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lwip/core/dhcp.c@0:d7bd7384a37c, 2016-12-07 (annotated)

Committer:
grzemich
Date:
Wed Dec 07 23:47:50 2016 +0000
Revision:
0:d7bd7384a37c
dgd

Who changed what in which revision?

UserRevisionLine numberNew contents of line
grzemich 0:d7bd7384a37c 1 /**
grzemich 0:d7bd7384a37c 2 * @file
grzemich 0:d7bd7384a37c 3 * Dynamic Host Configuration Protocol client
grzemich 0:d7bd7384a37c 4 *
grzemich 0:d7bd7384a37c 5 */
grzemich 0:d7bd7384a37c 6
grzemich 0:d7bd7384a37c 7 /*
grzemich 0:d7bd7384a37c 8 *
grzemich 0:d7bd7384a37c 9 * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
grzemich 0:d7bd7384a37c 10 * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
grzemich 0:d7bd7384a37c 11 * All rights reserved.
grzemich 0:d7bd7384a37c 12 *
grzemich 0:d7bd7384a37c 13 * Redistribution and use in source and binary forms, with or without modification,
grzemich 0:d7bd7384a37c 14 * are permitted provided that the following conditions are met:
grzemich 0:d7bd7384a37c 15 *
grzemich 0:d7bd7384a37c 16 * 1. Redistributions of source code must retain the above copyright notice,
grzemich 0:d7bd7384a37c 17 * this list of conditions and the following disclaimer.
grzemich 0:d7bd7384a37c 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
grzemich 0:d7bd7384a37c 19 * this list of conditions and the following disclaimer in the documentation
grzemich 0:d7bd7384a37c 20 * and/or other materials provided with the distribution.
grzemich 0:d7bd7384a37c 21 * 3. The name of the author may not be used to endorse or promote products
grzemich 0:d7bd7384a37c 22 * derived from this software without specific prior written permission.
grzemich 0:d7bd7384a37c 23 *
grzemich 0:d7bd7384a37c 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
grzemich 0:d7bd7384a37c 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
grzemich 0:d7bd7384a37c 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
grzemich 0:d7bd7384a37c 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
grzemich 0:d7bd7384a37c 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
grzemich 0:d7bd7384a37c 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
grzemich 0:d7bd7384a37c 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
grzemich 0:d7bd7384a37c 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
grzemich 0:d7bd7384a37c 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
grzemich 0:d7bd7384a37c 33 * OF SUCH DAMAGE.
grzemich 0:d7bd7384a37c 34 *
grzemich 0:d7bd7384a37c 35 * This file is a contribution to the lwIP TCP/IP stack.
grzemich 0:d7bd7384a37c 36 * The Swedish Institute of Computer Science and Adam Dunkels
grzemich 0:d7bd7384a37c 37 * are specifically granted permission to redistribute this
grzemich 0:d7bd7384a37c 38 * source code.
grzemich 0:d7bd7384a37c 39 *
grzemich 0:d7bd7384a37c 40 * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
grzemich 0:d7bd7384a37c 41 *
grzemich 0:d7bd7384a37c 42 * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
grzemich 0:d7bd7384a37c 43 * with RFC 2131 and RFC 2132.
grzemich 0:d7bd7384a37c 44 *
grzemich 0:d7bd7384a37c 45 * TODO:
grzemich 0:d7bd7384a37c 46 * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
grzemich 0:d7bd7384a37c 47 *
grzemich 0:d7bd7384a37c 48 * Please coordinate changes and requests with Leon Woestenberg
grzemich 0:d7bd7384a37c 49 * <leon.woestenberg@gmx.net>
grzemich 0:d7bd7384a37c 50 *
grzemich 0:d7bd7384a37c 51 * Integration with your code:
grzemich 0:d7bd7384a37c 52 *
grzemich 0:d7bd7384a37c 53 * In lwip/dhcp.h
grzemich 0:d7bd7384a37c 54 * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
grzemich 0:d7bd7384a37c 55 * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
grzemich 0:d7bd7384a37c 56 *
grzemich 0:d7bd7384a37c 57 * Then have your application call dhcp_coarse_tmr() and
grzemich 0:d7bd7384a37c 58 * dhcp_fine_tmr() on the defined intervals.
grzemich 0:d7bd7384a37c 59 *
grzemich 0:d7bd7384a37c 60 * dhcp_start(struct netif *netif);
grzemich 0:d7bd7384a37c 61 * starts a DHCP client instance which configures the interface by
grzemich 0:d7bd7384a37c 62 * obtaining an IP address lease and maintaining it.
grzemich 0:d7bd7384a37c 63 *
grzemich 0:d7bd7384a37c 64 * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
grzemich 0:d7bd7384a37c 65 * to remove the DHCP client.
grzemich 0:d7bd7384a37c 66 *
grzemich 0:d7bd7384a37c 67 */
grzemich 0:d7bd7384a37c 68
grzemich 0:d7bd7384a37c 69 #include "lwip/opt.h"
grzemich 0:d7bd7384a37c 70
grzemich 0:d7bd7384a37c 71 #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
grzemich 0:d7bd7384a37c 72
grzemich 0:d7bd7384a37c 73 #include "lwip/stats.h"
grzemich 0:d7bd7384a37c 74 #include "lwip/mem.h"
grzemich 0:d7bd7384a37c 75 #include "lwip/udp.h"
grzemich 0:d7bd7384a37c 76 #include "lwip/ip_addr.h"
grzemich 0:d7bd7384a37c 77 #include "lwip/netif.h"
grzemich 0:d7bd7384a37c 78 #include "lwip/def.h"
grzemich 0:d7bd7384a37c 79 #include "lwip/sys.h"
grzemich 0:d7bd7384a37c 80 #include "lwip/dhcp.h"
grzemich 0:d7bd7384a37c 81 #include "lwip/autoip.h"
grzemich 0:d7bd7384a37c 82 #include "lwip/dns.h"
grzemich 0:d7bd7384a37c 83 #include "netif/etharp.h"
grzemich 0:d7bd7384a37c 84
grzemich 0:d7bd7384a37c 85 #include <string.h>
grzemich 0:d7bd7384a37c 86
grzemich 0:d7bd7384a37c 87 /** Default for DHCP_GLOBAL_XID is 0xABCD0000
grzemich 0:d7bd7384a37c 88 * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
grzemich 0:d7bd7384a37c 89 * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
grzemich 0:d7bd7384a37c 90 * #define DHCP_GLOBAL_XID rand()
grzemich 0:d7bd7384a37c 91 */
grzemich 0:d7bd7384a37c 92 #ifdef DHCP_GLOBAL_XID_HEADER
grzemich 0:d7bd7384a37c 93 #include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
grzemich 0:d7bd7384a37c 94 #endif
grzemich 0:d7bd7384a37c 95
grzemich 0:d7bd7384a37c 96 /** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
grzemich 0:d7bd7384a37c 97 * MTU is checked to be big enough in dhcp_start */
grzemich 0:d7bd7384a37c 98 #define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
grzemich 0:d7bd7384a37c 99 #define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
grzemich 0:d7bd7384a37c 100 /** Minimum length for reply before packet is parsed */
grzemich 0:d7bd7384a37c 101 #define DHCP_MIN_REPLY_LEN 44
grzemich 0:d7bd7384a37c 102
grzemich 0:d7bd7384a37c 103 #define REBOOT_TRIES 2
grzemich 0:d7bd7384a37c 104
grzemich 0:d7bd7384a37c 105 /** Option handling: options are parsed in dhcp_parse_reply
grzemich 0:d7bd7384a37c 106 * and saved in an array where other functions can load them from.
grzemich 0:d7bd7384a37c 107 * This might be moved into the struct dhcp (not necessarily since
grzemich 0:d7bd7384a37c 108 * lwIP is single-threaded and the array is only used while in recv
grzemich 0:d7bd7384a37c 109 * callback). */
grzemich 0:d7bd7384a37c 110 #define DHCP_OPTION_IDX_OVERLOAD 0
grzemich 0:d7bd7384a37c 111 #define DHCP_OPTION_IDX_MSG_TYPE 1
grzemich 0:d7bd7384a37c 112 #define DHCP_OPTION_IDX_SERVER_ID 2
grzemich 0:d7bd7384a37c 113 #define DHCP_OPTION_IDX_LEASE_TIME 3
grzemich 0:d7bd7384a37c 114 #define DHCP_OPTION_IDX_T1 4
grzemich 0:d7bd7384a37c 115 #define DHCP_OPTION_IDX_T2 5
grzemich 0:d7bd7384a37c 116 #define DHCP_OPTION_IDX_SUBNET_MASK 6
grzemich 0:d7bd7384a37c 117 #define DHCP_OPTION_IDX_ROUTER 7
grzemich 0:d7bd7384a37c 118 #define DHCP_OPTION_IDX_DNS_SERVER 8
grzemich 0:d7bd7384a37c 119 #define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
grzemich 0:d7bd7384a37c 120
grzemich 0:d7bd7384a37c 121 /** Holds the decoded option values, only valid while in dhcp_recv.
grzemich 0:d7bd7384a37c 122 @todo: move this into struct dhcp? */
grzemich 0:d7bd7384a37c 123 u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
grzemich 0:d7bd7384a37c 124 /** Holds a flag which option was received and is contained in dhcp_rx_options_val,
grzemich 0:d7bd7384a37c 125 only valid while in dhcp_recv.
grzemich 0:d7bd7384a37c 126 @todo: move this into struct dhcp? */
grzemich 0:d7bd7384a37c 127 u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
grzemich 0:d7bd7384a37c 128
grzemich 0:d7bd7384a37c 129 #define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
grzemich 0:d7bd7384a37c 130 #define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
grzemich 0:d7bd7384a37c 131 #define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
grzemich 0:d7bd7384a37c 132 #define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
grzemich 0:d7bd7384a37c 133 #define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
grzemich 0:d7bd7384a37c 134 #define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
grzemich 0:d7bd7384a37c 135
grzemich 0:d7bd7384a37c 136
grzemich 0:d7bd7384a37c 137 /* DHCP client state machine functions */
grzemich 0:d7bd7384a37c 138 static err_t dhcp_discover(struct netif *netif);
grzemich 0:d7bd7384a37c 139 static err_t dhcp_select(struct netif *netif);
grzemich 0:d7bd7384a37c 140 static void dhcp_bind(struct netif *netif);
grzemich 0:d7bd7384a37c 141 #if DHCP_DOES_ARP_CHECK
grzemich 0:d7bd7384a37c 142 static err_t dhcp_decline(struct netif *netif);
grzemich 0:d7bd7384a37c 143 #endif /* DHCP_DOES_ARP_CHECK */
grzemich 0:d7bd7384a37c 144 static err_t dhcp_rebind(struct netif *netif);
grzemich 0:d7bd7384a37c 145 static err_t dhcp_reboot(struct netif *netif);
grzemich 0:d7bd7384a37c 146 static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
grzemich 0:d7bd7384a37c 147
grzemich 0:d7bd7384a37c 148 /* receive, unfold, parse and free incoming messages */
grzemich 0:d7bd7384a37c 149 static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
grzemich 0:d7bd7384a37c 150
grzemich 0:d7bd7384a37c 151 /* set the DHCP timers */
grzemich 0:d7bd7384a37c 152 static void dhcp_timeout(struct netif *netif);
grzemich 0:d7bd7384a37c 153 static void dhcp_t1_timeout(struct netif *netif);
grzemich 0:d7bd7384a37c 154 static void dhcp_t2_timeout(struct netif *netif);
grzemich 0:d7bd7384a37c 155
grzemich 0:d7bd7384a37c 156 /* build outgoing messages */
grzemich 0:d7bd7384a37c 157 /* create a DHCP message, fill in common headers */
grzemich 0:d7bd7384a37c 158 static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
grzemich 0:d7bd7384a37c 159 /* free a DHCP request */
grzemich 0:d7bd7384a37c 160 static void dhcp_delete_msg(struct dhcp *dhcp);
grzemich 0:d7bd7384a37c 161 /* add a DHCP option (type, then length in bytes) */
grzemich 0:d7bd7384a37c 162 static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
grzemich 0:d7bd7384a37c 163 /* add option values */
grzemich 0:d7bd7384a37c 164 static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
grzemich 0:d7bd7384a37c 165 static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
grzemich 0:d7bd7384a37c 166 static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
grzemich 0:d7bd7384a37c 167 /* always add the DHCP options trailer to end and pad */
grzemich 0:d7bd7384a37c 168 static void dhcp_option_trailer(struct dhcp *dhcp);
grzemich 0:d7bd7384a37c 169
grzemich 0:d7bd7384a37c 170 /**
grzemich 0:d7bd7384a37c 171 * Back-off the DHCP client (because of a received NAK response).
grzemich 0:d7bd7384a37c 172 *
grzemich 0:d7bd7384a37c 173 * Back-off the DHCP client because of a received NAK. Receiving a
grzemich 0:d7bd7384a37c 174 * NAK means the client asked for something non-sensible, for
grzemich 0:d7bd7384a37c 175 * example when it tries to renew a lease obtained on another network.
grzemich 0:d7bd7384a37c 176 *
grzemich 0:d7bd7384a37c 177 * We clear any existing set IP address and restart DHCP negotiation
grzemich 0:d7bd7384a37c 178 * afresh (as per RFC2131 3.2.3).
grzemich 0:d7bd7384a37c 179 *
grzemich 0:d7bd7384a37c 180 * @param netif the netif under DHCP control
grzemich 0:d7bd7384a37c 181 */
grzemich 0:d7bd7384a37c 182 static void
grzemich 0:d7bd7384a37c 183 dhcp_handle_nak(struct netif *netif)
grzemich 0:d7bd7384a37c 184 {
grzemich 0:d7bd7384a37c 185 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
grzemich 0:d7bd7384a37c 187 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
grzemich 0:d7bd7384a37c 188 /* Set the interface down since the address must no longer be used, as per RFC2131 */
grzemich 0:d7bd7384a37c 189 netif_set_down(netif);
grzemich 0:d7bd7384a37c 190 /* remove IP address from interface */
grzemich 0:d7bd7384a37c 191 netif_set_ipaddr(netif, IP_ADDR_ANY);
grzemich 0:d7bd7384a37c 192 netif_set_gw(netif, IP_ADDR_ANY);
grzemich 0:d7bd7384a37c 193 netif_set_netmask(netif, IP_ADDR_ANY);
grzemich 0:d7bd7384a37c 194 /* Change to a defined state */
grzemich 0:d7bd7384a37c 195 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
grzemich 0:d7bd7384a37c 196 /* We can immediately restart discovery */
grzemich 0:d7bd7384a37c 197 dhcp_discover(netif);
grzemich 0:d7bd7384a37c 198 }
grzemich 0:d7bd7384a37c 199
grzemich 0:d7bd7384a37c 200 #if DHCP_DOES_ARP_CHECK
grzemich 0:d7bd7384a37c 201 /**
grzemich 0:d7bd7384a37c 202 * Checks if the offered IP address is already in use.
grzemich 0:d7bd7384a37c 203 *
grzemich 0:d7bd7384a37c 204 * It does so by sending an ARP request for the offered address and
grzemich 0:d7bd7384a37c 205 * entering CHECKING state. If no ARP reply is received within a small
grzemich 0:d7bd7384a37c 206 * interval, the address is assumed to be free for use by us.
