Adam Green / EthernetInterface

Deprecated fork of old network stack source from github. Please use official library instead: https://mbed.org/users/mbed_official/code/EthernetInterface/

lwip/core/dhcp.c@1:eadc868c2acf, 2013-10-26 (annotated)

Committer:
AdamGreen
Date:
Sat Oct 26 08:51:36 2013 +0000
Revision:
1:eadc868c2acf
Parent:
0:3b00827bb0b7 
Fix TCP checksum bug and stranded large TCP segments.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AdamGreen 0:3b00827bb0b7 1 /**
AdamGreen 0:3b00827bb0b7 2 * @file
AdamGreen 0:3b00827bb0b7 3 * Dynamic Host Configuration Protocol client
AdamGreen 0:3b00827bb0b7 4 *
AdamGreen 0:3b00827bb0b7 5 */
AdamGreen 0:3b00827bb0b7 6
AdamGreen 0:3b00827bb0b7 7 /*
AdamGreen 0:3b00827bb0b7 8 *
AdamGreen 0:3b00827bb0b7 9 * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
AdamGreen 0:3b00827bb0b7 10 * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
AdamGreen 0:3b00827bb0b7 11 * All rights reserved.
AdamGreen 0:3b00827bb0b7 12 *
AdamGreen 0:3b00827bb0b7 13 * Redistribution and use in source and binary forms, with or without modification,
AdamGreen 0:3b00827bb0b7 14 * are permitted provided that the following conditions are met:
AdamGreen 0:3b00827bb0b7 15 *
AdamGreen 0:3b00827bb0b7 16 * 1. Redistributions of source code must retain the above copyright notice,
AdamGreen 0:3b00827bb0b7 17 * this list of conditions and the following disclaimer.
AdamGreen 0:3b00827bb0b7 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
AdamGreen 0:3b00827bb0b7 19 * this list of conditions and the following disclaimer in the documentation
AdamGreen 0:3b00827bb0b7 20 * and/or other materials provided with the distribution.
AdamGreen 0:3b00827bb0b7 21 * 3. The name of the author may not be used to endorse or promote products
AdamGreen 0:3b00827bb0b7 22 * derived from this software without specific prior written permission.
AdamGreen 0:3b00827bb0b7 23 *
AdamGreen 0:3b00827bb0b7 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
AdamGreen 0:3b00827bb0b7 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
AdamGreen 0:3b00827bb0b7 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
AdamGreen 0:3b00827bb0b7 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
AdamGreen 0:3b00827bb0b7 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
AdamGreen 0:3b00827bb0b7 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
AdamGreen 0:3b00827bb0b7 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
AdamGreen 0:3b00827bb0b7 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
AdamGreen 0:3b00827bb0b7 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
AdamGreen 0:3b00827bb0b7 33 * OF SUCH DAMAGE.
AdamGreen 0:3b00827bb0b7 34 *
AdamGreen 0:3b00827bb0b7 35 * This file is a contribution to the lwIP TCP/IP stack.
AdamGreen 0:3b00827bb0b7 36 * The Swedish Institute of Computer Science and Adam Dunkels
AdamGreen 0:3b00827bb0b7 37 * are specifically granted permission to redistribute this
AdamGreen 0:3b00827bb0b7 38 * source code.
AdamGreen 0:3b00827bb0b7 39 *
AdamGreen 0:3b00827bb0b7 40 * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
AdamGreen 0:3b00827bb0b7 41 *
AdamGreen 0:3b00827bb0b7 42 * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
AdamGreen 0:3b00827bb0b7 43 * with RFC 2131 and RFC 2132.
