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Dependencies:   mbed

NetServices/lwip/core/dhcp.c@1:f5ac63519541, 2014-03-05 (annotated)

Committer:
Michael J. Spencer
Date:
Wed Mar 05 06:14:02 2014 -0800
Revision:
1:f5ac63519541
Initial commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Michael J. Spencer 1:f5ac63519541 1 /**
Michael J. Spencer 1:f5ac63519541 2 * @file
Michael J. Spencer 1:f5ac63519541 3 * Dynamic Host Configuration Protocol client
Michael J. Spencer 1:f5ac63519541 4 *
Michael J. Spencer 1:f5ac63519541 5 */
Michael J. Spencer 1:f5ac63519541 6
Michael J. Spencer 1:f5ac63519541 7 /*
Michael J. Spencer 1:f5ac63519541 8 *
Michael J. Spencer 1:f5ac63519541 9 * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
Michael J. Spencer 1:f5ac63519541 10 * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
Michael J. Spencer 1:f5ac63519541 11 * All rights reserved.
Michael J. Spencer 1:f5ac63519541 12 *
Michael J. Spencer 1:f5ac63519541 13 * Redistribution and use in source and binary forms, with or without modification,
Michael J. Spencer 1:f5ac63519541 14 * are permitted provided that the following conditions are met:
Michael J. Spencer 1:f5ac63519541 15 *
Michael J. Spencer 1:f5ac63519541 16 * 1. Redistributions of source code must retain the above copyright notice,
Michael J. Spencer 1:f5ac63519541 17 * this list of conditions and the following disclaimer.
Michael J. Spencer 1:f5ac63519541 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
Michael J. Spencer 1:f5ac63519541 19 * this list of conditions and the following disclaimer in the documentation
Michael J. Spencer 1:f5ac63519541 20 * and/or other materials provided with the distribution.
Michael J. Spencer 1:f5ac63519541 21 * 3. The name of the author may not be used to endorse or promote products
Michael J. Spencer 1:f5ac63519541 22 * derived from this software without specific prior written permission.
Michael J. Spencer 1:f5ac63519541 23 *
Michael J. Spencer 1:f5ac63519541 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
Michael J. Spencer 1:f5ac63519541 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
Michael J. Spencer 1:f5ac63519541 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
Michael J. Spencer 1:f5ac63519541 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
Michael J. Spencer 1:f5ac63519541 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
Michael J. Spencer 1:f5ac63519541 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Michael J. Spencer 1:f5ac63519541 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Michael J. Spencer 1:f5ac63519541 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
Michael J. Spencer 1:f5ac63519541 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
Michael J. Spencer 1:f5ac63519541 33 * OF SUCH DAMAGE.
Michael J. Spencer 1:f5ac63519541 34 *
Michael J. Spencer 1:f5ac63519541 35 * This file is a contribution to the lwIP TCP/IP stack.
Michael J. Spencer 1:f5ac63519541 36 * The Swedish Institute of Computer Science and Adam Dunkels
Michael J. Spencer 1:f5ac63519541 37 * are specifically granted permission to redistribute this
Michael J. Spencer 1:f5ac63519541 38 * source code.
Michael J. Spencer 1:f5ac63519541 39 *
Michael J. Spencer 1:f5ac63519541 40 * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
Michael J. Spencer 1:f5ac63519541 41 *
Michael J. Spencer 1:f5ac63519541 42 * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
Michael J. Spencer 1:f5ac63519541 43 * with RFC 2131 and RFC 2132.
Michael J. Spencer 1:f5ac63519541 44 *
Michael J. Spencer 1:f5ac63519541 45 * TODO:
Michael J. Spencer 1:f5ac63519541 46 * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
Michael J. Spencer 1:f5ac63519541 47 *
Michael J. Spencer 1:f5ac63519541 48 * Please coordinate changes and requests with Leon Woestenberg
Michael J. Spencer 1:f5ac63519541 49 * <leon.woestenberg@gmx.net>
Michael J. Spencer 1:f5ac63519541 50 *
Michael J. Spencer 1:f5ac63519541 51 * Integration with your code:
Michael J. Spencer 1:f5ac63519541 52 *
Michael J. Spencer 1:f5ac63519541 53 * In lwip/dhcp.h
Michael J. Spencer 1:f5ac63519541 54 * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
Michael J. Spencer 1:f5ac63519541 55 * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
Michael J. Spencer 1:f5ac63519541 56 *
Michael J. Spencer 1:f5ac63519541 57 * Then have your application call dhcp_coarse_tmr() and
Michael J. Spencer 1:f5ac63519541 58 * dhcp_fine_tmr() on the defined intervals.
Michael J. Spencer 1:f5ac63519541 59 *
Michael J. Spencer 1:f5ac63519541 60 * dhcp_start(struct netif *netif);
Michael J. Spencer 1:f5ac63519541 61 * starts a DHCP client instance which configures the interface by
Michael J. Spencer 1:f5ac63519541 62 * obtaining an IP address lease and maintaining it.
Michael J. Spencer 1:f5ac63519541 63 *
Michael J. Spencer 1:f5ac63519541 64 * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
Michael J. Spencer 1:f5ac63519541 65 * to remove the DHCP client.
Michael J. Spencer 1:f5ac63519541 66 *
Michael J. Spencer 1:f5ac63519541 67 */
Michael J. Spencer 1:f5ac63519541 68
Michael J. Spencer 1:f5ac63519541 69 #include "lwip/opt.h"
Michael J. Spencer 1:f5ac63519541 70
Michael J. Spencer 1:f5ac63519541 71 #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
Michael J. Spencer 1:f5ac63519541 72
Michael J. Spencer 1:f5ac63519541 73 #include "lwip/stats.h"
Michael J. Spencer 1:f5ac63519541 74 #include "lwip/mem.h"
Michael J. Spencer 1:f5ac63519541 75 #include "lwip/udp.h"
Michael J. Spencer 1:f5ac63519541 76 #include "lwip/ip_addr.h"
Michael J. Spencer 1:f5ac63519541 77 #include "lwip/netif.h"
Michael J. Spencer 1:f5ac63519541 78 #include "lwip/def.h"
Michael J. Spencer 1:f5ac63519541 79 #include "lwip/sys.h"
Michael J. Spencer 1:f5ac63519541 80 #include "lwip/dhcp.h"
Michael J. Spencer 1:f5ac63519541 81 #include "lwip/autoip.h"
Michael J. Spencer 1:f5ac63519541 82 #include "lwip/dns.h"
Michael J. Spencer 1:f5ac63519541 83 #include "netif/etharp.h"
Michael J. Spencer 1:f5ac63519541 84
Michael J. Spencer 1:f5ac63519541 85 #include <string.h>
Michael J. Spencer 1:f5ac63519541 86
Michael J. Spencer 1:f5ac63519541 87 /** Default for DHCP_GLOBAL_XID is 0xABCD0000
Michael J. Spencer 1:f5ac63519541 88 * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
Michael J. Spencer 1:f5ac63519541 89 * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
Michael J. Spencer 1:f5ac63519541 90 * #define DHCP_GLOBAL_XID rand()
Michael J. Spencer 1:f5ac63519541 91 */
Michael J. Spencer 1:f5ac63519541 92 #ifdef DHCP_GLOBAL_XID_HEADER
Michael J. Spencer 1:f5ac63519541 93 #include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
Michael J. Spencer 1:f5ac63519541 94 #endif
Michael J. Spencer 1:f5ac63519541 95
Michael J. Spencer 1:f5ac63519541 96 /** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
Michael J. Spencer 1:f5ac63519541 97 * MTU is checked to be big enough in dhcp_start */
Michael J. Spencer 1:f5ac63519541 98 #define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
Michael J. Spencer 1:f5ac63519541 99 #define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
Michael J. Spencer 1:f5ac63519541 100 /** Minimum length for reply before packet is parsed */
Michael J. Spencer 1:f5ac63519541 101 #define DHCP_MIN_REPLY_LEN 44
Michael J. Spencer 1:f5ac63519541 102
Michael J. Spencer 1:f5ac63519541 103 #define REBOOT_TRIES 2
Michael J. Spencer 1:f5ac63519541 104
Michael J. Spencer 1:f5ac63519541 105 /** Option handling: options are parsed in dhcp_parse_reply
Michael J. Spencer 1:f5ac63519541 106 * and saved in an array where other functions can load them from.
Michael J. Spencer 1:f5ac63519541 107 * This might be moved into the struct dhcp (not necessarily since
Michael J. Spencer 1:f5ac63519541 108 * lwIP is single-threaded and the array is only used while in recv
Michael J. Spencer 1:f5ac63519541 109 * callback). */
Michael J. Spencer 1:f5ac63519541 110 #define DHCP_OPTION_IDX_OVERLOAD 0
Michael J. Spencer 1:f5ac63519541 111 #define DHCP_OPTION_IDX_MSG_TYPE 1
Michael J. Spencer 1:f5ac63519541 112 #define DHCP_OPTION_IDX_SERVER_ID 2
Michael J. Spencer 1:f5ac63519541 113 #define DHCP_OPTION_IDX_LEASE_TIME 3
Michael J. Spencer 1:f5ac63519541 114 #define DHCP_OPTION_IDX_T1 4
Michael J. Spencer 1:f5ac63519541 115 #define DHCP_OPTION_IDX_T2 5
Michael J. Spencer 1:f5ac63519541 116 #define DHCP_OPTION_IDX_SUBNET_MASK 6
Michael J. Spencer 1:f5ac63519541 117 #define DHCP_OPTION_IDX_ROUTER 7
Michael J. Spencer 1:f5ac63519541 118 #define DHCP_OPTION_IDX_DNS_SERVER 8
Michael J. Spencer 1:f5ac63519541 119 #define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
Michael J. Spencer 1:f5ac63519541 120
Michael J. Spencer 1:f5ac63519541 121 /** Holds the decoded option values, only valid while in dhcp_recv.
Michael J. Spencer 1:f5ac63519541 122 @todo: move this into struct dhcp? */
Michael J. Spencer 1:f5ac63519541 123 u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
Michael J. Spencer 1:f5ac63519541 124 /** Holds a flag which option was received and is contained in dhcp_rx_options_val,
Michael J. Spencer 1:f5ac63519541 125 only valid while in dhcp_recv.
Michael J. Spencer 1:f5ac63519541 126 @todo: move this into struct dhcp? */
Michael J. Spencer 1:f5ac63519541 127 u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
Michael J. Spencer 1:f5ac63519541 128
Michael J. Spencer 1:f5ac63519541 129 #define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
Michael J. Spencer 1:f5ac63519541 130 #define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
Michael J. Spencer 1:f5ac63519541 131 #define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
Michael J. Spencer 1:f5ac63519541 132 #define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
Michael J. Spencer 1:f5ac63519541 133 #define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
Michael J. Spencer 1:f5ac63519541 134 #define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
Michael J. Spencer 1:f5ac63519541 135
Michael J. Spencer 1:f5ac63519541 136
Michael J. Spencer 1:f5ac63519541 137 /* DHCP client state machine functions */
Michael J. Spencer 1:f5ac63519541 138 static err_t dhcp_discover(struct netif *netif);
Michael J. Spencer 1:f5ac63519541 139 static err_t dhcp_select(struct netif *netif);
Michael J. Spencer 1:f5ac63519541 140 static void dhcp_bind(struct netif *netif);
Michael J. Spencer 1:f5ac63519541 141 #if DHCP_DOES_ARP_CHECK
Michael J. Spencer 1:f5ac63519541 142 static err_t dhcp_decline(struct netif *netif);
Michael J. Spencer 1:f5ac63519541 143 #endif /* DHCP_DOES_ARP_CHECK */
Michael J. Spencer 1:f5ac63519541 144 static err_t dhcp_rebind(struct netif *netif);
Michael J. Spencer 1:f5ac63519541 145 static err_t dhcp_reboot(struct netif *netif);
Michael J. Spencer 1:f5ac63519541 146 static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
Michael J. Spencer 1:f5ac63519541 147
Michael J. Spencer 1:f5ac63519541 148 /* receive, unfold, parse and free incoming messages */
Michael J. Spencer 1:f5ac63519541 149 static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
Michael J. Spencer 1:f5ac63519541 150
Michael J. Spencer 1:f5ac63519541 151 /* set the DHCP timers */
Michael J. Spencer 1:f5ac63519541 152 static void dhcp_timeout(struct netif *netif);
Michael J. Spencer 1:f5ac63519541 153 static void dhcp_t1_timeout(struct netif *netif);
Michael J. Spencer 1:f5ac63519541 154 static void dhcp_t2_timeout(struct netif *netif);
Michael J. Spencer 1:f5ac63519541 155
Michael J. Spencer 1:f5ac63519541 156 /* build outgoing messages */
Michael J. Spencer 1:f5ac63519541 157 /* create a DHCP message, fill in common headers */
Michael J. Spencer 1:f5ac63519541 158 static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
Michael J. Spencer 1:f5ac63519541 159 /* free a DHCP request */
Michael J. Spencer 1:f5ac63519541 160 static void dhcp_delete_msg(struct dhcp *dhcp);
Michael J. Spencer 1:f5ac63519541 161 /* add a DHCP option (type, then length in bytes) */
Michael J. Spencer 1:f5ac63519541 162 static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
Michael J. Spencer 1:f5ac63519541 163 /* add option values */
Michael J. Spencer 1:f5ac63519541 164 static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
Michael J. Spencer 1:f5ac63519541 165 static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
Michael J. Spencer 1:f5ac63519541 166 static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
Michael J. Spencer 1:f5ac63519541 167 /* always add the DHCP options trailer to end and pad */
Michael J. Spencer 1:f5ac63519541 168 static void dhcp_option_trailer(struct dhcp *dhcp);
Michael J. Spencer 1:f5ac63519541 169
Michael J. Spencer 1:f5ac63519541 170 /**
Michael J. Spencer 1:f5ac63519541 171 * Back-off the DHCP client (because of a received NAK response).
Michael J. Spencer 1:f5ac63519541 172 *
Michael J. Spencer 1:f5ac63519541 173 * Back-off the DHCP client because of a received NAK. Receiving a
Michael J. Spencer 1:f5ac63519541 174 * NAK means the client asked for something non-sensible, for
Michael J. Spencer 1:f5ac63519541 175 * example when it tries to renew a lease obtained on another network.
Michael J. Spencer 1:f5ac63519541 176 *
Michael J. Spencer 1:f5ac63519541 177 * We clear any existing set IP address and restart DHCP negotiation
Michael J. Spencer 1:f5ac63519541 178 * afresh (as per RFC2131 3.2.3).
Michael J. Spencer 1:f5ac63519541 179 *
Michael J. Spencer 1:f5ac63519541 180 * @param netif the netif under DHCP control
Michael J. Spencer 1:f5ac63519541 181 */
Michael J. Spencer 1:f5ac63519541 182 static void
Michael J. Spencer 1:f5ac63519541 183 dhcp_handle_nak(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 184 {
Michael J. Spencer 1:f5ac63519541 185 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
Michael J. Spencer 1:f5ac63519541 187 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
Michael J. Spencer 1:f5ac63519541 188 /* Set the interface down since the address must no longer be used, as per RFC2131 */
Michael J. Spencer 1:f5ac63519541 189 netif_set_down(netif);
Michael J. Spencer 1:f5ac63519541 190 /* remove IP address from interface */
Michael J. Spencer 1:f5ac63519541 191 netif_set_ipaddr(netif, IP_ADDR_ANY);
Michael J. Spencer 1:f5ac63519541 192 netif_set_gw(netif, IP_ADDR_ANY);
Michael J. Spencer 1:f5ac63519541 193 netif_set_netmask(netif, IP_ADDR_ANY);
Michael J. Spencer 1:f5ac63519541 194 /* Change to a defined state */
Michael J. Spencer 1:f5ac63519541 195 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
Michael J. Spencer 1:f5ac63519541 196 /* We can immediately restart discovery */
Michael J. Spencer 1:f5ac63519541 197 dhcp_discover(netif);
Michael J. Spencer 1:f5ac63519541 198 }
Michael J. Spencer 1:f5ac63519541 199
Michael J. Spencer 1:f5ac63519541 200 #if DHCP_DOES_ARP_CHECK
Michael J. Spencer 1:f5ac63519541 201 /**
Michael J. Spencer 1:f5ac63519541 202 * Checks if the offered IP address is already in use.
