816d21e1 76 #include "lwip/ip_addr.h"
ICTFBI 0:4edb816d21e1 77 #include "lwip/netif.h"
ICTFBI 0:4edb816d21e1 78 #include "lwip/def.h"
ICTFBI 0:4edb816d21e1 79 #include "lwip/sys.h"
ICTFBI 0:4edb816d21e1 80 #include "lwip/dhcp.h"
ICTFBI 0:4edb816d21e1 81 #include "lwip/autoip.h"
ICTFBI 0:4edb816d21e1 82 #include "lwip/dns.h"
ICTFBI 0:4edb816d21e1 83 #include "netif/etharp.h"
ICTFBI 0:4edb816d21e1 84
ICTFBI 0:4edb816d21e1 85 #include <string.h>
ICTFBI 0:4edb816d21e1 86
ICTFBI 0:4edb816d21e1 87 /** Default for DHCP_GLOBAL_XID is 0xABCD0000
ICTFBI 0:4edb816d21e1 88 * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
ICTFBI 0:4edb816d21e1 89 * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
ICTFBI 0:4edb816d21e1 90 * #define DHCP_GLOBAL_XID rand()
ICTFBI 0:4edb816d21e1 91 */
ICTFBI 0:4edb816d21e1 92 #ifdef DHCP_GLOBAL_XID_HEADER
ICTFBI 0:4edb816d21e1 93 #include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
ICTFBI 0:4edb816d21e1 94 #endif
ICTFBI 0:4edb816d21e1 95
ICTFBI 0:4edb816d21e1 96 /** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
ICTFBI 0:4edb816d21e1 97 * MTU is checked to be big enough in dhcp_start */
ICTFBI 0:4edb816d21e1 98 #define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
ICTFBI 0:4edb816d21e1 99 #define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
ICTFBI 0:4edb816d21e1 100 /** Minimum length for reply before packet is parsed */
ICTFBI 0:4edb816d21e1 101 #define DHCP_MIN_REPLY_LEN 44
ICTFBI 0:4edb816d21e1 102
ICTFBI 0:4edb816d21e1 103 #define REBOOT_TRIES 2
ICTFBI 0:4edb816d21e1 104
ICTFBI 0:4edb816d21e1 105 /** Option handling: options are parsed in dhcp_parse_reply
ICTFBI 0:4edb816d21e1 106 * and saved in an array where other functions can load them from.
ICTFBI 0:4edb816d21e1 107 * This might be moved into the struct dhcp (not necessarily since
ICTFBI 0:4edb816d21e1 108 * lwIP is single-threaded and the array is only used while in recv
ICTFBI 0:4edb816d21e1 109 * callback). */
ICTFBI 0:4edb816d21e1 110 #define DHCP_OPTION_IDX_OVERLOAD 0
ICTFBI 0:4edb816d21e1 111 #define DHCP_OPTION_IDX_MSG_TYPE 1
ICTFBI 0:4edb816d21e1 112 #define DHCP_OPTION_IDX_SERVER_ID 2
ICTFBI 0:4edb816d21e1 113 #define DHCP_OPTION_IDX_LEASE_TIME 3
ICTFBI 0:4edb816d21e1 114 #define DHCP_OPTION_IDX_T1 4
ICTFBI 0:4edb816d21e1 115 #define DHCP_OPTION_IDX_T2 5
ICTFBI 0:4edb816d21e1 116 #define DHCP_OPTION_IDX_SUBNET_MASK 6
ICTFBI 0:4edb816d21e1 117 #define DHCP_OPTION_IDX_ROUTER 7
ICTFBI 0:4edb816d21e1 118 #define DHCP_OPTION_IDX_DNS_SERVER 8
ICTFBI 0:4edb816d21e1 119 #define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
ICTFBI 0:4edb816d21e1 120
ICTFBI 0:4edb816d21e1 121 /** Holds the decoded option values, only valid while in dhcp_recv.
ICTFBI 0:4edb816d21e1 122 @todo: move this into struct dhcp? */
ICTFBI 0:4edb816d21e1 123 u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
ICTFBI 0:4edb816d21e1 124 /** Holds a flag which option was received and is contained in dhcp_rx_options_val,
ICTFBI 0:4edb816d21e1 125 only valid while in dhcp_recv.
ICTFBI 0:4edb816d21e1 126 @todo: move this into struct dhcp? */
ICTFBI 0:4edb816d21e1 127 u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
ICTFBI 0:4edb816d21e1 128
ICTFBI 0:4edb816d21e1 129 #define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
ICTFBI 0:4edb816d21e1 130 #define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
ICTFBI 0:4edb816d21e1 131 #define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
ICTFBI 0:4edb816d21e1 132 #define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
ICTFBI 0:4edb816d21e1 133 #define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
ICTFBI 0:4edb816d21e1 134 #define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
ICTFBI 0:4edb816d21e1 135
ICTFBI 0:4edb816d21e1 136
ICTFBI 0:4edb816d21e1 137 /* DHCP client state machine functions */
ICTFBI 0:4edb816d21e1 138 static err_t dhcp_discover(struct netif *netif);
ICTFBI 0:4edb816d21e1 139 static err_t dhcp_select(struct netif *netif);
ICTFBI 0:4edb816d21e1 140 static void dhcp_bind(struct netif *netif);
ICTFBI 0:4edb816d21e1 141 #if DHCP_DOES_ARP_CHECK
ICTFBI 0:4edb816d21e1 142 static err_t dhcp_decline(struct netif *netif);
ICTFBI 0:4edb816d21e1 143 #endif /* DHCP_DOES_ARP_CHECK */
ICTFBI 0:4edb816d21e1 144 static err_t dhcp_rebind(struct netif *netif);
ICTFBI 0:4edb816d21e1 145 static err_t dhcp_reboot(struct netif *netif);
ICTFBI 0:4edb816d21e1 146 static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
ICTFBI 0:4edb816d21e1 147
ICTFBI 0:4edb816d21e1 148 /* receive, unfold, parse and free incoming messages */
ICTFBI 0:4edb816d21e1 149 static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
ICTFBI 0:4edb816d21e1 150
ICTFBI 0:4edb816d21e1 151 /* set the DHCP timers */
ICTFBI 0:4edb816d21e1 152 static void dhcp_timeout(struct netif *netif);
ICTFBI 0:4edb816d21e1 153 static void dhcp_t1_timeout(struct netif *netif);
ICTFBI 0:4edb816d21e1 154 static void dhcp_t2_timeout(struct netif *netif);
ICTFBI 0:4edb816d21e1 155
ICTFBI 0:4edb816d21e1 156 /* build outgoing messages */
ICTFBI 0:4edb816d21e1 157 /* create a DHCP message, fill in common headers */
ICTFBI 0:4edb816d21e1 158 static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
ICTFBI 0:4edb816d21e1 159 /* free a DHCP request */
ICTFBI 0:4edb816d21e1 160 static void dhcp_delete_msg(struct dhcp *dhcp);
ICTFBI 0:4edb816d21e1 161 /* add a DHCP option (type, then length in bytes) */
ICTFBI 0:4edb816d21e1 162 static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
ICTFBI 0:4edb816d21e1 163 /* add option values */
ICTFBI 0:4edb816d21e1 164 static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
ICTFBI 0:4edb816d21e1 165 static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
ICTFBI 0:4edb816d21e1 166 static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
ICTFBI 0:4edb816d21e1 167 /* always add the DHCP options trailer to end and pad */
ICTFBI 0:4edb816d21e1 168 static void dhcp_option_trailer(struct dhcp *dhcp);
ICTFBI 0:4edb816d21e1 169
ICTFBI 0:4edb816d21e1 170 /**
ICTFBI 0:4edb816d21e1 171 * Back-off the DHCP client (because of a received NAK response).
ICTFBI 0:4edb816d21e1 172 *
ICTFBI 0:4edb816d21e1 173 * Back-off the DHCP client because of a received NAK. Receiving a
ICTFBI 0:4edb816d21e1 174 * NAK means the client asked for something non-sensible, for
ICTFBI 0:4edb816d21e1 175 * example when it tries to renew a lease obtained on another network.
ICTFBI 0:4edb816d21e1 176 *
ICTFBI 0:4edb816d21e1 177 * We clear any existing set IP address and restart DHCP negotiation
ICTFBI 0:4edb816d21e1 178 * afresh (as per RFC2131 3.2.3).
ICTFBI 0:4edb816d21e1 179 *
ICTFBI 0:4edb816d21e1 180 * @param netif the netif under DHCP control
ICTFBI 0:4edb816d21e1 181 */
ICTFBI 0:4edb816d21e1 182 static void
ICTFBI 0:4edb816d21e1 183 dhcp_handle_nak(struct netif *netif)
ICTFBI 0:4edb816d21e1 184 {
ICTFBI 0:4edb816d21e1 185 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
ICTFBI 0:4edb816d21e1 187 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
ICTFBI 0:4edb816d21e1 188 /* Set the interface down since the address must no longer be used, as per RFC2131 */
ICTFBI 0:4edb816d21e1 189 netif_set_down(netif);
ICTFBI 0:4edb816d21e1 190 /* remove IP address from interface */
ICTFBI 0:4edb816d21e1 191 netif_set_ipaddr(netif, IP_ADDR_ANY);
ICTFBI 0:4edb816d21e1 192 netif_set_gw(netif, IP_ADDR_ANY);
ICTFBI 0:4edb816d21e1 193 netif_set_netmask(netif, IP_ADDR_ANY);
ICTFBI 0:4edb816d21e1 194 /* Change to a defined state */
ICTFBI 0:4edb816d21e1 195 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
ICTFBI 0:4edb816d21e1 196 /* We can immediately restart discovery */
ICTFBI 0:4edb816d21e1 197 dhcp_discover(netif);
ICTFBI 0:4edb816d21e1 198 }
ICTFBI 0:4edb816d21e1 199
ICTFBI 0:4edb816d21e1 200 #if DHCP_DOES_ARP_CHECK
ICTFBI 0:4edb816d21e1 201 /**
ICTFBI 0:4edb816d21e1 202 * Checks if the offered IP address is already in use.
ICTFBI 0:4edb816d21e1 203 *
ICTFBI 0:4edb816d21e1 204 * It does so by sending an ARP request for the offered address and
ICTFBI 0:4edb816d21e1 205 * entering CHECKING state. If no ARP reply is received within a small
ICTFBI 0:4edb816d21e1 206 * interval, the address is assumed to be free for use by us.
ICTFBI 0:4edb816d21e1 207 *
ICTFBI 0:4edb816d21e1 208 * @param netif the netif under DHCP control
ICTFBI 0:4edb816d21e1 209 */
ICTFBI 0:4edb816d21e1 210 static void
ICTFBI 0:4edb816d21e1 211 dhcp_check(struct netif *netif)
ICTFBI 0:4edb816d21e1 212 {
ICTFBI 0:4edb816d21e1 213 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 214 err_t result;
ICTFBI 0:4edb816d21e1 215 u16_t msecs;
ICTFBI 0:4edb816d21e1 216 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
ICTFBI 0:4edb816d21e1 217 (s16_t)netif->name[1]));
ICTFBI 0:4edb816d21e1 218 dhcp_set_state(dhcp, DHCP_CHECKING);
ICTFBI 0:4edb816d21e1 219 /* create an ARP query for the offered IP address, expecting that no host
ICTFBI 0:4edb816d21e1 220 responds, as the IP address should not be in use. */
ICTFBI 0:4edb816d21e1 221 result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
ICTFBI 0:4edb816d21e1 222 if (result != ERR_OK) {
ICTFBI 0:4edb816d21e1 223 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
ICTFBI 0:4edb816d21e1 224 }
ICTFBI 0:4edb816d21e1 225 dhcp->tries++;
ICTFBI 0:4edb816d21e1 226 msecs = 500;
ICTFBI 0:4edb816d21e1 227 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ICTFBI 0:4edb816d21e1 228 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
ICTFBI 0:4edb816d21e1 229 }
ICTFBI 0:4edb816d21e1 230 #endif /* DHCP_DOES_ARP_CHECK */
ICTFBI 0:4edb816d21e1 231
ICTFBI 0:4edb816d21e1 232 /**
ICTFBI 0:4edb816d21e1 233 * Remember the configuration offered by a DHCP server.
ICTFBI 0:4edb816d21e1 234 *
ICTFBI 0:4edb816d21e1 235 * @param netif the netif under DHCP control
ICTFBI 0:4edb816d21e1 236 */
ICTFBI 0:4edb816d21e1 237 static void
ICTFBI 0:4edb816d21e1 238 dhcp_handle_offer(struct netif *netif)
ICTFBI 0:4edb816d21e1 239 {
ICTFBI 0:4edb816d21e1 240 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 241 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
ICTFBI 0:4edb816d21e1 242 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
ICTFBI 0:4edb816d21e1 243 /* obtain the server address */
ICTFBI 0:4edb816d21e1 244 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
ICTFBI 0:4edb816d21e1 245 ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
ICTFBI 0:4edb816d21e1 246 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
ICTFBI 0:4edb816d21e1 247 ip4_addr_get_u32(&dhcp->server_ip_addr)));
ICTFBI 0:4edb816d21e1 248 /* remember offered address */
ICTFBI 0:4edb816d21e1 249 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
ICTFBI 0:4edb816d21e1 250 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
ICTFBI 0:4edb816d21e1 251 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
ICTFBI 0:4edb816d21e1 252
ICTFBI 0:4edb816d21e1 253 dhcp_select(netif);
ICTFBI 0:4edb816d21e1 254 } else {
ICTFBI 0:4edb816d21e1 255 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
ICTFBI 0:4edb816d21e1 256 ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
ICTFBI 0:4edb816d21e1 257 }
ICTFBI 0:4edb816d21e1 258 }
ICTFBI 0:4edb816d21e1 259
ICTFBI 0:4edb816d21e1 260 /**
ICTFBI 0:4edb816d21e1 261 * Select a DHCP server offer out of all offers.
ICTFBI 0:4edb816d21e1 262 *
ICTFBI 0:4edb816d21e1 263 * Simply select the first offer received.