grzemich 0:d7bd7384a37c 207 *
grzemich 0:d7bd7384a37c 208 * @param netif the netif under DHCP control
grzemich 0:d7bd7384a37c 209 */
grzemich 0:d7bd7384a37c 210 static void
grzemich 0:d7bd7384a37c 211 dhcp_check(struct netif *netif)
grzemich 0:d7bd7384a37c 212 {
grzemich 0:d7bd7384a37c 213 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 214 err_t result;
grzemich 0:d7bd7384a37c 215 u16_t msecs;
grzemich 0:d7bd7384a37c 216 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
grzemich 0:d7bd7384a37c 217 (s16_t)netif->name[1]));
grzemich 0:d7bd7384a37c 218 dhcp_set_state(dhcp, DHCP_CHECKING);
grzemich 0:d7bd7384a37c 219 /* create an ARP query for the offered IP address, expecting that no host
grzemich 0:d7bd7384a37c 220 responds, as the IP address should not be in use. */
grzemich 0:d7bd7384a37c 221 result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
grzemich 0:d7bd7384a37c 222 if (result != ERR_OK) {
grzemich 0:d7bd7384a37c 223 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
grzemich 0:d7bd7384a37c 224 }
grzemich 0:d7bd7384a37c 225 dhcp->tries++;
grzemich 0:d7bd7384a37c 226 msecs = 500;
grzemich 0:d7bd7384a37c 227 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
grzemich 0:d7bd7384a37c 228 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
grzemich 0:d7bd7384a37c 229 }
grzemich 0:d7bd7384a37c 230 #endif /* DHCP_DOES_ARP_CHECK */
grzemich 0:d7bd7384a37c 231
grzemich 0:d7bd7384a37c 232 /**
grzemich 0:d7bd7384a37c 233 * Remember the configuration offered by a DHCP server.
grzemich 0:d7bd7384a37c 234 *
grzemich 0:d7bd7384a37c 235 * @param netif the netif under DHCP control
grzemich 0:d7bd7384a37c 236 */
grzemich 0:d7bd7384a37c 237 static void
grzemich 0:d7bd7384a37c 238 dhcp_handle_offer(struct netif *netif)
grzemich 0:d7bd7384a37c 239 {
grzemich 0:d7bd7384a37c 240 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 241 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
grzemich 0:d7bd7384a37c 242 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
grzemich 0:d7bd7384a37c 243 /* obtain the server address */
grzemich 0:d7bd7384a37c 244 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
grzemich 0:d7bd7384a37c 245 ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
grzemich 0:d7bd7384a37c 246 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
grzemich 0:d7bd7384a37c 247 ip4_addr_get_u32(&dhcp->server_ip_addr)));
grzemich 0:d7bd7384a37c 248 /* remember offered address */
grzemich 0:d7bd7384a37c 249 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
grzemich 0:d7bd7384a37c 250 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
grzemich 0:d7bd7384a37c 251 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
grzemich 0:d7bd7384a37c 252
grzemich 0:d7bd7384a37c 253 dhcp_select(netif);
grzemich 0:d7bd7384a37c 254 } else {
grzemich 0:d7bd7384a37c 255 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
grzemich 0:d7bd7384a37c 256 ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
grzemich 0:d7bd7384a37c 257 }
grzemich 0:d7bd7384a37c 258 }
grzemich 0:d7bd7384a37c 259
grzemich 0:d7bd7384a37c 260 /**
grzemich 0:d7bd7384a37c 261 * Select a DHCP server offer out of all offers.
grzemich 0:d7bd7384a37c 262 *
grzemich 0:d7bd7384a37c 263 * Simply select the first offer received.
grzemich 0:d7bd7384a37c 264 *
grzemich 0:d7bd7384a37c 265 * @param netif the netif under DHCP control
grzemich 0:d7bd7384a37c 266 * @return lwIP specific error (see error.h)
grzemich 0:d7bd7384a37c 267 */
grzemich 0:d7bd7384a37c 268 static err_t
grzemich 0:d7bd7384a37c 269 dhcp_select(struct netif *netif)
grzemich 0:d7bd7384a37c 270 {
grzemich 0:d7bd7384a37c 271 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 272 err_t result;
grzemich 0:d7bd7384a37c 273 u16_t msecs;
grzemich 0:d7bd7384a37c 274
grzemich 0:d7bd7384a37c 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));
grzemich 0:d7bd7384a37c 276 dhcp_set_state(dhcp, DHCP_REQUESTING);
grzemich 0:d7bd7384a37c 277
grzemich 0:d7bd7384a37c 278 /* create and initialize the DHCP message header */
grzemich 0:d7bd7384a37c 279 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
grzemich 0:d7bd7384a37c 280 if (result == ERR_OK) {
grzemich 0:d7bd7384a37c 281 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
grzemich 0:d7bd7384a37c 282 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
grzemich 0:d7bd7384a37c 283
grzemich 0:d7bd7384a37c 284 /* MUST request the offered IP address */
grzemich 0:d7bd7384a37c 285 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
grzemich 0:d7bd7384a37c 286 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
grzemich 0:d7bd7384a37c 287
grzemich 0:d7bd7384a37c 288 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
grzemich 0:d7bd7384a37c 289 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
grzemich 0:d7bd7384a37c 290
grzemich 0:d7bd7384a37c 291 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
grzemich 0:d7bd7384a37c 292 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
grzemich 0:d7bd7384a37c 293 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
grzemich 0:d7bd7384a37c 294 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
grzemich 0:d7bd7384a37c 295 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
grzemich 0:d7bd7384a37c 296
grzemich 0:d7bd7384a37c 297 #if LWIP_NETIF_HOSTNAME
grzemich 0:d7bd7384a37c 298 if (netif->hostname != NULL) {
grzemich 0:d7bd7384a37c 299 const char *p = (const char*)netif->hostname;
grzemich 0:d7bd7384a37c 300 u8_t namelen = (u8_t)strlen(p);
grzemich 0:d7bd7384a37c 301 if (namelen > 0) {
grzemich 0:d7bd7384a37c 302 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
grzemich 0:d7bd7384a37c 303 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
grzemich 0:d7bd7384a37c 304 while (*p) {
grzemich 0:d7bd7384a37c 305 dhcp_option_byte(dhcp, *p++);
grzemich 0:d7bd7384a37c 306 }
grzemich 0:d7bd7384a37c 307 }
grzemich 0:d7bd7384a37c 308 }
grzemich 0:d7bd7384a37c 309 #endif /* LWIP_NETIF_HOSTNAME */
grzemich 0:d7bd7384a37c 310
grzemich 0:d7bd7384a37c 311 dhcp_option_trailer(dhcp);
grzemich 0:d7bd7384a37c 312 /* shrink the pbuf to the actual content length */
grzemich 0:d7bd7384a37c 313 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
grzemich 0:d7bd7384a37c 314
grzemich 0:d7bd7384a37c 315 /* send broadcast to any DHCP server */
grzemich 0:d7bd7384a37c 316 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
grzemich 0:d7bd7384a37c 317 dhcp_delete_msg(dhcp);
grzemich 0:d7bd7384a37c 318 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
grzemich 0:d7bd7384a37c 319 } else {
grzemich 0:d7bd7384a37c 320 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
grzemich 0:d7bd7384a37c 321 }
grzemich 0:d7bd7384a37c 322 dhcp->tries++;
grzemich 0:d7bd7384a37c 323 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
grzemich 0:d7bd7384a37c 324 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
grzemich 0:d7bd7384a37c 325 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
grzemich 0:d7bd7384a37c 326 return result;
grzemich 0:d7bd7384a37c 327 }
grzemich 0:d7bd7384a37c 328
grzemich 0:d7bd7384a37c 329 /**
grzemich 0:d7bd7384a37c 330 * The DHCP timer that checks for lease renewal/rebind timeouts.
grzemich 0:d7bd7384a37c 331 */
grzemich 0:d7bd7384a37c 332 void
grzemich 0:d7bd7384a37c 333 dhcp_coarse_tmr()
grzemich 0:d7bd7384a37c 334 {
grzemich 0:d7bd7384a37c 335 struct netif *netif = netif_list;
grzemich 0:d7bd7384a37c 336 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
grzemich 0:d7bd7384a37c 337 /* iterate through all network interfaces */
grzemich 0:d7bd7384a37c 338 while (netif != NULL) {
grzemich 0:d7bd7384a37c 339 /* only act on DHCP configured interfaces */
grzemich 0:d7bd7384a37c 340 if (netif->dhcp != NULL) {
grzemich 0:d7bd7384a37c 341 /* timer is active (non zero), and triggers (zeroes) now? */
grzemich 0:d7bd7384a37c 342 if (netif->dhcp->t2_timeout-- == 1) {
grzemich 0:d7bd7384a37c 343 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
grzemich 0:d7bd7384a37c 344 /* this clients' rebind timeout triggered */
grzemich 0:d7bd7384a37c 345 dhcp_t2_timeout(netif);
grzemich 0:d7bd7384a37c 346 /* timer is active (non zero), and triggers (zeroes) now */
grzemich 0:d7bd7384a37c 347 } else if (netif->dhcp->t1_timeout-- == 1) {
grzemich 0:d7bd7384a37c 348 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
grzemich 0:d7bd7384a37c 349 /* this clients' renewal timeout triggered */
grzemich 0:d7bd7384a37c 350 dhcp_t1_timeout(netif);
grzemich 0:d7bd7384a37c 351 }
grzemich 0:d7bd7384a37c 352 }
grzemich 0:d7bd7384a37c 353 /* proceed to next netif */
grzemich 0:d7bd7384a37c 354 netif = netif->next;
grzemich 0:d7bd7384a37c 355 }
grzemich 0:d7bd7384a37c 356 }
grzemich 0:d7bd7384a37c 357
grzemich 0:d7bd7384a37c 358 /**
grzemich 0:d7bd7384a37c 359 * DHCP transaction timeout handling
grzemich 0:d7bd7384a37c 360 *
grzemich 0:d7bd7384a37c 361 * A DHCP server is expected to respond within a short period of time.
grzemich 0:d7bd7384a37c 362 * This timer checks whether an outstanding DHCP request is timed out.
grzemich 0:d7bd7384a37c 363 */
grzemich 0:d7bd7384a37c 364 void
grzemich 0:d7bd7384a37c 365 dhcp_fine_tmr()
grzemich 0:d7bd7384a37c 366 {
grzemich 0:d7bd7384a37c 367 struct netif *netif = netif_list;
grzemich 0:d7bd7384a37c 368 /* loop through netif's */
grzemich 0:d7bd7384a37c 369 while (netif != NULL) {
grzemich 0:d7bd7384a37c 370 /* only act on DHCP configured interfaces */
grzemich 0:d7bd7384a37c 371 if (netif->dhcp != NULL) {
grzemich 0:d7bd7384a37c 372 /* timer is active (non zero), and is about to trigger now */
grzemich 0:d7bd7384a37c 373 if (netif->dhcp->request_timeout > 1) {
grzemich 0:d7bd7384a37c 374 netif->dhcp->request_timeout--;
grzemich 0:d7bd7384a37c 375 }
grzemich 0:d7bd7384a37c 376 else if (netif->dhcp->request_timeout == 1) {
grzemich 0:d7bd7384a37c 377 netif->dhcp->request_timeout--;
grzemich 0:d7bd7384a37c 378 /* { netif->dhcp->request_timeout == 0 } */
grzemich 0:d7bd7384a37c 379 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
grzemich 0:d7bd7384a37c 380 /* this client's request timeout triggered */
grzemich 0:d7bd7384a37c 381 dhcp_timeout(netif);
grzemich 0:d7bd7384a37c 382 }
grzemich 0:d7bd7384a37c 383 }
grzemich 0:d7bd7384a37c 384 /* proceed to next network interface */
grzemich 0:d7bd7384a37c 385 netif = netif->next;
grzemich 0:d7bd7384a37c 386 }
grzemich 0:d7bd7384a37c 387 }
grzemich 0:d7bd7384a37c 388
grzemich 0:d7bd7384a37c 389 /**
grzemich 0:d7bd7384a37c 390 * A DHCP negotiation transaction, or ARP request, has timed out.
grzemich 0:d7bd7384a37c 391 *
grzemich 0:d7bd7384a37c 392 * The timer that was started with the DHCP or ARP request has
grzemich 0:d7bd7384a37c 393 * timed out, indicating no response was received in time.
grzemich 0:d7bd7384a37c 394 *
grzemich 0:d7bd7384a37c 395 * @param netif the netif under DHCP control
grzemich 0:d7bd7384a37c 396 */
grzemich 0:d7bd7384a37c 397 static void
grzemich 0:d7bd7384a37c 398 dhcp_timeout(struct netif *netif)
grzemich 0:d7bd7384a37c 399 {
grzemich 0:d7bd7384a37c 400 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 401 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
grzemich 0:d7bd7384a37c 402 /* back-off period has passed, or server selection timed out */
grzemich 0:d7bd7384a37c 403 if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
grzemich 0:d7bd7384a37c 404 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
grzemich 0:d7bd7384a37c 405 dhcp_discover(netif);
grzemich 0:d7bd7384a37c 406 /* receiving the requested lease timed out */
grzemich 0:d7bd7384a37c 407 } else if (dhcp->state == DHCP_REQUESTING) {
grzemich 0:d7bd7384a37c 408 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
grzemich 0:d7bd7384a37c 409 if (dhcp->tries <= 5) {
grzemich 0:d7bd7384a37c 410 dhcp_select(netif);
grzemich 0:d7bd7384a37c 411 } else {
grzemich 0:d7bd7384a37c 412 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
grzemich 0:d7bd7384a37c 413 dhcp_release(netif);
grzemich 0:d7bd7384a37c 414 dhcp_discover(netif);
grzemich 0:d7bd7384a37c 415 }
grzemich 0:d7bd7384a37c 416 #if DHCP_DOES_ARP_CHECK
grzemich 0:d7bd7384a37c 417 /* received no ARP reply for the offered address (which is good) */
grzemich 0:d7bd7384a37c 418 } else if (dhcp->state == DHCP_CHECKING) {
grzemich 0:d7bd7384a37c 419 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
grzemich 0:d7bd7384a37c 420 if (dhcp->tries <= 1) {
grzemich 0:d7bd7384a37c 421 dhcp_check(netif);
grzemich 0:d7bd7384a37c 422 /* no ARP replies on the offered address,
grzemich 0:d7bd7384a37c 423 looks like the IP address is indeed free */
grzemich 0:d7bd7384a37c 424 } else {
grzemich 0:d7bd7384a37c 425 /* bind the interface to the offered address */
grzemich 0:d7bd7384a37c 426 dhcp_bind(netif);
grzemich 0:d7bd7384a37c 427 }
grzemich 0:d7bd7384a37c 428 #endif /* DHCP_DOES_ARP_CHECK */
grzemich 0:d7bd7384a37c 429 }
grzemich 0:d7bd7384a37c 430 /* did not get response to renew request? */
grzemich 0:d7bd7384a37c 431 else if (dhcp->state == DHCP_RENEWING) {
grzemich 0:d7bd7384a37c 432 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
grzemich 0:d7bd7384a37c 433 /* just retry renewal */
grzemich 0:d7bd7384a37c 434 /* note that the rebind timer will eventually time-out if renew does not work */
grzemich 0:d7bd7384a37c 435 dhcp_renew(netif);
grzemich 0:d7bd7384a37c 436 /* did not get response to rebind request? */
grzemich 0:d7bd7384a37c 437 } else if (dhcp->state == DHCP_REBINDING) {
grzemich 0:d7bd7384a37c 438 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
grzemich 0:d7bd7384a37c 439 if (dhcp->tries <= 8) {
grzemich 0:d7bd7384a37c 440 dhcp_rebind(netif);
grzemich 0:d7bd7384a37c 441 } else {
grzemich 0:d7bd7384a37c 442 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
grzemich 0:d7bd7384a37c 443 dhcp_release(netif);
grzemich 0:d7bd7384a37c 444 dhcp_discover(netif);
grzemich 0:d7bd7384a37c 445 }
grzemich 0:d7bd7384a37c 446 } else if (dhcp->state == DHCP_REBOOTING) {
grzemich 0:d7bd7384a37c 447 if (dhcp->tries < REBOOT_TRIES) {
grzemich 0:d7bd7384a37c 448 dhcp_reboot(netif);
grzemich 0:d7bd7384a37c 449 } else {
grzemich 0:d7bd7384a37c 450 dhcp_discover(netif);
grzemich 0:d7bd7384a37c 451 }
grzemich 0:d7bd7384a37c 452 }
grzemich 0:d7bd7384a37c 453 }
grzemich 0:d7bd7384a37c 454
grzemich 0:d7bd7384a37c 455 /**
grzemich 0:d7bd7384a37c 456 * The renewal period has timed out.