Michael J. Spencer 1:f5ac63519541 203 *
Michael J. Spencer 1:f5ac63519541 204 * It does so by sending an ARP request for the offered address and
Michael J. Spencer 1:f5ac63519541 205 * entering CHECKING state. If no ARP reply is received within a small
Michael J. Spencer 1:f5ac63519541 206 * interval, the address is assumed to be free for use by us.
Michael J. Spencer 1:f5ac63519541 207 *
Michael J. Spencer 1:f5ac63519541 208 * @param netif the netif under DHCP control
Michael J. Spencer 1:f5ac63519541 209 */
Michael J. Spencer 1:f5ac63519541 210 static void
Michael J. Spencer 1:f5ac63519541 211 dhcp_check(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 212 {
Michael J. Spencer 1:f5ac63519541 213 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 214 err_t result;
Michael J. Spencer 1:f5ac63519541 215 u16_t msecs;
Michael J. Spencer 1:f5ac63519541 216 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
Michael J. Spencer 1:f5ac63519541 217 (s16_t)netif->name[1]));
Michael J. Spencer 1:f5ac63519541 218 dhcp_set_state(dhcp, DHCP_CHECKING);
Michael J. Spencer 1:f5ac63519541 219 /* create an ARP query for the offered IP address, expecting that no host
Michael J. Spencer 1:f5ac63519541 220 responds, as the IP address should not be in use. */
Michael J. Spencer 1:f5ac63519541 221 result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
Michael J. Spencer 1:f5ac63519541 222 if (result != ERR_OK) {
Michael J. Spencer 1:f5ac63519541 223 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
Michael J. Spencer 1:f5ac63519541 224 }
Michael J. Spencer 1:f5ac63519541 225 dhcp->tries++;
Michael J. Spencer 1:f5ac63519541 226 msecs = 500;
Michael J. Spencer 1:f5ac63519541 227 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
Michael J. Spencer 1:f5ac63519541 228 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
Michael J. Spencer 1:f5ac63519541 229 }
Michael J. Spencer 1:f5ac63519541 230 #endif /* DHCP_DOES_ARP_CHECK */
Michael J. Spencer 1:f5ac63519541 231
Michael J. Spencer 1:f5ac63519541 232 /**
Michael J. Spencer 1:f5ac63519541 233 * Remember the configuration offered by a DHCP server.
Michael J. Spencer 1:f5ac63519541 234 *
Michael J. Spencer 1:f5ac63519541 235 * @param netif the netif under DHCP control
Michael J. Spencer 1:f5ac63519541 236 */
Michael J. Spencer 1:f5ac63519541 237 static void
Michael J. Spencer 1:f5ac63519541 238 dhcp_handle_offer(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 239 {
Michael J. Spencer 1:f5ac63519541 240 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 241 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
Michael J. Spencer 1:f5ac63519541 242 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
Michael J. Spencer 1:f5ac63519541 243 /* obtain the server address */
Michael J. Spencer 1:f5ac63519541 244 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
Michael J. Spencer 1:f5ac63519541 245 ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
Michael J. Spencer 1:f5ac63519541 246 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
Michael J. Spencer 1:f5ac63519541 247 ip4_addr_get_u32(&dhcp->server_ip_addr)));
Michael J. Spencer 1:f5ac63519541 248 /* remember offered address */
Michael J. Spencer 1:f5ac63519541 249 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
Michael J. Spencer 1:f5ac63519541 250 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
Michael J. Spencer 1:f5ac63519541 251 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
Michael J. Spencer 1:f5ac63519541 252
Michael J. Spencer 1:f5ac63519541 253 dhcp_select(netif);
Michael J. Spencer 1:f5ac63519541 254 } else {
Michael J. Spencer 1:f5ac63519541 255 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
Michael J. Spencer 1:f5ac63519541 256 ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
Michael J. Spencer 1:f5ac63519541 257 }
Michael J. Spencer 1:f5ac63519541 258 }
Michael J. Spencer 1:f5ac63519541 259
Michael J. Spencer 1:f5ac63519541 260 /**
Michael J. Spencer 1:f5ac63519541 261 * Select a DHCP server offer out of all offers.
Michael J. Spencer 1:f5ac63519541 262 *
Michael J. Spencer 1:f5ac63519541 263 * Simply select the first offer received.
Michael J. Spencer 1:f5ac63519541 264 *
Michael J. Spencer 1:f5ac63519541 265 * @param netif the netif under DHCP control
Michael J. Spencer 1:f5ac63519541 266 * @return lwIP specific error (see error.h)
Michael J. Spencer 1:f5ac63519541 267 */
Michael J. Spencer 1:f5ac63519541 268 static err_t
Michael J. Spencer 1:f5ac63519541 269 dhcp_select(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 270 {
Michael J. Spencer 1:f5ac63519541 271 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 272 err_t result;
Michael J. Spencer 1:f5ac63519541 273 u16_t msecs;
Michael J. Spencer 1:f5ac63519541 274
Michael J. Spencer 1:f5ac63519541 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));
Michael J. Spencer 1:f5ac63519541 276 dhcp_set_state(dhcp, DHCP_REQUESTING);
Michael J. Spencer 1:f5ac63519541 277
Michael J. Spencer 1:f5ac63519541 278 /* create and initialize the DHCP message header */
Michael J. Spencer 1:f5ac63519541 279 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
Michael J. Spencer 1:f5ac63519541 280 if (result == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 281 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
Michael J. Spencer 1:f5ac63519541 282 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
Michael J. Spencer 1:f5ac63519541 283
Michael J. Spencer 1:f5ac63519541 284 /* MUST request the offered IP address */
Michael J. Spencer 1:f5ac63519541 285 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
Michael J. Spencer 1:f5ac63519541 286 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
Michael J. Spencer 1:f5ac63519541 287
Michael J. Spencer 1:f5ac63519541 288 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
Michael J. Spencer 1:f5ac63519541 289 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
Michael J. Spencer 1:f5ac63519541 290
Michael J. Spencer 1:f5ac63519541 291 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
Michael J. Spencer 1:f5ac63519541 292 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
Michael J. Spencer 1:f5ac63519541 293 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
Michael J. Spencer 1:f5ac63519541 294 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
Michael J. Spencer 1:f5ac63519541 295 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
Michael J. Spencer 1:f5ac63519541 296
Michael J. Spencer 1:f5ac63519541 297 #if LWIP_NETIF_HOSTNAME
Michael J. Spencer 1:f5ac63519541 298 if (netif->hostname != NULL) {
Michael J. Spencer 1:f5ac63519541 299 const char *p = (const char*)netif->hostname;
Michael J. Spencer 1:f5ac63519541 300 u8_t namelen = (u8_t)strlen(p);
Michael J. Spencer 1:f5ac63519541 301 if (namelen > 0) {
Michael J. Spencer 1:f5ac63519541 302 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
Michael J. Spencer 1:f5ac63519541 303 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
Michael J. Spencer 1:f5ac63519541 304 while (*p) {
Michael J. Spencer 1:f5ac63519541 305 dhcp_option_byte(dhcp, *p++);
Michael J. Spencer 1:f5ac63519541 306 }
Michael J. Spencer 1:f5ac63519541 307 }
Michael J. Spencer 1:f5ac63519541 308 }
Michael J. Spencer 1:f5ac63519541 309 #endif /* LWIP_NETIF_HOSTNAME */
Michael J. Spencer 1:f5ac63519541 310
Michael J. Spencer 1:f5ac63519541 311 dhcp_option_trailer(dhcp);
Michael J. Spencer 1:f5ac63519541 312 /* shrink the pbuf to the actual content length */
Michael J. Spencer 1:f5ac63519541 313 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
Michael J. Spencer 1:f5ac63519541 314
Michael J. Spencer 1:f5ac63519541 315 /* send broadcast to any DHCP server */
Michael J. Spencer 1:f5ac63519541 316 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
Michael J. Spencer 1:f5ac63519541 317 dhcp_delete_msg(dhcp);
Michael J. Spencer 1:f5ac63519541 318 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
Michael J. Spencer 1:f5ac63519541 319 } else {
Michael J. Spencer 1:f5ac63519541 320 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
Michael J. Spencer 1:f5ac63519541 321 }
Michael J. Spencer 1:f5ac63519541 322 dhcp->tries++;
Michael J. Spencer 1:f5ac63519541 323 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
Michael J. Spencer 1:f5ac63519541 324 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
Michael J. Spencer 1:f5ac63519541 325 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
Michael J. Spencer 1:f5ac63519541 326 return result;
Michael J. Spencer 1:f5ac63519541 327 }
Michael J. Spencer 1:f5ac63519541 328
Michael J. Spencer 1:f5ac63519541 329 /**
Michael J. Spencer 1:f5ac63519541 330 * The DHCP timer that checks for lease renewal/rebind timeouts.
Michael J. Spencer 1:f5ac63519541 331 */
Michael J. Spencer 1:f5ac63519541 332 void
Michael J. Spencer 1:f5ac63519541 333 dhcp_coarse_tmr()
Michael J. Spencer 1:f5ac63519541 334 {
Michael J. Spencer 1:f5ac63519541 335 struct netif *netif = netif_list;
Michael J. Spencer 1:f5ac63519541 336 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
Michael J. Spencer 1:f5ac63519541 337 /* iterate through all network interfaces */
Michael J. Spencer 1:f5ac63519541 338 while (netif != NULL) {
Michael J. Spencer 1:f5ac63519541 339 /* only act on DHCP configured interfaces */
Michael J. Spencer 1:f5ac63519541 340 if (netif->dhcp != NULL) {
Michael J. Spencer 1:f5ac63519541 341 /* timer is active (non zero), and triggers (zeroes) now? */
Michael J. Spencer 1:f5ac63519541 342 if (netif->dhcp->t2_timeout-- == 1) {
Michael J. Spencer 1:f5ac63519541 343 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
Michael J. Spencer 1:f5ac63519541 344 /* this clients' rebind timeout triggered */
Michael J. Spencer 1:f5ac63519541 345 dhcp_t2_timeout(netif);
Michael J. Spencer 1:f5ac63519541 346 /* timer is active (non zero), and triggers (zeroes) now */
Michael J. Spencer 1:f5ac63519541 347 } else if (netif->dhcp->t1_timeout-- == 1) {
Michael J. Spencer 1:f5ac63519541 348 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
Michael J. Spencer 1:f5ac63519541 349 /* this clients' renewal timeout triggered */
Michael J. Spencer 1:f5ac63519541 350 dhcp_t1_timeout(netif);
Michael J. Spencer 1:f5ac63519541 351 }
Michael J. Spencer 1:f5ac63519541 352 }
Michael J. Spencer 1:f5ac63519541 353 /* proceed to next netif */
Michael J. Spencer 1:f5ac63519541 354 netif = netif->next;
Michael J. Spencer 1:f5ac63519541 355 }
Michael J. Spencer 1:f5ac63519541 356 }
Michael J. Spencer 1:f5ac63519541 357
Michael J. Spencer 1:f5ac63519541 358 /**
Michael J. Spencer 1:f5ac63519541 359 * DHCP transaction timeout handling
Michael J. Spencer 1:f5ac63519541 360 *
Michael J. Spencer 1:f5ac63519541 361 * A DHCP server is expected to respond within a short period of time.
Michael J. Spencer 1:f5ac63519541 362 * This timer checks whether an outstanding DHCP request is timed out.
Michael J. Spencer 1:f5ac63519541 363 */
Michael J. Spencer 1:f5ac63519541 364 void
Michael J. Spencer 1:f5ac63519541 365 dhcp_fine_tmr()
Michael J. Spencer 1:f5ac63519541 366 {
Michael J. Spencer 1:f5ac63519541 367 struct netif *netif = netif_list;
Michael J. Spencer 1:f5ac63519541 368 /* loop through netif's */
Michael J. Spencer 1:f5ac63519541 369 while (netif != NULL) {
Michael J. Spencer 1:f5ac63519541 370 /* only act on DHCP configured interfaces */
Michael J. Spencer 1:f5ac63519541 371 if (netif->dhcp != NULL) {
Michael J. Spencer 1:f5ac63519541 372 /* timer is active (non zero), and is about to trigger now */
Michael J. Spencer 1:f5ac63519541 373 if (netif->dhcp->request_timeout > 1) {
Michael J. Spencer 1:f5ac63519541 374 netif->dhcp->request_timeout--;
Michael J. Spencer 1:f5ac63519541 375 }
Michael J. Spencer 1:f5ac63519541 376 else if (netif->dhcp->request_timeout == 1) {
Michael J. Spencer 1:f5ac63519541 377 netif->dhcp->request_timeout--;
Michael J. Spencer 1:f5ac63519541 378 /* { netif->dhcp->request_timeout == 0 } */
Michael J. Spencer 1:f5ac63519541 379 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
Michael J. Spencer 1:f5ac63519541 380 /* this client's request timeout triggered */
Michael J. Spencer 1:f5ac63519541 381 dhcp_timeout(netif);
Michael J. Spencer 1:f5ac63519541 382 }
Michael J. Spencer 1:f5ac63519541 383 }
Michael J. Spencer 1:f5ac63519541 384 /* proceed to next network interface */
Michael J. Spencer 1:f5ac63519541 385 netif = netif->next;
Michael J. Spencer 1:f5ac63519541 386 }
Michael J. Spencer 1:f5ac63519541 387 }
Michael J. Spencer 1:f5ac63519541 388
Michael J. Spencer 1:f5ac63519541 389 /**
Michael J. Spencer 1:f5ac63519541 390 * A DHCP negotiation transaction, or ARP request, has timed out.
Michael J. Spencer 1:f5ac63519541 391 *
Michael J. Spencer 1:f5ac63519541 392 * The timer that was started with the DHCP or ARP request has
Michael J. Spencer 1:f5ac63519541 393 * timed out, indicating no response was received in time.
Michael J. Spencer 1:f5ac63519541 394 *
Michael J. Spencer 1:f5ac63519541 395 * @param netif the netif under DHCP control
Michael J. Spencer 1:f5ac63519541 396 */
Michael J. Spencer 1:f5ac63519541 397 static void
Michael J. Spencer 1:f5ac63519541 398 dhcp_timeout(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 399 {
Michael J. Spencer 1:f5ac63519541 400 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 401 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
Michael J. Spencer 1:f5ac63519541 402 /* back-off period has passed, or server selection timed out */
Michael J. Spencer 1:f5ac63519541 403 if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
Michael J. Spencer 1:f5ac63519541 404 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
Michael J. Spencer 1:f5ac63519541 405 dhcp_discover(netif);
Michael J. Spencer 1:f5ac63519541 406 /* receiving the requested lease timed out */
Michael J. Spencer 1:f5ac63519541 407 } else if (dhcp->state == DHCP_REQUESTING) {
Michael J. Spencer 1:f5ac63519541 408 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
Michael J. Spencer 1:f5ac63519541 409 if (dhcp->tries <= 5) {
Michael J. Spencer 1:f5ac63519541 410 dhcp_select(netif);
Michael J. Spencer 1:f5ac63519541 411 } else {
Michael J. Spencer 1:f5ac63519541 412 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
Michael J. Spencer 1:f5ac63519541 413 dhcp_release(netif);
Michael J. Spencer 1:f5ac63519541 414 dhcp_discover(netif);
Michael J. Spencer 1:f5ac63519541 415 }
Michael J. Spencer 1:f5ac63519541 416 #if DHCP_DOES_ARP_CHECK
Michael J. Spencer 1:f5ac63519541 417 /* received no ARP reply for the offered address (which is good) */
Michael J. Spencer 1:f5ac63519541 418 } else if (dhcp->state == DHCP_CHECKING) {
Michael J. Spencer 1:f5ac63519541 419 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
Michael J. Spencer 1:f5ac63519541 420 if (dhcp->tries <= 1) {
Michael J. Spencer 1:f5ac63519541 421 dhcp_check(netif);
Michael J. Spencer 1:f5ac63519541 422 /* no ARP replies on the offered address,
Michael J. Spencer 1:f5ac63519541 423 looks like the IP address is indeed free */
Michael J. Spencer 1:f5ac63519541 424 } else {
Michael J. Spencer 1:f5ac63519541 425 /* bind the interface to the offered address */
Michael J. Spencer 1:f5ac63519541 426 dhcp_bind(netif);
Michael J. Spencer 1:f5ac63519541 427 }
Michael J. Spencer 1:f5ac63519541 428 #endif /* DHCP_DOES_ARP_CHECK */
Michael J. Spencer 1:f5ac63519541 429 }
Michael J. Spencer 1:f5ac63519541 430 /* did not get response to renew request? */
Michael J. Spencer 1:f5ac63519541 431 else if (dhcp->state == DHCP_RENEWING) {
Michael J. Spencer 1:f5ac63519541 432 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
Michael J. Spencer 1:f5ac63519541 433 /* just retry renewal */
Michael J. Spencer 1:f5ac63519541 434 /* note that the rebind timer will eventually time-out if renew does not work */
Michael J. Spencer 1:f5ac63519541 435 dhcp_renew(netif);
Michael J. Spencer 1:f5ac63519541 436 /* did not get response to rebind request? */
Michael J. Spencer 1:f5ac63519541 437 } else if (dhcp->state == DHCP_REBINDING) {
Michael J. Spencer 1:f5ac63519541 438 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
Michael J. Spencer 1:f5ac63519541 439 if (dhcp->tries <= 8) {
Michael J. Spencer 1:f5ac63519541 440 dhcp_rebind(netif);
Michael J. Spencer 1:f5ac63519541 441 } else {
Michael J. Spencer 1:f5ac63519541 442 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
Michael J. Spencer 1:f5ac63519541 443 dhcp_release(netif);
Michael J. Spencer 1:f5ac63519541 444 dhcp_discover(netif);
Michael J. Spencer 1:f5ac63519541 445 }
Michael J. Spencer 1:f5ac63519541 446 } else if (dhcp->state == DHCP_REBOOTING) {
Michael J. Spencer 1:f5ac63519541 447 if (dhcp->tries < REBOOT_TRIES) {
Michael J. Spencer 1:f5ac63519541 448 dhcp_reboot(netif);
Michael J. Spencer 1:f5ac63519541 449 } else {
Michael J. Spencer 1:f5ac63519541 450 dhcp_discover(netif);
Michael J. Spencer 1:f5ac63519541 451 }
Michael J. Spencer 1:f5ac63519541 452 }
Michael J. Spencer 1:f5ac63519541 453 }
Michael J. Spencer 1:f5ac63519541 454
Michael J. Spencer 1:f5ac63519541 455 /**
Michael J. Spencer 1:f5ac63519541 456 * The renewal period has timed out.