AdamGreen 0:3b00827bb0b7 44 *
AdamGreen 0:3b00827bb0b7 45 * TODO:
AdamGreen 0:3b00827bb0b7 46 * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
AdamGreen 0:3b00827bb0b7 47 *
AdamGreen 0:3b00827bb0b7 48 * Please coordinate changes and requests with Leon Woestenberg
AdamGreen 0:3b00827bb0b7 49 * <leon.woestenberg@gmx.net>
AdamGreen 0:3b00827bb0b7 50 *
AdamGreen 0:3b00827bb0b7 51 * Integration with your code:
AdamGreen 0:3b00827bb0b7 52 *
AdamGreen 0:3b00827bb0b7 53 * In lwip/dhcp.h
AdamGreen 0:3b00827bb0b7 54 * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
AdamGreen 0:3b00827bb0b7 55 * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
AdamGreen 0:3b00827bb0b7 56 *
AdamGreen 0:3b00827bb0b7 57 * Then have your application call dhcp_coarse_tmr() and
AdamGreen 0:3b00827bb0b7 58 * dhcp_fine_tmr() on the defined intervals.
AdamGreen 0:3b00827bb0b7 59 *
AdamGreen 0:3b00827bb0b7 60 * dhcp_start(struct netif *netif);
AdamGreen 0:3b00827bb0b7 61 * starts a DHCP client instance which configures the interface by
AdamGreen 0:3b00827bb0b7 62 * obtaining an IP address lease and maintaining it.
AdamGreen 0:3b00827bb0b7 63 *
AdamGreen 0:3b00827bb0b7 64 * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
AdamGreen 0:3b00827bb0b7 65 * to remove the DHCP client.
AdamGreen 0:3b00827bb0b7 66 *
AdamGreen 0:3b00827bb0b7 67 */
AdamGreen 0:3b00827bb0b7 68
AdamGreen 0:3b00827bb0b7 69 #include "lwip/opt.h"
AdamGreen 0:3b00827bb0b7 70
AdamGreen 0:3b00827bb0b7 71 #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
AdamGreen 0:3b00827bb0b7 72
AdamGreen 0:3b00827bb0b7 73 #include "lwip/stats.h"
AdamGreen 0:3b00827bb0b7 74 #include "lwip/mem.h"
AdamGreen 0:3b00827bb0b7 75 #include "lwip/udp.h"
AdamGreen 0:3b00827bb0b7 76 #include "lwip/ip_addr.h"
AdamGreen 0:3b00827bb0b7 77 #include "lwip/netif.h"
AdamGreen 0:3b00827bb0b7 78 #include "lwip/def.h"
AdamGreen 0:3b00827bb0b7 79 #include "lwip/sys.h"
AdamGreen 0:3b00827bb0b7 80 #include "lwip/dhcp.h"
AdamGreen 0:3b00827bb0b7 81 #include "lwip/autoip.h"
AdamGreen 0:3b00827bb0b7 82 #include "lwip/dns.h"
AdamGreen 0:3b00827bb0b7 83 #include "netif/etharp.h"
AdamGreen 0:3b00827bb0b7 84
AdamGreen 0:3b00827bb0b7 85 #include <string.h>
AdamGreen 0:3b00827bb0b7 86
AdamGreen 0:3b00827bb0b7 87 /** Default for DHCP_GLOBAL_XID is 0xABCD0000
AdamGreen 0:3b00827bb0b7 88 * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
AdamGreen 0:3b00827bb0b7 89 * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
AdamGreen 0:3b00827bb0b7 90 * #define DHCP_GLOBAL_XID rand()
AdamGreen 0:3b00827bb0b7 91 */
AdamGreen 0:3b00827bb0b7 92 #ifdef DHCP_GLOBAL_XID_HEADER
AdamGreen 0:3b00827bb0b7 93 #include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
AdamGreen 0:3b00827bb0b7 94 #endif
AdamGreen 0:3b00827bb0b7 95
AdamGreen 0:3b00827bb0b7 96 /** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
AdamGreen 0:3b00827bb0b7 97 * MTU is checked to be big enough in dhcp_start */
AdamGreen 0:3b00827bb0b7 98 #define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
AdamGreen 0:3b00827bb0b7 99 #define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
AdamGreen 0:3b00827bb0b7 100 /** Minimum length for reply before packet is parsed */
AdamGreen 0:3b00827bb0b7 101 #define DHCP_MIN_REPLY_LEN 44
AdamGreen 0:3b00827bb0b7 102
AdamGreen 0:3b00827bb0b7 103 #define REBOOT_TRIES 2
AdamGreen 0:3b00827bb0b7 104
AdamGreen 0:3b00827bb0b7 105 /** Option handling: options are parsed in dhcp_parse_reply
AdamGreen 0:3b00827bb0b7 106 * and saved in an array where other functions can load them from.