grzemich 0:d7bd7384a37c 457 *
grzemich 0:d7bd7384a37c 458 * @param netif the netif under DHCP control
grzemich 0:d7bd7384a37c 459 */
grzemich 0:d7bd7384a37c 460 static void
grzemich 0:d7bd7384a37c 461 dhcp_t1_timeout(struct netif *netif)
grzemich 0:d7bd7384a37c 462 {
grzemich 0:d7bd7384a37c 463 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
grzemich 0:d7bd7384a37c 465 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
grzemich 0:d7bd7384a37c 466 (dhcp->state == DHCP_RENEWING)) {
grzemich 0:d7bd7384a37c 467 /* just retry to renew - note that the rebind timer (t2) will
grzemich 0:d7bd7384a37c 468 * eventually time-out if renew tries fail. */
grzemich 0:d7bd7384a37c 469 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
grzemich 0:d7bd7384a37c 470 ("dhcp_t1_timeout(): must renew\n"));
grzemich 0:d7bd7384a37c 471 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
grzemich 0:d7bd7384a37c 472 DHCP_RENEWING, not DHCP_BOUND */
grzemich 0:d7bd7384a37c 473 dhcp_renew(netif);
grzemich 0:d7bd7384a37c 474 }
grzemich 0:d7bd7384a37c 475 }
grzemich 0:d7bd7384a37c 476
grzemich 0:d7bd7384a37c 477 /**
grzemich 0:d7bd7384a37c 478 * The rebind period has timed out.
grzemich 0:d7bd7384a37c 479 *
grzemich 0:d7bd7384a37c 480 * @param netif the netif under DHCP control
grzemich 0:d7bd7384a37c 481 */
grzemich 0:d7bd7384a37c 482 static void
grzemich 0:d7bd7384a37c 483 dhcp_t2_timeout(struct netif *netif)
grzemich 0:d7bd7384a37c 484 {
grzemich 0:d7bd7384a37c 485 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 486 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
grzemich 0:d7bd7384a37c 487 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
grzemich 0:d7bd7384a37c 488 (dhcp->state == DHCP_RENEWING)) {
grzemich 0:d7bd7384a37c 489 /* just retry to rebind */
grzemich 0:d7bd7384a37c 490 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
grzemich 0:d7bd7384a37c 491 ("dhcp_t2_timeout(): must rebind\n"));
grzemich 0:d7bd7384a37c 492 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
grzemich 0:d7bd7384a37c 493 DHCP_REBINDING, not DHCP_BOUND */
grzemich 0:d7bd7384a37c 494 dhcp_rebind(netif);
grzemich 0:d7bd7384a37c 495 }
grzemich 0:d7bd7384a37c 496 }
grzemich 0:d7bd7384a37c 497
grzemich 0:d7bd7384a37c 498 /**
grzemich 0:d7bd7384a37c 499 * Handle a DHCP ACK packet
grzemich 0:d7bd7384a37c 500 *
grzemich 0:d7bd7384a37c 501 * @param netif the netif under DHCP control
grzemich 0:d7bd7384a37c 502 */
grzemich 0:d7bd7384a37c 503 static void
grzemich 0:d7bd7384a37c 504 dhcp_handle_ack(struct netif *netif)
grzemich 0:d7bd7384a37c 505 {
grzemich 0:d7bd7384a37c 506 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 507 #if LWIP_DNS
grzemich 0:d7bd7384a37c 508 u8_t n;
grzemich 0:d7bd7384a37c 509 #endif /* LWIP_DNS */
grzemich 0:d7bd7384a37c 510
grzemich 0:d7bd7384a37c 511 /* clear options we might not get from the ACK */
grzemich 0:d7bd7384a37c 512 ip_addr_set_zero(&dhcp->offered_sn_mask);
grzemich 0:d7bd7384a37c 513 ip_addr_set_zero(&dhcp->offered_gw_addr);
grzemich 0:d7bd7384a37c 514 #if LWIP_DHCP_BOOTP_FILE
grzemich 0:d7bd7384a37c 515 ip_addr_set_zero(&dhcp->offered_si_addr);
grzemich 0:d7bd7384a37c 516 #endif /* LWIP_DHCP_BOOTP_FILE */
grzemich 0:d7bd7384a37c 517
grzemich 0:d7bd7384a37c 518 /* lease time given? */
grzemich 0:d7bd7384a37c 519 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
grzemich 0:d7bd7384a37c 520 /* remember offered lease time */
grzemich 0:d7bd7384a37c 521 dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
grzemich 0:d7bd7384a37c 522 }
grzemich 0:d7bd7384a37c 523 /* renewal period given? */
grzemich 0:d7bd7384a37c 524 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
grzemich 0:d7bd7384a37c 525 /* remember given renewal period */
grzemich 0:d7bd7384a37c 526 dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
grzemich 0:d7bd7384a37c 527 } else {
grzemich 0:d7bd7384a37c 528 /* calculate safe periods for renewal */
grzemich 0:d7bd7384a37c 529 dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
grzemich 0:d7bd7384a37c 530 }
grzemich 0:d7bd7384a37c 531
grzemich 0:d7bd7384a37c 532 /* renewal period given? */
grzemich 0:d7bd7384a37c 533 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
grzemich 0:d7bd7384a37c 534 /* remember given rebind period */
grzemich 0:d7bd7384a37c 535 dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
grzemich 0:d7bd7384a37c 536 } else {
grzemich 0:d7bd7384a37c 537 /* calculate safe periods for rebinding */
grzemich 0:d7bd7384a37c 538 dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
grzemich 0:d7bd7384a37c 539 }
grzemich 0:d7bd7384a37c 540
grzemich 0:d7bd7384a37c 541 /* (y)our internet address */
grzemich 0:d7bd7384a37c 542 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
grzemich 0:d7bd7384a37c 543
grzemich 0:d7bd7384a37c 544 #if LWIP_DHCP_BOOTP_FILE
grzemich 0:d7bd7384a37c 545 /* copy boot server address,
grzemich 0:d7bd7384a37c 546 boot file name copied in dhcp_parse_reply if not overloaded */
grzemich 0:d7bd7384a37c 547 ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
grzemich 0:d7bd7384a37c 548 #endif /* LWIP_DHCP_BOOTP_FILE */
grzemich 0:d7bd7384a37c 549
grzemich 0:d7bd7384a37c 550 /* subnet mask given? */
grzemich 0:d7bd7384a37c 551 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
grzemich 0:d7bd7384a37c 552 /* remember given subnet mask */
grzemich 0:d7bd7384a37c 553 ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
grzemich 0:d7bd7384a37c 554 dhcp->subnet_mask_given = 1;
grzemich 0:d7bd7384a37c 555 } else {
grzemich 0:d7bd7384a37c 556 dhcp->subnet_mask_given = 0;
grzemich 0:d7bd7384a37c 557 }
grzemich 0:d7bd7384a37c 558
grzemich 0:d7bd7384a37c 559 /* gateway router */
grzemich 0:d7bd7384a37c 560 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
grzemich 0:d7bd7384a37c 561 ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
grzemich 0:d7bd7384a37c 562 }
grzemich 0:d7bd7384a37c 563
grzemich 0:d7bd7384a37c 564 #if LWIP_DNS
grzemich 0:d7bd7384a37c 565 /* DNS servers */
grzemich 0:d7bd7384a37c 566 n = 0;
grzemich 0:d7bd7384a37c 567 while((n < DNS_MAX_SERVERS) && dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)) {
grzemich 0:d7bd7384a37c 568 ip_addr_t dns_addr;
grzemich 0:d7bd7384a37c 569 ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
grzemich 0:d7bd7384a37c 570 dns_setserver(n, &dns_addr);
grzemich 0:d7bd7384a37c 571 n++;
grzemich 0:d7bd7384a37c 572 }
grzemich 0:d7bd7384a37c 573 #endif /* LWIP_DNS */
grzemich 0:d7bd7384a37c 574 }
grzemich 0:d7bd7384a37c 575
grzemich 0:d7bd7384a37c 576 /** Set a statically allocated struct dhcp to work with.
grzemich 0:d7bd7384a37c 577 * Using this prevents dhcp_start to allocate it using mem_malloc.
grzemich 0:d7bd7384a37c 578 *
grzemich 0:d7bd7384a37c 579 * @param netif the netif for which to set the struct dhcp
grzemich 0:d7bd7384a37c 580 * @param dhcp (uninitialised) dhcp struct allocated by the application
grzemich 0:d7bd7384a37c 581 */
grzemich 0:d7bd7384a37c 582 void
grzemich 0:d7bd7384a37c 583 dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
grzemich 0:d7bd7384a37c 584 {
grzemich 0:d7bd7384a37c 585 LWIP_ASSERT("netif != NULL", netif != NULL);
grzemich 0:d7bd7384a37c 586 LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
grzemich 0:d7bd7384a37c 587 LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
grzemich 0:d7bd7384a37c 588
grzemich 0:d7bd7384a37c 589 /* clear data structure */
grzemich 0:d7bd7384a37c 590 memset(dhcp, 0, sizeof(struct dhcp));
grzemich 0:d7bd7384a37c 591 /* dhcp_set_state(&dhcp, DHCP_OFF); */
grzemich 0:d7bd7384a37c 592 netif->dhcp = dhcp;
grzemich 0:d7bd7384a37c 593 }
grzemich 0:d7bd7384a37c 594
grzemich 0:d7bd7384a37c 595 /** Removes a struct dhcp from a netif.
grzemich 0:d7bd7384a37c 596 *
grzemich 0:d7bd7384a37c 597 * ATTENTION: Only use this when not using dhcp_set_struct() to allocate the
grzemich 0:d7bd7384a37c 598 * struct dhcp since the memory is passed back to the heap.
grzemich 0:d7bd7384a37c 599 *
grzemich 0:d7bd7384a37c 600 * @param netif the netif from which to remove the struct dhcp
grzemich 0:d7bd7384a37c 601 */
grzemich 0:d7bd7384a37c 602 void dhcp_cleanup(struct netif *netif)
grzemich 0:d7bd7384a37c 603 {
grzemich 0:d7bd7384a37c 604 LWIP_ASSERT("netif != NULL", netif != NULL);
grzemich 0:d7bd7384a37c 605
grzemich 0:d7bd7384a37c 606 if (netif->dhcp != NULL) {
grzemich 0:d7bd7384a37c 607 mem_free(netif->dhcp);
grzemich 0:d7bd7384a37c 608 netif->dhcp = NULL;
grzemich 0:d7bd7384a37c 609 }
grzemich 0:d7bd7384a37c 610 }
grzemich 0:d7bd7384a37c 611
grzemich 0:d7bd7384a37c 612 /**
grzemich 0:d7bd7384a37c 613 * Start DHCP negotiation for a network interface.
grzemich 0:d7bd7384a37c 614 *
grzemich 0:d7bd7384a37c 615 * If no DHCP client instance was attached to this interface,
grzemich 0:d7bd7384a37c 616 * a new client is created first. If a DHCP client instance
grzemich 0:d7bd7384a37c 617 * was already present, it restarts negotiation.