Michael J. Spencer 1:f5ac63519541 457 *
Michael J. Spencer 1:f5ac63519541 458 * @param netif the netif under DHCP control
Michael J. Spencer 1:f5ac63519541 459 */
Michael J. Spencer 1:f5ac63519541 460 static void
Michael J. Spencer 1:f5ac63519541 461 dhcp_t1_timeout(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 462 {
Michael J. Spencer 1:f5ac63519541 463 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
Michael J. Spencer 1:f5ac63519541 465 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
Michael J. Spencer 1:f5ac63519541 466 (dhcp->state == DHCP_RENEWING)) {
Michael J. Spencer 1:f5ac63519541 467 /* just retry to renew - note that the rebind timer (t2) will
Michael J. Spencer 1:f5ac63519541 468 * eventually time-out if renew tries fail. */
Michael J. Spencer 1:f5ac63519541 469 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
Michael J. Spencer 1:f5ac63519541 470 ("dhcp_t1_timeout(): must renew\n"));
Michael J. Spencer 1:f5ac63519541 471 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
Michael J. Spencer 1:f5ac63519541 472 DHCP_RENEWING, not DHCP_BOUND */
Michael J. Spencer 1:f5ac63519541 473 dhcp_renew(netif);
Michael J. Spencer 1:f5ac63519541 474 }
Michael J. Spencer 1:f5ac63519541 475 }
Michael J. Spencer 1:f5ac63519541 476
Michael J. Spencer 1:f5ac63519541 477 /**
Michael J. Spencer 1:f5ac63519541 478 * The rebind period has timed out.
Michael J. Spencer 1:f5ac63519541 479 *
Michael J. Spencer 1:f5ac63519541 480 * @param netif the netif under DHCP control
Michael J. Spencer 1:f5ac63519541 481 */
Michael J. Spencer 1:f5ac63519541 482 static void
Michael J. Spencer 1:f5ac63519541 483 dhcp_t2_timeout(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 484 {
Michael J. Spencer 1:f5ac63519541 485 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 486 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
Michael J. Spencer 1:f5ac63519541 487 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
Michael J. Spencer 1:f5ac63519541 488 (dhcp->state == DHCP_RENEWING)) {
Michael J. Spencer 1:f5ac63519541 489 /* just retry to rebind */
Michael J. Spencer 1:f5ac63519541 490 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
Michael J. Spencer 1:f5ac63519541 491 ("dhcp_t2_timeout(): must rebind\n"));
Michael J. Spencer 1:f5ac63519541 492 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
Michael J. Spencer 1:f5ac63519541 493 DHCP_REBINDING, not DHCP_BOUND */
Michael J. Spencer 1:f5ac63519541 494 dhcp_rebind(netif);
Michael J. Spencer 1:f5ac63519541 495 }
Michael J. Spencer 1:f5ac63519541 496 }
Michael J. Spencer 1:f5ac63519541 497
Michael J. Spencer 1:f5ac63519541 498 /**
Michael J. Spencer 1:f5ac63519541 499 * Handle a DHCP ACK packet
Michael J. Spencer 1:f5ac63519541 500 *
Michael J. Spencer 1:f5ac63519541 501 * @param netif the netif under DHCP control
Michael J. Spencer 1:f5ac63519541 502 */
Michael J. Spencer 1:f5ac63519541 503 static void
Michael J. Spencer 1:f5ac63519541 504 dhcp_handle_ack(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 505 {
Michael J. Spencer 1:f5ac63519541 506 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 507 #if LWIP_DNS
Michael J. Spencer 1:f5ac63519541 508 u8_t n;
Michael J. Spencer 1:f5ac63519541 509 #endif /* LWIP_DNS */
Michael J. Spencer 1:f5ac63519541 510
Michael J. Spencer 1:f5ac63519541 511 /* clear options we might not get from the ACK */
Michael J. Spencer 1:f5ac63519541 512 ip_addr_set_zero(&dhcp->offered_sn_mask);
Michael J. Spencer 1:f5ac63519541 513 ip_addr_set_zero(&dhcp->offered_gw_addr);
Michael J. Spencer 1:f5ac63519541 514 #if LWIP_DHCP_BOOTP_FILE
Michael J. Spencer 1:f5ac63519541 515 ip_addr_set_zero(&dhcp->offered_si_addr);
Michael J. Spencer 1:f5ac63519541 516 #endif /* LWIP_DHCP_BOOTP_FILE */
Michael J. Spencer 1:f5ac63519541 517
Michael J. Spencer 1:f5ac63519541 518 /* lease time given? */
Michael J. Spencer 1:f5ac63519541 519 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
Michael J. Spencer 1:f5ac63519541 520 /* remember offered lease time */
Michael J. Spencer 1:f5ac63519541 521 dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
Michael J. Spencer 1:f5ac63519541 522 }
Michael J. Spencer 1:f5ac63519541 523 /* renewal period given? */
Michael J. Spencer 1:f5ac63519541 524 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
Michael J. Spencer 1:f5ac63519541 525 /* remember given renewal period */
Michael J. Spencer 1:f5ac63519541 526 dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
Michael J. Spencer 1:f5ac63519541 527 } else {
Michael J. Spencer 1:f5ac63519541 528 /* calculate safe periods for renewal */
Michael J. Spencer 1:f5ac63519541 529 dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
Michael J. Spencer 1:f5ac63519541 530 }
Michael J. Spencer 1:f5ac63519541 531
Michael J. Spencer 1:f5ac63519541 532 /* renewal period given? */
Michael J. Spencer 1:f5ac63519541 533 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
Michael J. Spencer 1:f5ac63519541 534 /* remember given rebind period */
Michael J. Spencer 1:f5ac63519541 535 dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
Michael J. Spencer 1:f5ac63519541 536 } else {
Michael J. Spencer 1:f5ac63519541 537 /* calculate safe periods for rebinding */
Michael J. Spencer 1:f5ac63519541 538 dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
Michael J. Spencer 1:f5ac63519541 539 }
Michael J. Spencer 1:f5ac63519541 540
Michael J. Spencer 1:f5ac63519541 541 /* (y)our internet address */
Michael J. Spencer 1:f5ac63519541 542 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
Michael J. Spencer 1:f5ac63519541 543
Michael J. Spencer 1:f5ac63519541 544 #if LWIP_DHCP_BOOTP_FILE
Michael J. Spencer 1:f5ac63519541 545 /* copy boot server address,
Michael J. Spencer 1:f5ac63519541 546 boot file name copied in dhcp_parse_reply if not overloaded */
Michael J. Spencer 1:f5ac63519541 547 ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
Michael J. Spencer 1:f5ac63519541 548 #endif /* LWIP_DHCP_BOOTP_FILE */
Michael J. Spencer 1:f5ac63519541 549
Michael J. Spencer 1:f5ac63519541 550 /* subnet mask given? */
Michael J. Spencer 1:f5ac63519541 551 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
Michael J. Spencer 1:f5ac63519541 552 /* remember given subnet mask */
Michael J. Spencer 1:f5ac63519541 553 ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
Michael J. Spencer 1:f5ac63519541 554 dhcp->subnet_mask_given = 1;
Michael J. Spencer 1:f5ac63519541 555 } else {
Michael J. Spencer 1:f5ac63519541 556 dhcp->subnet_mask_given = 0;
Michael J. Spencer 1:f5ac63519541 557 }
Michael J. Spencer 1:f5ac63519541 558
Michael J. Spencer 1:f5ac63519541 559 /* gateway router */
Michael J. Spencer 1:f5ac63519541 560 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
Michael J. Spencer 1:f5ac63519541 561 ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
Michael J. Spencer 1:f5ac63519541 562 }
Michael J. Spencer 1:f5ac63519541 563
Michael J. Spencer 1:f5ac63519541 564 #if LWIP_DNS
Michael J. Spencer 1:f5ac63519541 565 /* DNS servers */
Michael J. Spencer 1:f5ac63519541 566 n = 0;
Michael J. Spencer 1:f5ac63519541 567 while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
Michael J. Spencer 1:f5ac63519541 568 ip_addr_t dns_addr;
Michael J. Spencer 1:f5ac63519541 569 ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
Michael J. Spencer 1:f5ac63519541 570 dns_setserver(n, &dns_addr);
Michael J. Spencer 1:f5ac63519541 571 n++;
Michael J. Spencer 1:f5ac63519541 572 }
Michael J. Spencer 1:f5ac63519541 573 #endif /* LWIP_DNS */
Michael J. Spencer 1:f5ac63519541 574 }
Michael J. Spencer 1:f5ac63519541 575
Michael J. Spencer 1:f5ac63519541 576 /** Set a statically allocated struct dhcp to work with.
Michael J. Spencer 1:f5ac63519541 577 * Using this prevents dhcp_start to allocate it using mem_malloc.
Michael J. Spencer 1:f5ac63519541 578 *
Michael J. Spencer 1:f5ac63519541 579 * @param netif the netif for which to set the struct dhcp
Michael J. Spencer 1:f5ac63519541 580 * @param dhcp (uninitialised) dhcp struct allocated by the application
Michael J. Spencer 1:f5ac63519541 581 */
Michael J. Spencer 1:f5ac63519541 582 void
Michael J. Spencer 1:f5ac63519541 583 dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
Michael J. Spencer 1:f5ac63519541 584 {
Michael J. Spencer 1:f5ac63519541 585 LWIP_ASSERT("netif != NULL", netif != NULL);
Michael J. Spencer 1:f5ac63519541 586 LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
Michael J. Spencer 1:f5ac63519541 587 LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
Michael J. Spencer 1:f5ac63519541 588
Michael J. Spencer 1:f5ac63519541 589 /* clear data structure */
Michael J. Spencer 1:f5ac63519541 590 memset(dhcp, 0, sizeof(struct dhcp));
Michael J. Spencer 1:f5ac63519541 591 /* dhcp_set_state(&dhcp, DHCP_OFF); */
Michael J. Spencer 1:f5ac63519541 592 netif->dhcp = dhcp;
Michael J. Spencer 1:f5ac63519541 593 }
Michael J. Spencer 1:f5ac63519541 594
Michael J. Spencer 1:f5ac63519541 595 /**
Michael J. Spencer 1:f5ac63519541 596 * Start DHCP negotiation for a network interface.
Michael J. Spencer 1:f5ac63519541 597 *
Michael J. Spencer 1:f5ac63519541 598 * If no DHCP client instance was attached to this interface,
Michael J. Spencer 1:f5ac63519541 599 * a new client is created first. If a DHCP client instance
Michael J. Spencer 1:f5ac63519541 600 * was already present, it restarts negotiation.
Michael J. Spencer 1:f5ac63519541 601 *
Michael J. Spencer 1:f5ac63519541 602 * @param netif The lwIP network interface
Michael J. Spencer 1:f5ac63519541 603 * @return lwIP error code
Michael J. Spencer 1:f5ac63519541 604 * - ERR_OK - No error
Michael J. Spencer 1:f5ac63519541 605 * - ERR_MEM - Out of memory
Michael J. Spencer 1:f5ac63519541 606 */
Michael J. Spencer 1:f5ac63519541 607 err_t
Michael J. Spencer 1:f5ac63519541 608 dhcp_start(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 609 {
Michael J. Spencer 1:f5ac63519541 610 struct dhcp *dhcp;
Michael J. Spencer 1:f5ac63519541 611 err_t result = ERR_OK;
Michael J. Spencer 1:f5ac63519541 612
Michael J. Spencer 1:f5ac63519541 613 LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
Michael J. Spencer 1:f5ac63519541 614 dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 615 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
Michael J. Spencer 1:f5ac63519541 616 /* Remove the flag that says this netif is handled by DHCP,
Michael J. Spencer 1:f5ac63519541 617 it is set when we succeeded starting. */
Michael J. Spencer 1:f5ac63519541 618 netif->flags &= ~NETIF_FLAG_DHCP;
Michael J. Spencer 1:f5ac63519541 619
Michael J. Spencer 1:f5ac63519541 620 /* check hwtype of the netif */
Michael J. Spencer 1:f5ac63519541 621 if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
Michael J. Spencer 1:f5ac63519541 622 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
Michael J. Spencer 1:f5ac63519541 623 return ERR_ARG;
Michael J. Spencer 1:f5ac63519541 624 }
Michael J. Spencer 1:f5ac63519541 625
Michael J. Spencer 1:f5ac63519541 626 /* check MTU of the netif */
Michael J. Spencer 1:f5ac63519541 627 if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
Michael J. Spencer 1:f5ac63519541 628 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
Michael J. Spencer 1:f5ac63519541 629 return ERR_MEM;
Michael J. Spencer 1:f5ac63519541 630 }
Michael J. Spencer 1:f5ac63519541 631
Michael J. Spencer 1:f5ac63519541 632 /* no DHCP client attached yet? */
Michael J. Spencer 1:f5ac63519541 633 if (dhcp == NULL) {
Michael J. Spencer 1:f5ac63519541 634 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
Michael J. Spencer 1:f5ac63519541 635 dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
Michael J. Spencer 1:f5ac63519541 636 if (dhcp == NULL) {
Michael J. Spencer 1:f5ac63519541 637 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
Michael J. Spencer 1:f5ac63519541 638 return ERR_MEM;
Michael J. Spencer 1:f5ac63519541 639 }
Michael J. Spencer 1:f5ac63519541 640 /* store this dhcp client in the netif */
Michael J. Spencer 1:f5ac63519541 641 netif->dhcp = dhcp;
Michael J. Spencer 1:f5ac63519541 642 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
Michael J. Spencer 1:f5ac63519541 643 /* already has DHCP client attached */
Michael J. Spencer 1:f5ac63519541 644 } else {
Michael J. Spencer 1:f5ac63519541 645 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
Michael J. Spencer 1:f5ac63519541 646 if (dhcp->pcb != NULL) {
Michael J. Spencer 1:f5ac63519541 647 udp_remove(dhcp->pcb);
Michael J. Spencer 1:f5ac63519541 648 }
Michael J. Spencer 1:f5ac63519541 649 LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
Michael J. Spencer 1:f5ac63519541 650 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
Michael J. Spencer 1:f5ac63519541 651 }
Michael J. Spencer 1:f5ac63519541 652
Michael J. Spencer 1:f5ac63519541 653 /* clear data structure */
Michael J. Spencer 1:f5ac63519541 654 memset(dhcp, 0, sizeof(struct dhcp));
Michael J. Spencer 1:f5ac63519541 655 /* dhcp_set_state(&dhcp, DHCP_OFF); */
Michael J. Spencer 1:f5ac63519541 656 /* allocate UDP PCB */
Michael J. Spencer 1:f5ac63519541 657 dhcp->pcb = udp_new();
Michael J. Spencer 1:f5ac63519541 658 if (dhcp->pcb == NULL) {
Michael J. Spencer 1:f5ac63519541 659 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
Michael J. Spencer 1:f5ac63519541 660 return ERR_MEM;
Michael J. Spencer 1:f5ac63519541 661 }
Michael J. Spencer 1:f5ac63519541 662 dhcp->pcb->so_options |= SOF_BROADCAST;
Michael J. Spencer 1:f5ac63519541 663 /* set up local and remote port for the pcb */
Michael J. Spencer 1:f5ac63519541 664 udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
Michael J. Spencer 1:f5ac63519541 665 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
Michael J. Spencer 1:f5ac63519541 666 /* set up the recv callback and argument */
Michael J. Spencer 1:f5ac63519541 667 udp_recv(dhcp->pcb, dhcp_recv, netif);
Michael J. Spencer 1:f5ac63519541 668 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
Michael J. Spencer 1:f5ac63519541 669 /* (re)start the DHCP negotiation */
Michael J. Spencer 1:f5ac63519541 670 result = dhcp_discover(netif);
Michael J. Spencer 1:f5ac63519541 671 if (result != ERR_OK) {
Michael J. Spencer 1:f5ac63519541 672 /* free resources allocated above */
Michael J. Spencer 1:f5ac63519541 673 dhcp_stop(netif);
Michael J. Spencer 1:f5ac63519541 674 return ERR_MEM;
Michael J. Spencer 1:f5ac63519541 675 }
Michael J. Spencer 1:f5ac63519541 676 /* Set the flag that says this netif is handled by DHCP. */
Michael J. Spencer 1:f5ac63519541 677 netif->flags |= NETIF_FLAG_DHCP;
Michael J. Spencer 1:f5ac63519541 678 return result;
Michael J. Spencer 1:f5ac63519541 679 }
Michael J. Spencer 1:f5ac63519541 680
Michael J. Spencer 1:f5ac63519541 681 /**
Michael J. Spencer 1:f5ac63519541 682 * Inform a DHCP server of our manual configuration.