ICTFBI 0:4edb816d21e1 264 *
ICTFBI 0:4edb816d21e1 265 * @param netif the netif under DHCP control
ICTFBI 0:4edb816d21e1 266 * @return lwIP specific error (see error.h)
ICTFBI 0:4edb816d21e1 267 */
ICTFBI 0:4edb816d21e1 268 static err_t
ICTFBI 0:4edb816d21e1 269 dhcp_select(struct netif *netif)
ICTFBI 0:4edb816d21e1 270 {
ICTFBI 0:4edb816d21e1 271 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 272 err_t result;
ICTFBI 0:4edb816d21e1 273 u16_t msecs;
ICTFBI 0:4edb816d21e1 274
ICTFBI 0:4edb816d21e1 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));
ICTFBI 0:4edb816d21e1 276 dhcp_set_state(dhcp, DHCP_REQUESTING);
ICTFBI 0:4edb816d21e1 277
ICTFBI 0:4edb816d21e1 278 /* create and initialize the DHCP message header */
ICTFBI 0:4edb816d21e1 279 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
ICTFBI 0:4edb816d21e1 280 if (result == ERR_OK) {
ICTFBI 0:4edb816d21e1 281 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
ICTFBI 0:4edb816d21e1 282 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
ICTFBI 0:4edb816d21e1 283
ICTFBI 0:4edb816d21e1 284 /* MUST request the offered IP address */
ICTFBI 0:4edb816d21e1 285 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
ICTFBI 0:4edb816d21e1 286 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
ICTFBI 0:4edb816d21e1 287
ICTFBI 0:4edb816d21e1 288 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
ICTFBI 0:4edb816d21e1 289 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
ICTFBI 0:4edb816d21e1 290
ICTFBI 0:4edb816d21e1 291 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
ICTFBI 0:4edb816d21e1 292 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
ICTFBI 0:4edb816d21e1 293 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
ICTFBI 0:4edb816d21e1 294 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
ICTFBI 0:4edb816d21e1 295 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
ICTFBI 0:4edb816d21e1 296
ICTFBI 0:4edb816d21e1 297 #if LWIP_NETIF_HOSTNAME
ICTFBI 0:4edb816d21e1 298 if (netif->hostname != NULL) {
ICTFBI 0:4edb816d21e1 299 const char *p = (const char*)netif->hostname;
ICTFBI 0:4edb816d21e1 300 u8_t namelen = (u8_t)strlen(p);
ICTFBI 0:4edb816d21e1 301 if (namelen > 0) {
ICTFBI 0:4edb816d21e1 302 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
ICTFBI 0:4edb816d21e1 303 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
ICTFBI 0:4edb816d21e1 304 while (*p) {
ICTFBI 0:4edb816d21e1 305 dhcp_option_byte(dhcp, *p++);
ICTFBI 0:4edb816d21e1 306 }
ICTFBI 0:4edb816d21e1 307 }
ICTFBI 0:4edb816d21e1 308 }
ICTFBI 0:4edb816d21e1 309 #endif /* LWIP_NETIF_HOSTNAME */
ICTFBI 0:4edb816d21e1 310
ICTFBI 0:4edb816d21e1 311 dhcp_option_trailer(dhcp);
ICTFBI 0:4edb816d21e1 312 /* shrink the pbuf to the actual content length */
ICTFBI 0:4edb816d21e1 313 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ICTFBI 0:4edb816d21e1 314
ICTFBI 0:4edb816d21e1 315 /* send broadcast to any DHCP server */
ICTFBI 0:4edb816d21e1 316 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
ICTFBI 0:4edb816d21e1 317 dhcp_delete_msg(dhcp);
ICTFBI 0:4edb816d21e1 318 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
ICTFBI 0:4edb816d21e1 319 } else {
ICTFBI 0:4edb816d21e1 320 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
ICTFBI 0:4edb816d21e1 321 }
ICTFBI 0:4edb816d21e1 322 dhcp->tries++;
ICTFBI 0:4edb816d21e1 323 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
ICTFBI 0:4edb816d21e1 324 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ICTFBI 0:4edb816d21e1 325 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
ICTFBI 0:4edb816d21e1 326 return result;
ICTFBI 0:4edb816d21e1 327 }
ICTFBI 0:4edb816d21e1 328
ICTFBI 0:4edb816d21e1 329 /**
ICTFBI 0:4edb816d21e1 330 * The DHCP timer that checks for lease renewal/rebind timeouts.
ICTFBI 0:4edb816d21e1 331 */
ICTFBI 0:4edb816d21e1 332 void
ICTFBI 0:4edb816d21e1 333 dhcp_coarse_tmr()
ICTFBI 0:4edb816d21e1 334 {
ICTFBI 0:4edb816d21e1 335 struct netif *netif = netif_list;
ICTFBI 0:4edb816d21e1 336 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
ICTFBI 0:4edb816d21e1 337 /* iterate through all network interfaces */
ICTFBI 0:4edb816d21e1 338 while (netif != NULL) {
ICTFBI 0:4edb816d21e1 339 /* only act on DHCP configured interfaces */
ICTFBI 0:4edb816d21e1 340 if (netif->dhcp != NULL) {
ICTFBI 0:4edb816d21e1 341 /* timer is active (non zero), and triggers (zeroes) now? */
ICTFBI 0:4edb816d21e1 342 if (netif->dhcp->t2_timeout-- == 1) {
ICTFBI 0:4edb816d21e1 343 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
ICTFBI 0:4edb816d21e1 344 /* this clients' rebind timeout triggered */
ICTFBI 0:4edb816d21e1 345 dhcp_t2_timeout(netif);
ICTFBI 0:4edb816d21e1 346 /* timer is active (non zero), and triggers (zeroes) now */
ICTFBI 0:4edb816d21e1 347 } else if (netif->dhcp->t1_timeout-- == 1) {
ICTFBI 0:4edb816d21e1 348 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
ICTFBI 0:4edb816d21e1 349 /* this clients' renewal timeout triggered */
ICTFBI 0:4edb816d21e1 350 dhcp_t1_timeout(netif);
ICTFBI 0:4edb816d21e1 351 }
ICTFBI 0:4edb816d21e1 352 }
ICTFBI 0:4edb816d21e1 353 /* proceed to next netif */
ICTFBI 0:4edb816d21e1 354 netif = netif->next;
ICTFBI 0:4edb816d21e1 355 }
ICTFBI 0:4edb816d21e1 356 }
ICTFBI 0:4edb816d21e1 357
ICTFBI 0:4edb816d21e1 358 /**
ICTFBI 0:4edb816d21e1 359 * DHCP transaction timeout handling
ICTFBI 0:4edb816d21e1 360 *
ICTFBI 0:4edb816d21e1 361 * A DHCP server is expected to respond within a short period of time.
ICTFBI 0:4edb816d21e1 362 * This timer checks whether an outstanding DHCP request is timed out.
ICTFBI 0:4edb816d21e1 363 */
ICTFBI 0:4edb816d21e1 364 void
ICTFBI 0:4edb816d21e1 365 dhcp_fine_tmr()
ICTFBI 0:4edb816d21e1 366 {
ICTFBI 0:4edb816d21e1 367 struct netif *netif = netif_list;
ICTFBI 0:4edb816d21e1 368 /* loop through netif's */
ICTFBI 0:4edb816d21e1 369 while (netif != NULL) {
ICTFBI 0:4edb816d21e1 370 /* only act on DHCP configured interfaces */
ICTFBI 0:4edb816d21e1 371 if (netif->dhcp != NULL) {
ICTFBI 0:4edb816d21e1 372 /* timer is active (non zero), and is about to trigger now */
ICTFBI 0:4edb816d21e1 373 if (netif->dhcp->request_timeout > 1) {
ICTFBI 0:4edb816d21e1 374 netif->dhcp->request_timeout--;
ICTFBI 0:4edb816d21e1 375 }
ICTFBI 0:4edb816d21e1 376 else if (netif->dhcp->request_timeout == 1) {
ICTFBI 0:4edb816d21e1 377 netif->dhcp->request_timeout--;
ICTFBI 0:4edb816d21e1 378 /* { netif->dhcp->request_timeout == 0 } */
ICTFBI 0:4edb816d21e1 379 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
ICTFBI 0:4edb816d21e1 380 /* this client's request timeout triggered */
ICTFBI 0:4edb816d21e1 381 dhcp_timeout(netif);
ICTFBI 0:4edb816d21e1 382 }
ICTFBI 0:4edb816d21e1 383 }
ICTFBI 0:4edb816d21e1 384 /* proceed to next network interface */
ICTFBI 0:4edb816d21e1 385 netif = netif->next;
ICTFBI 0:4edb816d21e1 386 }
ICTFBI 0:4edb816d21e1 387 }
ICTFBI 0:4edb816d21e1 388
ICTFBI 0:4edb816d21e1 389 /**
ICTFBI 0:4edb816d21e1 390 * A DHCP negotiation transaction, or ARP request, has timed out.
ICTFBI 0:4edb816d21e1 391 *
ICTFBI 0:4edb816d21e1 392 * The timer that was started with the DHCP or ARP request has
ICTFBI 0:4edb816d21e1 393 * timed out, indicating no response was received in time.
ICTFBI 0:4edb816d21e1 394 *
ICTFBI 0:4edb816d21e1 395 * @param netif the netif under DHCP control
ICTFBI 0:4edb816d21e1 396 */
ICTFBI 0:4edb816d21e1 397 static void
ICTFBI 0:4edb816d21e1 398 dhcp_timeout(struct netif *netif)
ICTFBI 0:4edb816d21e1 399 {
ICTFBI 0:4edb816d21e1 400 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 401 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
ICTFBI 0:4edb816d21e1 402 /* back-off period has passed, or server selection timed out */
ICTFBI 0:4edb816d21e1 403 if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
ICTFBI 0:4edb816d21e1 404 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
ICTFBI 0:4edb816d21e1 405 dhcp_discover(netif);
ICTFBI 0:4edb816d21e1 406 /* receiving the requested lease timed out */
ICTFBI 0:4edb816d21e1 407 } else if (dhcp->state == DHCP_REQUESTING) {
ICTFBI 0:4edb816d21e1 408 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
ICTFBI 0:4edb816d21e1 409 if (dhcp->tries <= 5) {
ICTFBI 0:4edb816d21e1 410 dhcp_select(netif);
ICTFBI 0:4edb816d21e1 411 } else {
ICTFBI 0:4edb816d21e1 412 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
ICTFBI 0:4edb816d21e1 413 dhcp_release(netif);
ICTFBI 0:4edb816d21e1 414 dhcp_discover(netif);
ICTFBI 0:4edb816d21e1 415 }
ICTFBI 0:4edb816d21e1 416 #if DHCP_DOES_ARP_CHECK
ICTFBI 0:4edb816d21e1 417 /* received no ARP reply for the offered address (which is good) */
ICTFBI 0:4edb816d21e1 418 } else if (dhcp->state == DHCP_CHECKING) {
ICTFBI 0:4edb816d21e1 419 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
ICTFBI 0:4edb816d21e1 420 if (dhcp->tries <= 1) {
ICTFBI 0:4edb816d21e1 421 dhcp_check(netif);
ICTFBI 0:4edb816d21e1 422 /* no ARP replies on the offered address,
ICTFBI 0:4edb816d21e1 423 looks like the IP address is indeed free */
ICTFBI 0:4edb816d21e1 424 } else {
ICTFBI 0:4edb816d21e1 425 /* bind the interface to the offered address */
ICTFBI 0:4edb816d21e1 426 dhcp_bind(netif);
ICTFBI 0:4edb816d21e1 427 }
ICTFBI 0:4edb816d21e1 428 #endif /* DHCP_DOES_ARP_CHECK */
ICTFBI 0:4edb816d21e1 429 }
ICTFBI 0:4edb816d21e1 430 /* did not get response to renew request? */
ICTFBI 0:4edb816d21e1 431 else if (dhcp->state == DHCP_RENEWING) {
ICTFBI 0:4edb816d21e1 432 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
ICTFBI 0:4edb816d21e1 433 /* just retry renewal */
ICTFBI 0:4edb816d21e1 434 /* note that the rebind timer will eventually time-out if renew does not work */
ICTFBI 0:4edb816d21e1 435 dhcp_renew(netif);
ICTFBI 0:4edb816d21e1 436 /* did not get response to rebind request? */
ICTFBI 0:4edb816d21e1 437 } else if (dhcp->state == DHCP_REBINDING) {
ICTFBI 0:4edb816d21e1 438 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
ICTFBI 0:4edb816d21e1 439 if (dhcp->tries <= 8) {
ICTFBI 0:4edb816d21e1 440 dhcp_rebind(netif);
ICTFBI 0:4edb816d21e1 441 } else {
ICTFBI 0:4edb816d21e1 442 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
ICTFBI 0:4edb816d21e1 443 dhcp_release(netif);
ICTFBI 0:4edb816d21e1 444 dhcp_discover(netif);
ICTFBI 0:4edb816d21e1 445 }
ICTFBI 0:4edb816d21e1 446 } else if (dhcp->state == DHCP_REBOOTING) {
ICTFBI 0:4edb816d21e1 447 if (dhcp->tries < REBOOT_TRIES) {
ICTFBI 0:4edb816d21e1 448 dhcp_reboot(netif);
ICTFBI 0:4edb816d21e1 449 } else {
ICTFBI 0:4edb816d21e1 450 dhcp_discover(netif);
ICTFBI 0:4edb816d21e1 451 }
ICTFBI 0:4edb816d21e1 452 }
ICTFBI 0:4edb816d21e1 453 }
ICTFBI 0:4edb816d21e1 454
ICTFBI 0:4edb816d21e1 455 /**
ICTFBI 0:4edb816d21e1 456 * The renewal period has timed out.
ICTFBI 0:4edb816d21e1 457 *
ICTFBI 0:4edb816d21e1 458 * @param netif the netif under DHCP control
ICTFBI 0:4edb816d21e1 459 */
ICTFBI 0:4edb816d21e1 460 static void
ICTFBI 0:4edb816d21e1 461 dhcp_t1_timeout(struct netif *netif)
ICTFBI 0:4edb816d21e1 462 {
ICTFBI 0:4edb816d21e1 463 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
ICTFBI 0:4edb816d21e1 465 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
ICTFBI 0:4edb816d21e1 466 (dhcp->state == DHCP_RENEWING)) {
ICTFBI 0:4edb816d21e1 467 /* just retry to renew - note that the rebind timer (t2) will
ICTFBI 0:4edb816d21e1 468 * eventually time-out if renew tries fail. */
ICTFBI 0:4edb816d21e1 469 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
ICTFBI 0:4edb816d21e1 470 ("dhcp_t1_timeout(): must renew\n"));
ICTFBI 0:4edb816d21e1 471 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
ICTFBI 0:4edb816d21e1 472 DHCP_RENEWING, not DHCP_BOUND */
ICTFBI 0:4edb816d21e1 473 dhcp_renew(netif);
ICTFBI 0:4edb816d21e1 474 }
ICTFBI 0:4edb816d21e1 475 }
ICTFBI 0:4edb816d21e1 476
ICTFBI 0:4edb816d21e1 477 /**
ICTFBI 0:4edb816d21e1 478 * The rebind period has timed out.