grzemich 0:d7bd7384a37c 618 *
grzemich 0:d7bd7384a37c 619 * @param netif The lwIP network interface
grzemich 0:d7bd7384a37c 620 * @return lwIP error code
grzemich 0:d7bd7384a37c 621 * - ERR_OK - No error
grzemich 0:d7bd7384a37c 622 * - ERR_MEM - Out of memory
grzemich 0:d7bd7384a37c 623 */
grzemich 0:d7bd7384a37c 624 err_t
grzemich 0:d7bd7384a37c 625 dhcp_start(struct netif *netif)
grzemich 0:d7bd7384a37c 626 {
grzemich 0:d7bd7384a37c 627 struct dhcp *dhcp;
grzemich 0:d7bd7384a37c 628 err_t result = ERR_OK;
grzemich 0:d7bd7384a37c 629
grzemich 0:d7bd7384a37c 630 LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
grzemich 0:d7bd7384a37c 631 dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 632 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));
grzemich 0:d7bd7384a37c 633 /* Remove the flag that says this netif is handled by DHCP,
grzemich 0:d7bd7384a37c 634 it is set when we succeeded starting. */
grzemich 0:d7bd7384a37c 635 netif->flags &= ~NETIF_FLAG_DHCP;
grzemich 0:d7bd7384a37c 636
grzemich 0:d7bd7384a37c 637 /* check hwtype of the netif */
grzemich 0:d7bd7384a37c 638 if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
grzemich 0:d7bd7384a37c 639 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
grzemich 0:d7bd7384a37c 640 return ERR_ARG;
grzemich 0:d7bd7384a37c 641 }
grzemich 0:d7bd7384a37c 642
grzemich 0:d7bd7384a37c 643 /* check MTU of the netif */
grzemich 0:d7bd7384a37c 644 if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
grzemich 0:d7bd7384a37c 645 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
grzemich 0:d7bd7384a37c 646 return ERR_MEM;
grzemich 0:d7bd7384a37c 647 }
grzemich 0:d7bd7384a37c 648
grzemich 0:d7bd7384a37c 649 /* no DHCP client attached yet? */
grzemich 0:d7bd7384a37c 650 if (dhcp == NULL) {
grzemich 0:d7bd7384a37c 651 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
grzemich 0:d7bd7384a37c 652 dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
grzemich 0:d7bd7384a37c 653 if (dhcp == NULL) {
grzemich 0:d7bd7384a37c 654 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
grzemich 0:d7bd7384a37c 655 return ERR_MEM;
grzemich 0:d7bd7384a37c 656 }
grzemich 0:d7bd7384a37c 657 /* store this dhcp client in the netif */
grzemich 0:d7bd7384a37c 658 netif->dhcp = dhcp;
grzemich 0:d7bd7384a37c 659 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
grzemich 0:d7bd7384a37c 660 /* already has DHCP client attached */
grzemich 0:d7bd7384a37c 661 } else {
grzemich 0:d7bd7384a37c 662 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
grzemich 0:d7bd7384a37c 663 if (dhcp->pcb != NULL) {
grzemich 0:d7bd7384a37c 664 udp_remove(dhcp->pcb);
grzemich 0:d7bd7384a37c 665 }
grzemich 0:d7bd7384a37c 666 LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
grzemich 0:d7bd7384a37c 667 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
grzemich 0:d7bd7384a37c 668 }
grzemich 0:d7bd7384a37c 669
grzemich 0:d7bd7384a37c 670 /* clear data structure */
grzemich 0:d7bd7384a37c 671 memset(dhcp, 0, sizeof(struct dhcp));
grzemich 0:d7bd7384a37c 672 /* dhcp_set_state(&dhcp, DHCP_OFF); */
grzemich 0:d7bd7384a37c 673 /* allocate UDP PCB */
grzemich 0:d7bd7384a37c 674 dhcp->pcb = udp_new();
grzemich 0:d7bd7384a37c 675 if (dhcp->pcb == NULL) {
grzemich 0:d7bd7384a37c 676 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
grzemich 0:d7bd7384a37c 677 return ERR_MEM;
grzemich 0:d7bd7384a37c 678 }
grzemich 0:d7bd7384a37c 679 dhcp->pcb->so_options |= SOF_BROADCAST;
grzemich 0:d7bd7384a37c 680 /* set up local and remote port for the pcb */
grzemich 0:d7bd7384a37c 681 udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
grzemich 0:d7bd7384a37c 682 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
grzemich 0:d7bd7384a37c 683 /* set up the recv callback and argument */
grzemich 0:d7bd7384a37c 684 udp_recv(dhcp->pcb, dhcp_recv, netif);
grzemich 0:d7bd7384a37c 685 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
grzemich 0:d7bd7384a37c 686 /* (re)start the DHCP negotiation */
grzemich 0:d7bd7384a37c 687 result = dhcp_discover(netif);
grzemich 0:d7bd7384a37c 688 if (result != ERR_OK) {
grzemich 0:d7bd7384a37c 689 /* free resources allocated above */
grzemich 0:d7bd7384a37c 690 dhcp_stop(netif);
grzemich 0:d7bd7384a37c 691 return ERR_MEM;
grzemich 0:d7bd7384a37c 692 }
grzemich 0:d7bd7384a37c 693 /* Set the flag that says this netif is handled by DHCP. */
grzemich 0:d7bd7384a37c 694 netif->flags |= NETIF_FLAG_DHCP;
grzemich 0:d7bd7384a37c 695 return result;
grzemich 0:d7bd7384a37c 696 }
grzemich 0:d7bd7384a37c 697
grzemich 0:d7bd7384a37c 698 /**
grzemich 0:d7bd7384a37c 699 * Inform a DHCP server of our manual configuration.
grzemich 0:d7bd7384a37c 700 *
grzemich 0:d7bd7384a37c 701 * This informs DHCP servers of our fixed IP address configuration
grzemich 0:d7bd7384a37c 702 * by sending an INFORM message. It does not involve DHCP address
grzemich 0:d7bd7384a37c 703 * configuration, it is just here to be nice to the network.
grzemich 0:d7bd7384a37c 704 *
grzemich 0:d7bd7384a37c 705 * @param netif The lwIP network interface
grzemich 0:d7bd7384a37c 706 */
grzemich 0:d7bd7384a37c 707 void
grzemich 0:d7bd7384a37c 708 dhcp_inform(struct netif *netif)
grzemich 0:d7bd7384a37c 709 {
grzemich 0:d7bd7384a37c 710 struct dhcp dhcp;
grzemich 0:d7bd7384a37c 711 err_t result = ERR_OK;
grzemich 0:d7bd7384a37c 712 struct udp_pcb *pcb;
grzemich 0:d7bd7384a37c 713
grzemich 0:d7bd7384a37c 714 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
grzemich 0:d7bd7384a37c 715
grzemich 0:d7bd7384a37c 716 memset(&dhcp, 0, sizeof(struct dhcp));
grzemich 0:d7bd7384a37c 717 dhcp_set_state(&dhcp, DHCP_INFORM);
grzemich 0:d7bd7384a37c 718
grzemich 0:d7bd7384a37c 719 if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
grzemich 0:d7bd7384a37c 720 /* re-use existing pcb */
grzemich 0:d7bd7384a37c 721 pcb = netif->dhcp->pcb;
grzemich 0:d7bd7384a37c 722 } else {
grzemich 0:d7bd7384a37c 723 pcb = udp_new();
grzemich 0:d7bd7384a37c 724 if (pcb == NULL) {
grzemich 0:d7bd7384a37c 725 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
grzemich 0:d7bd7384a37c 726 return;
grzemich 0:d7bd7384a37c 727 }
grzemich 0:d7bd7384a37c 728 dhcp.pcb = pcb;
grzemich 0:d7bd7384a37c 729 dhcp.pcb->so_options |= SOF_BROADCAST;
grzemich 0:d7bd7384a37c 730 udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
grzemich 0:d7bd7384a37c 731 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
grzemich 0:d7bd7384a37c 732 }
grzemich 0:d7bd7384a37c 733 /* create and initialize the DHCP message header */
grzemich 0:d7bd7384a37c 734 result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
grzemich 0:d7bd7384a37c 735 if (result == ERR_OK) {
grzemich 0:d7bd7384a37c 736 dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
grzemich 0:d7bd7384a37c 737 dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
grzemich 0:d7bd7384a37c 738
grzemich 0:d7bd7384a37c 739 dhcp_option_trailer(&dhcp);
grzemich 0:d7bd7384a37c 740
grzemich 0:d7bd7384a37c 741 pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
grzemich 0:d7bd7384a37c 742
grzemich 0:d7bd7384a37c 743 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
grzemich 0:d7bd7384a37c 744 udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
grzemich 0:d7bd7384a37c 745 dhcp_delete_msg(&dhcp);
grzemich 0:d7bd7384a37c 746 } else {
grzemich 0:d7bd7384a37c 747 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
grzemich 0:d7bd7384a37c 748 }
grzemich 0:d7bd7384a37c 749
grzemich 0:d7bd7384a37c 750 if (dhcp.pcb != NULL) {
grzemich 0:d7bd7384a37c 751 /* otherwise, the existing pcb was used */
grzemich 0:d7bd7384a37c 752 udp_remove(dhcp.pcb);
grzemich 0:d7bd7384a37c 753 }
grzemich 0:d7bd7384a37c 754 }
grzemich 0:d7bd7384a37c 755
grzemich 0:d7bd7384a37c 756 /** Handle a possible change in the network configuration.
grzemich 0:d7bd7384a37c 757 *
grzemich 0:d7bd7384a37c 758 * This enters the REBOOTING state to verify that the currently bound
grzemich 0:d7bd7384a37c 759 * address is still valid.
grzemich 0:d7bd7384a37c 760 */
grzemich 0:d7bd7384a37c 761 void
grzemich 0:d7bd7384a37c 762 dhcp_network_changed(struct netif *netif)
grzemich 0:d7bd7384a37c 763 {
grzemich 0:d7bd7384a37c 764 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 765 if (!dhcp)
grzemich 0:d7bd7384a37c 766 return;
grzemich 0:d7bd7384a37c 767 switch (dhcp->state) {
grzemich 0:d7bd7384a37c 768 case DHCP_REBINDING:
grzemich 0:d7bd7384a37c 769 case DHCP_RENEWING:
grzemich 0:d7bd7384a37c 770 case DHCP_BOUND:
grzemich 0:d7bd7384a37c 771 case DHCP_REBOOTING:
grzemich 0:d7bd7384a37c 772 netif_set_down(netif);
grzemich 0:d7bd7384a37c 773 dhcp->tries = 0;
grzemich 0:d7bd7384a37c 774 dhcp_reboot(netif);
grzemich 0:d7bd7384a37c 775 break;
grzemich 0:d7bd7384a37c 776 case DHCP_OFF:
grzemich 0:d7bd7384a37c 777 /* stay off */
grzemich 0:d7bd7384a37c 778 break;
grzemich 0:d7bd7384a37c 779 default:
grzemich 0:d7bd7384a37c 780 dhcp->tries = 0;
grzemich 0:d7bd7384a37c 781 #if LWIP_DHCP_AUTOIP_COOP
grzemich 0:d7bd7384a37c 782 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
grzemich 0:d7bd7384a37c 783 autoip_stop(netif);
grzemich 0:d7bd7384a37c 784 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
grzemich 0:d7bd7384a37c 785 }
grzemich 0:d7bd7384a37c 786 #endif /* LWIP_DHCP_AUTOIP_COOP */
grzemich 0:d7bd7384a37c 787 dhcp_discover(netif);
grzemich 0:d7bd7384a37c 788 break;
grzemich 0:d7bd7384a37c 789 }
grzemich 0:d7bd7384a37c 790 }
grzemich 0:d7bd7384a37c 791
grzemich 0:d7bd7384a37c 792 #if DHCP_DOES_ARP_CHECK
grzemich 0:d7bd7384a37c 793 /**
grzemich 0:d7bd7384a37c 794 * Match an ARP reply with the offered IP address.
grzemich 0:d7bd7384a37c 795 *
grzemich 0:d7bd7384a37c 796 * @param netif the network interface on which the reply was received
grzemich 0:d7bd7384a37c 797 * @param addr The IP address we received a reply from
grzemich 0:d7bd7384a37c 798 */
grzemich 0:d7bd7384a37c 799 void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
grzemich 0:d7bd7384a37c 800 {
grzemich 0:d7bd7384a37c 801 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
grzemich 0:d7bd7384a37c 802 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
grzemich 0:d7bd7384a37c 803 /* is a DHCP client doing an ARP check? */
grzemich 0:d7bd7384a37c 804 if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
grzemich 0:d7bd7384a37c 805 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
grzemich 0:d7bd7384a37c 806 ip4_addr_get_u32(addr)));
grzemich 0:d7bd7384a37c 807 /* did a host respond with the address we
grzemich 0:d7bd7384a37c 808 were offered by the DHCP server? */
grzemich 0:d7bd7384a37c 809 if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
grzemich 0:d7bd7384a37c 810 /* we will not accept the offered address */
grzemich 0:d7bd7384a37c 811 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
grzemich 0:d7bd7384a37c 812 ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
grzemich 0:d7bd7384a37c 813 dhcp_decline(netif);
grzemich 0:d7bd7384a37c 814 }
grzemich 0:d7bd7384a37c 815 }
grzemich 0:d7bd7384a37c 816 }
grzemich 0:d7bd7384a37c 817
grzemich 0:d7bd7384a37c 818 /**
grzemich 0:d7bd7384a37c 819 * Decline an offered lease.
grzemich 0:d7bd7384a37c 820 *
grzemich 0:d7bd7384a37c 821 * Tell the DHCP server we do not accept the offered address.
grzemich 0:d7bd7384a37c 822 * One reason to decline the lease is when we find out the address
grzemich 0:d7bd7384a37c 823 * is already in use by another host (through ARP).
grzemich 0:d7bd7384a37c 824 *
grzemich 0:d7bd7384a37c 825 * @param netif the netif under DHCP control
grzemich 0:d7bd7384a37c 826 */
grzemich 0:d7bd7384a37c 827 static err_t
grzemich 0:d7bd7384a37c 828 dhcp_decline(struct netif *netif)
grzemich 0:d7bd7384a37c 829 {
grzemich 0:d7bd7384a37c 830 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 831 err_t result = ERR_OK;
grzemich 0:d7bd7384a37c 832 u16_t msecs;
grzemich 0:d7bd7384a37c 833 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
grzemich 0:d7bd7384a37c 834 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
grzemich 0:d7bd7384a37c 835 /* create and initialize the DHCP message header */
grzemich 0:d7bd7384a37c 836 result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
grzemich 0:d7bd7384a37c 837 if (result == ERR_OK) {
grzemich 0:d7bd7384a37c 838 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
grzemich 0:d7bd7384a37c 839 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
grzemich 0:d7bd7384a37c 840
grzemich 0:d7bd7384a37c 841 dhcp_option_trailer(dhcp);
grzemich 0:d7bd7384a37c 842 /* resize pbuf to reflect true size of options */
grzemich 0:d7bd7384a37c 843 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
grzemich 0:d7bd7384a37c 844
grzemich 0:d7bd7384a37c 845 /* per section 4.4.4, broadcast DECLINE messages */
grzemich 0:d7bd7384a37c 846 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
grzemich 0:d7bd7384a37c 847 dhcp_delete_msg(dhcp);
grzemich 0:d7bd7384a37c 848 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
grzemich 0:d7bd7384a37c 849 } else {
grzemich 0:d7bd7384a37c 850 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
grzemich 0:d7bd7384a37c 851 ("dhcp_decline: could not allocate DHCP request\n"));
grzemich 0:d7bd7384a37c 852 }
grzemich 0:d7bd7384a37c 853 dhcp->tries++;
grzemich 0:d7bd7384a37c 854 msecs = 10*1000;
grzemich 0:d7bd7384a37c 855 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
grzemich 0:d7bd7384a37c 856 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
grzemich 0:d7bd7384a37c 857 return result;
grzemich 0:d7bd7384a37c 858 }
grzemich 0:d7bd7384a37c 859 #endif /* DHCP_DOES_ARP_CHECK */
grzemich 0:d7bd7384a37c 860
grzemich 0:d7bd7384a37c 861
grzemich 0:d7bd7384a37c 862 /**
grzemich 0:d7bd7384a37c 863 * Start the DHCP process, discover a DHCP server.