Michael J. Spencer 1:f5ac63519541 683 *
Michael J. Spencer 1:f5ac63519541 684 * This informs DHCP servers of our fixed IP address configuration
Michael J. Spencer 1:f5ac63519541 685 * by sending an INFORM message. It does not involve DHCP address
Michael J. Spencer 1:f5ac63519541 686 * configuration, it is just here to be nice to the network.
Michael J. Spencer 1:f5ac63519541 687 *
Michael J. Spencer 1:f5ac63519541 688 * @param netif The lwIP network interface
Michael J. Spencer 1:f5ac63519541 689 */
Michael J. Spencer 1:f5ac63519541 690 void
Michael J. Spencer 1:f5ac63519541 691 dhcp_inform(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 692 {
Michael J. Spencer 1:f5ac63519541 693 struct dhcp dhcp;
Michael J. Spencer 1:f5ac63519541 694 err_t result = ERR_OK;
Michael J. Spencer 1:f5ac63519541 695 struct udp_pcb *pcb;
Michael J. Spencer 1:f5ac63519541 696
Michael J. Spencer 1:f5ac63519541 697 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
Michael J. Spencer 1:f5ac63519541 698
Michael J. Spencer 1:f5ac63519541 699 memset(&dhcp, 0, sizeof(struct dhcp));
Michael J. Spencer 1:f5ac63519541 700 dhcp_set_state(&dhcp, DHCP_INFORM);
Michael J. Spencer 1:f5ac63519541 701
Michael J. Spencer 1:f5ac63519541 702 if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
Michael J. Spencer 1:f5ac63519541 703 /* re-use existing pcb */
Michael J. Spencer 1:f5ac63519541 704 pcb = netif->dhcp->pcb;
Michael J. Spencer 1:f5ac63519541 705 } else {
Michael J. Spencer 1:f5ac63519541 706 pcb = udp_new();
Michael J. Spencer 1:f5ac63519541 707 if (pcb == NULL) {
Michael J. Spencer 1:f5ac63519541 708 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
Michael J. Spencer 1:f5ac63519541 709 return;
Michael J. Spencer 1:f5ac63519541 710 }
Michael J. Spencer 1:f5ac63519541 711 dhcp.pcb = pcb;
Michael J. Spencer 1:f5ac63519541 712 dhcp.pcb->so_options |= SOF_BROADCAST;
Michael J. Spencer 1:f5ac63519541 713 udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
Michael J. Spencer 1:f5ac63519541 714 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
Michael J. Spencer 1:f5ac63519541 715 }
Michael J. Spencer 1:f5ac63519541 716 /* create and initialize the DHCP message header */
Michael J. Spencer 1:f5ac63519541 717 result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
Michael J. Spencer 1:f5ac63519541 718 if (result == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 719 dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
Michael J. Spencer 1:f5ac63519541 720 dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
Michael J. Spencer 1:f5ac63519541 721
Michael J. Spencer 1:f5ac63519541 722 dhcp_option_trailer(&dhcp);
Michael J. Spencer 1:f5ac63519541 723
Michael J. Spencer 1:f5ac63519541 724 pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
Michael J. Spencer 1:f5ac63519541 725
Michael J. Spencer 1:f5ac63519541 726 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
Michael J. Spencer 1:f5ac63519541 727 udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
Michael J. Spencer 1:f5ac63519541 728 dhcp_delete_msg(&dhcp);
Michael J. Spencer 1:f5ac63519541 729 } else {
Michael J. Spencer 1:f5ac63519541 730 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
Michael J. Spencer 1:f5ac63519541 731 }
Michael J. Spencer 1:f5ac63519541 732
Michael J. Spencer 1:f5ac63519541 733 if (dhcp.pcb != NULL) {
Michael J. Spencer 1:f5ac63519541 734 /* otherwise, the existing pcb was used */
Michael J. Spencer 1:f5ac63519541 735 udp_remove(dhcp.pcb);
Michael J. Spencer 1:f5ac63519541 736 }
Michael J. Spencer 1:f5ac63519541 737 }
Michael J. Spencer 1:f5ac63519541 738
Michael J. Spencer 1:f5ac63519541 739 /** Handle a possible change in the network configuration.
Michael J. Spencer 1:f5ac63519541 740 *
Michael J. Spencer 1:f5ac63519541 741 * This enters the REBOOTING state to verify that the currently bound
Michael J. Spencer 1:f5ac63519541 742 * address is still valid.
Michael J. Spencer 1:f5ac63519541 743 */
Michael J. Spencer 1:f5ac63519541 744 void
Michael J. Spencer 1:f5ac63519541 745 dhcp_network_changed(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 746 {
Michael J. Spencer 1:f5ac63519541 747 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 748 if (!dhcp)
Michael J. Spencer 1:f5ac63519541 749 return;
Michael J. Spencer 1:f5ac63519541 750 switch (dhcp->state) {
Michael J. Spencer 1:f5ac63519541 751 case DHCP_REBINDING:
Michael J. Spencer 1:f5ac63519541 752 case DHCP_RENEWING:
Michael J. Spencer 1:f5ac63519541 753 case DHCP_BOUND:
Michael J. Spencer 1:f5ac63519541 754 case DHCP_REBOOTING:
Michael J. Spencer 1:f5ac63519541 755 netif_set_down(netif);
Michael J. Spencer 1:f5ac63519541 756 dhcp->tries = 0;
Michael J. Spencer 1:f5ac63519541 757 dhcp_reboot(netif);
Michael J. Spencer 1:f5ac63519541 758 break;
Michael J. Spencer 1:f5ac63519541 759 case DHCP_OFF:
Michael J. Spencer 1:f5ac63519541 760 /* stay off */
Michael J. Spencer 1:f5ac63519541 761 break;
Michael J. Spencer 1:f5ac63519541 762 default:
Michael J. Spencer 1:f5ac63519541 763 dhcp->tries = 0;
Michael J. Spencer 1:f5ac63519541 764 #if LWIP_DHCP_AUTOIP_COOP
Michael J. Spencer 1:f5ac63519541 765 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
Michael J. Spencer 1:f5ac63519541 766 #endif /* LWIP_DHCP_AUTOIP_COOP */
Michael J. Spencer 1:f5ac63519541 767 dhcp_discover(netif);
Michael J. Spencer 1:f5ac63519541 768 break;
Michael J. Spencer 1:f5ac63519541 769 }
Michael J. Spencer 1:f5ac63519541 770 }
Michael J. Spencer 1:f5ac63519541 771
Michael J. Spencer 1:f5ac63519541 772 #if DHCP_DOES_ARP_CHECK
Michael J. Spencer 1:f5ac63519541 773 /**
Michael J. Spencer 1:f5ac63519541 774 * Match an ARP reply with the offered IP address.
Michael J. Spencer 1:f5ac63519541 775 *
Michael J. Spencer 1:f5ac63519541 776 * @param netif the network interface on which the reply was received
Michael J. Spencer 1:f5ac63519541 777 * @param addr The IP address we received a reply from
Michael J. Spencer 1:f5ac63519541 778 */
Michael J. Spencer 1:f5ac63519541 779 void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
Michael J. Spencer 1:f5ac63519541 780 {
Michael J. Spencer 1:f5ac63519541 781 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
Michael J. Spencer 1:f5ac63519541 782 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
Michael J. Spencer 1:f5ac63519541 783 /* is a DHCP client doing an ARP check? */
Michael J. Spencer 1:f5ac63519541 784 if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
Michael J. Spencer 1:f5ac63519541 785 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
Michael J. Spencer 1:f5ac63519541 786 ip4_addr_get_u32(addr)));
Michael J. Spencer 1:f5ac63519541 787 /* did a host respond with the address we
Michael J. Spencer 1:f5ac63519541 788 were offered by the DHCP server? */
Michael J. Spencer 1:f5ac63519541 789 if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
Michael J. Spencer 1:f5ac63519541 790 /* we will not accept the offered address */
Michael J. Spencer 1:f5ac63519541 791 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
Michael J. Spencer 1:f5ac63519541 792 ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
Michael J. Spencer 1:f5ac63519541 793 dhcp_decline(netif);
Michael J. Spencer 1:f5ac63519541 794 }
Michael J. Spencer 1:f5ac63519541 795 }
Michael J. Spencer 1:f5ac63519541 796 }
Michael J. Spencer 1:f5ac63519541 797
Michael J. Spencer 1:f5ac63519541 798 /**
Michael J. Spencer 1:f5ac63519541 799 * Decline an offered lease.
Michael J. Spencer 1:f5ac63519541 800 *
Michael J. Spencer 1:f5ac63519541 801 * Tell the DHCP server we do not accept the offered address.
Michael J. Spencer 1:f5ac63519541 802 * One reason to decline the lease is when we find out the address
Michael J. Spencer 1:f5ac63519541 803 * is already in use by another host (through ARP).
Michael J. Spencer 1:f5ac63519541 804 *
Michael J. Spencer 1:f5ac63519541 805 * @param netif the netif under DHCP control
Michael J. Spencer 1:f5ac63519541 806 */
Michael J. Spencer 1:f5ac63519541 807 static err_t
Michael J. Spencer 1:f5ac63519541 808 dhcp_decline(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 809 {
Michael J. Spencer 1:f5ac63519541 810 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 811 err_t result = ERR_OK;
Michael J. Spencer 1:f5ac63519541 812 u16_t msecs;
Michael J. Spencer 1:f5ac63519541 813 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
Michael J. Spencer 1:f5ac63519541 814 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
Michael J. Spencer 1:f5ac63519541 815 /* create and initialize the DHCP message header */
Michael J. Spencer 1:f5ac63519541 816 result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
Michael J. Spencer 1:f5ac63519541 817 if (result == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 818 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
Michael J. Spencer 1:f5ac63519541 819 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
Michael J. Spencer 1:f5ac63519541 820
Michael J. Spencer 1:f5ac63519541 821 dhcp_option_trailer(dhcp);
Michael J. Spencer 1:f5ac63519541 822 /* resize pbuf to reflect true size of options */
Michael J. Spencer 1:f5ac63519541 823 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
Michael J. Spencer 1:f5ac63519541 824
Michael J. Spencer 1:f5ac63519541 825 /* per section 4.4.4, broadcast DECLINE messages */
Michael J. Spencer 1:f5ac63519541 826 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
Michael J. Spencer 1:f5ac63519541 827 dhcp_delete_msg(dhcp);
Michael J. Spencer 1:f5ac63519541 828 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
Michael J. Spencer 1:f5ac63519541 829 } else {
Michael J. Spencer 1:f5ac63519541 830 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
Michael J. Spencer 1:f5ac63519541 831 ("dhcp_decline: could not allocate DHCP request\n"));
Michael J. Spencer 1:f5ac63519541 832 }
Michael J. Spencer 1:f5ac63519541 833 dhcp->tries++;
Michael J. Spencer 1:f5ac63519541 834 msecs = 10*1000;
Michael J. Spencer 1:f5ac63519541 835 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
Michael J. Spencer 1:f5ac63519541 836 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
Michael J. Spencer 1:f5ac63519541 837 return result;
Michael J. Spencer 1:f5ac63519541 838 }
Michael J. Spencer 1:f5ac63519541 839 #endif /* DHCP_DOES_ARP_CHECK */
Michael J. Spencer 1:f5ac63519541 840
Michael J. Spencer 1:f5ac63519541 841
Michael J. Spencer 1:f5ac63519541 842 /**
Michael J. Spencer 1:f5ac63519541 843 * Start the DHCP process, discover a DHCP server.
Michael J. Spencer 1:f5ac63519541 844 *
Michael J. Spencer 1:f5ac63519541 845 * @param netif the netif under DHCP control
Michael J. Spencer 1:f5ac63519541 846 */
Michael J. Spencer 1:f5ac63519541 847 static err_t
Michael J. Spencer 1:f5ac63519541 848 dhcp_discover(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 849 {
Michael J. Spencer 1:f5ac63519541 850 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 851 err_t result = ERR_OK;
Michael J. Spencer 1:f5ac63519541 852 u16_t msecs;
Michael J. Spencer 1:f5ac63519541 853 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
Michael J. Spencer 1:f5ac63519541 854 ip_addr_set_any(&dhcp->offered_ip_addr);
Michael J. Spencer 1:f5ac63519541 855 dhcp_set_state(dhcp, DHCP_SELECTING);
Michael J. Spencer 1:f5ac63519541 856 /* create and initialize the DHCP message header */
Michael J. Spencer 1:f5ac63519541 857 result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
Michael J. Spencer 1:f5ac63519541 858 if (result == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 859 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
Michael J. Spencer 1:f5ac63519541 860
Michael J. Spencer 1:f5ac63519541 861 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
Michael J. Spencer 1:f5ac63519541 862 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
Michael J. Spencer 1:f5ac63519541 863
Michael J. Spencer 1:f5ac63519541 864 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
Michael J. Spencer 1:f5ac63519541 865 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
Michael J. Spencer 1:f5ac63519541 866 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
Michael J. Spencer 1:f5ac63519541 867 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
Michael J. Spencer 1:f5ac63519541 868 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
Michael J. Spencer 1:f5ac63519541 869
Michael J. Spencer 1:f5ac63519541 870 dhcp_option_trailer(dhcp);
Michael J. Spencer 1:f5ac63519541 871
Michael J. Spencer 1:f5ac63519541 872 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
Michael J. Spencer 1:f5ac63519541 873 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
Michael J. Spencer 1:f5ac63519541 874
Michael J. Spencer 1:f5ac63519541 875 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
Michael J. Spencer 1:f5ac63519541 876 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
Michael J. Spencer 1:f5ac63519541 877 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
Michael J. Spencer 1:f5ac63519541 878 dhcp_delete_msg(dhcp);
Michael J. Spencer 1:f5ac63519541 879 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
Michael J. Spencer 1:f5ac63519541 880 } else {
Michael J. Spencer 1:f5ac63519541 881 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
Michael J. Spencer 1:f5ac63519541 882 }
Michael J. Spencer 1:f5ac63519541 883 dhcp->tries++;
Michael J. Spencer 1:f5ac63519541 884 #if LWIP_DHCP_AUTOIP_COOP
Michael J. Spencer 1:f5ac63519541 885 if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
Michael J. Spencer 1:f5ac63519541 886 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
Michael J. Spencer 1:f5ac63519541 887 autoip_start(netif);
Michael J. Spencer 1:f5ac63519541 888 }
Michael J. Spencer 1:f5ac63519541 889 #endif /* LWIP_DHCP_AUTOIP_COOP */
Michael J. Spencer 1:f5ac63519541 890 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
Michael J. Spencer 1:f5ac63519541 891 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
Michael J. Spencer 1:f5ac63519541 892 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
Michael J. Spencer 1:f5ac63519541 893 return result;
Michael J. Spencer 1:f5ac63519541 894 }
Michael J. Spencer 1:f5ac63519541 895
Michael J. Spencer 1:f5ac63519541 896
Michael J. Spencer 1:f5ac63519541 897 /**
Michael J. Spencer 1:f5ac63519541 898 * Bind the interface to the offered IP address.