ICTFBI 0:4edb816d21e1 479 *
ICTFBI 0:4edb816d21e1 480 * @param netif the netif under DHCP control
ICTFBI 0:4edb816d21e1 481 */
ICTFBI 0:4edb816d21e1 482 static void
ICTFBI 0:4edb816d21e1 483 dhcp_t2_timeout(struct netif *netif)
ICTFBI 0:4edb816d21e1 484 {
ICTFBI 0:4edb816d21e1 485 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 486 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
ICTFBI 0:4edb816d21e1 487 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
ICTFBI 0:4edb816d21e1 488 (dhcp->state == DHCP_RENEWING)) {
ICTFBI 0:4edb816d21e1 489 /* just retry to rebind */
ICTFBI 0:4edb816d21e1 490 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
ICTFBI 0:4edb816d21e1 491 ("dhcp_t2_timeout(): must rebind\n"));
ICTFBI 0:4edb816d21e1 492 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
ICTFBI 0:4edb816d21e1 493 DHCP_REBINDING, not DHCP_BOUND */
ICTFBI 0:4edb816d21e1 494 dhcp_rebind(netif);
ICTFBI 0:4edb816d21e1 495 }
ICTFBI 0:4edb816d21e1 496 }
ICTFBI 0:4edb816d21e1 497
ICTFBI 0:4edb816d21e1 498 /**
ICTFBI 0:4edb816d21e1 499 * Handle a DHCP ACK packet
ICTFBI 0:4edb816d21e1 500 *
ICTFBI 0:4edb816d21e1 501 * @param netif the netif under DHCP control
ICTFBI 0:4edb816d21e1 502 */
ICTFBI 0:4edb816d21e1 503 static void
ICTFBI 0:4edb816d21e1 504 dhcp_handle_ack(struct netif *netif)
ICTFBI 0:4edb816d21e1 505 {
ICTFBI 0:4edb816d21e1 506 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 507 #if LWIP_DNS
ICTFBI 0:4edb816d21e1 508 u8_t n;
ICTFBI 0:4edb816d21e1 509 #endif /* LWIP_DNS */
ICTFBI 0:4edb816d21e1 510
ICTFBI 0:4edb816d21e1 511 /* clear options we might not get from the ACK */
ICTFBI 0:4edb816d21e1 512 ip_addr_set_zero(&dhcp->offered_sn_mask);
ICTFBI 0:4edb816d21e1 513 ip_addr_set_zero(&dhcp->offered_gw_addr);
ICTFBI 0:4edb816d21e1 514 #if LWIP_DHCP_BOOTP_FILE
ICTFBI 0:4edb816d21e1 515 ip_addr_set_zero(&dhcp->offered_si_addr);
ICTFBI 0:4edb816d21e1 516 #endif /* LWIP_DHCP_BOOTP_FILE */
ICTFBI 0:4edb816d21e1 517
ICTFBI 0:4edb816d21e1 518 /* lease time given? */
ICTFBI 0:4edb816d21e1 519 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
ICTFBI 0:4edb816d21e1 520 /* remember offered lease time */
ICTFBI 0:4edb816d21e1 521 dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
ICTFBI 0:4edb816d21e1 522 }
ICTFBI 0:4edb816d21e1 523 /* renewal period given? */
ICTFBI 0:4edb816d21e1 524 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
ICTFBI 0:4edb816d21e1 525 /* remember given renewal period */
ICTFBI 0:4edb816d21e1 526 dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
ICTFBI 0:4edb816d21e1 527 } else {
ICTFBI 0:4edb816d21e1 528 /* calculate safe periods for renewal */
ICTFBI 0:4edb816d21e1 529 dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
ICTFBI 0:4edb816d21e1 530 }
ICTFBI 0:4edb816d21e1 531
ICTFBI 0:4edb816d21e1 532 /* renewal period given? */
ICTFBI 0:4edb816d21e1 533 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
ICTFBI 0:4edb816d21e1 534 /* remember given rebind period */
ICTFBI 0:4edb816d21e1 535 dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
ICTFBI 0:4edb816d21e1 536 } else {
ICTFBI 0:4edb816d21e1 537 /* calculate safe periods for rebinding */
ICTFBI 0:4edb816d21e1 538 dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
ICTFBI 0:4edb816d21e1 539 }
ICTFBI 0:4edb816d21e1 540
ICTFBI 0:4edb816d21e1 541 /* (y)our internet address */
ICTFBI 0:4edb816d21e1 542 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
ICTFBI 0:4edb816d21e1 543
ICTFBI 0:4edb816d21e1 544 #if LWIP_DHCP_BOOTP_FILE
ICTFBI 0:4edb816d21e1 545 /* copy boot server address,
ICTFBI 0:4edb816d21e1 546 boot file name copied in dhcp_parse_reply if not overloaded */
ICTFBI 0:4edb816d21e1 547 ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
ICTFBI 0:4edb816d21e1 548 #endif /* LWIP_DHCP_BOOTP_FILE */
ICTFBI 0:4edb816d21e1 549
ICTFBI 0:4edb816d21e1 550 /* subnet mask given? */
ICTFBI 0:4edb816d21e1 551 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
ICTFBI 0:4edb816d21e1 552 /* remember given subnet mask */
ICTFBI 0:4edb816d21e1 553 ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
ICTFBI 0:4edb816d21e1 554 dhcp->subnet_mask_given = 1;
ICTFBI 0:4edb816d21e1 555 } else {
ICTFBI 0:4edb816d21e1 556 dhcp->subnet_mask_given = 0;
ICTFBI 0:4edb816d21e1 557 }
ICTFBI 0:4edb816d21e1 558
ICTFBI 0:4edb816d21e1 559 /* gateway router */
ICTFBI 0:4edb816d21e1 560 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
ICTFBI 0:4edb816d21e1 561 ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
ICTFBI 0:4edb816d21e1 562 }
ICTFBI 0:4edb816d21e1 563
ICTFBI 0:4edb816d21e1 564 #if LWIP_DNS
ICTFBI 0:4edb816d21e1 565 /* DNS servers */
ICTFBI 0:4edb816d21e1 566 n = 0;
ICTFBI 0:4edb816d21e1 567 while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
ICTFBI 0:4edb816d21e1 568 ip_addr_t dns_addr;
ICTFBI 0:4edb816d21e1 569 ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
ICTFBI 0:4edb816d21e1 570 dns_setserver(n, &dns_addr);
ICTFBI 0:4edb816d21e1 571 n++;
ICTFBI 0:4edb816d21e1 572 }
ICTFBI 0:4edb816d21e1 573 #endif /* LWIP_DNS */
ICTFBI 0:4edb816d21e1 574 }
ICTFBI 0:4edb816d21e1 575
ICTFBI 0:4edb816d21e1 576 /** Set a statically allocated struct dhcp to work with.
ICTFBI 0:4edb816d21e1 577 * Using this prevents dhcp_start to allocate it using mem_malloc.
ICTFBI 0:4edb816d21e1 578 *
ICTFBI 0:4edb816d21e1 579 * @param netif the netif for which to set the struct dhcp
ICTFBI 0:4edb816d21e1 580 * @param dhcp (uninitialised) dhcp struct allocated by the application
ICTFBI 0:4edb816d21e1 581 */
ICTFBI 0:4edb816d21e1 582 void
ICTFBI 0:4edb816d21e1 583 dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
ICTFBI 0:4edb816d21e1 584 {
ICTFBI 0:4edb816d21e1 585 LWIP_ASSERT("netif != NULL", netif != NULL);
ICTFBI 0:4edb816d21e1 586 LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
ICTFBI 0:4edb816d21e1 587 LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
ICTFBI 0:4edb816d21e1 588
ICTFBI 0:4edb816d21e1 589 /* clear data structure */
ICTFBI 0:4edb816d21e1 590 memset(dhcp, 0, sizeof(struct dhcp));
ICTFBI 0:4edb816d21e1 591 /* dhcp_set_state(&dhcp, DHCP_OFF); */
ICTFBI 0:4edb816d21e1 592 netif->dhcp = dhcp;
ICTFBI 0:4edb816d21e1 593 }
ICTFBI 0:4edb816d21e1 594
ICTFBI 0:4edb816d21e1 595 /**
ICTFBI 0:4edb816d21e1 596 * Start DHCP negotiation for a network interface.
ICTFBI 0:4edb816d21e1 597 *
ICTFBI 0:4edb816d21e1 598 * If no DHCP client instance was attached to this interface,
ICTFBI 0:4edb816d21e1 599 * a new client is created first. If a DHCP client instance
ICTFBI 0:4edb816d21e1 600 * was already present, it restarts negotiation.
ICTFBI 0:4edb816d21e1 601 *
ICTFBI 0:4edb816d21e1 602 * @param netif The lwIP network interface
ICTFBI 0:4edb816d21e1 603 * @return lwIP error code
ICTFBI 0:4edb816d21e1 604 * - ERR_OK - No error
ICTFBI 0:4edb816d21e1 605 * - ERR_MEM - Out of memory
ICTFBI 0:4edb816d21e1 606 */
ICTFBI 0:4edb816d21e1 607 err_t
ICTFBI 0:4edb816d21e1 608 dhcp_start(struct netif *netif)
ICTFBI 0:4edb816d21e1 609 {
ICTFBI 0:4edb816d21e1 610 struct dhcp *dhcp;
ICTFBI 0:4edb816d21e1 611 err_t result = ERR_OK;
ICTFBI 0:4edb816d21e1 612
ICTFBI 0:4edb816d21e1 613 LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
ICTFBI 0:4edb816d21e1 614 dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 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));
ICTFBI 0:4edb816d21e1 616 /* Remove the flag that says this netif is handled by DHCP,
ICTFBI 0:4edb816d21e1 617 it is set when we succeeded starting. */
ICTFBI 0:4edb816d21e1 618 netif->flags &= ~NETIF_FLAG_DHCP;
ICTFBI 0:4edb816d21e1 619
ICTFBI 0:4edb816d21e1 620 /* check hwtype of the netif */
ICTFBI 0:4edb816d21e1 621 if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
ICTFBI 0:4edb816d21e1 622 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
ICTFBI 0:4edb816d21e1 623 return ERR_ARG;
ICTFBI 0:4edb816d21e1 624 }
ICTFBI 0:4edb816d21e1 625
ICTFBI 0:4edb816d21e1 626 /* check MTU of the netif */
ICTFBI 0:4edb816d21e1 627 if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
ICTFBI 0:4edb816d21e1 628 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
ICTFBI 0:4edb816d21e1 629 return ERR_MEM;
ICTFBI 0:4edb816d21e1 630 }
ICTFBI 0:4edb816d21e1 631
ICTFBI 0:4edb816d21e1 632 /* no DHCP client attached yet? */
ICTFBI 0:4edb816d21e1 633 if (dhcp == NULL) {
ICTFBI 0:4edb816d21e1 634 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
ICTFBI 0:4edb816d21e1 635 dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
ICTFBI 0:4edb816d21e1 636 if (dhcp == NULL) {
ICTFBI 0:4edb816d21e1 637 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
ICTFBI 0:4edb816d21e1 638 return ERR_MEM;
ICTFBI 0:4edb816d21e1 639 }
ICTFBI 0:4edb816d21e1 640 /* store this dhcp client in the netif */
ICTFBI 0:4edb816d21e1 641 netif->dhcp = dhcp;
ICTFBI 0:4edb816d21e1 642 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
ICTFBI 0:4edb816d21e1 643 /* already has DHCP client attached */
ICTFBI 0:4edb816d21e1 644 } else {
ICTFBI 0:4edb816d21e1 645 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
ICTFBI 0:4edb816d21e1 646 if (dhcp->pcb != NULL) {
ICTFBI 0:4edb816d21e1 647 udp_remove(dhcp->pcb);
ICTFBI 0:4edb816d21e1 648 }
ICTFBI 0:4edb816d21e1 649 LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
ICTFBI 0:4edb816d21e1 650 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
ICTFBI 0:4edb816d21e1 651 }
ICTFBI 0:4edb816d21e1 652
ICTFBI 0:4edb816d21e1 653 /* clear data structure */
ICTFBI 0:4edb816d21e1 654 memset(dhcp, 0, sizeof(struct dhcp));
ICTFBI 0:4edb816d21e1 655 /* dhcp_set_state(&dhcp, DHCP_OFF); */
ICTFBI 0:4edb816d21e1 656 /* allocate UDP PCB */
ICTFBI 0:4edb816d21e1 657 dhcp->pcb = udp_new();
ICTFBI 0:4edb816d21e1 658 if (dhcp->pcb == NULL) {
ICTFBI 0:4edb816d21e1 659 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
ICTFBI 0:4edb816d21e1 660 return ERR_MEM;
ICTFBI 0:4edb816d21e1 661 }
ICTFBI 0:4edb816d21e1 662 dhcp->pcb->so_options |= SOF_BROADCAST;
ICTFBI 0:4edb816d21e1 663 /* set up local and remote port for the pcb */
ICTFBI 0:4edb816d21e1 664 udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
ICTFBI 0:4edb816d21e1 665 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
ICTFBI 0:4edb816d21e1 666 /* set up the recv callback and argument */
ICTFBI 0:4edb816d21e1 667 udp_recv(dhcp->pcb, dhcp_recv, netif);
ICTFBI 0:4edb816d21e1 668 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
ICTFBI 0:4edb816d21e1 669 /* (re)start the DHCP negotiation */
ICTFBI 0:4edb816d21e1 670 result = dhcp_discover(netif);
ICTFBI 0:4edb816d21e1 671 if (result != ERR_OK) {
ICTFBI 0:4edb816d21e1 672 /* free resources allocated above */
ICTFBI 0:4edb816d21e1 673 dhcp_stop(netif);
ICTFBI 0:4edb816d21e1 674 return ERR_MEM;
ICTFBI 0:4edb816d21e1 675 }
ICTFBI 0:4edb816d21e1 676 /* Set the flag that says this netif is handled by DHCP. */
ICTFBI 0:4edb816d21e1 677 netif->flags |= NETIF_FLAG_DHCP;
ICTFBI 0:4edb816d21e1 678 return result;
ICTFBI 0:4edb816d21e1 679 }
ICTFBI 0:4edb816d21e1 680
ICTFBI 0:4edb816d21e1 681 /**
ICTFBI 0:4edb816d21e1 682 * Inform a DHCP server of our manual configuration.
ICTFBI 0:4edb816d21e1 683 *
ICTFBI 0:4edb816d21e1 684 * This informs DHCP servers of our fixed IP address configuration
ICTFBI 0:4edb816d21e1 685 * by sending an INFORM message. It does not involve DHCP address
ICTFBI 0:4edb816d21e1 686 * configuration, it is just here to be nice to the network.