AdamGreen 0:3b00827bb0b7 107 * This might be moved into the struct dhcp (not necessarily since
AdamGreen 0:3b00827bb0b7 108 * lwIP is single-threaded and the array is only used while in recv
AdamGreen 0:3b00827bb0b7 109 * callback). */
AdamGreen 0:3b00827bb0b7 110 #define DHCP_OPTION_IDX_OVERLOAD 0
AdamGreen 0:3b00827bb0b7 111 #define DHCP_OPTION_IDX_MSG_TYPE 1
AdamGreen 0:3b00827bb0b7 112 #define DHCP_OPTION_IDX_SERVER_ID 2
AdamGreen 0:3b00827bb0b7 113 #define DHCP_OPTION_IDX_LEASE_TIME 3
AdamGreen 0:3b00827bb0b7 114 #define DHCP_OPTION_IDX_T1 4
AdamGreen 0:3b00827bb0b7 115 #define DHCP_OPTION_IDX_T2 5
AdamGreen 0:3b00827bb0b7 116 #define DHCP_OPTION_IDX_SUBNET_MASK 6
AdamGreen 0:3b00827bb0b7 117 #define DHCP_OPTION_IDX_ROUTER 7
AdamGreen 0:3b00827bb0b7 118 #define DHCP_OPTION_IDX_DNS_SERVER 8
AdamGreen 0:3b00827bb0b7 119 #define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
AdamGreen 0:3b00827bb0b7 120
AdamGreen 0:3b00827bb0b7 121 /** Holds the decoded option values, only valid while in dhcp_recv.
AdamGreen 0:3b00827bb0b7 122 @todo: move this into struct dhcp? */
AdamGreen 0:3b00827bb0b7 123 u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
AdamGreen 0:3b00827bb0b7 124 /** Holds a flag which option was received and is contained in dhcp_rx_options_val,
AdamGreen 0:3b00827bb0b7 125 only valid while in dhcp_recv.
AdamGreen 0:3b00827bb0b7 126 @todo: move this into struct dhcp? */
AdamGreen 0:3b00827bb0b7 127 u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
AdamGreen 0:3b00827bb0b7 128
AdamGreen 0:3b00827bb0b7 129 #define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
AdamGreen 0:3b00827bb0b7 130 #define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
AdamGreen 0:3b00827bb0b7 131 #define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
AdamGreen 0:3b00827bb0b7 132 #define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
AdamGreen 0:3b00827bb0b7 133 #define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
AdamGreen 0:3b00827bb0b7 134 #define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
AdamGreen 0:3b00827bb0b7 135
AdamGreen 0:3b00827bb0b7 136
AdamGreen 0:3b00827bb0b7 137 /* DHCP client state machine functions */
AdamGreen 0:3b00827bb0b7 138 static err_t dhcp_discover(struct netif *netif);
AdamGreen 0:3b00827bb0b7 139 static err_t dhcp_select(struct netif *netif);
AdamGreen 0:3b00827bb0b7 140 static void dhcp_bind(struct netif *netif);
AdamGreen 0:3b00827bb0b7 141 #if DHCP_DOES_ARP_CHECK
AdamGreen 0:3b00827bb0b7 142 static err_t dhcp_decline(struct netif *netif);
AdamGreen 0:3b00827bb0b7 143 #endif /* DHCP_DOES_ARP_CHECK */
AdamGreen 0:3b00827bb0b7 144 static err_t dhcp_rebind(struct netif *netif);
AdamGreen 0:3b00827bb0b7 145 static err_t dhcp_reboot(struct netif *netif);
AdamGreen 0:3b00827bb0b7 146 static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
AdamGreen 0:3b00827bb0b7 147
AdamGreen 0:3b00827bb0b7 148 /* receive, unfold, parse and free incoming messages */
AdamGreen 0:3b00827bb0b7 149 static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
AdamGreen 0:3b00827bb0b7 150
AdamGreen 0:3b00827bb0b7 151 /* set the DHCP timers */
AdamGreen 0:3b00827bb0b7 152 static void dhcp_timeout(struct netif *netif);