Michael J. Spencer 1:f5ac63519541 899 *
Michael J. Spencer 1:f5ac63519541 900 * @param netif network interface to bind to the offered address
Michael J. Spencer 1:f5ac63519541 901 */
Michael J. Spencer 1:f5ac63519541 902 static void
Michael J. Spencer 1:f5ac63519541 903 dhcp_bind(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 904 {
Michael J. Spencer 1:f5ac63519541 905 u32_t timeout;
Michael J. Spencer 1:f5ac63519541 906 struct dhcp *dhcp;
Michael J. Spencer 1:f5ac63519541 907 ip_addr_t sn_mask, gw_addr;
Michael J. Spencer 1:f5ac63519541 908 LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
Michael J. Spencer 1:f5ac63519541 909 dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 910 LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
Michael J. Spencer 1:f5ac63519541 911 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
Michael J. Spencer 1:f5ac63519541 912
Michael J. Spencer 1:f5ac63519541 913 /* temporary DHCP lease? */
Michael J. Spencer 1:f5ac63519541 914 if (dhcp->offered_t1_renew != 0xffffffffUL) {
Michael J. Spencer 1:f5ac63519541 915 /* set renewal period timer */
Michael J. Spencer 1:f5ac63519541 916 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
Michael J. Spencer 1:f5ac63519541 917 timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
Michael J. Spencer 1:f5ac63519541 918 if(timeout > 0xffff) {
Michael J. Spencer 1:f5ac63519541 919 timeout = 0xffff;
Michael J. Spencer 1:f5ac63519541 920 }
Michael J. Spencer 1:f5ac63519541 921 dhcp->t1_timeout = (u16_t)timeout;
Michael J. Spencer 1:f5ac63519541 922 if (dhcp->t1_timeout == 0) {
Michael J. Spencer 1:f5ac63519541 923 dhcp->t1_timeout = 1;
Michael J. Spencer 1:f5ac63519541 924 }
Michael J. Spencer 1:f5ac63519541 925 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
Michael J. Spencer 1:f5ac63519541 926 }
Michael J. Spencer 1:f5ac63519541 927 /* set renewal period timer */
Michael J. Spencer 1:f5ac63519541 928 if (dhcp->offered_t2_rebind != 0xffffffffUL) {
Michael J. Spencer 1:f5ac63519541 929 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
Michael J. Spencer 1:f5ac63519541 930 timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
Michael J. Spencer 1:f5ac63519541 931 if(timeout > 0xffff) {
Michael J. Spencer 1:f5ac63519541 932 timeout = 0xffff;
Michael J. Spencer 1:f5ac63519541 933 }
Michael J. Spencer 1:f5ac63519541 934 dhcp->t2_timeout = (u16_t)timeout;
Michael J. Spencer 1:f5ac63519541 935 if (dhcp->t2_timeout == 0) {
Michael J. Spencer 1:f5ac63519541 936 dhcp->t2_timeout = 1;
Michael J. Spencer 1:f5ac63519541 937 }
Michael J. Spencer 1:f5ac63519541 938 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
Michael J. Spencer 1:f5ac63519541 939 }
Michael J. Spencer 1:f5ac63519541 940
Michael J. Spencer 1:f5ac63519541 941 if (dhcp->subnet_mask_given) {
Michael J. Spencer 1:f5ac63519541 942 /* copy offered network mask */
Michael J. Spencer 1:f5ac63519541 943 ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
Michael J. Spencer 1:f5ac63519541 944 } else {
Michael J. Spencer 1:f5ac63519541 945 /* subnet mask not given, choose a safe subnet mask given the network class */
Michael J. Spencer 1:f5ac63519541 946 u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
Michael J. Spencer 1:f5ac63519541 947 if (first_octet <= 127) {
Michael J. Spencer 1:f5ac63519541 948 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000));
Michael J. Spencer 1:f5ac63519541 949 } else if (first_octet >= 192) {
Michael J. Spencer 1:f5ac63519541 950 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00));
Michael J. Spencer 1:f5ac63519541 951 } else {
Michael J. Spencer 1:f5ac63519541 952 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000));
Michael J. Spencer 1:f5ac63519541 953 }
Michael J. Spencer 1:f5ac63519541 954 }
Michael J. Spencer 1:f5ac63519541 955
Michael J. Spencer 1:f5ac63519541 956 ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
Michael J. Spencer 1:f5ac63519541 957 /* gateway address not given? */
Michael J. Spencer 1:f5ac63519541 958 if (ip_addr_isany(&gw_addr)) {
Michael J. Spencer 1:f5ac63519541 959 /* copy network address */
Michael J. Spencer 1:f5ac63519541 960 ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
Michael J. Spencer 1:f5ac63519541 961 /* use first host address on network as gateway */
Michael J. Spencer 1:f5ac63519541 962 ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001));
Michael J. Spencer 1:f5ac63519541 963 }
Michael J. Spencer 1:f5ac63519541 964
Michael J. Spencer 1:f5ac63519541 965 #if LWIP_DHCP_AUTOIP_COOP
Michael J. Spencer 1:f5ac63519541 966 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
Michael J. Spencer 1:f5ac63519541 967 autoip_stop(netif);
Michael J. Spencer 1:f5ac63519541 968 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
Michael J. Spencer 1:f5ac63519541 969 }
Michael J. Spencer 1:f5ac63519541 970 #endif /* LWIP_DHCP_AUTOIP_COOP */
Michael J. Spencer 1:f5ac63519541 971
Michael J. Spencer 1:f5ac63519541 972 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
Michael J. Spencer 1:f5ac63519541 973 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
Michael J. Spencer 1:f5ac63519541 974 netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
Michael J. Spencer 1:f5ac63519541 975 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
Michael J. Spencer 1:f5ac63519541 976 ip4_addr_get_u32(&sn_mask)));
Michael J. Spencer 1:f5ac63519541 977 netif_set_netmask(netif, &sn_mask);
Michael J. Spencer 1:f5ac63519541 978 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
Michael J. Spencer 1:f5ac63519541 979 ip4_addr_get_u32(&gw_addr)));
Michael J. Spencer 1:f5ac63519541 980 netif_set_gw(netif, &gw_addr);
Michael J. Spencer 1:f5ac63519541 981 /* bring the interface up */
Michael J. Spencer 1:f5ac63519541 982 netif_set_up(netif);
Michael J. Spencer 1:f5ac63519541 983 /* netif is now bound to DHCP leased address */
Michael J. Spencer 1:f5ac63519541 984 dhcp_set_state(dhcp, DHCP_BOUND);
Michael J. Spencer 1:f5ac63519541 985 }
Michael J. Spencer 1:f5ac63519541 986
Michael J. Spencer 1:f5ac63519541 987 /**
Michael J. Spencer 1:f5ac63519541 988 * Renew an existing DHCP lease at the involved DHCP server.
Michael J. Spencer 1:f5ac63519541 989 *
Michael J. Spencer 1:f5ac63519541 990 * @param netif network interface which must renew its lease
Michael J. Spencer 1:f5ac63519541 991 */
Michael J. Spencer 1:f5ac63519541 992 err_t
Michael J. Spencer 1:f5ac63519541 993 dhcp_renew(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 994 {
Michael J. Spencer 1:f5ac63519541 995 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 996 err_t result;
Michael J. Spencer 1:f5ac63519541 997 u16_t msecs;
Michael J. Spencer 1:f5ac63519541 998 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
Michael J. Spencer 1:f5ac63519541 999 dhcp_set_state(dhcp, DHCP_RENEWING);
Michael J. Spencer 1:f5ac63519541 1000
Michael J. Spencer 1:f5ac63519541 1001 /* create and initialize the DHCP message header */
Michael J. Spencer 1:f5ac63519541 1002 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
Michael J. Spencer 1:f5ac63519541 1003 if (result == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 1004 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
Michael J. Spencer 1:f5ac63519541 1005 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
Michael J. Spencer 1:f5ac63519541 1006
Michael J. Spencer 1:f5ac63519541 1007 #if LWIP_NETIF_HOSTNAME
Michael J. Spencer 1:f5ac63519541 1008 if (netif->hostname != NULL) {
Michael J. Spencer 1:f5ac63519541 1009 const char *p = (const char*)netif->hostname;
Michael J. Spencer 1:f5ac63519541 1010 u8_t namelen = (u8_t)strlen(p);
Michael J. Spencer 1:f5ac63519541 1011 if (namelen > 0) {
Michael J. Spencer 1:f5ac63519541 1012 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
Michael J. Spencer 1:f5ac63519541 1013 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
Michael J. Spencer 1:f5ac63519541 1014 while (*p) {
Michael J. Spencer 1:f5ac63519541 1015 dhcp_option_byte(dhcp, *p++);
Michael J. Spencer 1:f5ac63519541 1016 }
Michael J. Spencer 1:f5ac63519541 1017 }
Michael J. Spencer 1:f5ac63519541 1018 }
Michael J. Spencer 1:f5ac63519541 1019 #endif /* LWIP_NETIF_HOSTNAME */
Michael J. Spencer 1:f5ac63519541 1020
Michael J. Spencer 1:f5ac63519541 1021 #if 0
Michael J. Spencer 1:f5ac63519541 1022 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
Michael J. Spencer 1:f5ac63519541 1023 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
Michael J. Spencer 1:f5ac63519541 1024 #endif
Michael J. Spencer 1:f5ac63519541 1025
Michael J. Spencer 1:f5ac63519541 1026 #if 0
Michael J. Spencer 1:f5ac63519541 1027 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
Michael J. Spencer 1:f5ac63519541 1028 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
Michael J. Spencer 1:f5ac63519541 1029 #endif
Michael J. Spencer 1:f5ac63519541 1030 /* append DHCP message trailer */
Michael J. Spencer 1:f5ac63519541 1031 dhcp_option_trailer(dhcp);
Michael J. Spencer 1:f5ac63519541 1032
Michael J. Spencer 1:f5ac63519541 1033 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
Michael J. Spencer 1:f5ac63519541 1034
Michael J. Spencer 1:f5ac63519541 1035 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
Michael J. Spencer 1:f5ac63519541 1036 dhcp_delete_msg(dhcp);
Michael J. Spencer 1:f5ac63519541 1037
Michael J. Spencer 1:f5ac63519541 1038 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
Michael J. Spencer 1:f5ac63519541 1039 } else {
Michael J. Spencer 1:f5ac63519541 1040 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
Michael J. Spencer 1:f5ac63519541 1041 }
Michael J. Spencer 1:f5ac63519541 1042 dhcp->tries++;
Michael J. Spencer 1:f5ac63519541 1043 /* back-off on retries, but to a maximum of 20 seconds */
Michael J. Spencer 1:f5ac63519541 1044 msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
Michael J. Spencer 1:f5ac63519541 1045 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
Michael J. Spencer 1:f5ac63519541 1046 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
Michael J. Spencer 1:f5ac63519541 1047 return result;
Michael J. Spencer 1:f5ac63519541 1048 }
Michael J. Spencer 1:f5ac63519541 1049
Michael J. Spencer 1:f5ac63519541 1050 /**
Michael J. Spencer 1:f5ac63519541 1051 * Rebind with a DHCP server for an existing DHCP lease.
Michael J. Spencer 1:f5ac63519541 1052 *
Michael J. Spencer 1:f5ac63519541 1053 * @param netif network interface which must rebind with a DHCP server
Michael J. Spencer 1:f5ac63519541 1054 */
Michael J. Spencer 1:f5ac63519541 1055 static err_t
Michael J. Spencer 1:f5ac63519541 1056 dhcp_rebind(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 1057 {
Michael J. Spencer 1:f5ac63519541 1058 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 1059 err_t result;
Michael J. Spencer 1:f5ac63519541 1060 u16_t msecs;
Michael J. Spencer 1:f5ac63519541 1061 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
Michael J. Spencer 1:f5ac63519541 1062 dhcp_set_state(dhcp, DHCP_REBINDING);
Michael J. Spencer 1:f5ac63519541 1063
Michael J. Spencer 1:f5ac63519541 1064 /* create and initialize the DHCP message header */
Michael J. Spencer 1:f5ac63519541 1065 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
Michael J. Spencer 1:f5ac63519541 1066 if (result == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 1067 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
Michael J. Spencer 1:f5ac63519541 1068 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
Michael J. Spencer 1:f5ac63519541 1069
Michael J. Spencer 1:f5ac63519541 1070 #if LWIP_NETIF_HOSTNAME
Michael J. Spencer 1:f5ac63519541 1071 if (netif->hostname != NULL) {
Michael J. Spencer 1:f5ac63519541 1072 const char *p = (const char*)netif->hostname;
Michael J. Spencer 1:f5ac63519541 1073 u8_t namelen = (u8_t)strlen(p);
Michael J. Spencer 1:f5ac63519541 1074 if (namelen > 0) {
Michael J. Spencer 1:f5ac63519541 1075 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
Michael J. Spencer 1:f5ac63519541 1076 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
Michael J. Spencer 1:f5ac63519541 1077 while (*p) {
Michael J. Spencer 1:f5ac63519541 1078 dhcp_option_byte(dhcp, *p++);
Michael J. Spencer 1:f5ac63519541 1079 }
Michael J. Spencer 1:f5ac63519541 1080 }
Michael J. Spencer 1:f5ac63519541 1081 }
Michael J. Spencer 1:f5ac63519541 1082 #endif /* LWIP_NETIF_HOSTNAME */
Michael J. Spencer 1:f5ac63519541 1083
Michael J. Spencer 1:f5ac63519541 1084 #if 0
Michael J. Spencer 1:f5ac63519541 1085 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
Michael J. Spencer 1:f5ac63519541 1086 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
Michael J. Spencer 1:f5ac63519541 1087
Michael J. Spencer 1:f5ac63519541 1088 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
Michael J. Spencer 1:f5ac63519541 1089 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
Michael J. Spencer 1:f5ac63519541 1090 #endif
Michael J. Spencer 1:f5ac63519541 1091
Michael J. Spencer 1:f5ac63519541 1092 dhcp_option_trailer(dhcp);
Michael J. Spencer 1:f5ac63519541 1093
Michael J. Spencer 1:f5ac63519541 1094 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
Michael J. Spencer 1:f5ac63519541 1095
Michael J. Spencer 1:f5ac63519541 1096 /* broadcast to server */
Michael J. Spencer 1:f5ac63519541 1097 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
Michael J. Spencer 1:f5ac63519541 1098 dhcp_delete_msg(dhcp);
Michael J. Spencer 1:f5ac63519541 1099 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
Michael J. Spencer 1:f5ac63519541 1100 } else {
Michael J. Spencer 1:f5ac63519541 1101 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
Michael J. Spencer 1:f5ac63519541 1102 }
Michael J. Spencer 1:f5ac63519541 1103 dhcp->tries++;
Michael J. Spencer 1:f5ac63519541 1104 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
Michael J. Spencer 1:f5ac63519541 1105 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
Michael J. Spencer 1:f5ac63519541 1106 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
Michael J. Spencer 1:f5ac63519541 1107 return result;
Michael J. Spencer 1:f5ac63519541 1108 }
Michael J. Spencer 1:f5ac63519541 1109
Michael J. Spencer 1:f5ac63519541 1110 /**
Michael J. Spencer 1:f5ac63519541 1111 * Enter REBOOTING state to verify an existing lease
Michael J. Spencer 1:f5ac63519541 1112 *
Michael J. Spencer 1:f5ac63519541 1113 * @param netif network interface which must reboot
Michael J. Spencer 1:f5ac63519541 1114 */
Michael J. Spencer 1:f5ac63519541 1115 static err_t
Michael J. Spencer 1:f5ac63519541 1116 dhcp_reboot(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 1117 {
Michael J. Spencer 1:f5ac63519541 1118 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 1119 err_t result;
Michael J. Spencer 1:f5ac63519541 1120 u16_t msecs;
Michael J. Spencer 1:f5ac63519541 1121 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
Michael J. Spencer 1:f5ac63519541 1122 dhcp_set_state(dhcp, DHCP_REBOOTING);
Michael J. Spencer 1:f5ac63519541 1123
Michael J. Spencer 1:f5ac63519541 1124 /* create and initialize the DHCP message header */
Michael J. Spencer 1:f5ac63519541 1125 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
Michael J. Spencer 1:f5ac63519541 1126 if (result == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 1127 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
Michael J. Spencer 1:f5ac63519541 1128 dhcp_option_short(dhcp, 576);
Michael J. Spencer 1:f5ac63519541 1129
Michael J. Spencer 1:f5ac63519541 1130 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
Michael J. Spencer 1:f5ac63519541 1131 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
Michael J. Spencer 1:f5ac63519541 1132
Michael J. Spencer 1:f5ac63519541 1133 dhcp_option_trailer(dhcp);
Michael J. Spencer 1:f5ac63519541 1134
Michael J. Spencer 1:f5ac63519541 1135 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
Michael J. Spencer 1:f5ac63519541 1136
Michael J. Spencer 1:f5ac63519541 1137 /* broadcast to server */
Michael J. Spencer 1:f5ac63519541 1138 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
Michael J. Spencer 1:f5ac63519541 1139 dhcp_delete_msg(dhcp);
Michael J. Spencer 1:f5ac63519541 1140 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
Michael J. Spencer 1:f5ac63519541 1141 } else {
Michael J. Spencer 1:f5ac63519541 1142 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
Michael J. Spencer 1:f5ac63519541 1143 }
Michael J. Spencer 1:f5ac63519541 1144 dhcp->tries++;
Michael J. Spencer 1:f5ac63519541 1145 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
Michael J. Spencer 1:f5ac63519541 1146 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
Michael J. Spencer 1:f5ac63519541 1147 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
Michael J. Spencer 1:f5ac63519541 1148 return result;
Michael J. Spencer 1:f5ac63519541 1149 }
Michael J. Spencer 1:f5ac63519541 1150
Michael J. Spencer 1:f5ac63519541 1151
Michael J. Spencer 1:f5ac63519541 1152 /**
Michael J. Spencer 1:f5ac63519541 1153 * Release a DHCP lease.