ICTFBI 0:4edb816d21e1 687 *
ICTFBI 0:4edb816d21e1 688 * @param netif The lwIP network interface
ICTFBI 0:4edb816d21e1 689 */
ICTFBI 0:4edb816d21e1 690 void
ICTFBI 0:4edb816d21e1 691 dhcp_inform(struct netif *netif)
ICTFBI 0:4edb816d21e1 692 {
ICTFBI 0:4edb816d21e1 693 struct dhcp dhcp;
ICTFBI 0:4edb816d21e1 694 err_t result = ERR_OK;
ICTFBI 0:4edb816d21e1 695 struct udp_pcb *pcb;
ICTFBI 0:4edb816d21e1 696
ICTFBI 0:4edb816d21e1 697 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
ICTFBI 0:4edb816d21e1 698
ICTFBI 0:4edb816d21e1 699 memset(&dhcp, 0, sizeof(struct dhcp));
ICTFBI 0:4edb816d21e1 700 dhcp_set_state(&dhcp, DHCP_INFORM);
ICTFBI 0:4edb816d21e1 701
ICTFBI 0:4edb816d21e1 702 if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
ICTFBI 0:4edb816d21e1 703 /* re-use existing pcb */
ICTFBI 0:4edb816d21e1 704 pcb = netif->dhcp->pcb;
ICTFBI 0:4edb816d21e1 705 } else {
ICTFBI 0:4edb816d21e1 706 pcb = udp_new();
ICTFBI 0:4edb816d21e1 707 if (pcb == NULL) {
ICTFBI 0:4edb816d21e1 708 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
ICTFBI 0:4edb816d21e1 709 return;
ICTFBI 0:4edb816d21e1 710 }
ICTFBI 0:4edb816d21e1 711 dhcp.pcb = pcb;
ICTFBI 0:4edb816d21e1 712 dhcp.pcb->so_options |= SOF_BROADCAST;
ICTFBI 0:4edb816d21e1 713 udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
ICTFBI 0:4edb816d21e1 714 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
ICTFBI 0:4edb816d21e1 715 }
ICTFBI 0:4edb816d21e1 716 /* create and initialize the DHCP message header */
ICTFBI 0:4edb816d21e1 717 result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
ICTFBI 0:4edb816d21e1 718 if (result == ERR_OK) {
ICTFBI 0:4edb816d21e1 719 dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
ICTFBI 0:4edb816d21e1 720 dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
ICTFBI 0:4edb816d21e1 721
ICTFBI 0:4edb816d21e1 722 dhcp_option_trailer(&dhcp);
ICTFBI 0:4edb816d21e1 723
ICTFBI 0:4edb816d21e1 724 pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
ICTFBI 0:4edb816d21e1 725
ICTFBI 0:4edb816d21e1 726 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
ICTFBI 0:4edb816d21e1 727 udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
ICTFBI 0:4edb816d21e1 728 dhcp_delete_msg(&dhcp);
ICTFBI 0:4edb816d21e1 729 } else {
ICTFBI 0:4edb816d21e1 730 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
ICTFBI 0:4edb816d21e1 731 }
ICTFBI 0:4edb816d21e1 732
ICTFBI 0:4edb816d21e1 733 if (dhcp.pcb != NULL) {
ICTFBI 0:4edb816d21e1 734 /* otherwise, the existing pcb was used */
ICTFBI 0:4edb816d21e1 735 udp_remove(dhcp.pcb);
ICTFBI 0:4edb816d21e1 736 }
ICTFBI 0:4edb816d21e1 737 }
ICTFBI 0:4edb816d21e1 738
ICTFBI 0:4edb816d21e1 739 /** Handle a possible change in the network configuration.
ICTFBI 0:4edb816d21e1 740 *
ICTFBI 0:4edb816d21e1 741 * This enters the REBOOTING state to verify that the currently bound
ICTFBI 0:4edb816d21e1 742 * address is still valid.
ICTFBI 0:4edb816d21e1 743 */
ICTFBI 0:4edb816d21e1 744 void
ICTFBI 0:4edb816d21e1 745 dhcp_network_changed(struct netif *netif)
ICTFBI 0:4edb816d21e1 746 {
ICTFBI 0:4edb816d21e1 747 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 748 if (!dhcp)
ICTFBI 0:4edb816d21e1 749 return;
ICTFBI 0:4edb816d21e1 750 switch (dhcp->state) {
ICTFBI 0:4edb816d21e1 751 case DHCP_REBINDING:
ICTFBI 0:4edb816d21e1 752 case DHCP_RENEWING:
ICTFBI 0:4edb816d21e1 753 case DHCP_BOUND:
ICTFBI 0:4edb816d21e1 754 case DHCP_REBOOTING:
ICTFBI 0:4edb816d21e1 755 netif_set_down(netif);
ICTFBI 0:4edb816d21e1 756 dhcp->tries = 0;
ICTFBI 0:4edb816d21e1 757 dhcp_reboot(netif);
ICTFBI 0:4edb816d21e1 758 break;
ICTFBI 0:4edb816d21e1 759 case DHCP_OFF:
ICTFBI 0:4edb816d21e1 760 /* stay off */
ICTFBI 0:4edb816d21e1 761 break;
ICTFBI 0:4edb816d21e1 762 default:
ICTFBI 0:4edb816d21e1 763 dhcp->tries = 0;
ICTFBI 0:4edb816d21e1 764 #if LWIP_DHCP_AUTOIP_COOP
ICTFBI 0:4edb816d21e1 765 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
ICTFBI 0:4edb816d21e1 766 #endif /* LWIP_DHCP_AUTOIP_COOP */
ICTFBI 0:4edb816d21e1 767 dhcp_discover(netif);
ICTFBI 0:4edb816d21e1 768 break;
ICTFBI 0:4edb816d21e1 769 }
ICTFBI 0:4edb816d21e1 770 }
ICTFBI 0:4edb816d21e1 771
ICTFBI 0:4edb816d21e1 772 #if DHCP_DOES_ARP_CHECK
ICTFBI 0:4edb816d21e1 773 /**
ICTFBI 0:4edb816d21e1 774 * Match an ARP reply with the offered IP address.
ICTFBI 0:4edb816d21e1 775 *
ICTFBI 0:4edb816d21e1 776 * @param netif the network interface on which the reply was received
ICTFBI 0:4edb816d21e1 777 * @param addr The IP address we received a reply from
ICTFBI 0:4edb816d21e1 778 */
ICTFBI 0:4edb816d21e1 779 void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
ICTFBI 0:4edb816d21e1 780 {
ICTFBI 0:4edb816d21e1 781 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
ICTFBI 0:4edb816d21e1 782 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
ICTFBI 0:4edb816d21e1 783 /* is a DHCP client doing an ARP check? */
ICTFBI 0:4edb816d21e1 784 if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
ICTFBI 0:4edb816d21e1 785 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
ICTFBI 0:4edb816d21e1 786 ip4_addr_get_u32(addr)));
ICTFBI 0:4edb816d21e1 787 /* did a host respond with the address we
ICTFBI 0:4edb816d21e1 788 were offered by the DHCP server? */
ICTFBI 0:4edb816d21e1 789 if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
ICTFBI 0:4edb816d21e1 790 /* we will not accept the offered address */
ICTFBI 0:4edb816d21e1 791 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
ICTFBI 0:4edb816d21e1 792 ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
ICTFBI 0:4edb816d21e1 793 dhcp_decline(netif);
ICTFBI 0:4edb816d21e1 794 }
ICTFBI 0:4edb816d21e1 795 }
ICTFBI 0:4edb816d21e1 796 }
ICTFBI 0:4edb816d21e1 797
ICTFBI 0:4edb816d21e1 798 /**
ICTFBI 0:4edb816d21e1 799 * Decline an offered lease.
ICTFBI 0:4edb816d21e1 800 *
ICTFBI 0:4edb816d21e1 801 * Tell the DHCP server we do not accept the offered address.
ICTFBI 0:4edb816d21e1 802 * One reason to decline the lease is when we find out the address
ICTFBI 0:4edb816d21e1 803 * is already in use by another host (through ARP).
ICTFBI 0:4edb816d21e1 804 *
ICTFBI 0:4edb816d21e1 805 * @param netif the netif under DHCP control
ICTFBI 0:4edb816d21e1 806 */
ICTFBI 0:4edb816d21e1 807 static err_t
ICTFBI 0:4edb816d21e1 808 dhcp_decline(struct netif *netif)
ICTFBI 0:4edb816d21e1 809 {
ICTFBI 0:4edb816d21e1 810 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 811 err_t result = ERR_OK;
ICTFBI 0:4edb816d21e1 812 u16_t msecs;
ICTFBI 0:4edb816d21e1 813 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
ICTFBI 0:4edb816d21e1 814 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
ICTFBI 0:4edb816d21e1 815 /* create and initialize the DHCP message header */
ICTFBI 0:4edb816d21e1 816 result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
ICTFBI 0:4edb816d21e1 817 if (result == ERR_OK) {
ICTFBI 0:4edb816d21e1 818 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
ICTFBI 0:4edb816d21e1 819 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
ICTFBI 0:4edb816d21e1 820
ICTFBI 0:4edb816d21e1 821 dhcp_option_trailer(dhcp);
ICTFBI 0:4edb816d21e1 822 /* resize pbuf to reflect true size of options */
ICTFBI 0:4edb816d21e1 823 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ICTFBI 0:4edb816d21e1 824
ICTFBI 0:4edb816d21e1 825 /* per section 4.4.4, broadcast DECLINE messages */
ICTFBI 0:4edb816d21e1 826 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
ICTFBI 0:4edb816d21e1 827 dhcp_delete_msg(dhcp);
ICTFBI 0:4edb816d21e1 828 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
ICTFBI 0:4edb816d21e1 829 } else {
ICTFBI 0:4edb816d21e1 830 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
ICTFBI 0:4edb816d21e1 831 ("dhcp_decline: could not allocate DHCP request\n"));
ICTFBI 0:4edb816d21e1 832 }
ICTFBI 0:4edb816d21e1 833 dhcp->tries++;
ICTFBI 0:4edb816d21e1 834 msecs = 10*1000;
ICTFBI 0:4edb816d21e1 835 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ICTFBI 0:4edb816d21e1 836 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
ICTFBI 0:4edb816d21e1 837 return result;
ICTFBI 0:4edb816d21e1 838 }
ICTFBI 0:4edb816d21e1 839 #endif /* DHCP_DOES_ARP_CHECK */
ICTFBI 0:4edb816d21e1 840
ICTFBI 0:4edb816d21e1 841
ICTFBI 0:4edb816d21e1 842 /**
ICTFBI 0:4edb816d21e1 843 * Start the DHCP process, discover a DHCP server.
ICTFBI 0:4edb816d21e1 844 *
ICTFBI 0:4edb816d21e1 845 * @param netif the netif under DHCP control
ICTFBI 0:4edb816d21e1 846 */
ICTFBI 0:4edb816d21e1 847 static err_t
ICTFBI 0:4edb816d21e1 848 dhcp_discover(struct netif *netif)
ICTFBI 0:4edb816d21e1 849 {
ICTFBI 0:4edb816d21e1 850 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 851 err_t result = ERR_OK;
ICTFBI 0:4edb816d21e1 852 u16_t msecs;
ICTFBI 0:4edb816d21e1 853 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
ICTFBI 0:4edb816d21e1 854 ip_addr_set_any(&dhcp->offered_ip_addr);
ICTFBI 0:4edb816d21e1 855 dhcp_set_state(dhcp, DHCP_SELECTING);
ICTFBI 0:4edb816d21e1 856 /* create and initialize the DHCP message header */
ICTFBI 0:4edb816d21e1 857 result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
ICTFBI 0:4edb816d21e1 858 if (result == ERR_OK) {
ICTFBI 0:4edb816d21e1 859 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
ICTFBI 0:4edb816d21e1 860
ICTFBI 0:4edb816d21e1 861 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
ICTFBI 0:4edb816d21e1 862 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
ICTFBI 0:4edb816d21e1 863
ICTFBI 0:4edb816d21e1 864 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
ICTFBI 0:4edb816d21e1 865 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
ICTFBI 0:4edb816d21e1 866 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
ICTFBI 0:4edb816d21e1 867 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
ICTFBI 0:4edb816d21e1 868 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
ICTFBI 0:4edb816d21e1 869
ICTFBI 0:4edb816d21e1 870 dhcp_option_trailer(dhcp);
ICTFBI 0:4edb816d21e1 871
ICTFBI 0:4edb816d21e1 872 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
ICTFBI 0:4edb816d21e1 873 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ICTFBI 0:4edb816d21e1 874
ICTFBI 0:4edb816d21e1 875 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
ICTFBI 0:4edb816d21e1 876 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
ICTFBI 0:4edb816d21e1 877 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
ICTFBI 0:4edb816d21e1 878 dhcp_delete_msg(dhcp);
ICTFBI 0:4edb816d21e1 879 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
ICTFBI 0:4edb816d21e1 880 } else {
ICTFBI 0:4edb816d21e1 881 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
ICTFBI 0:4edb816d21e1 882 }
ICTFBI 0:4edb816d21e1 883 dhcp->tries++;
ICTFBI 0:4edb816d21e1 884 #if LWIP_DHCP_AUTOIP_COOP
ICTFBI 0:4edb816d21e1 885 if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
ICTFBI 0:4edb816d21e1 886 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
ICTFBI 0:4edb816d21e1 887 autoip_start(netif);
ICTFBI 0:4edb816d21e1 888 }
ICTFBI 0:4edb816d21e1 889 #endif /* LWIP_DHCP_AUTOIP_COOP */
ICTFBI 0:4edb816d21e1 890 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
ICTFBI 0:4edb816d21e1 891 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ICTFBI 0:4edb816d21e1 892 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
ICTFBI 0:4edb816d21e1 893 return result;
ICTFBI 0:4edb816d21e1 894 }
ICTFBI 0:4edb816d21e1 895
ICTFBI 0:4edb816d21e1 896
ICTFBI 0:4edb816d21e1 897 /**
ICTFBI 0:4edb816d21e1 898 * Bind the interface to the offered IP address.