AdamGreen 0:3b00827bb0b7 153 static void dhcp_t1_timeout(struct netif *netif);
AdamGreen 0:3b00827bb0b7 154 static void dhcp_t2_timeout(struct netif *netif);
AdamGreen 0:3b00827bb0b7 155
AdamGreen 0:3b00827bb0b7 156 /* build outgoing messages */
AdamGreen 0:3b00827bb0b7 157 /* create a DHCP message, fill in common headers */
AdamGreen 0:3b00827bb0b7 158 static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
AdamGreen 0:3b00827bb0b7 159 /* free a DHCP request */
AdamGreen 0:3b00827bb0b7 160 static void dhcp_delete_msg(struct dhcp *dhcp);
AdamGreen 0:3b00827bb0b7 161 /* add a DHCP option (type, then length in bytes) */
AdamGreen 0:3b00827bb0b7 162 static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
AdamGreen 0:3b00827bb0b7 163 /* add option values */
AdamGreen 0:3b00827bb0b7 164 static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
AdamGreen 0:3b00827bb0b7 165 static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
AdamGreen 0:3b00827bb0b7 166 static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
AdamGreen 0:3b00827bb0b7 167 /* always add the DHCP options trailer to end and pad */
AdamGreen 0:3b00827bb0b7 168 static void dhcp_option_trailer(struct dhcp *dhcp);
AdamGreen 0:3b00827bb0b7 169
AdamGreen 0:3b00827bb0b7 170 /**
AdamGreen 0:3b00827bb0b7 171 * Back-off the DHCP client (because of a received NAK response).
AdamGreen 0:3b00827bb0b7 172 *
AdamGreen 0:3b00827bb0b7 173 * Back-off the DHCP client because of a received NAK. Receiving a
AdamGreen 0:3b00827bb0b7 174 * NAK means the client asked for something non-sensible, for
AdamGreen 0:3b00827bb0b7 175 * example when it tries to renew a lease obtained on another network.
AdamGreen 0:3b00827bb0b7 176 *
AdamGreen 0:3b00827bb0b7 177 * We clear any existing set IP address and restart DHCP negotiation
AdamGreen 0:3b00827bb0b7 178 * afresh (as per RFC2131 3.2.3).
AdamGreen 0:3b00827bb0b7 179 *
AdamGreen 0:3b00827bb0b7 180 * @param netif the netif under DHCP control
AdamGreen 0:3b00827bb0b7 181 */
AdamGreen 0:3b00827bb0b7 182 static void
AdamGreen 0:3b00827bb0b7 183 dhcp_handle_nak(struct netif *netif)
AdamGreen 0:3b00827bb0b7 184 {
AdamGreen 0:3b00827bb0b7 185 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
AdamGreen 0:3b00827bb0b7 187 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
AdamGreen 0:3b00827bb0b7 188 /* Set the interface down since the address must no longer be used, as per RFC2131 */
AdamGreen 0:3b00827bb0b7 189 netif_set_down(netif);
AdamGreen 0:3b00827bb0b7 190 /* remove IP address from interface */
AdamGreen 0:3b00827bb0b7 191 netif_set_ipaddr(netif, IP_ADDR_ANY);
AdamGreen 0:3b00827bb0b7 192 netif_set_gw(netif, IP_ADDR_ANY);
AdamGreen 0:3b00827bb0b7 193 netif_set_netmask(netif, IP_ADDR_ANY);
AdamGreen 0:3b00827bb0b7 194 /* Change to a defined state */
AdamGreen 0:3b00827bb0b7 195 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
AdamGreen 0:3b00827bb0b7 196 /* We can immediately restart discovery */
AdamGreen 0:3b00827bb0b7 197 dhcp_discover(netif);
AdamGreen 0:3b00827bb0b7 198 }
AdamGreen 0:3b00827bb0b7 199
AdamGreen 0:3b00827bb0b7 200 #if DHCP_DOES_ARP_CHECK
AdamGreen 0:3b00827bb0b7 201 /**
AdamGreen 0:3b00827bb0b7 202 * Checks if the offered IP address is already in use.