grzemich 0:d7bd7384a37c 864 *
grzemich 0:d7bd7384a37c 865 * @param netif the netif under DHCP control
grzemich 0:d7bd7384a37c 866 */
grzemich 0:d7bd7384a37c 867 static err_t
grzemich 0:d7bd7384a37c 868 dhcp_discover(struct netif *netif)
grzemich 0:d7bd7384a37c 869 {
grzemich 0:d7bd7384a37c 870 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 871 err_t result = ERR_OK;
grzemich 0:d7bd7384a37c 872 u16_t msecs;
grzemich 0:d7bd7384a37c 873 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
grzemich 0:d7bd7384a37c 874 ip_addr_set_any(&dhcp->offered_ip_addr);
grzemich 0:d7bd7384a37c 875 dhcp_set_state(dhcp, DHCP_SELECTING);
grzemich 0:d7bd7384a37c 876 /* create and initialize the DHCP message header */
grzemich 0:d7bd7384a37c 877 result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
grzemich 0:d7bd7384a37c 878 if (result == ERR_OK) {
grzemich 0:d7bd7384a37c 879 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
grzemich 0:d7bd7384a37c 880
grzemich 0:d7bd7384a37c 881 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
grzemich 0:d7bd7384a37c 882 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
grzemich 0:d7bd7384a37c 883
grzemich 0:d7bd7384a37c 884 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
grzemich 0:d7bd7384a37c 885 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
grzemich 0:d7bd7384a37c 886 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
grzemich 0:d7bd7384a37c 887 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
grzemich 0:d7bd7384a37c 888 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
grzemich 0:d7bd7384a37c 889
grzemich 0:d7bd7384a37c 890 dhcp_option_trailer(dhcp);
grzemich 0:d7bd7384a37c 891
grzemich 0:d7bd7384a37c 892 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
grzemich 0:d7bd7384a37c 893 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
grzemich 0:d7bd7384a37c 894
grzemich 0:d7bd7384a37c 895 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
grzemich 0:d7bd7384a37c 896 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
grzemich 0:d7bd7384a37c 897 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
grzemich 0:d7bd7384a37c 898 dhcp_delete_msg(dhcp);
grzemich 0:d7bd7384a37c 899 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
grzemich 0:d7bd7384a37c 900 } else {
grzemich 0:d7bd7384a37c 901 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
grzemich 0:d7bd7384a37c 902 }
grzemich 0:d7bd7384a37c 903 dhcp->tries++;
grzemich 0:d7bd7384a37c 904 #if LWIP_DHCP_AUTOIP_COOP
grzemich 0:d7bd7384a37c 905 if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
grzemich 0:d7bd7384a37c 906 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
grzemich 0:d7bd7384a37c 907 autoip_start(netif);
grzemich 0:d7bd7384a37c 908 }
grzemich 0:d7bd7384a37c 909 #endif /* LWIP_DHCP_AUTOIP_COOP */
grzemich 0:d7bd7384a37c 910 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
grzemich 0:d7bd7384a37c 911 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
grzemich 0:d7bd7384a37c 912 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
grzemich 0:d7bd7384a37c 913 return result;
grzemich 0:d7bd7384a37c 914 }
grzemich 0:d7bd7384a37c 915
grzemich 0:d7bd7384a37c 916
grzemich 0:d7bd7384a37c 917 /**
grzemich 0:d7bd7384a37c 918 * Bind the interface to the offered IP address.
grzemich 0:d7bd7384a37c 919 *
grzemich 0:d7bd7384a37c 920 * @param netif network interface to bind to the offered address
grzemich 0:d7bd7384a37c 921 */
grzemich 0:d7bd7384a37c 922 static void
grzemich 0:d7bd7384a37c 923 dhcp_bind(struct netif *netif)
grzemich 0:d7bd7384a37c 924 {
grzemich 0:d7bd7384a37c 925 u32_t timeout;
grzemich 0:d7bd7384a37c 926 struct dhcp *dhcp;
grzemich 0:d7bd7384a37c 927 ip_addr_t sn_mask, gw_addr;
grzemich 0:d7bd7384a37c 928 LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
grzemich 0:d7bd7384a37c 929 dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 930 LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
grzemich 0:d7bd7384a37c 931 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));
grzemich 0:d7bd7384a37c 932
grzemich 0:d7bd7384a37c 933 /* temporary DHCP lease? */
grzemich 0:d7bd7384a37c 934 if (dhcp->offered_t1_renew != 0xffffffffUL) {
grzemich 0:d7bd7384a37c 935 /* set renewal period timer */
grzemich 0:d7bd7384a37c 936 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
grzemich 0:d7bd7384a37c 937 timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
grzemich 0:d7bd7384a37c 938 if(timeout > 0xffff) {
grzemich 0:d7bd7384a37c 939 timeout = 0xffff;
grzemich 0:d7bd7384a37c 940 }
grzemich 0:d7bd7384a37c 941 dhcp->t1_timeout = (u16_t)timeout;
grzemich 0:d7bd7384a37c 942 if (dhcp->t1_timeout == 0) {
grzemich 0:d7bd7384a37c 943 dhcp->t1_timeout = 1;
grzemich 0:d7bd7384a37c 944 }
grzemich 0:d7bd7384a37c 945 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
grzemich 0:d7bd7384a37c 946 }
grzemich 0:d7bd7384a37c 947 /* set renewal period timer */
grzemich 0:d7bd7384a37c 948 if (dhcp->offered_t2_rebind != 0xffffffffUL) {
grzemich 0:d7bd7384a37c 949 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
grzemich 0:d7bd7384a37c 950 timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
grzemich 0:d7bd7384a37c 951 if(timeout > 0xffff) {
grzemich 0:d7bd7384a37c 952 timeout = 0xffff;
grzemich 0:d7bd7384a37c 953 }
grzemich 0:d7bd7384a37c 954 dhcp->t2_timeout = (u16_t)timeout;
grzemich 0:d7bd7384a37c 955 if (dhcp->t2_timeout == 0) {
grzemich 0:d7bd7384a37c 956 dhcp->t2_timeout = 1;
grzemich 0:d7bd7384a37c 957 }
grzemich 0:d7bd7384a37c 958 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
grzemich 0:d7bd7384a37c 959 }
grzemich 0:d7bd7384a37c 960
grzemich 0:d7bd7384a37c 961 if (dhcp->subnet_mask_given) {
grzemich 0:d7bd7384a37c 962 /* copy offered network mask */
grzemich 0:d7bd7384a37c 963 ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
grzemich 0:d7bd7384a37c 964 } else {
grzemich 0:d7bd7384a37c 965 /* subnet mask not given, choose a safe subnet mask given the network class */
grzemich 0:d7bd7384a37c 966 u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
grzemich 0:d7bd7384a37c 967 if (first_octet <= 127) {
grzemich 0:d7bd7384a37c 968 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000UL));
grzemich 0:d7bd7384a37c 969 } else if (first_octet >= 192) {
grzemich 0:d7bd7384a37c 970 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00UL));
grzemich 0:d7bd7384a37c 971 } else {
grzemich 0:d7bd7384a37c 972 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000UL));
grzemich 0:d7bd7384a37c 973 }
grzemich 0:d7bd7384a37c 974 }
grzemich 0:d7bd7384a37c 975
grzemich 0:d7bd7384a37c 976 ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
grzemich 0:d7bd7384a37c 977 /* gateway address not given? */
grzemich 0:d7bd7384a37c 978 if (gw_addr.addr == IPADDR_ANY) {
grzemich 0:d7bd7384a37c 979 /* copy network address */
grzemich 0:d7bd7384a37c 980 ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
grzemich 0:d7bd7384a37c 981 /* use first host address on network as gateway */
grzemich 0:d7bd7384a37c 982 ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001UL));
grzemich 0:d7bd7384a37c 983 }
grzemich 0:d7bd7384a37c 984
grzemich 0:d7bd7384a37c 985 #if LWIP_DHCP_AUTOIP_COOP
grzemich 0:d7bd7384a37c 986 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
grzemich 0:d7bd7384a37c 987 autoip_stop(netif);
grzemich 0:d7bd7384a37c 988 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
grzemich 0:d7bd7384a37c 989 }
grzemich 0:d7bd7384a37c 990 #endif /* LWIP_DHCP_AUTOIP_COOP */
grzemich 0:d7bd7384a37c 991
grzemich 0:d7bd7384a37c 992 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
grzemich 0:d7bd7384a37c 993 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
grzemich 0:d7bd7384a37c 994 netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
grzemich 0:d7bd7384a37c 995 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
grzemich 0:d7bd7384a37c 996 ip4_addr_get_u32(&sn_mask)));
grzemich 0:d7bd7384a37c 997 netif_set_netmask(netif, &sn_mask);
grzemich 0:d7bd7384a37c 998 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
grzemich 0:d7bd7384a37c 999 ip4_addr_get_u32(&gw_addr)));
grzemich 0:d7bd7384a37c 1000 netif_set_gw(netif, &gw_addr);
grzemich 0:d7bd7384a37c 1001 /* bring the interface up */
grzemich 0:d7bd7384a37c 1002 netif_set_up(netif);
grzemich 0:d7bd7384a37c 1003 /* netif is now bound to DHCP leased address */
grzemich 0:d7bd7384a37c 1004 dhcp_set_state(dhcp, DHCP_BOUND);
grzemich 0:d7bd7384a37c 1005 }
grzemich 0:d7bd7384a37c 1006
grzemich 0:d7bd7384a37c 1007 /**
grzemich 0:d7bd7384a37c 1008 * Renew an existing DHCP lease at the involved DHCP server.
grzemich 0:d7bd7384a37c 1009 *
grzemich 0:d7bd7384a37c 1010 * @param netif network interface which must renew its lease
grzemich 0:d7bd7384a37c 1011 */
grzemich 0:d7bd7384a37c 1012 err_t
grzemich 0:d7bd7384a37c 1013 dhcp_renew(struct netif *netif)
grzemich 0:d7bd7384a37c 1014 {
grzemich 0:d7bd7384a37c 1015 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 1016 err_t result;
grzemich 0:d7bd7384a37c 1017 u16_t msecs;
grzemich 0:d7bd7384a37c 1018 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
grzemich 0:d7bd7384a37c 1019 dhcp_set_state(dhcp, DHCP_RENEWING);
grzemich 0:d7bd7384a37c 1020
grzemich 0:d7bd7384a37c 1021 /* create and initialize the DHCP message header */
grzemich 0:d7bd7384a37c 1022 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
grzemich 0:d7bd7384a37c 1023 if (result == ERR_OK) {
grzemich 0:d7bd7384a37c 1024 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
grzemich 0:d7bd7384a37c 1025 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
grzemich 0:d7bd7384a37c 1026
grzemich 0:d7bd7384a37c 1027 #if LWIP_NETIF_HOSTNAME
grzemich 0:d7bd7384a37c 1028 if (netif->hostname != NULL) {
grzemich 0:d7bd7384a37c 1029 const char *p = (const char*)netif->hostname;
grzemich 0:d7bd7384a37c 1030 u8_t namelen = (u8_t)strlen(p);
grzemich 0:d7bd7384a37c 1031 if (namelen > 0) {
grzemich 0:d7bd7384a37c 1032 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
grzemich 0:d7bd7384a37c 1033 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
grzemich 0:d7bd7384a37c 1034 while (*p) {
grzemich 0:d7bd7384a37c 1035 dhcp_option_byte(dhcp, *p++);
grzemich 0:d7bd7384a37c 1036 }
grzemich 0:d7bd7384a37c 1037 }
grzemich 0:d7bd7384a37c 1038 }
grzemich 0:d7bd7384a37c 1039 #endif /* LWIP_NETIF_HOSTNAME */
grzemich 0:d7bd7384a37c 1040
grzemich 0:d7bd7384a37c 1041 #if 0
grzemich 0:d7bd7384a37c 1042 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
grzemich 0:d7bd7384a37c 1043 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
grzemich 0:d7bd7384a37c 1044 #endif
grzemich 0:d7bd7384a37c 1045
grzemich 0:d7bd7384a37c 1046 #if 0
grzemich 0:d7bd7384a37c 1047 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
grzemich 0:d7bd7384a37c 1048 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
grzemich 0:d7bd7384a37c 1049 #endif
grzemich 0:d7bd7384a37c 1050 /* append DHCP message trailer */
grzemich 0:d7bd7384a37c 1051 dhcp_option_trailer(dhcp);
grzemich 0:d7bd7384a37c 1052
grzemich 0:d7bd7384a37c 1053 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
grzemich 0:d7bd7384a37c 1054
grzemich 0:d7bd7384a37c 1055 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
grzemich 0:d7bd7384a37c 1056 dhcp_delete_msg(dhcp);
grzemich 0:d7bd7384a37c 1057
grzemich 0:d7bd7384a37c 1058 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
grzemich 0:d7bd7384a37c 1059 } else {
grzemich 0:d7bd7384a37c 1060 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
grzemich 0:d7bd7384a37c 1061 }
grzemich 0:d7bd7384a37c 1062 dhcp->tries++;
grzemich 0:d7bd7384a37c 1063 /* back-off on retries, but to a maximum of 20 seconds */
grzemich 0:d7bd7384a37c 1064 msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
grzemich 0:d7bd7384a37c 1065 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
grzemich 0:d7bd7384a37c 1066 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
grzemich 0:d7bd7384a37c 1067 return result;
grzemich 0:d7bd7384a37c 1068 }
grzemich 0:d7bd7384a37c 1069
grzemich 0:d7bd7384a37c 1070 /**
grzemich 0:d7bd7384a37c 1071 * Rebind with a DHCP server for an existing DHCP lease.