ICTFBI 0:4edb816d21e1 899 *
ICTFBI 0:4edb816d21e1 900 * @param netif network interface to bind to the offered address
ICTFBI 0:4edb816d21e1 901 */
ICTFBI 0:4edb816d21e1 902 static void
ICTFBI 0:4edb816d21e1 903 dhcp_bind(struct netif *netif)
ICTFBI 0:4edb816d21e1 904 {
ICTFBI 0:4edb816d21e1 905 u32_t timeout;
ICTFBI 0:4edb816d21e1 906 struct dhcp *dhcp;
ICTFBI 0:4edb816d21e1 907 ip_addr_t sn_mask, gw_addr;
ICTFBI 0:4edb816d21e1 908 LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
ICTFBI 0:4edb816d21e1 909 dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 910 LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
ICTFBI 0:4edb816d21e1 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));
ICTFBI 0:4edb816d21e1 912
ICTFBI 0:4edb816d21e1 913 /* temporary DHCP lease? */
ICTFBI 0:4edb816d21e1 914 if (dhcp->offered_t1_renew != 0xffffffffUL) {
ICTFBI 0:4edb816d21e1 915 /* set renewal period timer */
ICTFBI 0:4edb816d21e1 916 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
ICTFBI 0:4edb816d21e1 917 timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
ICTFBI 0:4edb816d21e1 918 if(timeout > 0xffff) {
ICTFBI 0:4edb816d21e1 919 timeout = 0xffff;
ICTFBI 0:4edb816d21e1 920 }
ICTFBI 0:4edb816d21e1 921 dhcp->t1_timeout = (u16_t)timeout;
ICTFBI 0:4edb816d21e1 922 if (dhcp->t1_timeout == 0) {
ICTFBI 0:4edb816d21e1 923 dhcp->t1_timeout = 1;
ICTFBI 0:4edb816d21e1 924 }
ICTFBI 0:4edb816d21e1 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));
ICTFBI 0:4edb816d21e1 926 }
ICTFBI 0:4edb816d21e1 927 /* set renewal period timer */
ICTFBI 0:4edb816d21e1 928 if (dhcp->offered_t2_rebind != 0xffffffffUL) {
ICTFBI 0:4edb816d21e1 929 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
ICTFBI 0:4edb816d21e1 930 timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
ICTFBI 0:4edb816d21e1 931 if(timeout > 0xffff) {
ICTFBI 0:4edb816d21e1 932 timeout = 0xffff;
ICTFBI 0:4edb816d21e1 933 }
ICTFBI 0:4edb816d21e1 934 dhcp->t2_timeout = (u16_t)timeout;
ICTFBI 0:4edb816d21e1 935 if (dhcp->t2_timeout == 0) {
ICTFBI 0:4edb816d21e1 936 dhcp->t2_timeout = 1;
ICTFBI 0:4edb816d21e1 937 }
ICTFBI 0:4edb816d21e1 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));
ICTFBI 0:4edb816d21e1 939 }
ICTFBI 0:4edb816d21e1 940
ICTFBI 0:4edb816d21e1 941 if (dhcp->subnet_mask_given) {
ICTFBI 0:4edb816d21e1 942 /* copy offered network mask */
ICTFBI 0:4edb816d21e1 943 ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
ICTFBI 0:4edb816d21e1 944 } else {
ICTFBI 0:4edb816d21e1 945 /* subnet mask not given, choose a safe subnet mask given the network class */
ICTFBI 0:4edb816d21e1 946 u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
ICTFBI 0:4edb816d21e1 947 if (first_octet <= 127) {
ICTFBI 0:4edb816d21e1 948 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
ICTFBI 0:4edb816d21e1 949 } else if (first_octet >= 192) {
ICTFBI 0:4edb816d21e1 950 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
ICTFBI 0:4edb816d21e1 951 } else {
ICTFBI 0:4edb816d21e1 952 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
ICTFBI 0:4edb816d21e1 953 }
ICTFBI 0:4edb816d21e1 954 }
ICTFBI 0:4edb816d21e1 955
ICTFBI 0:4edb816d21e1 956 ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
ICTFBI 0:4edb816d21e1 957 /* gateway address not given? */
ICTFBI 0:4edb816d21e1 958 if (ip_addr_isany(&gw_addr)) {
ICTFBI 0:4edb816d21e1 959 /* copy network address */
ICTFBI 0:4edb816d21e1 960 ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
ICTFBI 0:4edb816d21e1 961 /* use first host address on network as gateway */
ICTFBI 0:4edb816d21e1 962 ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001));
ICTFBI 0:4edb816d21e1 963 }
ICTFBI 0:4edb816d21e1 964
ICTFBI 0:4edb816d21e1 965 #if LWIP_DHCP_AUTOIP_COOP
ICTFBI 0:4edb816d21e1 966 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
ICTFBI 0:4edb816d21e1 967 autoip_stop(netif);
ICTFBI 0:4edb816d21e1 968 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
ICTFBI 0:4edb816d21e1 969 }
ICTFBI 0:4edb816d21e1 970 #endif /* LWIP_DHCP_AUTOIP_COOP */
ICTFBI 0:4edb816d21e1 971
ICTFBI 0:4edb816d21e1 972 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
ICTFBI 0:4edb816d21e1 973 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
ICTFBI 0:4edb816d21e1 974 netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
ICTFBI 0:4edb816d21e1 975 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
ICTFBI 0:4edb816d21e1 976 ip4_addr_get_u32(&sn_mask)));
ICTFBI 0:4edb816d21e1 977 netif_set_netmask(netif, &sn_mask);
ICTFBI 0:4edb816d21e1 978 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
ICTFBI 0:4edb816d21e1 979 ip4_addr_get_u32(&gw_addr)));
ICTFBI 0:4edb816d21e1 980 netif_set_gw(netif, &gw_addr);
ICTFBI 0:4edb816d21e1 981 /* bring the interface up */
ICTFBI 0:4edb816d21e1 982 netif_set_up(netif);
ICTFBI 0:4edb816d21e1 983 /* netif is now bound to DHCP leased address */
ICTFBI 0:4edb816d21e1 984 dhcp_set_state(dhcp, DHCP_BOUND);
ICTFBI 0:4edb816d21e1 985 }
ICTFBI 0:4edb816d21e1 986
ICTFBI 0:4edb816d21e1 987 /**
ICTFBI 0:4edb816d21e1 988 * Renew an existing DHCP lease at the involved DHCP server.
ICTFBI 0:4edb816d21e1 989 *
ICTFBI 0:4edb816d21e1 990 * @param netif network interface which must renew its lease
ICTFBI 0:4edb816d21e1 991 */
ICTFBI 0:4edb816d21e1 992 err_t
ICTFBI 0:4edb816d21e1 993 dhcp_renew(struct netif *netif)
ICTFBI 0:4edb816d21e1 994 {
ICTFBI 0:4edb816d21e1 995 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 996 err_t result;
ICTFBI 0:4edb816d21e1 997 u16_t msecs;
ICTFBI 0:4edb816d21e1 998 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
ICTFBI 0:4edb816d21e1 999 dhcp_set_state(dhcp, DHCP_RENEWING);
ICTFBI 0:4edb816d21e1 1000
ICTFBI 0:4edb816d21e1 1001 /* create and initialize the DHCP message header */
ICTFBI 0:4edb816d21e1 1002 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
ICTFBI 0:4edb816d21e1 1003 if (result == ERR_OK) {
ICTFBI 0:4edb816d21e1 1004 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
ICTFBI 0:4edb816d21e1 1005 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
ICTFBI 0:4edb816d21e1 1006
ICTFBI 0:4edb816d21e1 1007 #if LWIP_NETIF_HOSTNAME
ICTFBI 0:4edb816d21e1 1008 if (netif->hostname != NULL) {
ICTFBI 0:4edb816d21e1 1009 const char *p = (const char*)netif->hostname;
ICTFBI 0:4edb816d21e1 1010 u8_t namelen = (u8_t)strlen(p);
ICTFBI 0:4edb816d21e1 1011 if (namelen > 0) {
ICTFBI 0:4edb816d21e1 1012 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
ICTFBI 0:4edb816d21e1 1013 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
ICTFBI 0:4edb816d21e1 1014 while (*p) {
ICTFBI 0:4edb816d21e1 1015 dhcp_option_byte(dhcp, *p++);
ICTFBI 0:4edb816d21e1 1016 }
ICTFBI 0:4edb816d21e1 1017 }
ICTFBI 0:4edb816d21e1 1018 }
ICTFBI 0:4edb816d21e1 1019 #endif /* LWIP_NETIF_HOSTNAME */
ICTFBI 0:4edb816d21e1 1020
ICTFBI 0:4edb816d21e1 1021 #if 0
ICTFBI 0:4edb816d21e1 1022 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
ICTFBI 0:4edb816d21e1 1023 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
ICTFBI 0:4edb816d21e1 1024 #endif
ICTFBI 0:4edb816d21e1 1025
ICTFBI 0:4edb816d21e1 1026 #if 0
ICTFBI 0:4edb816d21e1 1027 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
ICTFBI 0:4edb816d21e1 1028 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
ICTFBI 0:4edb816d21e1 1029 #endif
ICTFBI 0:4edb816d21e1 1030 /* append DHCP message trailer */
ICTFBI 0:4edb816d21e1 1031 dhcp_option_trailer(dhcp);
ICTFBI 0:4edb816d21e1 1032
ICTFBI 0:4edb816d21e1 1033 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ICTFBI 0:4edb816d21e1 1034
ICTFBI 0:4edb816d21e1 1035 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
ICTFBI 0:4edb816d21e1 1036 dhcp_delete_msg(dhcp);
ICTFBI 0:4edb816d21e1 1037
ICTFBI 0:4edb816d21e1 1038 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
ICTFBI 0:4edb816d21e1 1039 } else {
ICTFBI 0:4edb816d21e1 1040 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
ICTFBI 0:4edb816d21e1 1041 }
ICTFBI 0:4edb816d21e1 1042 dhcp->tries++;
ICTFBI 0:4edb816d21e1 1043 /* back-off on retries, but to a maximum of 20 seconds */
ICTFBI 0:4edb816d21e1 1044 msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
ICTFBI 0:4edb816d21e1 1045 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ICTFBI 0:4edb816d21e1 1046 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
ICTFBI 0:4edb816d21e1 1047 return result;
ICTFBI 0:4edb816d21e1 1048 }
ICTFBI 0:4edb816d21e1 1049
ICTFBI 0:4edb816d21e1 1050 /**
ICTFBI 0:4edb816d21e1 1051 * Rebind with a DHCP server for an existing DHCP lease.
ICTFBI 0:4edb816d21e1 1052 *
ICTFBI 0:4edb816d21e1 1053 * @param netif network interface which must rebind with a DHCP server
ICTFBI 0:4edb816d21e1 1054 */
ICTFBI 0:4edb816d21e1 1055 static err_t
ICTFBI 0:4edb816d21e1 1056 dhcp_rebind(struct netif *netif)
ICTFBI 0:4edb816d21e1 1057 {
ICTFBI 0:4edb816d21e1 1058 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 1059 err_t result;
ICTFBI 0:4edb816d21e1 1060 u16_t msecs;
ICTFBI 0:4edb816d21e1 1061 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
ICTFBI 0:4edb816d21e1 1062 dhcp_set_state(dhcp, DHCP_REBINDING);
ICTFBI 0:4edb816d21e1 1063
ICTFBI 0:4edb816d21e1 1064 /* create and initialize the DHCP message header */
ICTFBI 0:4edb816d21e1 1065 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
ICTFBI 0:4edb816d21e1 1066 if (result == ERR_OK) {
ICTFBI 0:4edb816d21e1 1067 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
ICTFBI 0:4edb816d21e1 1068 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
ICTFBI 0:4edb816d21e1 1069
ICTFBI 0:4edb816d21e1 1070 #if LWIP_NETIF_HOSTNAME
ICTFBI 0:4edb816d21e1 1071 if (netif->hostname != NULL) {
ICTFBI 0:4edb816d21e1 1072 const char *p = (const char*)netif->hostname;
ICTFBI 0:4edb816d21e1 1073 u8_t namelen = (u8_t)strlen(p);
ICTFBI 0:4edb816d21e1 1074 if (namelen > 0) {
ICTFBI 0:4edb816d21e1 1075 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
ICTFBI 0:4edb816d21e1 1076 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
ICTFBI 0:4edb816d21e1 1077 while (*p) {
ICTFBI 0:4edb816d21e1 1078 dhcp_option_byte(dhcp, *p++);
ICTFBI 0:4edb816d21e1 1079 }
ICTFBI 0:4edb816d21e1 1080 }
ICTFBI 0:4edb816d21e1 1081 }
ICTFBI 0:4edb816d21e1 1082 #endif /* LWIP_NETIF_HOSTNAME */
ICTFBI 0:4edb816d21e1 1083
ICTFBI 0:4edb816d21e1 1084 #if 0
ICTFBI 0:4edb816d21e1 1085 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
ICTFBI 0:4edb816d21e1 1086 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
ICTFBI 0:4edb816d21e1 1087
ICTFBI 0:4edb816d21e1 1088 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
ICTFBI 0:4edb816d21e1 1089 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
ICTFBI 0:4edb816d21e1 1090 #endif
ICTFBI 0:4edb816d21e1 1091
ICTFBI 0:4edb816d21e1 1092 dhcp_option_trailer(dhcp);
ICTFBI 0:4edb816d21e1 1093
ICTFBI 0:4edb816d21e1 1094 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ICTFBI 0:4edb816d21e1 1095
ICTFBI 0:4edb816d21e1 1096 /* broadcast to server */
ICTFBI 0:4edb816d21e1 1097 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
ICTFBI 0:4edb816d21e1 1098 dhcp_delete_msg(dhcp);
ICTFBI 0:4edb816d21e1 1099 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
ICTFBI 0:4edb816d21e1 1100 } else {
ICTFBI 0:4edb816d21e1 1101 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
ICTFBI 0:4edb816d21e1 1102 }
ICTFBI 0:4edb816d21e1 1103 dhcp->tries++;
ICTFBI 0:4edb816d21e1 1104 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
ICTFBI 0:4edb816d21e1 1105 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ICTFBI 0:4edb816d21e1 1106 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
ICTFBI 0:4edb816d21e1 1107 return result;
ICTFBI 0:4edb816d21e1 1108 }
ICTFBI 0:4edb816d21e1 1109
ICTFBI 0:4edb816d21e1 1110 /**
ICTFBI 0:4edb816d21e1 1111 * Enter REBOOTING state to verify an existing lease
ICTFBI 0:4edb816d21e1 1112 *
ICTFBI 0:4edb816d21e1 1113 * @param netif network interface which must reboot
ICTFBI 0:4edb816d21e1 1114 */
ICTFBI 0:4edb816d21e1 1115 static err_t
ICTFBI 0:4edb816d21e1 1116 dhcp_reboot(struct netif *netif)
ICTFBI 0:4edb816d21e1 1117 {
ICTFBI 0:4edb816d21e1 1118 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 1119 err_t result;
ICTFBI 0:4edb816d21e1 1120 u16_t msecs;
ICTFBI 0:4edb816d21e1 1121 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
ICTFBI 0:4edb816d21e1 1122 dhcp_set_state(dhcp, DHCP_REBOOTING);
ICTFBI 0:4edb816d21e1 1123
ICTFBI 0:4edb816d21e1 1124 /* create and initialize the DHCP message header */
ICTFBI 0:4edb816d21e1 1125 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
ICTFBI 0:4edb816d21e1 1126 if (result == ERR_OK) {
ICTFBI 0:4edb816d21e1 1127 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
ICTFBI 0:4edb816d21e1 1128 dhcp_option_short(dhcp, 576);
ICTFBI 0:4edb816d21e1 1129
ICTFBI 0:4edb816d21e1 1130 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
ICTFBI 0:4edb816d21e1 1131 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
ICTFBI 0:4edb816d21e1 1132
ICTFBI 0:4edb816d21e1 1133 dhcp_option_trailer(dhcp);
ICTFBI 0:4edb816d21e1 1134
ICTFBI 0:4edb816d21e1 1135 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ICTFBI 0:4edb816d21e1 1136
ICTFBI 0:4edb816d21e1 1137 /* broadcast to server */
ICTFBI 0:4edb816d21e1 1138 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
ICTFBI 0:4edb816d21e1 1139 dhcp_delete_msg(dhcp);
ICTFBI 0:4edb816d21e1 1140 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
ICTFBI 0:4edb816d21e1 1141 } else {
ICTFBI 0:4edb816d21e1 1142 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
ICTFBI 0:4edb816d21e1 1143 }
ICTFBI 0:4edb816d21e1 1144 dhcp->tries++;
ICTFBI 0:4edb816d21e1 1145 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
ICTFBI 0:4edb816d21e1 1146 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ICTFBI 0:4edb816d21e1 1147 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
ICTFBI 0:4edb816d21e1 1148 return result;
ICTFBI 0:4edb816d21e1 1149 }
ICTFBI 0:4edb816d21e1 1150
ICTFBI 0:4edb816d21e1 1151
ICTFBI 0:4edb816d21e1 1152 /**
ICTFBI 0:4edb816d21e1 1153 * Release a DHCP lease.