Michael J. Spencer 1:f5ac63519541 1154 *
Michael J. Spencer 1:f5ac63519541 1155 * @param netif network interface which must release its lease
Michael J. Spencer 1:f5ac63519541 1156 */
Michael J. Spencer 1:f5ac63519541 1157 err_t
Michael J. Spencer 1:f5ac63519541 1158 dhcp_release(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 1159 {
Michael J. Spencer 1:f5ac63519541 1160 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 1161 err_t result;
Michael J. Spencer 1:f5ac63519541 1162 u16_t msecs;
Michael J. Spencer 1:f5ac63519541 1163 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
Michael J. Spencer 1:f5ac63519541 1164
Michael J. Spencer 1:f5ac63519541 1165 /* idle DHCP client */
Michael J. Spencer 1:f5ac63519541 1166 dhcp_set_state(dhcp, DHCP_OFF);
Michael J. Spencer 1:f5ac63519541 1167 /* clean old DHCP offer */
Michael J. Spencer 1:f5ac63519541 1168 ip_addr_set_zero(&dhcp->server_ip_addr);
Michael J. Spencer 1:f5ac63519541 1169 ip_addr_set_zero(&dhcp->offered_ip_addr);
Michael J. Spencer 1:f5ac63519541 1170 ip_addr_set_zero(&dhcp->offered_sn_mask);
Michael J. Spencer 1:f5ac63519541 1171 ip_addr_set_zero(&dhcp->offered_gw_addr);
Michael J. Spencer 1:f5ac63519541 1172 #if LWIP_DHCP_BOOTP_FILE
Michael J. Spencer 1:f5ac63519541 1173 ip_addr_set_zero(&dhcp->offered_si_addr);
Michael J. Spencer 1:f5ac63519541 1174 #endif /* LWIP_DHCP_BOOTP_FILE */
Michael J. Spencer 1:f5ac63519541 1175 dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
Michael J. Spencer 1:f5ac63519541 1176
Michael J. Spencer 1:f5ac63519541 1177 /* create and initialize the DHCP message header */
Michael J. Spencer 1:f5ac63519541 1178 result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
Michael J. Spencer 1:f5ac63519541 1179 if (result == ERR_OK) {
Michael J. Spencer 1:f5ac63519541 1180 dhcp_option_trailer(dhcp);
Michael J. Spencer 1:f5ac63519541 1181
Michael J. Spencer 1:f5ac63519541 1182 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
Michael J. Spencer 1:f5ac63519541 1183
Michael J. Spencer 1:f5ac63519541 1184 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
Michael J. Spencer 1:f5ac63519541 1185 dhcp_delete_msg(dhcp);
Michael J. Spencer 1:f5ac63519541 1186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
Michael J. Spencer 1:f5ac63519541 1187 } else {
Michael J. Spencer 1:f5ac63519541 1188 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
Michael J. Spencer 1:f5ac63519541 1189 }
Michael J. Spencer 1:f5ac63519541 1190 dhcp->tries++;
Michael J. Spencer 1:f5ac63519541 1191 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
Michael J. Spencer 1:f5ac63519541 1192 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
Michael J. Spencer 1:f5ac63519541 1193 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
Michael J. Spencer 1:f5ac63519541 1194 /* bring the interface down */
Michael J. Spencer 1:f5ac63519541 1195 netif_set_down(netif);
Michael J. Spencer 1:f5ac63519541 1196 /* remove IP address from interface */
Michael J. Spencer 1:f5ac63519541 1197 netif_set_ipaddr(netif, IP_ADDR_ANY);
Michael J. Spencer 1:f5ac63519541 1198 netif_set_gw(netif, IP_ADDR_ANY);
Michael J. Spencer 1:f5ac63519541 1199 netif_set_netmask(netif, IP_ADDR_ANY);
Michael J. Spencer 1:f5ac63519541 1200
Michael J. Spencer 1:f5ac63519541 1201 return result;
Michael J. Spencer 1:f5ac63519541 1202 }
Michael J. Spencer 1:f5ac63519541 1203
Michael J. Spencer 1:f5ac63519541 1204 /**
Michael J. Spencer 1:f5ac63519541 1205 * Remove the DHCP client from the interface.
Michael J. Spencer 1:f5ac63519541 1206 *
Michael J. Spencer 1:f5ac63519541 1207 * @param netif The network interface to stop DHCP on
Michael J. Spencer 1:f5ac63519541 1208 */
Michael J. Spencer 1:f5ac63519541 1209 void
Michael J. Spencer 1:f5ac63519541 1210 dhcp_stop(struct netif *netif)
Michael J. Spencer 1:f5ac63519541 1211 {
Michael J. Spencer 1:f5ac63519541 1212 struct dhcp *dhcp;
Michael J. Spencer 1:f5ac63519541 1213 LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
Michael J. Spencer 1:f5ac63519541 1214 dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 1215 /* Remove the flag that says this netif is handled by DHCP. */
Michael J. Spencer 1:f5ac63519541 1216 netif->flags &= ~NETIF_FLAG_DHCP;
Michael J. Spencer 1:f5ac63519541 1217
Michael J. Spencer 1:f5ac63519541 1218 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
Michael J. Spencer 1:f5ac63519541 1219 /* netif is DHCP configured? */
Michael J. Spencer 1:f5ac63519541 1220 if (dhcp != NULL) {
Michael J. Spencer 1:f5ac63519541 1221 #if LWIP_DHCP_AUTOIP_COOP
Michael J. Spencer 1:f5ac63519541 1222 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
Michael J. Spencer 1:f5ac63519541 1223 autoip_stop(netif);
Michael J. Spencer 1:f5ac63519541 1224 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
Michael J. Spencer 1:f5ac63519541 1225 }
Michael J. Spencer 1:f5ac63519541 1226 #endif /* LWIP_DHCP_AUTOIP_COOP */
Michael J. Spencer 1:f5ac63519541 1227
Michael J. Spencer 1:f5ac63519541 1228 if (dhcp->pcb != NULL) {
Michael J. Spencer 1:f5ac63519541 1229 udp_remove(dhcp->pcb);
Michael J. Spencer 1:f5ac63519541 1230 dhcp->pcb = NULL;
Michael J. Spencer 1:f5ac63519541 1231 }
Michael J. Spencer 1:f5ac63519541 1232 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
Michael J. Spencer 1:f5ac63519541 1233 dhcp_set_state(dhcp, DHCP_OFF);
Michael J. Spencer 1:f5ac63519541 1234 }
Michael J. Spencer 1:f5ac63519541 1235 }
Michael J. Spencer 1:f5ac63519541 1236
Michael J. Spencer 1:f5ac63519541 1237 /*
Michael J. Spencer 1:f5ac63519541 1238 * Set the DHCP state of a DHCP client.
Michael J. Spencer 1:f5ac63519541 1239 *
Michael J. Spencer 1:f5ac63519541 1240 * If the state changed, reset the number of tries.
Michael J. Spencer 1:f5ac63519541 1241 */
Michael J. Spencer 1:f5ac63519541 1242 static void
Michael J. Spencer 1:f5ac63519541 1243 dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
Michael J. Spencer 1:f5ac63519541 1244 {
Michael J. Spencer 1:f5ac63519541 1245 if (new_state != dhcp->state) {
Michael J. Spencer 1:f5ac63519541 1246 dhcp->state = new_state;
Michael J. Spencer 1:f5ac63519541 1247 dhcp->tries = 0;
Michael J. Spencer 1:f5ac63519541 1248 dhcp->request_timeout = 0;
Michael J. Spencer 1:f5ac63519541 1249 }
Michael J. Spencer 1:f5ac63519541 1250 }
Michael J. Spencer 1:f5ac63519541 1251
Michael J. Spencer 1:f5ac63519541 1252 /*
Michael J. Spencer 1:f5ac63519541 1253 * Concatenate an option type and length field to the outgoing
Michael J. Spencer 1:f5ac63519541 1254 * DHCP message.
Michael J. Spencer 1:f5ac63519541 1255 *
Michael J. Spencer 1:f5ac63519541 1256 */
Michael J. Spencer 1:f5ac63519541 1257 static void
Michael J. Spencer 1:f5ac63519541 1258 dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
Michael J. Spencer 1:f5ac63519541 1259 {
Michael J. Spencer 1:f5ac63519541 1260 LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
Michael J. Spencer 1:f5ac63519541 1261 dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
Michael J. Spencer 1:f5ac63519541 1262 dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
Michael J. Spencer 1:f5ac63519541 1263 }
Michael J. Spencer 1:f5ac63519541 1264 /*
Michael J. Spencer 1:f5ac63519541 1265 * Concatenate a single byte to the outgoing DHCP message.
Michael J. Spencer 1:f5ac63519541 1266 *
Michael J. Spencer 1:f5ac63519541 1267 */
Michael J. Spencer 1:f5ac63519541 1268 static void
Michael J. Spencer 1:f5ac63519541 1269 dhcp_option_byte(struct dhcp *dhcp, u8_t value)
Michael J. Spencer 1:f5ac63519541 1270 {
Michael J. Spencer 1:f5ac63519541 1271 LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
Michael J. Spencer 1:f5ac63519541 1272 dhcp->msg_out->options[dhcp->options_out_len++] = value;
Michael J. Spencer 1:f5ac63519541 1273 }
Michael J. Spencer 1:f5ac63519541 1274
Michael J. Spencer 1:f5ac63519541 1275 static void
Michael J. Spencer 1:f5ac63519541 1276 dhcp_option_short(struct dhcp *dhcp, u16_t value)
Michael J. Spencer 1:f5ac63519541 1277 {
Michael J. Spencer 1:f5ac63519541 1278 LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
Michael J. Spencer 1:f5ac63519541 1279 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
Michael J. Spencer 1:f5ac63519541 1280 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
Michael J. Spencer 1:f5ac63519541 1281 }
Michael J. Spencer 1:f5ac63519541 1282
Michael J. Spencer 1:f5ac63519541 1283 static void
Michael J. Spencer 1:f5ac63519541 1284 dhcp_option_long(struct dhcp *dhcp, u32_t value)
Michael J. Spencer 1:f5ac63519541 1285 {
Michael J. Spencer 1:f5ac63519541 1286 LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
Michael J. Spencer 1:f5ac63519541 1287 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
Michael J. Spencer 1:f5ac63519541 1288 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
Michael J. Spencer 1:f5ac63519541 1289 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
Michael J. Spencer 1:f5ac63519541 1290 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
Michael J. Spencer 1:f5ac63519541 1291 }
Michael J. Spencer 1:f5ac63519541 1292
Michael J. Spencer 1:f5ac63519541 1293 /**
Michael J. Spencer 1:f5ac63519541 1294 * Extract the DHCP message and the DHCP options.
Michael J. Spencer 1:f5ac63519541 1295 *
Michael J. Spencer 1:f5ac63519541 1296 * Extract the DHCP message and the DHCP options, each into a contiguous
Michael J. Spencer 1:f5ac63519541 1297 * piece of memory. As a DHCP message is variable sized by its options,
Michael J. Spencer 1:f5ac63519541 1298 * and also allows overriding some fields for options, the easy approach
Michael J. Spencer 1:f5ac63519541 1299 * is to first unfold the options into a conitguous piece of memory, and
Michael J. Spencer 1:f5ac63519541 1300 * use that further on.