grzemich 0:d7bd7384a37c 1072 *
grzemich 0:d7bd7384a37c 1073 * @param netif network interface which must rebind with a DHCP server
grzemich 0:d7bd7384a37c 1074 */
grzemich 0:d7bd7384a37c 1075 static err_t
grzemich 0:d7bd7384a37c 1076 dhcp_rebind(struct netif *netif)
grzemich 0:d7bd7384a37c 1077 {
grzemich 0:d7bd7384a37c 1078 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 1079 err_t result;
grzemich 0:d7bd7384a37c 1080 u16_t msecs;
grzemich 0:d7bd7384a37c 1081 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
grzemich 0:d7bd7384a37c 1082 dhcp_set_state(dhcp, DHCP_REBINDING);
grzemich 0:d7bd7384a37c 1083
grzemich 0:d7bd7384a37c 1084 /* create and initialize the DHCP message header */
grzemich 0:d7bd7384a37c 1085 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
grzemich 0:d7bd7384a37c 1086 if (result == ERR_OK) {
grzemich 0:d7bd7384a37c 1087 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
grzemich 0:d7bd7384a37c 1088 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
grzemich 0:d7bd7384a37c 1089
grzemich 0:d7bd7384a37c 1090 #if LWIP_NETIF_HOSTNAME
grzemich 0:d7bd7384a37c 1091 if (netif->hostname != NULL) {
grzemich 0:d7bd7384a37c 1092 const char *p = (const char*)netif->hostname;
grzemich 0:d7bd7384a37c 1093 u8_t namelen = (u8_t)strlen(p);
grzemich 0:d7bd7384a37c 1094 if (namelen > 0) {
grzemich 0:d7bd7384a37c 1095 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
grzemich 0:d7bd7384a37c 1096 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
grzemich 0:d7bd7384a37c 1097 while (*p) {
grzemich 0:d7bd7384a37c 1098 dhcp_option_byte(dhcp, *p++);
grzemich 0:d7bd7384a37c 1099 }
grzemich 0:d7bd7384a37c 1100 }
grzemich 0:d7bd7384a37c 1101 }
grzemich 0:d7bd7384a37c 1102 #endif /* LWIP_NETIF_HOSTNAME */
grzemich 0:d7bd7384a37c 1103
grzemich 0:d7bd7384a37c 1104 #if 0
grzemich 0:d7bd7384a37c 1105 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
grzemich 0:d7bd7384a37c 1106 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
grzemich 0:d7bd7384a37c 1107
grzemich 0:d7bd7384a37c 1108 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
grzemich 0:d7bd7384a37c 1109 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
grzemich 0:d7bd7384a37c 1110 #endif
grzemich 0:d7bd7384a37c 1111
grzemich 0:d7bd7384a37c 1112 dhcp_option_trailer(dhcp);
grzemich 0:d7bd7384a37c 1113
grzemich 0:d7bd7384a37c 1114 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
grzemich 0:d7bd7384a37c 1115
grzemich 0:d7bd7384a37c 1116 /* broadcast to server */
grzemich 0:d7bd7384a37c 1117 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
grzemich 0:d7bd7384a37c 1118 dhcp_delete_msg(dhcp);
grzemich 0:d7bd7384a37c 1119 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
grzemich 0:d7bd7384a37c 1120 } else {
grzemich 0:d7bd7384a37c 1121 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
grzemich 0:d7bd7384a37c 1122 }
grzemich 0:d7bd7384a37c 1123 dhcp->tries++;
grzemich 0:d7bd7384a37c 1124 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
grzemich 0:d7bd7384a37c 1125 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
grzemich 0:d7bd7384a37c 1126 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
grzemich 0:d7bd7384a37c 1127 return result;
grzemich 0:d7bd7384a37c 1128 }
grzemich 0:d7bd7384a37c 1129
grzemich 0:d7bd7384a37c 1130 /**
grzemich 0:d7bd7384a37c 1131 * Enter REBOOTING state to verify an existing lease
grzemich 0:d7bd7384a37c 1132 *
grzemich 0:d7bd7384a37c 1133 * @param netif network interface which must reboot
grzemich 0:d7bd7384a37c 1134 */
grzemich 0:d7bd7384a37c 1135 static err_t
grzemich 0:d7bd7384a37c 1136 dhcp_reboot(struct netif *netif)
grzemich 0:d7bd7384a37c 1137 {
grzemich 0:d7bd7384a37c 1138 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 1139 err_t result;
grzemich 0:d7bd7384a37c 1140 u16_t msecs;
grzemich 0:d7bd7384a37c 1141 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
grzemich 0:d7bd7384a37c 1142 dhcp_set_state(dhcp, DHCP_REBOOTING);
grzemich 0:d7bd7384a37c 1143
grzemich 0:d7bd7384a37c 1144 /* create and initialize the DHCP message header */
grzemich 0:d7bd7384a37c 1145 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
grzemich 0:d7bd7384a37c 1146 if (result == ERR_OK) {
grzemich 0:d7bd7384a37c 1147 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
grzemich 0:d7bd7384a37c 1148 dhcp_option_short(dhcp, 576);
grzemich 0:d7bd7384a37c 1149
grzemich 0:d7bd7384a37c 1150 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
grzemich 0:d7bd7384a37c 1151 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
grzemich 0:d7bd7384a37c 1152
grzemich 0:d7bd7384a37c 1153 dhcp_option_trailer(dhcp);
grzemich 0:d7bd7384a37c 1154
grzemich 0:d7bd7384a37c 1155 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
grzemich 0:d7bd7384a37c 1156
grzemich 0:d7bd7384a37c 1157 /* broadcast to server */
grzemich 0:d7bd7384a37c 1158 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
grzemich 0:d7bd7384a37c 1159 dhcp_delete_msg(dhcp);
grzemich 0:d7bd7384a37c 1160 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
grzemich 0:d7bd7384a37c 1161 } else {
grzemich 0:d7bd7384a37c 1162 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
grzemich 0:d7bd7384a37c 1163 }
grzemich 0:d7bd7384a37c 1164 dhcp->tries++;
grzemich 0:d7bd7384a37c 1165 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
grzemich 0:d7bd7384a37c 1166 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
grzemich 0:d7bd7384a37c 1167 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
grzemich 0:d7bd7384a37c 1168 return result;
grzemich 0:d7bd7384a37c 1169 }
grzemich 0:d7bd7384a37c 1170
grzemich 0:d7bd7384a37c 1171
grzemich 0:d7bd7384a37c 1172 /**
grzemich 0:d7bd7384a37c 1173 * Release a DHCP lease.
grzemich 0:d7bd7384a37c 1174 *
grzemich 0:d7bd7384a37c 1175 * @param netif network interface which must release its lease
grzemich 0:d7bd7384a37c 1176 */
grzemich 0:d7bd7384a37c 1177 err_t
grzemich 0:d7bd7384a37c 1178 dhcp_release(struct netif *netif)
grzemich 0:d7bd7384a37c 1179 {
grzemich 0:d7bd7384a37c 1180 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 1181 err_t result;
grzemich 0:d7bd7384a37c 1182 u16_t msecs;
grzemich 0:d7bd7384a37c 1183 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
grzemich 0:d7bd7384a37c 1184
grzemich 0:d7bd7384a37c 1185 /* idle DHCP client */
grzemich 0:d7bd7384a37c 1186 dhcp_set_state(dhcp, DHCP_OFF);
grzemich 0:d7bd7384a37c 1187 /* clean old DHCP offer */
grzemich 0:d7bd7384a37c 1188 ip_addr_set_zero(&dhcp->server_ip_addr);
grzemich 0:d7bd7384a37c 1189 ip_addr_set_zero(&dhcp->offered_ip_addr);
grzemich 0:d7bd7384a37c 1190 ip_addr_set_zero(&dhcp->offered_sn_mask);
grzemich 0:d7bd7384a37c 1191 ip_addr_set_zero(&dhcp->offered_gw_addr);
grzemich 0:d7bd7384a37c 1192 #if LWIP_DHCP_BOOTP_FILE
grzemich 0:d7bd7384a37c 1193 ip_addr_set_zero(&dhcp->offered_si_addr);
grzemich 0:d7bd7384a37c 1194 #endif /* LWIP_DHCP_BOOTP_FILE */
grzemich 0:d7bd7384a37c 1195 dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
grzemich 0:d7bd7384a37c 1196
grzemich 0:d7bd7384a37c 1197 /* create and initialize the DHCP message header */
grzemich 0:d7bd7384a37c 1198 result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
grzemich 0:d7bd7384a37c 1199 if (result == ERR_OK) {
grzemich 0:d7bd7384a37c 1200 dhcp_option_trailer(dhcp);
grzemich 0:d7bd7384a37c 1201
grzemich 0:d7bd7384a37c 1202 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
grzemich 0:d7bd7384a37c 1203
grzemich 0:d7bd7384a37c 1204 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
grzemich 0:d7bd7384a37c 1205 dhcp_delete_msg(dhcp);
grzemich 0:d7bd7384a37c 1206 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
grzemich 0:d7bd7384a37c 1207 } else {
grzemich 0:d7bd7384a37c 1208 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
grzemich 0:d7bd7384a37c 1209 }
grzemich 0:d7bd7384a37c 1210 dhcp->tries++;
grzemich 0:d7bd7384a37c 1211 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
grzemich 0:d7bd7384a37c 1212 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
grzemich 0:d7bd7384a37c 1213 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
grzemich 0:d7bd7384a37c 1214 /* bring the interface down */
grzemich 0:d7bd7384a37c 1215 netif_set_down(netif);
grzemich 0:d7bd7384a37c 1216 /* remove IP address from interface */
grzemich 0:d7bd7384a37c 1217 netif_set_ipaddr(netif, IP_ADDR_ANY);
grzemich 0:d7bd7384a37c 1218 netif_set_gw(netif, IP_ADDR_ANY);
grzemich 0:d7bd7384a37c 1219 netif_set_netmask(netif, IP_ADDR_ANY);
grzemich 0:d7bd7384a37c 1220
grzemich 0:d7bd7384a37c 1221 return result;
grzemich 0:d7bd7384a37c 1222 }
grzemich 0:d7bd7384a37c 1223
grzemich 0:d7bd7384a37c 1224 /**
grzemich 0:d7bd7384a37c 1225 * Remove the DHCP client from the interface.
grzemich 0:d7bd7384a37c 1226 *
grzemich 0:d7bd7384a37c 1227 * @param netif The network interface to stop DHCP on
grzemich 0:d7bd7384a37c 1228 */
grzemich 0:d7bd7384a37c 1229 void
grzemich 0:d7bd7384a37c 1230 dhcp_stop(struct netif *netif)
grzemich 0:d7bd7384a37c 1231 {
grzemich 0:d7bd7384a37c 1232 struct dhcp *dhcp;
grzemich 0:d7bd7384a37c 1233 LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
grzemich 0:d7bd7384a37c 1234 dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 1235 /* Remove the flag that says this netif is handled by DHCP. */
grzemich 0:d7bd7384a37c 1236 netif->flags &= ~NETIF_FLAG_DHCP;
grzemich 0:d7bd7384a37c 1237
grzemich 0:d7bd7384a37c 1238 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
grzemich 0:d7bd7384a37c 1239 /* netif is DHCP configured? */
grzemich 0:d7bd7384a37c 1240 if (dhcp != NULL) {
grzemich 0:d7bd7384a37c 1241 #if LWIP_DHCP_AUTOIP_COOP
grzemich 0:d7bd7384a37c 1242 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
grzemich 0:d7bd7384a37c 1243 autoip_stop(netif);
grzemich 0:d7bd7384a37c 1244 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
grzemich 0:d7bd7384a37c 1245 }
grzemich 0:d7bd7384a37c 1246 #endif /* LWIP_DHCP_AUTOIP_COOP */
grzemich 0:d7bd7384a37c 1247
grzemich 0:d7bd7384a37c 1248 if (dhcp->pcb != NULL) {
grzemich 0:d7bd7384a37c 1249 udp_remove(dhcp->pcb);
grzemich 0:d7bd7384a37c 1250 dhcp->pcb = NULL;
grzemich 0:d7bd7384a37c 1251 }
grzemich 0:d7bd7384a37c 1252 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
grzemich 0:d7bd7384a37c 1253 dhcp_set_state(dhcp, DHCP_OFF);
grzemich 0:d7bd7384a37c 1254 }
grzemich 0:d7bd7384a37c 1255 }
grzemich 0:d7bd7384a37c 1256
grzemich 0:d7bd7384a37c 1257 /*
grzemich 0:d7bd7384a37c 1258 * Set the DHCP state of a DHCP client.
grzemich 0:d7bd7384a37c 1259 *
grzemich 0:d7bd7384a37c 1260 * If the state changed, reset the number of tries.
grzemich 0:d7bd7384a37c 1261 */
grzemich 0:d7bd7384a37c 1262 static void
grzemich 0:d7bd7384a37c 1263 dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
grzemich 0:d7bd7384a37c 1264 {
grzemich 0:d7bd7384a37c 1265 if (new_state != dhcp->state) {
grzemich 0:d7bd7384a37c 1266 dhcp->state = new_state;
grzemich 0:d7bd7384a37c 1267 dhcp->tries = 0;
grzemich 0:d7bd7384a37c 1268 dhcp->request_timeout = 0;
grzemich 0:d7bd7384a37c 1269 }
grzemich 0:d7bd7384a37c 1270 }
grzemich 0:d7bd7384a37c 1271
grzemich 0:d7bd7384a37c 1272 /*
grzemich 0:d7bd7384a37c 1273 * Concatenate an option type and length field to the outgoing
grzemich 0:d7bd7384a37c 1274 * DHCP message.
grzemich 0:d7bd7384a37c 1275 *
grzemich 0:d7bd7384a37c 1276 */
grzemich 0:d7bd7384a37c 1277 static void
grzemich 0:d7bd7384a37c 1278 dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
grzemich 0:d7bd7384a37c 1279 {
grzemich 0:d7bd7384a37c 1280 LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
grzemich 0:d7bd7384a37c 1281 dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
grzemich 0:d7bd7384a37c 1282 dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
grzemich 0:d7bd7384a37c 1283 }
grzemich 0:d7bd7384a37c 1284 /*
grzemich 0:d7bd7384a37c 1285 * Concatenate a single byte to the outgoing DHCP message.
grzemich 0:d7bd7384a37c 1286 *
grzemich 0:d7bd7384a37c 1287 */
grzemich 0:d7bd7384a37c 1288 static void
grzemich 0:d7bd7384a37c 1289 dhcp_option_byte(struct dhcp *dhcp, u8_t value)
grzemich 0:d7bd7384a37c 1290 {
grzemich 0:d7bd7384a37c 1291 LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
grzemich 0:d7bd7384a37c 1292 dhcp->msg_out->options[dhcp->options_out_len++] = value;
grzemich 0:d7bd7384a37c 1293 }
grzemich 0:d7bd7384a37c 1294
grzemich 0:d7bd7384a37c 1295 static void
grzemich 0:d7bd7384a37c 1296 dhcp_option_short(struct dhcp *dhcp, u16_t value)
grzemich 0:d7bd7384a37c 1297 {
grzemich 0:d7bd7384a37c 1298 LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
grzemich 0:d7bd7384a37c 1299 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
grzemich 0:d7bd7384a37c 1300 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
grzemich 0:d7bd7384a37c 1301 }
grzemich 0:d7bd7384a37c 1302
grzemich 0:d7bd7384a37c 1303 static void
grzemich 0:d7bd7384a37c 1304 dhcp_option_long(struct dhcp *dhcp, u32_t value)
grzemich 0:d7bd7384a37c 1305 {
grzemich 0:d7bd7384a37c 1306 LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
grzemich 0:d7bd7384a37c 1307 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
grzemich 0:d7bd7384a37c 1308 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
grzemich 0:d7bd7384a37c 1309 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
grzemich 0:d7bd7384a37c 1310 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
grzemich 0:d7bd7384a37c 1311 }
grzemich 0:d7bd7384a37c 1312
grzemich 0:d7bd7384a37c 1313 /**
grzemich 0:d7bd7384a37c 1314 * Extract the DHCP message and the DHCP options.
grzemich 0:d7bd7384a37c 1315 *
grzemich 0:d7bd7384a37c 1316 * Extract the DHCP message and the DHCP options, each into a contiguous
grzemich 0:d7bd7384a37c 1317 * piece of memory. As a DHCP message is variable sized by its options,
grzemich 0:d7bd7384a37c 1318 * and also allows overriding some fields for options, the easy approach
grzemich 0:d7bd7384a37c 1319 * is to first unfold the options into a conitguous piece of memory, and
grzemich 0:d7bd7384a37c 1320 * use that further on.