ICTFBI 0:4edb816d21e1 1154 *
ICTFBI 0:4edb816d21e1 1155 * @param netif network interface which must release its lease
ICTFBI 0:4edb816d21e1 1156 */
ICTFBI 0:4edb816d21e1 1157 err_t
ICTFBI 0:4edb816d21e1 1158 dhcp_release(struct netif *netif)
ICTFBI 0:4edb816d21e1 1159 {
ICTFBI 0:4edb816d21e1 1160 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 1161 err_t result;
ICTFBI 0:4edb816d21e1 1162 u16_t msecs;
ICTFBI 0:4edb816d21e1 1163 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
ICTFBI 0:4edb816d21e1 1164
ICTFBI 0:4edb816d21e1 1165 /* idle DHCP client */
ICTFBI 0:4edb816d21e1 1166 dhcp_set_state(dhcp, DHCP_OFF);
ICTFBI 0:4edb816d21e1 1167 /* clean old DHCP offer */
ICTFBI 0:4edb816d21e1 1168 ip_addr_set_zero(&dhcp->server_ip_addr);
ICTFBI 0:4edb816d21e1 1169 ip_addr_set_zero(&dhcp->offered_ip_addr);
ICTFBI 0:4edb816d21e1 1170 ip_addr_set_zero(&dhcp->offered_sn_mask);
ICTFBI 0:4edb816d21e1 1171 ip_addr_set_zero(&dhcp->offered_gw_addr);
ICTFBI 0:4edb816d21e1 1172 #if LWIP_DHCP_BOOTP_FILE
ICTFBI 0:4edb816d21e1 1173 ip_addr_set_zero(&dhcp->offered_si_addr);
ICTFBI 0:4edb816d21e1 1174 #endif /* LWIP_DHCP_BOOTP_FILE */
ICTFBI 0:4edb816d21e1 1175 dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
ICTFBI 0:4edb816d21e1 1176
ICTFBI 0:4edb816d21e1 1177 /* create and initialize the DHCP message header */
ICTFBI 0:4edb816d21e1 1178 result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
ICTFBI 0:4edb816d21e1 1179 if (result == ERR_OK) {
ICTFBI 0:4edb816d21e1 1180 dhcp_option_trailer(dhcp);
ICTFBI 0:4edb816d21e1 1181
ICTFBI 0:4edb816d21e1 1182 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
ICTFBI 0:4edb816d21e1 1183
ICTFBI 0:4edb816d21e1 1184 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
ICTFBI 0:4edb816d21e1 1185 dhcp_delete_msg(dhcp);
ICTFBI 0:4edb816d21e1 1186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
ICTFBI 0:4edb816d21e1 1187 } else {
ICTFBI 0:4edb816d21e1 1188 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
ICTFBI 0:4edb816d21e1 1189 }
ICTFBI 0:4edb816d21e1 1190 dhcp->tries++;
ICTFBI 0:4edb816d21e1 1191 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
ICTFBI 0:4edb816d21e1 1192 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
ICTFBI 0:4edb816d21e1 1193 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
ICTFBI 0:4edb816d21e1 1194 /* bring the interface down */
ICTFBI 0:4edb816d21e1 1195 netif_set_down(netif);
ICTFBI 0:4edb816d21e1 1196 /* remove IP address from interface */
ICTFBI 0:4edb816d21e1 1197 netif_set_ipaddr(netif, IP_ADDR_ANY);
ICTFBI 0:4edb816d21e1 1198 netif_set_gw(netif, IP_ADDR_ANY);
ICTFBI 0:4edb816d21e1 1199 netif_set_netmask(netif, IP_ADDR_ANY);
ICTFBI 0:4edb816d21e1 1200
ICTFBI 0:4edb816d21e1 1201 return result;
ICTFBI 0:4edb816d21e1 1202 }
ICTFBI 0:4edb816d21e1 1203
ICTFBI 0:4edb816d21e1 1204 /**
ICTFBI 0:4edb816d21e1 1205 * Remove the DHCP client from the interface.
ICTFBI 0:4edb816d21e1 1206 *
ICTFBI 0:4edb816d21e1 1207 * @param netif The network interface to stop DHCP on
ICTFBI 0:4edb816d21e1 1208 */
ICTFBI 0:4edb816d21e1 1209 void
ICTFBI 0:4edb816d21e1 1210 dhcp_stop(struct netif *netif)
ICTFBI 0:4edb816d21e1 1211 {
ICTFBI 0:4edb816d21e1 1212 struct dhcp *dhcp;
ICTFBI 0:4edb816d21e1 1213 LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
ICTFBI 0:4edb816d21e1 1214 dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 1215 /* Remove the flag that says this netif is handled by DHCP. */
ICTFBI 0:4edb816d21e1 1216 netif->flags &= ~NETIF_FLAG_DHCP;
ICTFBI 0:4edb816d21e1 1217
ICTFBI 0:4edb816d21e1 1218 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
ICTFBI 0:4edb816d21e1 1219 /* netif is DHCP configured? */
ICTFBI 0:4edb816d21e1 1220 if (dhcp != NULL) {
ICTFBI 0:4edb816d21e1 1221 #if LWIP_DHCP_AUTOIP_COOP
ICTFBI 0:4edb816d21e1 1222 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
ICTFBI 0:4edb816d21e1 1223 autoip_stop(netif);
ICTFBI 0:4edb816d21e1 1224 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
ICTFBI 0:4edb816d21e1 1225 }
ICTFBI 0:4edb816d21e1 1226 #endif /* LWIP_DHCP_AUTOIP_COOP */
ICTFBI 0:4edb816d21e1 1227
ICTFBI 0:4edb816d21e1 1228 if (dhcp->pcb != NULL) {
ICTFBI 0:4edb816d21e1 1229 udp_remove(dhcp->pcb);
ICTFBI 0:4edb816d21e1 1230 dhcp->pcb = NULL;
ICTFBI 0:4edb816d21e1 1231 }
ICTFBI 0:4edb816d21e1 1232 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
ICTFBI 0:4edb816d21e1 1233 dhcp_set_state(dhcp, DHCP_OFF);
ICTFBI 0:4edb816d21e1 1234 }
ICTFBI 0:4edb816d21e1 1235 }
ICTFBI 0:4edb816d21e1 1236
ICTFBI 0:4edb816d21e1 1237 /*
ICTFBI 0:4edb816d21e1 1238 * Set the DHCP state of a DHCP client.
ICTFBI 0:4edb816d21e1 1239 *
ICTFBI 0:4edb816d21e1 1240 * If the state changed, reset the number of tries.
ICTFBI 0:4edb816d21e1 1241 */
ICTFBI 0:4edb816d21e1 1242 static void
ICTFBI 0:4edb816d21e1 1243 dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
ICTFBI 0:4edb816d21e1 1244 {
ICTFBI 0:4edb816d21e1 1245 if (new_state != dhcp->state) {
ICTFBI 0:4edb816d21e1 1246 dhcp->state = new_state;
ICTFBI 0:4edb816d21e1 1247 dhcp->tries = 0;
ICTFBI 0:4edb816d21e1 1248 dhcp->request_timeout = 0;
ICTFBI 0:4edb816d21e1 1249 }
ICTFBI 0:4edb816d21e1 1250 }
ICTFBI 0:4edb816d21e1 1251
ICTFBI 0:4edb816d21e1 1252 /*
ICTFBI 0:4edb816d21e1 1253 * Concatenate an option type and length field to the outgoing
ICTFBI 0:4edb816d21e1 1254 * DHCP message.
ICTFBI 0:4edb816d21e1 1255 *
ICTFBI 0:4edb816d21e1 1256 */
ICTFBI 0:4edb816d21e1 1257 static void
ICTFBI 0:4edb816d21e1 1258 dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
ICTFBI 0:4edb816d21e1 1259 {
ICTFBI 0:4edb816d21e1 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);
ICTFBI 0:4edb816d21e1 1261 dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
ICTFBI 0:4edb816d21e1 1262 dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
ICTFBI 0:4edb816d21e1 1263 }
ICTFBI 0:4edb816d21e1 1264 /*
ICTFBI 0:4edb816d21e1 1265 * Concatenate a single byte to the outgoing DHCP message.
ICTFBI 0:4edb816d21e1 1266 *
ICTFBI 0:4edb816d21e1 1267 */
ICTFBI 0:4edb816d21e1 1268 static void
ICTFBI 0:4edb816d21e1 1269 dhcp_option_byte(struct dhcp *dhcp, u8_t value)
ICTFBI 0:4edb816d21e1 1270 {
ICTFBI 0:4edb816d21e1 1271 LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
ICTFBI 0:4edb816d21e1 1272 dhcp->msg_out->options[dhcp->options_out_len++] = value;
ICTFBI 0:4edb816d21e1 1273 }
ICTFBI 0:4edb816d21e1 1274
ICTFBI 0:4edb816d21e1 1275 static void
ICTFBI 0:4edb816d21e1 1276 dhcp_option_short(struct dhcp *dhcp, u16_t value)
ICTFBI 0:4edb816d21e1 1277 {
ICTFBI 0:4edb816d21e1 1278 LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
ICTFBI 0:4edb816d21e1 1279 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
ICTFBI 0:4edb816d21e1 1280 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
ICTFBI 0:4edb816d21e1 1281 }
ICTFBI 0:4edb816d21e1 1282
ICTFBI 0:4edb816d21e1 1283 static void
ICTFBI 0:4edb816d21e1 1284 dhcp_option_long(struct dhcp *dhcp, u32_t value)
ICTFBI 0:4edb816d21e1 1285 {
ICTFBI 0:4edb816d21e1 1286 LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
ICTFBI 0:4edb816d21e1 1287 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
ICTFBI 0:4edb816d21e1 1288 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
ICTFBI 0:4edb816d21e1 1289 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
ICTFBI 0:4edb816d21e1 1290 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
ICTFBI 0:4edb816d21e1 1291 }
ICTFBI 0:4edb816d21e1 1292
ICTFBI 0:4edb816d21e1 1293 /**
ICTFBI 0:4edb816d21e1 1294 * Extract the DHCP message and the DHCP options.
ICTFBI 0:4edb816d21e1 1295 *
ICTFBI 0:4edb816d21e1 1296 * Extract the DHCP message and the DHCP options, each into a contiguous
ICTFBI 0:4edb816d21e1 1297 * piece of memory. As a DHCP message is variable sized by its options,
ICTFBI 0:4edb816d21e1 1298 * and also allows overriding some fields for options, the easy approach
ICTFBI 0:4edb816d21e1 1299 * is to first unfold the options into a conitguous piece of memory, and
ICTFBI 0:4edb816d21e1 1300 * use that further on.