Michael J. Spencer 1:f5ac63519541 1301 *
Michael J. Spencer 1:f5ac63519541 1302 */
Michael J. Spencer 1:f5ac63519541 1303 static err_t
Michael J. Spencer 1:f5ac63519541 1304 dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
Michael J. Spencer 1:f5ac63519541 1305 {
Michael J. Spencer 1:f5ac63519541 1306 u8_t *options;
Michael J. Spencer 1:f5ac63519541 1307 u16_t offset;
Michael J. Spencer 1:f5ac63519541 1308 u16_t offset_max;
Michael J. Spencer 1:f5ac63519541 1309 u16_t options_idx;
Michael J. Spencer 1:f5ac63519541 1310 u16_t options_idx_max;
Michael J. Spencer 1:f5ac63519541 1311 struct pbuf *q;
Michael J. Spencer 1:f5ac63519541 1312 int parse_file_as_options = 0;
Michael J. Spencer 1:f5ac63519541 1313 int parse_sname_as_options = 0;
Michael J. Spencer 1:f5ac63519541 1314
Michael J. Spencer 1:f5ac63519541 1315 /* clear received options */
Michael J. Spencer 1:f5ac63519541 1316 dhcp_clear_all_options(dhcp);
Michael J. Spencer 1:f5ac63519541 1317 /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
Michael J. Spencer 1:f5ac63519541 1318 if (p->len < DHCP_SNAME_OFS) {
Michael J. Spencer 1:f5ac63519541 1319 return ERR_BUF;
Michael J. Spencer 1:f5ac63519541 1320 }
Michael J. Spencer 1:f5ac63519541 1321 dhcp->msg_in = (struct dhcp_msg *)p->payload;
Michael J. Spencer 1:f5ac63519541 1322 #if LWIP_DHCP_BOOTP_FILE
Michael J. Spencer 1:f5ac63519541 1323 /* clear boot file name */
Michael J. Spencer 1:f5ac63519541 1324 dhcp->boot_file_name[0] = 0;
Michael J. Spencer 1:f5ac63519541 1325 #endif /* LWIP_DHCP_BOOTP_FILE */
Michael J. Spencer 1:f5ac63519541 1326
Michael J. Spencer 1:f5ac63519541 1327 /* parse options */
Michael J. Spencer 1:f5ac63519541 1328
Michael J. Spencer 1:f5ac63519541 1329 /* start with options field */
Michael J. Spencer 1:f5ac63519541 1330 options_idx = DHCP_OPTIONS_OFS;
Michael J. Spencer 1:f5ac63519541 1331 /* parse options to the end of the received packet */
Michael J. Spencer 1:f5ac63519541 1332 options_idx_max = p->tot_len;
Michael J. Spencer 1:f5ac63519541 1333 again:
Michael J. Spencer 1:f5ac63519541 1334 q = p;
Michael J. Spencer 1:f5ac63519541 1335 while((q != NULL) && (options_idx >= q->len)) {
Michael J. Spencer 1:f5ac63519541 1336 options_idx -= q->len;
Michael J. Spencer 1:f5ac63519541 1337 options_idx_max -= q->len;
Michael J. Spencer 1:f5ac63519541 1338 q = q->next;
Michael J. Spencer 1:f5ac63519541 1339 }
Michael J. Spencer 1:f5ac63519541 1340 if (q == NULL) {
Michael J. Spencer 1:f5ac63519541 1341 return ERR_BUF;
Michael J. Spencer 1:f5ac63519541 1342 }
Michael J. Spencer 1:f5ac63519541 1343 offset = options_idx;
Michael J. Spencer 1:f5ac63519541 1344 offset_max = options_idx_max;
Michael J. Spencer 1:f5ac63519541 1345 options = (u8_t*)q->payload;
Michael J. Spencer 1:f5ac63519541 1346 /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
Michael J. Spencer 1:f5ac63519541 1347 while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
Michael J. Spencer 1:f5ac63519541 1348 u8_t op = options[offset];
Michael J. Spencer 1:f5ac63519541 1349 u8_t len;
Michael J. Spencer 1:f5ac63519541 1350 u8_t decode_len = 0;
Michael J. Spencer 1:f5ac63519541 1351 int decode_idx = -1;
Michael J. Spencer 1:f5ac63519541 1352 u16_t val_offset = offset + 2;
Michael J. Spencer 1:f5ac63519541 1353 /* len byte might be in the next pbuf */
Michael J. Spencer 1:f5ac63519541 1354 if (offset + 1 < q->len) {
Michael J. Spencer 1:f5ac63519541 1355 len = options[offset + 1];
Michael J. Spencer 1:f5ac63519541 1356 } else {
Michael J. Spencer 1:f5ac63519541 1357 len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
Michael J. Spencer 1:f5ac63519541 1358 }
Michael J. Spencer 1:f5ac63519541 1359 /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
Michael J. Spencer 1:f5ac63519541 1360 decode_len = len;
Michael J. Spencer 1:f5ac63519541 1361 switch(op) {
Michael J. Spencer 1:f5ac63519541 1362 /* case(DHCP_OPTION_END): handled above */
Michael J. Spencer 1:f5ac63519541 1363 case(DHCP_OPTION_PAD):
Michael J. Spencer 1:f5ac63519541 1364 /* special option: no len encoded */
Michael J. Spencer 1:f5ac63519541 1365 decode_len = len = 0;
Michael J. Spencer 1:f5ac63519541 1366 /* will be increased below */
Michael J. Spencer 1:f5ac63519541 1367 offset--;
Michael J. Spencer 1:f5ac63519541 1368 break;
Michael J. Spencer 1:f5ac63519541 1369 case(DHCP_OPTION_SUBNET_MASK):
Michael J. Spencer 1:f5ac63519541 1370 LWIP_ASSERT("len == 4", len == 4);
Michael J. Spencer 1:f5ac63519541 1371 decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
Michael J. Spencer 1:f5ac63519541 1372 break;
Michael J. Spencer 1:f5ac63519541 1373 case(DHCP_OPTION_ROUTER):
Michael J. Spencer 1:f5ac63519541 1374 decode_len = 4; /* only copy the first given router */
Michael J. Spencer 1:f5ac63519541 1375 LWIP_ASSERT("len >= decode_len", len >= decode_len);
Michael J. Spencer 1:f5ac63519541 1376 decode_idx = DHCP_OPTION_IDX_ROUTER;
Michael J. Spencer 1:f5ac63519541 1377 break;
Michael J. Spencer 1:f5ac63519541 1378 case(DHCP_OPTION_DNS_SERVER):
Michael J. Spencer 1:f5ac63519541 1379 /* special case: there might be more than one server */
Michael J. Spencer 1:f5ac63519541 1380 LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
Michael J. Spencer 1:f5ac63519541 1381 /* limit number of DNS servers */
Michael J. Spencer 1:f5ac63519541 1382 decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
Michael J. Spencer 1:f5ac63519541 1383 LWIP_ASSERT("len >= decode_len", len >= decode_len);
Michael J. Spencer 1:f5ac63519541 1384 decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
Michael J. Spencer 1:f5ac63519541 1385 break;
Michael J. Spencer 1:f5ac63519541 1386 case(DHCP_OPTION_LEASE_TIME):
Michael J. Spencer 1:f5ac63519541 1387 LWIP_ASSERT("len == 4", len == 4);
Michael J. Spencer 1:f5ac63519541 1388 decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
Michael J. Spencer 1:f5ac63519541 1389 break;
Michael J. Spencer 1:f5ac63519541 1390 case(DHCP_OPTION_OVERLOAD):
Michael J. Spencer 1:f5ac63519541 1391 LWIP_ASSERT("len == 1", len == 1);
Michael J. Spencer 1:f5ac63519541 1392 decode_idx = DHCP_OPTION_IDX_OVERLOAD;
Michael J. Spencer 1:f5ac63519541 1393 break;
Michael J. Spencer 1:f5ac63519541 1394 case(DHCP_OPTION_MESSAGE_TYPE):
Michael J. Spencer 1:f5ac63519541 1395 LWIP_ASSERT("len == 1", len == 1);
Michael J. Spencer 1:f5ac63519541 1396 decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
Michael J. Spencer 1:f5ac63519541 1397 break;
Michael J. Spencer 1:f5ac63519541 1398 case(DHCP_OPTION_SERVER_ID):
Michael J. Spencer 1:f5ac63519541 1399 LWIP_ASSERT("len == 4", len == 4);
Michael J. Spencer 1:f5ac63519541 1400 decode_idx = DHCP_OPTION_IDX_SERVER_ID;
Michael J. Spencer 1:f5ac63519541 1401 break;
Michael J. Spencer 1:f5ac63519541 1402 case(DHCP_OPTION_T1):
Michael J. Spencer 1:f5ac63519541 1403 LWIP_ASSERT("len == 4", len == 4);
Michael J. Spencer 1:f5ac63519541 1404 decode_idx = DHCP_OPTION_IDX_T1;
Michael J. Spencer 1:f5ac63519541 1405 break;
Michael J. Spencer 1:f5ac63519541 1406 case(DHCP_OPTION_T2):
Michael J. Spencer 1:f5ac63519541 1407 LWIP_ASSERT("len == 4", len == 4);
Michael J. Spencer 1:f5ac63519541 1408 decode_idx = DHCP_OPTION_IDX_T2;
Michael J. Spencer 1:f5ac63519541 1409 break;
Michael J. Spencer 1:f5ac63519541 1410 default:
Michael J. Spencer 1:f5ac63519541 1411 decode_len = 0;
Michael J. Spencer 1:f5ac63519541 1412 LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
Michael J. Spencer 1:f5ac63519541 1413 break;
Michael J. Spencer 1:f5ac63519541 1414 }
Michael J. Spencer 1:f5ac63519541 1415 offset += len + 2;
Michael J. Spencer 1:f5ac63519541 1416 if (decode_len > 0) {
Michael J. Spencer 1:f5ac63519541 1417 u32_t value = 0;
Michael J. Spencer 1:f5ac63519541 1418 u16_t copy_len;
Michael J. Spencer 1:f5ac63519541 1419 decode_next:
Michael J. Spencer 1:f5ac63519541 1420 LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
Michael J. Spencer 1:f5ac63519541 1421 LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
Michael J. Spencer 1:f5ac63519541 1422 copy_len = LWIP_MIN(decode_len, 4);
Michael J. Spencer 1:f5ac63519541 1423 pbuf_copy_partial(q, &value, copy_len, val_offset);
Michael J. Spencer 1:f5ac63519541 1424 if (decode_len > 4) {
Michael J. Spencer 1:f5ac63519541 1425 /* decode more than one u32_t */
Michael J. Spencer 1:f5ac63519541 1426 LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
Michael J. Spencer 1:f5ac63519541 1427 dhcp_got_option(dhcp, decode_idx);
Michael J. Spencer 1:f5ac63519541 1428 dhcp_set_option_value(dhcp, decode_idx, htonl(value));
Michael J. Spencer 1:f5ac63519541 1429 decode_len -= 4;
Michael J. Spencer 1:f5ac63519541 1430 val_offset += 4;
Michael J. Spencer 1:f5ac63519541 1431 decode_idx++;
Michael J. Spencer 1:f5ac63519541 1432 goto decode_next;
Michael J. Spencer 1:f5ac63519541 1433 } else if (decode_len == 4) {
Michael J. Spencer 1:f5ac63519541 1434 value = ntohl(value);
Michael J. Spencer 1:f5ac63519541 1435 } else {
Michael J. Spencer 1:f5ac63519541 1436 LWIP_ASSERT("invalid decode_len", decode_len == 1);
Michael J. Spencer 1:f5ac63519541 1437 value = ((u8_t*)&value)[0];
Michael J. Spencer 1:f5ac63519541 1438 }
Michael J. Spencer 1:f5ac63519541 1439 dhcp_got_option(dhcp, decode_idx);
Michael J. Spencer 1:f5ac63519541 1440 dhcp_set_option_value(dhcp, decode_idx, value);
Michael J. Spencer 1:f5ac63519541 1441 }
Michael J. Spencer 1:f5ac63519541 1442 if (offset >= q->len) {
Michael J. Spencer 1:f5ac63519541 1443 offset -= q->len;
Michael J. Spencer 1:f5ac63519541 1444 offset_max -= q->len;
Michael J. Spencer 1:f5ac63519541 1445 q = q->next;
Michael J. Spencer 1:f5ac63519541 1446 options = (u8_t*)q->payload;
Michael J. Spencer 1:f5ac63519541 1447 }
Michael J. Spencer 1:f5ac63519541 1448 }
Michael J. Spencer 1:f5ac63519541 1449 /* is this an overloaded message? */
Michael J. Spencer 1:f5ac63519541 1450 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
Michael J. Spencer 1:f5ac63519541 1451 u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
Michael J. Spencer 1:f5ac63519541 1452 dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
Michael J. Spencer 1:f5ac63519541 1453 if (overload == DHCP_OVERLOAD_FILE) {
Michael J. Spencer 1:f5ac63519541 1454 parse_file_as_options = 1;
Michael J. Spencer 1:f5ac63519541 1455 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
Michael J. Spencer 1:f5ac63519541 1456 } else if (overload == DHCP_OVERLOAD_SNAME) {
Michael J. Spencer 1:f5ac63519541 1457 parse_sname_as_options = 1;
Michael J. Spencer 1:f5ac63519541 1458 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
Michael J. Spencer 1:f5ac63519541 1459 } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
Michael J. Spencer 1:f5ac63519541 1460 parse_sname_as_options = 1;
Michael J. Spencer 1:f5ac63519541 1461 parse_file_as_options = 1;
Michael J. Spencer 1:f5ac63519541 1462 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
Michael J. Spencer 1:f5ac63519541 1463 } else {
Michael J. Spencer 1:f5ac63519541 1464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
Michael J. Spencer 1:f5ac63519541 1465 }
Michael J. Spencer 1:f5ac63519541 1466 #if LWIP_DHCP_BOOTP_FILE
Michael J. Spencer 1:f5ac63519541 1467 if (!parse_file_as_options) {
Michael J. Spencer 1:f5ac63519541 1468 /* only do this for ACK messages */
Michael J. Spencer 1:f5ac63519541 1469 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
Michael J. Spencer 1:f5ac63519541 1470 (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
Michael J. Spencer 1:f5ac63519541 1471 /* copy bootp file name, don't care for sname (server hostname) */
Michael J. Spencer 1:f5ac63519541 1472 pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
Michael J. Spencer 1:f5ac63519541 1473 /* make sure the string is really NULL-terminated */
Michael J. Spencer 1:f5ac63519541 1474 dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
Michael J. Spencer 1:f5ac63519541 1475 }
Michael J. Spencer 1:f5ac63519541 1476 #endif /* LWIP_DHCP_BOOTP_FILE */
Michael J. Spencer 1:f5ac63519541 1477 }
Michael J. Spencer 1:f5ac63519541 1478 if (parse_file_as_options) {
Michael J. Spencer 1:f5ac63519541 1479 /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
Michael J. Spencer 1:f5ac63519541 1480 parse_file_as_options = 0;
Michael J. Spencer 1:f5ac63519541 1481 options_idx = DHCP_FILE_OFS;
Michael J. Spencer 1:f5ac63519541 1482 options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
Michael J. Spencer 1:f5ac63519541 1483 goto again;
Michael J. Spencer 1:f5ac63519541 1484 } else if (parse_sname_as_options) {
Michael J. Spencer 1:f5ac63519541 1485 parse_sname_as_options = 0;
Michael J. Spencer 1:f5ac63519541 1486 options_idx = DHCP_SNAME_OFS;
Michael J. Spencer 1:f5ac63519541 1487 options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
Michael J. Spencer 1:f5ac63519541 1488 goto again;
Michael J. Spencer 1:f5ac63519541 1489 }
Michael J. Spencer 1:f5ac63519541 1490 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 1491 }
Michael J. Spencer 1:f5ac63519541 1492
Michael J. Spencer 1:f5ac63519541 1493 /**
Michael J. Spencer 1:f5ac63519541 1494 * If an incoming DHCP message is in response to us, then trigger the state machine
Michael J. Spencer 1:f5ac63519541 1495 */
Michael J. Spencer 1:f5ac63519541 1496 static void
Michael J. Spencer 1:f5ac63519541 1497 dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
Michael J. Spencer 1:f5ac63519541 1498 {
Michael J. Spencer 1:f5ac63519541 1499 struct netif *netif = (struct netif *)arg;
Michael J. Spencer 1:f5ac63519541 1500 struct dhcp *dhcp = netif->dhcp;
Michael J. Spencer 1:f5ac63519541 1501 struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
Michael J. Spencer 1:f5ac63519541 1502 u8_t msg_type;
Michael J. Spencer 1:f5ac63519541 1503 u8_t i;
Michael J. Spencer 1:f5ac63519541 1504 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_recv(pbuf = %p) from DHCP server %"U16_F".%"U16_F".%"U16_F".%"U16_F" port %"U16_F"\n", (void*)p,
Michael J. Spencer 1:f5ac63519541 1505 ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
Michael J. Spencer 1:f5ac63519541 1506 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
Michael J. Spencer 1:f5ac63519541 1507 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
Michael J. Spencer 1:f5ac63519541 1508 /* prevent warnings about unused arguments */
Michael J. Spencer 1:f5ac63519541 1509 LWIP_UNUSED_ARG(pcb);
Michael J. Spencer 1:f5ac63519541 1510 LWIP_UNUSED_ARG(addr);
Michael J. Spencer 1:f5ac63519541 1511 LWIP_UNUSED_ARG(port);
Michael J. Spencer 1:f5ac63519541 1512
Michael J. Spencer 1:f5ac63519541 1513 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
Michael J. Spencer 1:f5ac63519541 1514
Michael J. Spencer 1:f5ac63519541 1515 if (p->len < DHCP_MIN_REPLY_LEN) {
Michael J. Spencer 1:f5ac63519541 1516 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
Michael J. Spencer 1:f5ac63519541 1517 goto free_pbuf_and_return;
Michael J. Spencer 1:f5ac63519541 1518 }