grzemich 0:d7bd7384a37c 1321 *
grzemich 0:d7bd7384a37c 1322 */
grzemich 0:d7bd7384a37c 1323 static err_t
grzemich 0:d7bd7384a37c 1324 dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
grzemich 0:d7bd7384a37c 1325 {
grzemich 0:d7bd7384a37c 1326 u8_t *options;
grzemich 0:d7bd7384a37c 1327 u16_t offset;
grzemich 0:d7bd7384a37c 1328 u16_t offset_max;
grzemich 0:d7bd7384a37c 1329 u16_t options_idx;
grzemich 0:d7bd7384a37c 1330 u16_t options_idx_max;
grzemich 0:d7bd7384a37c 1331 struct pbuf *q;
grzemich 0:d7bd7384a37c 1332 int parse_file_as_options = 0;
grzemich 0:d7bd7384a37c 1333 int parse_sname_as_options = 0;
grzemich 0:d7bd7384a37c 1334
grzemich 0:d7bd7384a37c 1335 /* clear received options */
grzemich 0:d7bd7384a37c 1336 dhcp_clear_all_options(dhcp);
grzemich 0:d7bd7384a37c 1337 /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
grzemich 0:d7bd7384a37c 1338 if (p->len < DHCP_SNAME_OFS) {
grzemich 0:d7bd7384a37c 1339 return ERR_BUF;
grzemich 0:d7bd7384a37c 1340 }
grzemich 0:d7bd7384a37c 1341 dhcp->msg_in = (struct dhcp_msg *)p->payload;
grzemich 0:d7bd7384a37c 1342 #if LWIP_DHCP_BOOTP_FILE
grzemich 0:d7bd7384a37c 1343 /* clear boot file name */
grzemich 0:d7bd7384a37c 1344 dhcp->boot_file_name[0] = 0;
grzemich 0:d7bd7384a37c 1345 #endif /* LWIP_DHCP_BOOTP_FILE */
grzemich 0:d7bd7384a37c 1346
grzemich 0:d7bd7384a37c 1347 /* parse options */
grzemich 0:d7bd7384a37c 1348
grzemich 0:d7bd7384a37c 1349 /* start with options field */
grzemich 0:d7bd7384a37c 1350 options_idx = DHCP_OPTIONS_OFS;
grzemich 0:d7bd7384a37c 1351 /* parse options to the end of the received packet */
grzemich 0:d7bd7384a37c 1352 options_idx_max = p->tot_len;
grzemich 0:d7bd7384a37c 1353 again:
grzemich 0:d7bd7384a37c 1354 q = p;
grzemich 0:d7bd7384a37c 1355 while((q != NULL) && (options_idx >= q->len)) {
grzemich 0:d7bd7384a37c 1356 options_idx -= q->len;
grzemich 0:d7bd7384a37c 1357 options_idx_max -= q->len;
grzemich 0:d7bd7384a37c 1358 q = q->next;
grzemich 0:d7bd7384a37c 1359 }
grzemich 0:d7bd7384a37c 1360 if (q == NULL) {
grzemich 0:d7bd7384a37c 1361 return ERR_BUF;
grzemich 0:d7bd7384a37c 1362 }
grzemich 0:d7bd7384a37c 1363 offset = options_idx;
grzemich 0:d7bd7384a37c 1364 offset_max = options_idx_max;
grzemich 0:d7bd7384a37c 1365 options = (u8_t*)q->payload;
grzemich 0:d7bd7384a37c 1366 /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
grzemich 0:d7bd7384a37c 1367 while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
grzemich 0:d7bd7384a37c 1368 u8_t op = options[offset];
grzemich 0:d7bd7384a37c 1369 u8_t len;
grzemich 0:d7bd7384a37c 1370 u8_t decode_len = 0;
grzemich 0:d7bd7384a37c 1371 int decode_idx = -1;
grzemich 0:d7bd7384a37c 1372 u16_t val_offset = offset + 2;
grzemich 0:d7bd7384a37c 1373 /* len byte might be in the next pbuf */
grzemich 0:d7bd7384a37c 1374 if (offset + 1 < q->len) {
grzemich 0:d7bd7384a37c 1375 len = options[offset + 1];
grzemich 0:d7bd7384a37c 1376 } else {
grzemich 0:d7bd7384a37c 1377 len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
grzemich 0:d7bd7384a37c 1378 }
grzemich 0:d7bd7384a37c 1379 /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
grzemich 0:d7bd7384a37c 1380 decode_len = len;
grzemich 0:d7bd7384a37c 1381 switch(op) {
grzemich 0:d7bd7384a37c 1382 /* case(DHCP_OPTION_END): handled above */
grzemich 0:d7bd7384a37c 1383 case(DHCP_OPTION_PAD):
grzemich 0:d7bd7384a37c 1384 /* special option: no len encoded */
grzemich 0:d7bd7384a37c 1385 decode_len = len = 0;
grzemich 0:d7bd7384a37c 1386 /* will be increased below */
grzemich 0:d7bd7384a37c 1387 offset--;
grzemich 0:d7bd7384a37c 1388 break;
grzemich 0:d7bd7384a37c 1389 case(DHCP_OPTION_SUBNET_MASK):
grzemich 0:d7bd7384a37c 1390 LWIP_ASSERT("len == 4", len == 4);
grzemich 0:d7bd7384a37c 1391 decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
grzemich 0:d7bd7384a37c 1392 break;
grzemich 0:d7bd7384a37c 1393 case(DHCP_OPTION_ROUTER):
grzemich 0:d7bd7384a37c 1394 decode_len = 4; /* only copy the first given router */
grzemich 0:d7bd7384a37c 1395 LWIP_ASSERT("len >= decode_len", len >= decode_len);
grzemich 0:d7bd7384a37c 1396 decode_idx = DHCP_OPTION_IDX_ROUTER;
grzemich 0:d7bd7384a37c 1397 break;
grzemich 0:d7bd7384a37c 1398 case(DHCP_OPTION_DNS_SERVER):
grzemich 0:d7bd7384a37c 1399 /* special case: there might be more than one server */
grzemich 0:d7bd7384a37c 1400 LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
grzemich 0:d7bd7384a37c 1401 /* limit number of DNS servers */
grzemich 0:d7bd7384a37c 1402 decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
grzemich 0:d7bd7384a37c 1403 LWIP_ASSERT("len >= decode_len", len >= decode_len);
grzemich 0:d7bd7384a37c 1404 decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
grzemich 0:d7bd7384a37c 1405 break;
grzemich 0:d7bd7384a37c 1406 case(DHCP_OPTION_LEASE_TIME):
grzemich 0:d7bd7384a37c 1407 LWIP_ASSERT("len == 4", len == 4);
grzemich 0:d7bd7384a37c 1408 decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
grzemich 0:d7bd7384a37c 1409 break;
grzemich 0:d7bd7384a37c 1410 case(DHCP_OPTION_OVERLOAD):
grzemich 0:d7bd7384a37c 1411 LWIP_ASSERT("len == 1", len == 1);
grzemich 0:d7bd7384a37c 1412 decode_idx = DHCP_OPTION_IDX_OVERLOAD;
grzemich 0:d7bd7384a37c 1413 break;
grzemich 0:d7bd7384a37c 1414 case(DHCP_OPTION_MESSAGE_TYPE):
grzemich 0:d7bd7384a37c 1415 LWIP_ASSERT("len == 1", len == 1);
grzemich 0:d7bd7384a37c 1416 decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
grzemich 0:d7bd7384a37c 1417 break;
grzemich 0:d7bd7384a37c 1418 case(DHCP_OPTION_SERVER_ID):
grzemich 0:d7bd7384a37c 1419 LWIP_ASSERT("len == 4", len == 4);
grzemich 0:d7bd7384a37c 1420 decode_idx = DHCP_OPTION_IDX_SERVER_ID;
grzemich 0:d7bd7384a37c 1421 break;
grzemich 0:d7bd7384a37c 1422 case(DHCP_OPTION_T1):
grzemich 0:d7bd7384a37c 1423 LWIP_ASSERT("len == 4", len == 4);
grzemich 0:d7bd7384a37c 1424 decode_idx = DHCP_OPTION_IDX_T1;
grzemich 0:d7bd7384a37c 1425 break;
grzemich 0:d7bd7384a37c 1426 case(DHCP_OPTION_T2):
grzemich 0:d7bd7384a37c 1427 LWIP_ASSERT("len == 4", len == 4);
grzemich 0:d7bd7384a37c 1428 decode_idx = DHCP_OPTION_IDX_T2;
grzemich 0:d7bd7384a37c 1429 break;
grzemich 0:d7bd7384a37c 1430 default:
grzemich 0:d7bd7384a37c 1431 decode_len = 0;
grzemich 0:d7bd7384a37c 1432 LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
grzemich 0:d7bd7384a37c 1433 break;
grzemich 0:d7bd7384a37c 1434 }
grzemich 0:d7bd7384a37c 1435 offset += len + 2;
grzemich 0:d7bd7384a37c 1436 if (decode_len > 0) {
grzemich 0:d7bd7384a37c 1437 u32_t value = 0;
grzemich 0:d7bd7384a37c 1438 u16_t copy_len;
grzemich 0:d7bd7384a37c 1439 decode_next:
grzemich 0:d7bd7384a37c 1440 LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
grzemich 0:d7bd7384a37c 1441 LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
grzemich 0:d7bd7384a37c 1442 copy_len = LWIP_MIN(decode_len, 4);
grzemich 0:d7bd7384a37c 1443 pbuf_copy_partial(q, &value, copy_len, val_offset);
grzemich 0:d7bd7384a37c 1444 if (decode_len > 4) {
grzemich 0:d7bd7384a37c 1445 /* decode more than one u32_t */
grzemich 0:d7bd7384a37c 1446 LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
grzemich 0:d7bd7384a37c 1447 dhcp_got_option(dhcp, decode_idx);
grzemich 0:d7bd7384a37c 1448 dhcp_set_option_value(dhcp, decode_idx, htonl(value));
grzemich 0:d7bd7384a37c 1449 decode_len -= 4;
grzemich 0:d7bd7384a37c 1450 val_offset += 4;
grzemich 0:d7bd7384a37c 1451 decode_idx++;
grzemich 0:d7bd7384a37c 1452 goto decode_next;
grzemich 0:d7bd7384a37c 1453 } else if (decode_len == 4) {
grzemich 0:d7bd7384a37c 1454 value = ntohl(value);
grzemich 0:d7bd7384a37c 1455 } else {
grzemich 0:d7bd7384a37c 1456 LWIP_ASSERT("invalid decode_len", decode_len == 1);
grzemich 0:d7bd7384a37c 1457 value = ((u8_t*)&value)[0];
grzemich 0:d7bd7384a37c 1458 }
grzemich 0:d7bd7384a37c 1459 dhcp_got_option(dhcp, decode_idx);
grzemich 0:d7bd7384a37c 1460 dhcp_set_option_value(dhcp, decode_idx, value);
grzemich 0:d7bd7384a37c 1461 }
grzemich 0:d7bd7384a37c 1462 if (offset >= q->len) {
grzemich 0:d7bd7384a37c 1463 offset -= q->len;
grzemich 0:d7bd7384a37c 1464 offset_max -= q->len;
grzemich 0:d7bd7384a37c 1465 q = q->next;
grzemich 0:d7bd7384a37c 1466 options = (u8_t*)q->payload;
grzemich 0:d7bd7384a37c 1467 }
grzemich 0:d7bd7384a37c 1468 }
grzemich 0:d7bd7384a37c 1469 /* is this an overloaded message? */
grzemich 0:d7bd7384a37c 1470 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
grzemich 0:d7bd7384a37c 1471 u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
grzemich 0:d7bd7384a37c 1472 dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
grzemich 0:d7bd7384a37c 1473 if (overload == DHCP_OVERLOAD_FILE) {
grzemich 0:d7bd7384a37c 1474 parse_file_as_options = 1;
grzemich 0:d7bd7384a37c 1475 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
grzemich 0:d7bd7384a37c 1476 } else if (overload == DHCP_OVERLOAD_SNAME) {
grzemich 0:d7bd7384a37c 1477 parse_sname_as_options = 1;
grzemich 0:d7bd7384a37c 1478 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
grzemich 0:d7bd7384a37c 1479 } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
grzemich 0:d7bd7384a37c 1480 parse_sname_as_options = 1;
grzemich 0:d7bd7384a37c 1481 parse_file_as_options = 1;
grzemich 0:d7bd7384a37c 1482 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
grzemich 0:d7bd7384a37c 1483 } else {
grzemich 0:d7bd7384a37c 1484 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
grzemich 0:d7bd7384a37c 1485 }
grzemich 0:d7bd7384a37c 1486 #if LWIP_DHCP_BOOTP_FILE
grzemich 0:d7bd7384a37c 1487 if (!parse_file_as_options) {
grzemich 0:d7bd7384a37c 1488 /* only do this for ACK messages */
grzemich 0:d7bd7384a37c 1489 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
grzemich 0:d7bd7384a37c 1490 (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
grzemich 0:d7bd7384a37c 1491 /* copy bootp file name, don't care for sname (server hostname) */
grzemich 0:d7bd7384a37c 1492 pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
grzemich 0:d7bd7384a37c 1493 /* make sure the string is really NULL-terminated */
grzemich 0:d7bd7384a37c 1494 dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
grzemich 0:d7bd7384a37c 1495 }
grzemich 0:d7bd7384a37c 1496 #endif /* LWIP_DHCP_BOOTP_FILE */
grzemich 0:d7bd7384a37c 1497 }
grzemich 0:d7bd7384a37c 1498 if (parse_file_as_options) {
grzemich 0:d7bd7384a37c 1499 /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
grzemich 0:d7bd7384a37c 1500 parse_file_as_options = 0;
grzemich 0:d7bd7384a37c 1501 options_idx = DHCP_FILE_OFS;
grzemich 0:d7bd7384a37c 1502 options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
grzemich 0:d7bd7384a37c 1503 goto again;
grzemich 0:d7bd7384a37c 1504 } else if (parse_sname_as_options) {
grzemich 0:d7bd7384a37c 1505 parse_sname_as_options = 0;
grzemich 0:d7bd7384a37c 1506 options_idx = DHCP_SNAME_OFS;
grzemich 0:d7bd7384a37c 1507 options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
grzemich 0:d7bd7384a37c 1508 goto again;
grzemich 0:d7bd7384a37c 1509 }
grzemich 0:d7bd7384a37c 1510 return ERR_OK;
grzemich 0:d7bd7384a37c 1511 }
grzemich 0:d7bd7384a37c 1512
grzemich 0:d7bd7384a37c 1513 /**
grzemich 0:d7bd7384a37c 1514 * If an incoming DHCP message is in response to us, then trigger the state machine
grzemich 0:d7bd7384a37c 1515 */
grzemich 0:d7bd7384a37c 1516 static void
grzemich 0:d7bd7384a37c 1517 dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
grzemich 0:d7bd7384a37c 1518 {
grzemich 0:d7bd7384a37c 1519 struct netif *netif = (struct netif *)arg;
grzemich 0:d7bd7384a37c 1520 struct dhcp *dhcp = netif->dhcp;
grzemich 0:d7bd7384a37c 1521 struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
grzemich 0:d7bd7384a37c 1522 u8_t msg_type;
grzemich 0:d7bd7384a37c 1523 u8_t i;
grzemich 0:d7bd7384a37c 1524 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,
grzemich 0:d7bd7384a37c 1525 ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
grzemich 0:d7bd7384a37c 1526 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
grzemich 0:d7bd7384a37c 1527 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
grzemich 0:d7bd7384a37c 1528 /* prevent warnings about unused arguments */
grzemich 0:d7bd7384a37c 1529 LWIP_UNUSED_ARG(pcb);
grzemich 0:d7bd7384a37c 1530 LWIP_UNUSED_ARG(addr);
grzemich 0:d7bd7384a37c 1531 LWIP_UNUSED_ARG(port);
grzemich 0:d7bd7384a37c 1532
grzemich 0:d7bd7384a37c 1533 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
grzemich 0:d7bd7384a37c 1534
grzemich 0:d7bd7384a37c 1535 if (p->len < DHCP_MIN_REPLY_LEN) {
grzemich 0:d7bd7384a37c 1536 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
grzemich 0:d7bd7384a37c 1537 goto free_pbuf_and_return;
grzemich 0:d7bd7384a37c 1538 }
grzemich 0:d7bd7384a37c 1539
grzemich 0:d7bd7384a37c 1540 if (reply_msg->op != DHCP_BOOTREPLY) {