ICTFBI 0:4edb816d21e1 1301 *
ICTFBI 0:4edb816d21e1 1302 */
ICTFBI 0:4edb816d21e1 1303 static err_t
ICTFBI 0:4edb816d21e1 1304 dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
ICTFBI 0:4edb816d21e1 1305 {
ICTFBI 0:4edb816d21e1 1306 u8_t *options;
ICTFBI 0:4edb816d21e1 1307 u16_t offset;
ICTFBI 0:4edb816d21e1 1308 u16_t offset_max;
ICTFBI 0:4edb816d21e1 1309 u16_t options_idx;
ICTFBI 0:4edb816d21e1 1310 u16_t options_idx_max;
ICTFBI 0:4edb816d21e1 1311 struct pbuf *q;
ICTFBI 0:4edb816d21e1 1312 int parse_file_as_options = 0;
ICTFBI 0:4edb816d21e1 1313 int parse_sname_as_options = 0;
ICTFBI 0:4edb816d21e1 1314
ICTFBI 0:4edb816d21e1 1315 /* clear received options */
ICTFBI 0:4edb816d21e1 1316 dhcp_clear_all_options(dhcp);
ICTFBI 0:4edb816d21e1 1317 /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
ICTFBI 0:4edb816d21e1 1318 if (p->len < DHCP_SNAME_OFS) {
ICTFBI 0:4edb816d21e1 1319 return ERR_BUF;
ICTFBI 0:4edb816d21e1 1320 }
ICTFBI 0:4edb816d21e1 1321 dhcp->msg_in = (struct dhcp_msg *)p->payload;
ICTFBI 0:4edb816d21e1 1322 #if LWIP_DHCP_BOOTP_FILE
ICTFBI 0:4edb816d21e1 1323 /* clear boot file name */
ICTFBI 0:4edb816d21e1 1324 dhcp->boot_file_name[0] = 0;
ICTFBI 0:4edb816d21e1 1325 #endif /* LWIP_DHCP_BOOTP_FILE */
ICTFBI 0:4edb816d21e1 1326
ICTFBI 0:4edb816d21e1 1327 /* parse options */
ICTFBI 0:4edb816d21e1 1328
ICTFBI 0:4edb816d21e1 1329 /* start with options field */
ICTFBI 0:4edb816d21e1 1330 options_idx = DHCP_OPTIONS_OFS;
ICTFBI 0:4edb816d21e1 1331 /* parse options to the end of the received packet */
ICTFBI 0:4edb816d21e1 1332 options_idx_max = p->tot_len;
ICTFBI 0:4edb816d21e1 1333 again:
ICTFBI 0:4edb816d21e1 1334 q = p;
ICTFBI 0:4edb816d21e1 1335 while((q != NULL) && (options_idx >= q->len)) {
ICTFBI 0:4edb816d21e1 1336 options_idx -= q->len;
ICTFBI 0:4edb816d21e1 1337 options_idx_max -= q->len;
ICTFBI 0:4edb816d21e1 1338 q = q->next;
ICTFBI 0:4edb816d21e1 1339 }
ICTFBI 0:4edb816d21e1 1340 if (q == NULL) {
ICTFBI 0:4edb816d21e1 1341 return ERR_BUF;
ICTFBI 0:4edb816d21e1 1342 }
ICTFBI 0:4edb816d21e1 1343 offset = options_idx;
ICTFBI 0:4edb816d21e1 1344 offset_max = options_idx_max;
ICTFBI 0:4edb816d21e1 1345 options = (u8_t*)q->payload;
ICTFBI 0:4edb816d21e1 1346 /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
ICTFBI 0:4edb816d21e1 1347 while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
ICTFBI 0:4edb816d21e1 1348 u8_t op = options[offset];
ICTFBI 0:4edb816d21e1 1349 u8_t len;
ICTFBI 0:4edb816d21e1 1350 u8_t decode_len = 0;
ICTFBI 0:4edb816d21e1 1351 int decode_idx = -1;
ICTFBI 0:4edb816d21e1 1352 u16_t val_offset = offset + 2;
ICTFBI 0:4edb816d21e1 1353 /* len byte might be in the next pbuf */
ICTFBI 0:4edb816d21e1 1354 if (offset + 1 < q->len) {
ICTFBI 0:4edb816d21e1 1355 len = options[offset + 1];
ICTFBI 0:4edb816d21e1 1356 } else {
ICTFBI 0:4edb816d21e1 1357 len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
ICTFBI 0:4edb816d21e1 1358 }
ICTFBI 0:4edb816d21e1 1359 /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
ICTFBI 0:4edb816d21e1 1360 decode_len = len;
ICTFBI 0:4edb816d21e1 1361 switch(op) {
ICTFBI 0:4edb816d21e1 1362 /* case(DHCP_OPTION_END): handled above */
ICTFBI 0:4edb816d21e1 1363 case(DHCP_OPTION_PAD):
ICTFBI 0:4edb816d21e1 1364 /* special option: no len encoded */
ICTFBI 0:4edb816d21e1 1365 decode_len = len = 0;
ICTFBI 0:4edb816d21e1 1366 /* will be increased below */
ICTFBI 0:4edb816d21e1 1367 offset--;
ICTFBI 0:4edb816d21e1 1368 break;
ICTFBI 0:4edb816d21e1 1369 case(DHCP_OPTION_SUBNET_MASK):
ICTFBI 0:4edb816d21e1 1370 LWIP_ASSERT("len == 4", len == 4);
ICTFBI 0:4edb816d21e1 1371 decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
ICTFBI 0:4edb816d21e1 1372 break;
ICTFBI 0:4edb816d21e1 1373 case(DHCP_OPTION_ROUTER):
ICTFBI 0:4edb816d21e1 1374 decode_len = 4; /* only copy the first given router */
ICTFBI 0:4edb816d21e1 1375 LWIP_ASSERT("len >= decode_len", len >= decode_len);
ICTFBI 0:4edb816d21e1 1376 decode_idx = DHCP_OPTION_IDX_ROUTER;
ICTFBI 0:4edb816d21e1 1377 break;
ICTFBI 0:4edb816d21e1 1378 case(DHCP_OPTION_DNS_SERVER):
ICTFBI 0:4edb816d21e1 1379 /* special case: there might be more than one server */
ICTFBI 0:4edb816d21e1 1380 LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
ICTFBI 0:4edb816d21e1 1381 /* limit number of DNS servers */
ICTFBI 0:4edb816d21e1 1382 decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
ICTFBI 0:4edb816d21e1 1383 LWIP_ASSERT("len >= decode_len", len >= decode_len);
ICTFBI 0:4edb816d21e1 1384 decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
ICTFBI 0:4edb816d21e1 1385 break;
ICTFBI 0:4edb816d21e1 1386 case(DHCP_OPTION_LEASE_TIME):
ICTFBI 0:4edb816d21e1 1387 LWIP_ASSERT("len == 4", len == 4);
ICTFBI 0:4edb816d21e1 1388 decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
ICTFBI 0:4edb816d21e1 1389 break;
ICTFBI 0:4edb816d21e1 1390 case(DHCP_OPTION_OVERLOAD):
ICTFBI 0:4edb816d21e1 1391 LWIP_ASSERT("len == 1", len == 1);
ICTFBI 0:4edb816d21e1 1392 decode_idx = DHCP_OPTION_IDX_OVERLOAD;
ICTFBI 0:4edb816d21e1 1393 break;
ICTFBI 0:4edb816d21e1 1394 case(DHCP_OPTION_MESSAGE_TYPE):
ICTFBI 0:4edb816d21e1 1395 LWIP_ASSERT("len == 1", len == 1);
ICTFBI 0:4edb816d21e1 1396 decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
ICTFBI 0:4edb816d21e1 1397 break;
ICTFBI 0:4edb816d21e1 1398 case(DHCP_OPTION_SERVER_ID):
ICTFBI 0:4edb816d21e1 1399 LWIP_ASSERT("len == 4", len == 4);
ICTFBI 0:4edb816d21e1 1400 decode_idx = DHCP_OPTION_IDX_SERVER_ID;
ICTFBI 0:4edb816d21e1 1401 break;
ICTFBI 0:4edb816d21e1 1402 case(DHCP_OPTION_T1):
ICTFBI 0:4edb816d21e1 1403 LWIP_ASSERT("len == 4", len == 4);
ICTFBI 0:4edb816d21e1 1404 decode_idx = DHCP_OPTION_IDX_T1;
ICTFBI 0:4edb816d21e1 1405 break;
ICTFBI 0:4edb816d21e1 1406 case(DHCP_OPTION_T2):
ICTFBI 0:4edb816d21e1 1407 LWIP_ASSERT("len == 4", len == 4);
ICTFBI 0:4edb816d21e1 1408 decode_idx = DHCP_OPTION_IDX_T2;
ICTFBI 0:4edb816d21e1 1409 break;
ICTFBI 0:4edb816d21e1 1410 default:
ICTFBI 0:4edb816d21e1 1411 decode_len = 0;
ICTFBI 0:4edb816d21e1 1412 LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
ICTFBI 0:4edb816d21e1 1413 break;
ICTFBI 0:4edb816d21e1 1414 }
ICTFBI 0:4edb816d21e1 1415 offset += len + 2;
ICTFBI 0:4edb816d21e1 1416 if (decode_len > 0) {
ICTFBI 0:4edb816d21e1 1417 u32_t value = 0;
ICTFBI 0:4edb816d21e1 1418 u16_t copy_len;
ICTFBI 0:4edb816d21e1 1419 decode_next:
ICTFBI 0:4edb816d21e1 1420 LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
ICTFBI 0:4edb816d21e1 1421 LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
ICTFBI 0:4edb816d21e1 1422 copy_len = LWIP_MIN(decode_len, 4);
ICTFBI 0:4edb816d21e1 1423 pbuf_copy_partial(q, &value, copy_len, val_offset);
ICTFBI 0:4edb816d21e1 1424 if (decode_len > 4) {
ICTFBI 0:4edb816d21e1 1425 /* decode more than one u32_t */
ICTFBI 0:4edb816d21e1 1426 LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
ICTFBI 0:4edb816d21e1 1427 dhcp_got_option(dhcp, decode_idx);
ICTFBI 0:4edb816d21e1 1428 dhcp_set_option_value(dhcp, decode_idx, htonl(value));
ICTFBI 0:4edb816d21e1 1429 decode_len -= 4;
ICTFBI 0:4edb816d21e1 1430 val_offset += 4;
ICTFBI 0:4edb816d21e1 1431 decode_idx++;
ICTFBI 0:4edb816d21e1 1432 goto decode_next;
ICTFBI 0:4edb816d21e1 1433 } else if (decode_len == 4) {
ICTFBI 0:4edb816d21e1 1434 value = ntohl(value);
ICTFBI 0:4edb816d21e1 1435 } else {
ICTFBI 0:4edb816d21e1 1436 LWIP_ASSERT("invalid decode_len", decode_len == 1);
ICTFBI 0:4edb816d21e1 1437 value = ((u8_t*)&value)[0];
ICTFBI 0:4edb816d21e1 1438 }
ICTFBI 0:4edb816d21e1 1439 dhcp_got_option(dhcp, decode_idx);
ICTFBI 0:4edb816d21e1 1440 dhcp_set_option_value(dhcp, decode_idx, value);
ICTFBI 0:4edb816d21e1 1441 }
ICTFBI 0:4edb816d21e1 1442 if (offset >= q->len) {
ICTFBI 0:4edb816d21e1 1443 offset -= q->len;
ICTFBI 0:4edb816d21e1 1444 offset_max -= q->len;
ICTFBI 0:4edb816d21e1 1445 q = q->next;
ICTFBI 0:4edb816d21e1 1446 options = (u8_t*)q->payload;
ICTFBI 0:4edb816d21e1 1447 }
ICTFBI 0:4edb816d21e1 1448 }
ICTFBI 0:4edb816d21e1 1449 /* is this an overloaded message? */
ICTFBI 0:4edb816d21e1 1450 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
ICTFBI 0:4edb816d21e1 1451 u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
ICTFBI 0:4edb816d21e1 1452 dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
ICTFBI 0:4edb816d21e1 1453 if (overload == DHCP_OVERLOAD_FILE) {
ICTFBI 0:4edb816d21e1 1454 parse_file_as_options = 1;
ICTFBI 0:4edb816d21e1 1455 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
ICTFBI 0:4edb816d21e1 1456 } else if (overload == DHCP_OVERLOAD_SNAME) {
ICTFBI 0:4edb816d21e1 1457 parse_sname_as_options = 1;
ICTFBI 0:4edb816d21e1 1458 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
ICTFBI 0:4edb816d21e1 1459 } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
ICTFBI 0:4edb816d21e1 1460 parse_sname_as_options = 1;
ICTFBI 0:4edb816d21e1 1461 parse_file_as_options = 1;
ICTFBI 0:4edb816d21e1 1462 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
ICTFBI 0:4edb816d21e1 1463 } else {
ICTFBI 0:4edb816d21e1 1464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
ICTFBI 0:4edb816d21e1 1465 }
ICTFBI 0:4edb816d21e1 1466 #if LWIP_DHCP_BOOTP_FILE
ICTFBI 0:4edb816d21e1 1467 if (!parse_file_as_options) {
ICTFBI 0:4edb816d21e1 1468 /* only do this for ACK messages */
ICTFBI 0:4edb816d21e1 1469 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
ICTFBI 0:4edb816d21e1 1470 (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
ICTFBI 0:4edb816d21e1 1471 /* copy bootp file name, don't care for sname (server hostname) */
ICTFBI 0:4edb816d21e1 1472 pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
ICTFBI 0:4edb816d21e1 1473 /* make sure the string is really NULL-terminated */
ICTFBI 0:4edb816d21e1 1474 dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
ICTFBI 0:4edb816d21e1 1475 }
ICTFBI 0:4edb816d21e1 1476 #endif /* LWIP_DHCP_BOOTP_FILE */
ICTFBI 0:4edb816d21e1 1477 }
ICTFBI 0:4edb816d21e1 1478 if (parse_file_as_options) {
ICTFBI 0:4edb816d21e1 1479 /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
ICTFBI 0:4edb816d21e1 1480 parse_file_as_options = 0;
ICTFBI 0:4edb816d21e1 1481 options_idx = DHCP_FILE_OFS;
ICTFBI 0:4edb816d21e1 1482 options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
ICTFBI 0:4edb816d21e1 1483 goto again;
ICTFBI 0:4edb816d21e1 1484 } else if (parse_sname_as_options) {
ICTFBI 0:4edb816d21e1 1485 parse_sname_as_options = 0;
ICTFBI 0:4edb816d21e1 1486 options_idx = DHCP_SNAME_OFS;
ICTFBI 0:4edb816d21e1 1487 options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
ICTFBI 0:4edb816d21e1 1488 goto again;
ICTFBI 0:4edb816d21e1 1489 }
ICTFBI 0:4edb816d21e1 1490 return ERR_OK;
ICTFBI 0:4edb816d21e1 1491 }
ICTFBI 0:4edb816d21e1 1492
ICTFBI 0:4edb816d21e1 1493 /**
ICTFBI 0:4edb816d21e1 1494 * If an incoming DHCP message is in response to us, then trigger the state machine
ICTFBI 0:4edb816d21e1 1495 */
ICTFBI 0:4edb816d21e1 1496 static void
ICTFBI 0:4edb816d21e1 1497 dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
ICTFBI 0:4edb816d21e1 1498 {
ICTFBI 0:4edb816d21e1 1499 struct netif *netif = (struct netif *)arg;
ICTFBI 0:4edb816d21e1 1500 struct dhcp *dhcp = netif->dhcp;
ICTFBI 0:4edb816d21e1 1501 struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
ICTFBI 0:4edb816d21e1 1502 u8_t msg_type;
ICTFBI 0:4edb816d21e1 1503 u8_t i;
ICTFBI 0:4edb816d21e1 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,
ICTFBI 0:4edb816d21e1 1505 ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
ICTFBI 0:4edb816d21e1 1506 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
ICTFBI 0:4edb816d21e1 1507 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
ICTFBI 0:4edb816d21e1 1508 /* prevent warnings about unused arguments */
ICTFBI 0:4edb816d21e1 1509 LWIP_UNUSED_ARG(pcb);
ICTFBI 0:4edb816d21e1 1510 LWIP_UNUSED_ARG(addr);
ICTFBI 0:4edb816d21e1 1511 LWIP_UNUSED_ARG(port);
ICTFBI 0:4edb816d21e1 1512
ICTFBI 0:4edb816d21e1 1513 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
ICTFBI 0:4edb816d21e1 1514
ICTFBI 0:4edb816d21e1 1515 if (p->len < DHCP_MIN_REPLY_LEN) {
ICTFBI 0:4edb816d21e1 1516 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
ICTFBI 0:4edb816d21e1 1517 goto free_pbuf_and_return;
ICTFBI 0:4edb816d21e1 1518 }
ICTFBI 0:4edb816d21e1 1519