Michael J. Spencer 1:f5ac63519541 1519
Michael J. Spencer 1:f5ac63519541 1520 if (reply_msg->op != DHCP_BOOTREPLY) {
Michael J. Spencer 1:f5ac63519541 1521 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("not a DHCP reply message, but type %"U16_F"\n", (u16_t)reply_msg->op));
Michael J. Spencer 1:f5ac63519541 1522 goto free_pbuf_and_return;
Michael J. Spencer 1:f5ac63519541 1523 }
Michael J. Spencer 1:f5ac63519541 1524 /* iterate through hardware address and match against DHCP message */
Michael J. Spencer 1:f5ac63519541 1525 for (i = 0; i < netif->hwaddr_len; i++) {
Michael J. Spencer 1:f5ac63519541 1526 if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
Michael J. Spencer 1:f5ac63519541 1527 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
Michael J. Spencer 1:f5ac63519541 1528 ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
Michael J. Spencer 1:f5ac63519541 1529 (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
Michael J. Spencer 1:f5ac63519541 1530 goto free_pbuf_and_return;
Michael J. Spencer 1:f5ac63519541 1531 }
Michael J. Spencer 1:f5ac63519541 1532 }
Michael J. Spencer 1:f5ac63519541 1533 /* match transaction ID against what we expected */
Michael J. Spencer 1:f5ac63519541 1534 if (ntohl(reply_msg->xid) != dhcp->xid) {
Michael J. Spencer 1:f5ac63519541 1535 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
Michael J. Spencer 1:f5ac63519541 1536 ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
Michael J. Spencer 1:f5ac63519541 1537 goto free_pbuf_and_return;
Michael J. Spencer 1:f5ac63519541 1538 }
Michael J. Spencer 1:f5ac63519541 1539 /* option fields could be unfold? */
Michael J. Spencer 1:f5ac63519541 1540 if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
Michael J. Spencer 1:f5ac63519541 1541 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
Michael J. Spencer 1:f5ac63519541 1542 ("problem unfolding DHCP message - too short on memory?\n"));
Michael J. Spencer 1:f5ac63519541 1543 goto free_pbuf_and_return;
Michael J. Spencer 1:f5ac63519541 1544 }
Michael J. Spencer 1:f5ac63519541 1545
Michael J. Spencer 1:f5ac63519541 1546 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
Michael J. Spencer 1:f5ac63519541 1547 /* obtain pointer to DHCP message type */
Michael J. Spencer 1:f5ac63519541 1548 if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
Michael J. Spencer 1:f5ac63519541 1549 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
Michael J. Spencer 1:f5ac63519541 1550 goto free_pbuf_and_return;
Michael J. Spencer 1:f5ac63519541 1551 }
Michael J. Spencer 1:f5ac63519541 1552
Michael J. Spencer 1:f5ac63519541 1553 /* read DHCP message type */
Michael J. Spencer 1:f5ac63519541 1554 msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
Michael J. Spencer 1:f5ac63519541 1555 /* message type is DHCP ACK? */
Michael J. Spencer 1:f5ac63519541 1556 if (msg_type == DHCP_ACK) {
Michael J. Spencer 1:f5ac63519541 1557 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
Michael J. Spencer 1:f5ac63519541 1558 /* in requesting state? */
Michael J. Spencer 1:f5ac63519541 1559 if (dhcp->state == DHCP_REQUESTING) {
Michael J. Spencer 1:f5ac63519541 1560 dhcp_handle_ack(netif);
Michael J. Spencer 1:f5ac63519541 1561 #if DHCP_DOES_ARP_CHECK
Michael J. Spencer 1:f5ac63519541 1562 /* check if the acknowledged lease address is already in use */
Michael J. Spencer 1:f5ac63519541 1563 dhcp_check(netif);
Michael J. Spencer 1:f5ac63519541 1564 #else
Michael J. Spencer 1:f5ac63519541 1565 /* bind interface to the acknowledged lease address */
Michael J. Spencer 1:f5ac63519541 1566 dhcp_bind(netif);
Michael J. Spencer 1:f5ac63519541 1567 #endif
Michael J. Spencer 1:f5ac63519541 1568 }
Michael J. Spencer 1:f5ac63519541 1569 /* already bound to the given lease address? */
Michael J. Spencer 1:f5ac63519541 1570 else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
Michael J. Spencer 1:f5ac63519541 1571 dhcp_bind(netif);
Michael J. Spencer 1:f5ac63519541 1572 }
Michael J. Spencer 1:f5ac63519541 1573 }
Michael J. Spencer 1:f5ac63519541 1574 /* received a DHCP_NAK in appropriate state? */
Michael J. Spencer 1:f5ac63519541 1575 else if ((msg_type == DHCP_NAK) &&
Michael J. Spencer 1:f5ac63519541 1576 ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
Michael J. Spencer 1:f5ac63519541 1577 (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
Michael J. Spencer 1:f5ac63519541 1578 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
Michael J. Spencer 1:f5ac63519541 1579 dhcp_handle_nak(netif);
Michael J. Spencer 1:f5ac63519541 1580 }
Michael J. Spencer 1:f5ac63519541 1581 /* received a DHCP_OFFER in DHCP_SELECTING state? */
Michael J. Spencer 1:f5ac63519541 1582 else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
Michael J. Spencer 1:f5ac63519541 1583 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
Michael J. Spencer 1:f5ac63519541 1584 dhcp->request_timeout = 0;
Michael J. Spencer 1:f5ac63519541 1585 /* remember offered lease */
Michael J. Spencer 1:f5ac63519541 1586 dhcp_handle_offer(netif);
Michael J. Spencer 1:f5ac63519541 1587 }
Michael J. Spencer 1:f5ac63519541 1588 free_pbuf_and_return:
Michael J. Spencer 1:f5ac63519541 1589 dhcp->msg_in = NULL;
Michael J. Spencer 1:f5ac63519541 1590 pbuf_free(p);
Michael J. Spencer 1:f5ac63519541 1591 }
Michael J. Spencer 1:f5ac63519541 1592
Michael J. Spencer 1:f5ac63519541 1593 /**
Michael J. Spencer 1:f5ac63519541 1594 * Create a DHCP request, fill in common headers
Michael J. Spencer 1:f5ac63519541 1595 *
Michael J. Spencer 1:f5ac63519541 1596 * @param netif the netif under DHCP control
Michael J. Spencer 1:f5ac63519541 1597 * @param dhcp dhcp control struct
Michael J. Spencer 1:f5ac63519541 1598 * @param message_type message type of the request
Michael J. Spencer 1:f5ac63519541 1599 */
Michael J. Spencer 1:f5ac63519541 1600 static err_t
Michael J. Spencer 1:f5ac63519541 1601 dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
Michael J. Spencer 1:f5ac63519541 1602 {
Michael J. Spencer 1:f5ac63519541 1603 u16_t i;
Michael J. Spencer 1:f5ac63519541 1604 #ifndef DHCP_GLOBAL_XID
Michael J. Spencer 1:f5ac63519541 1605 /** default global transaction identifier starting value (easy to match
Michael J. Spencer 1:f5ac63519541 1606 * with a packet analyser). We simply increment for each new request.
Michael J. Spencer 1:f5ac63519541 1607 * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
Michael J. Spencer 1:f5ac63519541 1608 * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
Michael J. Spencer 1:f5ac63519541 1609 static u32_t xid = 0xABCD0000;
Michael J. Spencer 1:f5ac63519541 1610 #else
Michael J. Spencer 1:f5ac63519541 1611 static u32_t xid;
Michael J. Spencer 1:f5ac63519541 1612 static u8_t xid_initialised = 0;
Michael J. Spencer 1:f5ac63519541 1613 if (!xid_initialised) {
Michael J. Spencer 1:f5ac63519541 1614 xid = DHCP_GLOBAL_XID;
Michael J. Spencer 1:f5ac63519541 1615 xid_initialised = !xid_initialised;
Michael J. Spencer 1:f5ac63519541 1616 }
Michael J. Spencer 1:f5ac63519541 1617 #endif
Michael J. Spencer 1:f5ac63519541 1618 LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
Michael J. Spencer 1:f5ac63519541 1619 LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
Michael J. Spencer 1:f5ac63519541 1620 LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
Michael J. Spencer 1:f5ac63519541 1621 LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
Michael J. Spencer 1:f5ac63519541 1622 dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
Michael J. Spencer 1:f5ac63519541 1623 if (dhcp->p_out == NULL) {
Michael J. Spencer 1:f5ac63519541 1624 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
Michael J. Spencer 1:f5ac63519541 1625 ("dhcp_create_msg(): could not allocate pbuf\n"));
Michael J. Spencer 1:f5ac63519541 1626 return ERR_MEM;
Michael J. Spencer 1:f5ac63519541 1627 }
Michael J. Spencer 1:f5ac63519541 1628 LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
Michael J. Spencer 1:f5ac63519541 1629 (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
Michael J. Spencer 1:f5ac63519541 1630
Michael J. Spencer 1:f5ac63519541 1631 /* reuse transaction identifier in retransmissions */
Michael J. Spencer 1:f5ac63519541 1632 if (dhcp->tries == 0) {
Michael J. Spencer 1:f5ac63519541 1633 xid++;
Michael J. Spencer 1:f5ac63519541 1634 }
Michael J. Spencer 1:f5ac63519541 1635 dhcp->xid = xid;
Michael J. Spencer 1:f5ac63519541 1636 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
Michael J. Spencer 1:f5ac63519541 1637 ("transaction id xid(%"X32_F")\n", xid));
Michael J. Spencer 1:f5ac63519541 1638
Michael J. Spencer 1:f5ac63519541 1639 dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
Michael J. Spencer 1:f5ac63519541 1640
Michael J. Spencer 1:f5ac63519541 1641 dhcp->msg_out->op = DHCP_BOOTREQUEST;
Michael J. Spencer 1:f5ac63519541 1642 /* TODO: make link layer independent */
Michael J. Spencer 1:f5ac63519541 1643 dhcp->msg_out->htype = DHCP_HTYPE_ETH;
Michael J. Spencer 1:f5ac63519541 1644 dhcp->msg_out->hlen = netif->hwaddr_len;
Michael J. Spencer 1:f5ac63519541 1645 dhcp->msg_out->hops = 0;
Michael J. Spencer 1:f5ac63519541 1646 dhcp->msg_out->xid = htonl(dhcp->xid);
Michael J. Spencer 1:f5ac63519541 1647 dhcp->msg_out->secs = 0;
Michael J. Spencer 1:f5ac63519541 1648 /* we don't need the broadcast flag since we can receive unicast traffic
Michael J. Spencer 1:f5ac63519541 1649 before being fully configured! */
Michael J. Spencer 1:f5ac63519541 1650 dhcp->msg_out->flags = 0;
Michael J. Spencer 1:f5ac63519541 1651 ip_addr_set_zero(&dhcp->msg_out->ciaddr);
Michael J. Spencer 1:f5ac63519541 1652 /* set ciaddr to netif->ip_addr based on message_type and state */
Michael J. Spencer 1:f5ac63519541 1653 if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
Michael J. Spencer 1:f5ac63519541 1654 ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
Michael J. Spencer 1:f5ac63519541 1655 ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
Michael J. Spencer 1:f5ac63519541 1656 ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
Michael J. Spencer 1:f5ac63519541 1657 }
Michael J. Spencer 1:f5ac63519541 1658 ip_addr_set_zero(&dhcp->msg_out->yiaddr);
Michael J. Spencer 1:f5ac63519541 1659 ip_addr_set_zero(&dhcp->msg_out->siaddr);
Michael J. Spencer 1:f5ac63519541 1660 ip_addr_set_zero(&dhcp->msg_out->giaddr);
Michael J. Spencer 1:f5ac63519541 1661 for (i = 0; i < DHCP_CHADDR_LEN; i++) {
Michael J. Spencer 1:f5ac63519541 1662 /* copy netif hardware address, pad with zeroes */
Michael J. Spencer 1:f5ac63519541 1663 dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
Michael J. Spencer 1:f5ac63519541 1664 }
Michael J. Spencer 1:f5ac63519541 1665 for (i = 0; i < DHCP_SNAME_LEN; i++) {
Michael J. Spencer 1:f5ac63519541 1666 dhcp->msg_out->sname[i] = 0;
Michael J. Spencer 1:f5ac63519541 1667 }
Michael J. Spencer 1:f5ac63519541 1668 for (i = 0; i < DHCP_FILE_LEN; i++) {
Michael J. Spencer 1:f5ac63519541 1669 dhcp->msg_out->file[i] = 0;
Michael J. Spencer 1:f5ac63519541 1670 }
Michael J. Spencer 1:f5ac63519541 1671 dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
Michael J. Spencer 1:f5ac63519541 1672 dhcp->options_out_len = 0;
Michael J. Spencer 1:f5ac63519541 1673 /* fill options field with an incrementing array (for debugging purposes) */
Michael J. Spencer 1:f5ac63519541 1674 for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
Michael J. Spencer 1:f5ac63519541 1675 dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
Michael J. Spencer 1:f5ac63519541 1676 }
Michael J. Spencer 1:f5ac63519541 1677 /* Add option MESSAGE_TYPE */
Michael J. Spencer 1:f5ac63519541 1678 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
Michael J. Spencer 1:f5ac63519541 1679 dhcp_option_byte(dhcp, message_type);
Michael J. Spencer 1:f5ac63519541 1680 return ERR_OK;
Michael J. Spencer 1:f5ac63519541 1681 }
Michael J. Spencer 1:f5ac63519541 1682
Michael J. Spencer 1:f5ac63519541 1683 /**
Michael J. Spencer 1:f5ac63519541 1684 * Free previously allocated memory used to send a DHCP request.
Michael J. Spencer 1:f5ac63519541 1685 *
Michael J. Spencer 1:f5ac63519541 1686 * @param dhcp the dhcp struct to free the request from
Michael J. Spencer 1:f5ac63519541 1687 */
Michael J. Spencer 1:f5ac63519541 1688 static void
Michael J. Spencer 1:f5ac63519541 1689 dhcp_delete_msg(struct dhcp *dhcp)
Michael J. Spencer 1:f5ac63519541 1690 {
Michael J. Spencer 1:f5ac63519541 1691 LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
Michael J. Spencer 1:f5ac63519541 1692 LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
Michael J. Spencer 1:f5ac63519541 1693 LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
Michael J. Spencer 1:f5ac63519541 1694 if (dhcp->p_out != NULL) {
Michael J. Spencer 1:f5ac63519541 1695 pbuf_free(dhcp->p_out);
Michael J. Spencer 1:f5ac63519541 1696 }
Michael J. Spencer 1:f5ac63519541 1697 dhcp->p_out = NULL;
Michael J. Spencer 1:f5ac63519541 1698 dhcp->msg_out = NULL;
Michael J. Spencer 1:f5ac63519541 1699 }
Michael J. Spencer 1:f5ac63519541 1700
Michael J. Spencer 1:f5ac63519541 1701 /**
Michael J. Spencer 1:f5ac63519541 1702 * Add a DHCP message trailer
Michael J. Spencer 1:f5ac63519541 1703 *
Michael J. Spencer 1:f5ac63519541 1704 * Adds the END option to the DHCP message, and if
Michael J. Spencer 1:f5ac63519541 1705 * necessary, up to three padding bytes.
Michael J. Spencer 1:f5ac63519541 1706 *
Michael J. Spencer 1:f5ac63519541 1707 * @param dhcp DHCP state structure
Michael J. Spencer 1:f5ac63519541 1708 */
Michael J. Spencer 1:f5ac63519541 1709 static void
Michael J. Spencer 1:f5ac63519541 1710 dhcp_option_trailer(struct dhcp *dhcp)
Michael J. Spencer 1:f5ac63519541 1711 {
Michael J. Spencer 1:f5ac63519541 1712 LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
Michael J. Spencer 1:f5ac63519541 1713 LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
Michael J. Spencer 1:f5ac63519541 1714 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
Michael J. Spencer 1:f5ac63519541 1715 dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
Michael J. Spencer 1:f5ac63519541 1716 /* packet is too small, or not 4 byte aligned? */
Michael J. Spencer 1:f5ac63519541 1717 while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
Michael J. Spencer 1:f5ac63519541 1718 /* LWIP_DEBUGF(DHCP_DEBUG,("dhcp_option_trailer:dhcp->options_out_len=%"U16_F", DHCP_OPTIONS_LEN=%"U16_F, dhcp->options_out_len, DHCP_OPTIONS_LEN)); */
Michael J. Spencer 1:f5ac63519541 1719 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
Michael J. Spencer 1:f5ac63519541 1720 /* add a fill/padding byte */
Michael J. Spencer 1:f5ac63519541 1721 dhcp->msg_out->options[dhcp->options_out_len++] = 0;
Michael J. Spencer 1:f5ac63519541 1722 }
Michael J. Spencer 1:f5ac63519541 1723 }
Michael J. Spencer 1:f5ac63519541 1724
Michael J. Spencer 1:f5ac63519541 1725 #endif /* LWIP_DHCP */