grzemich 0:d7bd7384a37c 1541 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));
grzemich 0:d7bd7384a37c 1542 goto free_pbuf_and_return;
grzemich 0:d7bd7384a37c 1543 }
grzemich 0:d7bd7384a37c 1544 /* iterate through hardware address and match against DHCP message */
grzemich 0:d7bd7384a37c 1545 for (i = 0; i < netif->hwaddr_len; i++) {
grzemich 0:d7bd7384a37c 1546 if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
grzemich 0:d7bd7384a37c 1547 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
grzemich 0:d7bd7384a37c 1548 ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
grzemich 0:d7bd7384a37c 1549 (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
grzemich 0:d7bd7384a37c 1550 goto free_pbuf_and_return;
grzemich 0:d7bd7384a37c 1551 }
grzemich 0:d7bd7384a37c 1552 }
grzemich 0:d7bd7384a37c 1553 /* match transaction ID against what we expected */
grzemich 0:d7bd7384a37c 1554 if (ntohl(reply_msg->xid) != dhcp->xid) {
grzemich 0:d7bd7384a37c 1555 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
grzemich 0:d7bd7384a37c 1556 ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
grzemich 0:d7bd7384a37c 1557 goto free_pbuf_and_return;
grzemich 0:d7bd7384a37c 1558 }
grzemich 0:d7bd7384a37c 1559 /* option fields could be unfold? */
grzemich 0:d7bd7384a37c 1560 if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
grzemich 0:d7bd7384a37c 1561 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
grzemich 0:d7bd7384a37c 1562 ("problem unfolding DHCP message - too short on memory?\n"));
grzemich 0:d7bd7384a37c 1563 goto free_pbuf_and_return;
grzemich 0:d7bd7384a37c 1564 }
grzemich 0:d7bd7384a37c 1565
grzemich 0:d7bd7384a37c 1566 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
grzemich 0:d7bd7384a37c 1567 /* obtain pointer to DHCP message type */
grzemich 0:d7bd7384a37c 1568 if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
grzemich 0:d7bd7384a37c 1569 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
grzemich 0:d7bd7384a37c 1570 goto free_pbuf_and_return;
grzemich 0:d7bd7384a37c 1571 }
grzemich 0:d7bd7384a37c 1572
grzemich 0:d7bd7384a37c 1573 /* read DHCP message type */
grzemich 0:d7bd7384a37c 1574 msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
grzemich 0:d7bd7384a37c 1575 /* message type is DHCP ACK? */
grzemich 0:d7bd7384a37c 1576 if (msg_type == DHCP_ACK) {
grzemich 0:d7bd7384a37c 1577 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
grzemich 0:d7bd7384a37c 1578 /* in requesting state? */
grzemich 0:d7bd7384a37c 1579 if (dhcp->state == DHCP_REQUESTING) {
grzemich 0:d7bd7384a37c 1580 dhcp_handle_ack(netif);
grzemich 0:d7bd7384a37c 1581 #if DHCP_DOES_ARP_CHECK
grzemich 0:d7bd7384a37c 1582 /* check if the acknowledged lease address is already in use */
grzemich 0:d7bd7384a37c 1583 dhcp_check(netif);
grzemich 0:d7bd7384a37c 1584 #else
grzemich 0:d7bd7384a37c 1585 /* bind interface to the acknowledged lease address */
grzemich 0:d7bd7384a37c 1586 dhcp_bind(netif);
grzemich 0:d7bd7384a37c 1587 #endif
grzemich 0:d7bd7384a37c 1588 }
grzemich 0:d7bd7384a37c 1589 /* already bound to the given lease address? */
grzemich 0:d7bd7384a37c 1590 else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
grzemich 0:d7bd7384a37c 1591 dhcp_bind(netif);
grzemich 0:d7bd7384a37c 1592 }
grzemich 0:d7bd7384a37c 1593 }
grzemich 0:d7bd7384a37c 1594 /* received a DHCP_NAK in appropriate state? */
grzemich 0:d7bd7384a37c 1595 else if ((msg_type == DHCP_NAK) &&
grzemich 0:d7bd7384a37c 1596 ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
grzemich 0:d7bd7384a37c 1597 (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
grzemich 0:d7bd7384a37c 1598 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
grzemich 0:d7bd7384a37c 1599 dhcp_handle_nak(netif);
grzemich 0:d7bd7384a37c 1600 }
grzemich 0:d7bd7384a37c 1601 /* received a DHCP_OFFER in DHCP_SELECTING state? */
grzemich 0:d7bd7384a37c 1602 else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
grzemich 0:d7bd7384a37c 1603 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
grzemich 0:d7bd7384a37c 1604 dhcp->request_timeout = 0;
grzemich 0:d7bd7384a37c 1605 /* remember offered lease */
grzemich 0:d7bd7384a37c 1606 dhcp_handle_offer(netif);
grzemich 0:d7bd7384a37c 1607 }
grzemich 0:d7bd7384a37c 1608 free_pbuf_and_return:
grzemich 0:d7bd7384a37c 1609 dhcp->msg_in = NULL;
grzemich 0:d7bd7384a37c 1610 pbuf_free(p);
grzemich 0:d7bd7384a37c 1611 }
grzemich 0:d7bd7384a37c 1612
grzemich 0:d7bd7384a37c 1613 /**
grzemich 0:d7bd7384a37c 1614 * Create a DHCP request, fill in common headers
grzemich 0:d7bd7384a37c 1615 *
grzemich 0:d7bd7384a37c 1616 * @param netif the netif under DHCP control
grzemich 0:d7bd7384a37c 1617 * @param dhcp dhcp control struct
grzemich 0:d7bd7384a37c 1618 * @param message_type message type of the request
grzemich 0:d7bd7384a37c 1619 */
grzemich 0:d7bd7384a37c 1620 static err_t
grzemich 0:d7bd7384a37c 1621 dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
grzemich 0:d7bd7384a37c 1622 {
grzemich 0:d7bd7384a37c 1623 u16_t i;
grzemich 0:d7bd7384a37c 1624 #ifndef DHCP_GLOBAL_XID
grzemich 0:d7bd7384a37c 1625 /** default global transaction identifier starting value (easy to match
grzemich 0:d7bd7384a37c 1626 * with a packet analyser). We simply increment for each new request.
grzemich 0:d7bd7384a37c 1627 * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
grzemich 0:d7bd7384a37c 1628 * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
grzemich 0:d7bd7384a37c 1629 static u32_t xid = 0xABCD0000;
grzemich 0:d7bd7384a37c 1630 #else
grzemich 0:d7bd7384a37c 1631 static u32_t xid;
grzemich 0:d7bd7384a37c 1632 static u8_t xid_initialised = 0;
grzemich 0:d7bd7384a37c 1633 if (!xid_initialised) {
grzemich 0:d7bd7384a37c 1634 xid = DHCP_GLOBAL_XID;
grzemich 0:d7bd7384a37c 1635 xid_initialised = !xid_initialised;
grzemich 0:d7bd7384a37c 1636 }
grzemich 0:d7bd7384a37c 1637 #endif
grzemich 0:d7bd7384a37c 1638 LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
grzemich 0:d7bd7384a37c 1639 LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
grzemich 0:d7bd7384a37c 1640 LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
grzemich 0:d7bd7384a37c 1641 LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
grzemich 0:d7bd7384a37c 1642 dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
grzemich 0:d7bd7384a37c 1643 if (dhcp->p_out == NULL) {
grzemich 0:d7bd7384a37c 1644 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
grzemich 0:d7bd7384a37c 1645 ("dhcp_create_msg(): could not allocate pbuf\n"));
grzemich 0:d7bd7384a37c 1646 return ERR_MEM;
grzemich 0:d7bd7384a37c 1647 }
grzemich 0:d7bd7384a37c 1648 LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
grzemich 0:d7bd7384a37c 1649 (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
grzemich 0:d7bd7384a37c 1650
grzemich 0:d7bd7384a37c 1651 /* reuse transaction identifier in retransmissions */
grzemich 0:d7bd7384a37c 1652 if (dhcp->tries == 0) {
grzemich 0:d7bd7384a37c 1653 xid++;
grzemich 0:d7bd7384a37c 1654 }
grzemich 0:d7bd7384a37c 1655 dhcp->xid = xid;
grzemich 0:d7bd7384a37c 1656 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
grzemich 0:d7bd7384a37c 1657 ("transaction id xid(%"X32_F")\n", xid));
grzemich 0:d7bd7384a37c 1658
grzemich 0:d7bd7384a37c 1659 dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
grzemich 0:d7bd7384a37c 1660
grzemich 0:d7bd7384a37c 1661 dhcp->msg_out->op = DHCP_BOOTREQUEST;
grzemich 0:d7bd7384a37c 1662 /* TODO: make link layer independent */
grzemich 0:d7bd7384a37c 1663 dhcp->msg_out->htype = DHCP_HTYPE_ETH;
grzemich 0:d7bd7384a37c 1664 dhcp->msg_out->hlen = netif->hwaddr_len;
grzemich 0:d7bd7384a37c 1665 dhcp->msg_out->hops = 0;
grzemich 0:d7bd7384a37c 1666 dhcp->msg_out->xid = htonl(dhcp->xid);
grzemich 0:d7bd7384a37c 1667 dhcp->msg_out->secs = 0;
grzemich 0:d7bd7384a37c 1668 /* we don't need the broadcast flag since we can receive unicast traffic
grzemich 0:d7bd7384a37c 1669 before being fully configured! */
grzemich 0:d7bd7384a37c 1670 dhcp->msg_out->flags = 0;
grzemich 0:d7bd7384a37c 1671 ip_addr_set_zero(&dhcp->msg_out->ciaddr);
grzemich 0:d7bd7384a37c 1672 /* set ciaddr to netif->ip_addr based on message_type and state */
grzemich 0:d7bd7384a37c 1673 if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
grzemich 0:d7bd7384a37c 1674 ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
grzemich 0:d7bd7384a37c 1675 ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
grzemich 0:d7bd7384a37c 1676 ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
grzemich 0:d7bd7384a37c 1677 }
grzemich 0:d7bd7384a37c 1678 ip_addr_set_zero(&dhcp->msg_out->yiaddr);
grzemich 0:d7bd7384a37c 1679 ip_addr_set_zero(&dhcp->msg_out->siaddr);
grzemich 0:d7bd7384a37c 1680 ip_addr_set_zero(&dhcp->msg_out->giaddr);
grzemich 0:d7bd7384a37c 1681 for (i = 0; i < netif->hwaddr_len; i++) {
grzemich 0:d7bd7384a37c 1682 /* copy netif hardware address */
grzemich 0:d7bd7384a37c 1683 dhcp->msg_out->chaddr[i] = netif->hwaddr[i];
grzemich 0:d7bd7384a37c 1684 }
grzemich 0:d7bd7384a37c 1685 for ( ; i < DHCP_CHADDR_LEN; i++) {
grzemich 0:d7bd7384a37c 1686 /* ... pad rest with zeroes */
grzemich 0:d7bd7384a37c 1687 dhcp->msg_out->chaddr[i] = 0;
grzemich 0:d7bd7384a37c 1688 }
grzemich 0:d7bd7384a37c 1689 for (i = 0; i < DHCP_SNAME_LEN; i++) {
grzemich 0:d7bd7384a37c 1690 dhcp->msg_out->sname[i] = 0;
grzemich 0:d7bd7384a37c 1691 }
grzemich 0:d7bd7384a37c 1692 for (i = 0; i < DHCP_FILE_LEN; i++) {
grzemich 0:d7bd7384a37c 1693 dhcp->msg_out->file[i] = 0;
grzemich 0:d7bd7384a37c 1694 }
grzemich 0:d7bd7384a37c 1695 dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
grzemich 0:d7bd7384a37c 1696 dhcp->options_out_len = 0;
grzemich 0:d7bd7384a37c 1697 /* fill options field with an incrementing array (for debugging purposes) */
grzemich 0:d7bd7384a37c 1698 for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
grzemich 0:d7bd7384a37c 1699 dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
grzemich 0:d7bd7384a37c 1700 }
grzemich 0:d7bd7384a37c 1701 /* Add option MESSAGE_TYPE */
grzemich 0:d7bd7384a37c 1702 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
grzemich 0:d7bd7384a37c 1703 dhcp_option_byte(dhcp, message_type);
grzemich 0:d7bd7384a37c 1704 return ERR_OK;
grzemich 0:d7bd7384a37c 1705 }
grzemich 0:d7bd7384a37c 1706
grzemich 0:d7bd7384a37c 1707 /**
grzemich 0:d7bd7384a37c 1708 * Free previously allocated memory used to send a DHCP request.
grzemich 0:d7bd7384a37c 1709 *
grzemich 0:d7bd7384a37c 1710 * @param dhcp the dhcp struct to free the request from
grzemich 0:d7bd7384a37c 1711 */
grzemich 0:d7bd7384a37c 1712 static void
grzemich 0:d7bd7384a37c 1713 dhcp_delete_msg(struct dhcp *dhcp)
grzemich 0:d7bd7384a37c 1714 {
grzemich 0:d7bd7384a37c 1715 LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
grzemich 0:d7bd7384a37c 1716 LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
grzemich 0:d7bd7384a37c 1717 LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
grzemich 0:d7bd7384a37c 1718 if (dhcp->p_out != NULL) {
grzemich 0:d7bd7384a37c 1719 pbuf_free(dhcp->p_out);
grzemich 0:d7bd7384a37c 1720 }
grzemich 0:d7bd7384a37c 1721 dhcp->p_out = NULL;
grzemich 0:d7bd7384a37c 1722 dhcp->msg_out = NULL;
grzemich 0:d7bd7384a37c 1723 }
grzemich 0:d7bd7384a37c 1724
grzemich 0:d7bd7384a37c 1725 /**
grzemich 0:d7bd7384a37c 1726 * Add a DHCP message trailer
grzemich 0:d7bd7384a37c 1727 *
grzemich 0:d7bd7384a37c 1728 * Adds the END option to the DHCP message, and if
grzemich 0:d7bd7384a37c 1729 * necessary, up to three padding bytes.
grzemich 0:d7bd7384a37c 1730 *
grzemich 0:d7bd7384a37c 1731 * @param dhcp DHCP state structure
grzemich 0:d7bd7384a37c 1732 */
grzemich 0:d7bd7384a37c 1733 static void
grzemich 0:d7bd7384a37c 1734 dhcp_option_trailer(struct dhcp *dhcp)
grzemich 0:d7bd7384a37c 1735 {
grzemich 0:d7bd7384a37c 1736 LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
grzemich 0:d7bd7384a37c 1737 LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
grzemich 0:d7bd7384a37c 1738 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
grzemich 0:d7bd7384a37c 1739 dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
grzemich 0:d7bd7384a37c 1740 /* packet is too small, or not 4 byte aligned? */
grzemich 0:d7bd7384a37c 1741 while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
grzemich 0:d7bd7384a37c 1742 /* 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)); */
grzemich 0:d7bd7384a37c 1743 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
grzemich 0:d7bd7384a37c 1744 /* add a fill/padding byte */
grzemich 0:d7bd7384a37c 1745 dhcp->msg_out->options[dhcp->options_out_len++] = 0;
grzemich 0:d7bd7384a37c 1746 }
grzemich 0:d7bd7384a37c 1747 }
grzemich 0:d7bd7384a37c 1748
grzemich 0:d7bd7384a37c 1749 #endif /* LWIP_DHCP */