ICTFBI 0:4edb816d21e1 1520 if (reply_msg->op != DHCP_BOOTREPLY) {
ICTFBI 0:4edb816d21e1 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));
ICTFBI 0:4edb816d21e1 1522 goto free_pbuf_and_return;
ICTFBI 0:4edb816d21e1 1523 }
ICTFBI 0:4edb816d21e1 1524 /* iterate through hardware address and match against DHCP message */
ICTFBI 0:4edb816d21e1 1525 for (i = 0; i < netif->hwaddr_len; i++) {
ICTFBI 0:4edb816d21e1 1526 if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
ICTFBI 0:4edb816d21e1 1527 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
ICTFBI 0:4edb816d21e1 1528 ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
ICTFBI 0:4edb816d21e1 1529 (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
ICTFBI 0:4edb816d21e1 1530 goto free_pbuf_and_return;
ICTFBI 0:4edb816d21e1 1531 }
ICTFBI 0:4edb816d21e1 1532 }
ICTFBI 0:4edb816d21e1 1533 /* match transaction ID against what we expected */
ICTFBI 0:4edb816d21e1 1534 if (ntohl(reply_msg->xid) != dhcp->xid) {
ICTFBI 0:4edb816d21e1 1535 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
ICTFBI 0:4edb816d21e1 1536 ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
ICTFBI 0:4edb816d21e1 1537 goto free_pbuf_and_return;
ICTFBI 0:4edb816d21e1 1538 }
ICTFBI 0:4edb816d21e1 1539 /* option fields could be unfold? */
ICTFBI 0:4edb816d21e1 1540 if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
ICTFBI 0:4edb816d21e1 1541 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
ICTFBI 0:4edb816d21e1 1542 ("problem unfolding DHCP message - too short on memory?\n"));
ICTFBI 0:4edb816d21e1 1543 goto free_pbuf_and_return;
ICTFBI 0:4edb816d21e1 1544 }
ICTFBI 0:4edb816d21e1 1545
ICTFBI 0:4edb816d21e1 1546 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
ICTFBI 0:4edb816d21e1 1547 /* obtain pointer to DHCP message type */
ICTFBI 0:4edb816d21e1 1548 if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
ICTFBI 0:4edb816d21e1 1549 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
ICTFBI 0:4edb816d21e1 1550 goto free_pbuf_and_return;
ICTFBI 0:4edb816d21e1 1551 }
ICTFBI 0:4edb816d21e1 1552
ICTFBI 0:4edb816d21e1 1553 /* read DHCP message type */
ICTFBI 0:4edb816d21e1 1554 msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
ICTFBI 0:4edb816d21e1 1555 /* message type is DHCP ACK? */
ICTFBI 0:4edb816d21e1 1556 if (msg_type == DHCP_ACK) {
ICTFBI 0:4edb816d21e1 1557 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
ICTFBI 0:4edb816d21e1 1558 /* in requesting state? */
ICTFBI 0:4edb816d21e1 1559 if (dhcp->state == DHCP_REQUESTING) {
ICTFBI 0:4edb816d21e1 1560 dhcp_handle_ack(netif);
ICTFBI 0:4edb816d21e1 1561 #if DHCP_DOES_ARP_CHECK
ICTFBI 0:4edb816d21e1 1562 /* check if the acknowledged lease address is already in use */
ICTFBI 0:4edb816d21e1 1563 dhcp_check(netif);
ICTFBI 0:4edb816d21e1 1564 #else
ICTFBI 0:4edb816d21e1 1565 /* bind interface to the acknowledged lease address */
ICTFBI 0:4edb816d21e1 1566 dhcp_bind(netif);
ICTFBI 0:4edb816d21e1 1567 #endif
ICTFBI 0:4edb816d21e1 1568 }
ICTFBI 0:4edb816d21e1 1569 /* already bound to the given lease address? */
ICTFBI 0:4edb816d21e1 1570 else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
ICTFBI 0:4edb816d21e1 1571 dhcp_bind(netif);
ICTFBI 0:4edb816d21e1 1572 }
ICTFBI 0:4edb816d21e1 1573 }
ICTFBI 0:4edb816d21e1 1574 /* received a DHCP_NAK in appropriate state? */
ICTFBI 0:4edb816d21e1 1575 else if ((msg_type == DHCP_NAK) &&
ICTFBI 0:4edb816d21e1 1576 ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
ICTFBI 0:4edb816d21e1 1577 (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
ICTFBI 0:4edb816d21e1 1578 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
ICTFBI 0:4edb816d21e1 1579 dhcp_handle_nak(netif);
ICTFBI 0:4edb816d21e1 1580 }
ICTFBI 0:4edb816d21e1 1581 /* received a DHCP_OFFER in DHCP_SELECTING state? */
ICTFBI 0:4edb816d21e1 1582 else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
ICTFBI 0:4edb816d21e1 1583 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
ICTFBI 0:4edb816d21e1 1584 dhcp->request_timeout = 0;
ICTFBI 0:4edb816d21e1 1585 /* remember offered lease */
ICTFBI 0:4edb816d21e1 1586 dhcp_handle_offer(netif);
ICTFBI 0:4edb816d21e1 1587 }
ICTFBI 0:4edb816d21e1 1588 free_pbuf_and_return:
ICTFBI 0:4edb816d21e1 1589 dhcp->msg_in = NULL;
ICTFBI 0:4edb816d21e1 1590 pbuf_free(p);
ICTFBI 0:4edb816d21e1 1591 }
ICTFBI 0:4edb816d21e1 1592
ICTFBI 0:4edb816d21e1 1593 /**
ICTFBI 0:4edb816d21e1 1594 * Create a DHCP request, fill in common headers
ICTFBI 0:4edb816d21e1 1595 *
ICTFBI 0:4edb816d21e1 1596 * @param netif the netif under DHCP control
ICTFBI 0:4edb816d21e1 1597 * @param dhcp dhcp control struct
ICTFBI 0:4edb816d21e1 1598 * @param message_type message type of the request
ICTFBI 0:4edb816d21e1 1599 */
ICTFBI 0:4edb816d21e1 1600 static err_t
ICTFBI 0:4edb816d21e1 1601 dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
ICTFBI 0:4edb816d21e1 1602 {
ICTFBI 0:4edb816d21e1 1603 u16_t i;
ICTFBI 0:4edb816d21e1 1604 #ifndef DHCP_GLOBAL_XID
ICTFBI 0:4edb816d21e1 1605 /** default global transaction identifier starting value (easy to match
ICTFBI 0:4edb816d21e1 1606 * with a packet analyser). We simply increment for each new request.
ICTFBI 0:4edb816d21e1 1607 * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
ICTFBI 0:4edb816d21e1 1608 * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
ICTFBI 0:4edb816d21e1 1609 static u32_t xid = 0xABCD0000;
ICTFBI 0:4edb816d21e1 1610 #else
ICTFBI 0:4edb816d21e1 1611 static u32_t xid;
ICTFBI 0:4edb816d21e1 1612 static u8_t xid_initialised = 0;
ICTFBI 0:4edb816d21e1 1613 if (!xid_initialised) {
ICTFBI 0:4edb816d21e1 1614 xid = DHCP_GLOBAL_XID;
ICTFBI 0:4edb816d21e1 1615 xid_initialised = !xid_initialised;
ICTFBI 0:4edb816d21e1 1616 }
ICTFBI 0:4edb816d21e1 1617 #endif
ICTFBI 0:4edb816d21e1 1618 LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
ICTFBI 0:4edb816d21e1 1619 LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
ICTFBI 0:4edb816d21e1 1620 LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
ICTFBI 0:4edb816d21e1 1621 LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
ICTFBI 0:4edb816d21e1 1622 dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
ICTFBI 0:4edb816d21e1 1623 if (dhcp->p_out == NULL) {
ICTFBI 0:4edb816d21e1 1624 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
ICTFBI 0:4edb816d21e1 1625 ("dhcp_create_msg(): could not allocate pbuf\n"));
ICTFBI 0:4edb816d21e1 1626 return ERR_MEM;
ICTFBI 0:4edb816d21e1 1627 }
ICTFBI 0:4edb816d21e1 1628 LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
ICTFBI 0:4edb816d21e1 1629 (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
ICTFBI 0:4edb816d21e1 1630
ICTFBI 0:4edb816d21e1 1631 /* reuse transaction identifier in retransmissions */
ICTFBI 0:4edb816d21e1 1632 if (dhcp->tries == 0) {
ICTFBI 0:4edb816d21e1 1633 xid++;
ICTFBI 0:4edb816d21e1 1634 }
ICTFBI 0:4edb816d21e1 1635 dhcp->xid = xid;
ICTFBI 0:4edb816d21e1 1636 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
ICTFBI 0:4edb816d21e1 1637 ("transaction id xid(%"X32_F")\n", xid));
ICTFBI 0:4edb816d21e1 1638
ICTFBI 0:4edb816d21e1 1639 dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
ICTFBI 0:4edb816d21e1 1640
ICTFBI 0:4edb816d21e1 1641 dhcp->msg_out->op = DHCP_BOOTREQUEST;
ICTFBI 0:4edb816d21e1 1642 /* TODO: make link layer independent */
ICTFBI 0:4edb816d21e1 1643 dhcp->msg_out->htype = DHCP_HTYPE_ETH;
ICTFBI 0:4edb816d21e1 1644 dhcp->msg_out->hlen = netif->hwaddr_len;
ICTFBI 0:4edb816d21e1 1645 dhcp->msg_out->hops = 0;
ICTFBI 0:4edb816d21e1 1646 dhcp->msg_out->xid = htonl(dhcp->xid);
ICTFBI 0:4edb816d21e1 1647 dhcp->msg_out->secs = 0;
ICTFBI 0:4edb816d21e1 1648 /* we don't need the broadcast flag since we can receive unicast traffic
ICTFBI 0:4edb816d21e1 1649 before being fully configured! */
ICTFBI 0:4edb816d21e1 1650 dhcp->msg_out->flags = 0;
ICTFBI 0:4edb816d21e1 1651 ip_addr_set_zero(&dhcp->msg_out->ciaddr);
ICTFBI 0:4edb816d21e1 1652 /* set ciaddr to netif->ip_addr based on message_type and state */
ICTFBI 0:4edb816d21e1 1653 if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
ICTFBI 0:4edb816d21e1 1654 ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
ICTFBI 0:4edb816d21e1 1655 ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
ICTFBI 0:4edb816d21e1 1656 ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
ICTFBI 0:4edb816d21e1 1657 }
ICTFBI 0:4edb816d21e1 1658 ip_addr_set_zero(&dhcp->msg_out->yiaddr);
ICTFBI 0:4edb816d21e1 1659 ip_addr_set_zero(&dhcp->msg_out->siaddr);
ICTFBI 0:4edb816d21e1 1660 ip_addr_set_zero(&dhcp->msg_out->giaddr);
ICTFBI 0:4edb816d21e1 1661 for (i = 0; i < DHCP_CHADDR_LEN; i++) {
ICTFBI 0:4edb816d21e1 1662 /* copy netif hardware address, pad with zeroes */
ICTFBI 0:4edb816d21e1 1663 dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
ICTFBI 0:4edb816d21e1 1664 }
ICTFBI 0:4edb816d21e1 1665 for (i = 0; i < DHCP_SNAME_LEN; i++) {
ICTFBI 0:4edb816d21e1 1666 dhcp->msg_out->sname[i] = 0;
ICTFBI 0:4edb816d21e1 1667 }
ICTFBI 0:4edb816d21e1 1668 for (i = 0; i < DHCP_FILE_LEN; i++) {
ICTFBI 0:4edb816d21e1 1669 dhcp->msg_out->file[i] = 0;
ICTFBI 0:4edb816d21e1 1670 }
ICTFBI 0:4edb816d21e1 1671 dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
ICTFBI 0:4edb816d21e1 1672 dhcp->options_out_len = 0;
ICTFBI 0:4edb816d21e1 1673 /* fill options field with an incrementing array (for debugging purposes) */
ICTFBI 0:4edb816d21e1 1674 for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
ICTFBI 0:4edb816d21e1 1675 dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
ICTFBI 0:4edb816d21e1 1676 }
ICTFBI 0:4edb816d21e1 1677 /* Add option MESSAGE_TYPE */
ICTFBI 0:4edb816d21e1 1678 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
ICTFBI 0:4edb816d21e1 1679 dhcp_option_byte(dhcp, message_type);
ICTFBI 0:4edb816d21e1 1680 return ERR_OK;
ICTFBI 0:4edb816d21e1 1681 }
ICTFBI 0:4edb816d21e1 1682
ICTFBI 0:4edb816d21e1 1683 /**
ICTFBI 0:4edb816d21e1 1684 * Free previously allocated memory used to send a DHCP request.
ICTFBI 0:4edb816d21e1 1685 *
ICTFBI 0:4edb816d21e1 1686 * @param dhcp the dhcp struct to free the request from
ICTFBI 0:4edb816d21e1 1687 */
ICTFBI 0:4edb816d21e1 1688 static void
ICTFBI 0:4edb816d21e1 1689 dhcp_delete_msg(struct dhcp *dhcp)
ICTFBI 0:4edb816d21e1 1690 {
ICTFBI 0:4edb816d21e1 1691 LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
ICTFBI 0:4edb816d21e1 1692 LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
ICTFBI 0:4edb816d21e1 1693 LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
ICTFBI 0:4edb816d21e1 1694 if (dhcp->p_out != NULL) {
ICTFBI 0:4edb816d21e1 1695 pbuf_free(dhcp->p_out);
ICTFBI 0:4edb816d21e1 1696 }
ICTFBI 0:4edb816d21e1 1697 dhcp->p_out = NULL;
ICTFBI 0:4edb816d21e1 1698 dhcp->msg_out = NULL;
ICTFBI 0:4edb816d21e1 1699 }
ICTFBI 0:4edb816d21e1 1700
ICTFBI 0:4edb816d21e1 1701 /**
ICTFBI 0:4edb816d21e1 1702 * Add a DHCP message trailer
ICTFBI 0:4edb816d21e1 1703 *
ICTFBI 0:4edb816d21e1 1704 * Adds the END option to the DHCP message, and if
ICTFBI 0:4edb816d21e1 1705 * necessary, up to three padding bytes.
ICTFBI 0:4edb816d21e1 1706 *
ICTFBI 0:4edb816d21e1 1707 * @param dhcp DHCP state structure
ICTFBI 0:4edb816d21e1 1708 */
ICTFBI 0:4edb816d21e1 1709 static void
ICTFBI 0:4edb816d21e1 1710 dhcp_option_trailer(struct dhcp *dhcp)
ICTFBI 0:4edb816d21e1 1711 {
ICTFBI 0:4edb816d21e1 1712 LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
ICTFBI 0:4edb816d21e1 1713 LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
ICTFBI 0:4edb816d21e1 1714 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
ICTFBI 0:4edb816d21e1 1715 dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
ICTFBI 0:4edb816d21e1 1716 /* packet is too small, or not 4 byte aligned? */
ICTFBI 0:4edb816d21e1 1717 while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
ICTFBI 0:4edb816d21e1 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)); */
ICTFBI 0:4edb816d21e1 1719 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
ICTFBI 0:4edb816d21e1 1720 /* add a fill/padding byte */
ICTFBI 0:4edb816d21e1 1721 dhcp->msg_out->options[dhcp->options_out_len++] = 0;
ICTFBI 0:4edb816d21e1 1722 }
ICTFBI 0:4edb816d21e1 1723 }
ICTFBI 0:4edb816d21e1 1724
ICTFBI 0:4edb816d21e1 1725 #endif /* LWIP_DHCP */