AdamGreen 0:3b00827bb0b7 203 *
AdamGreen 0:3b00827bb0b7 204 * It does so by sending an ARP request for the offered address and
AdamGreen 0:3b00827bb0b7 205 * entering CHECKING state. If no ARP reply is received within a small
AdamGreen 0:3b00827bb0b7 206 * interval, the address is assumed to be free for use by us.
AdamGreen 0:3b00827bb0b7 207 *
AdamGreen 0:3b00827bb0b7 208 * @param netif the netif under DHCP control
AdamGreen 0:3b00827bb0b7 209 */
AdamGreen 0:3b00827bb0b7 210 static void
AdamGreen 0:3b00827bb0b7 211 dhcp_check(struct netif *netif)
AdamGreen 0:3b00827bb0b7 212 {
AdamGreen 0:3b00827bb0b7 213 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 214 err_t result;
AdamGreen 0:3b00827bb0b7 215 u16_t msecs;
AdamGreen 0:3b00827bb0b7 216 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
AdamGreen 0:3b00827bb0b7 217 (s16_t)netif->name[1]));
AdamGreen 0:3b00827bb0b7 218 dhcp_set_state(dhcp, DHCP_CHECKING);
AdamGreen 0:3b00827bb0b7 219 /* create an ARP query for the offered IP address, expecting that no host
AdamGreen 0:3b00827bb0b7 220 responds, as the IP address should not be in use. */
AdamGreen 0:3b00827bb0b7 221 result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
AdamGreen 0:3b00827bb0b7 222 if (result != ERR_OK) {
AdamGreen 0:3b00827bb0b7 223 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
AdamGreen 0:3b00827bb0b7 224 }
AdamGreen 0:3b00827bb0b7 225 dhcp->tries++;
AdamGreen 0:3b00827bb0b7 226 msecs = 500;
AdamGreen 0:3b00827bb0b7 227 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen 0:3b00827bb0b7 228 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen 0:3b00827bb0b7 229 }
AdamGreen 0:3b00827bb0b7 230 #endif /* DHCP_DOES_ARP_CHECK */
AdamGreen 0:3b00827bb0b7 231
AdamGreen 0:3b00827bb0b7 232 /**
AdamGreen 0:3b00827bb0b7 233 * Remember the configuration offered by a DHCP server.
AdamGreen 0:3b00827bb0b7 234 *
AdamGreen 0:3b00827bb0b7 235 * @param netif the netif under DHCP control
AdamGreen 0:3b00827bb0b7 236 */
AdamGreen 0:3b00827bb0b7 237 static void
AdamGreen 0:3b00827bb0b7 238 dhcp_handle_offer(struct netif *netif)
AdamGreen 0:3b00827bb0b7 239 {
AdamGreen 0:3b00827bb0b7 240 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 241 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
AdamGreen 0:3b00827bb0b7 242 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
AdamGreen 0:3b00827bb0b7 243 /* obtain the server address */
AdamGreen 0:3b00827bb0b7 244 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
AdamGreen 0:3b00827bb0b7 245 ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
AdamGreen 0:3b00827bb0b7 246 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
AdamGreen 0:3b00827bb0b7 247 ip4_addr_get_u32(&dhcp->server_ip_addr)));
AdamGreen 0:3b00827bb0b7 248 /* remember offered address */
AdamGreen 0:3b00827bb0b7 249 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
AdamGreen 0:3b00827bb0b7 250 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
AdamGreen 0:3b00827bb0b7 251 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
AdamGreen 0:3b00827bb0b7 252
AdamGreen 0:3b00827bb0b7 253 dhcp_select(netif);
AdamGreen 0:3b00827bb0b7 254 } else {
AdamGreen 0:3b00827bb0b7 255 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
AdamGreen 0:3b00827bb0b7 256 ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
AdamGreen 0:3b00827bb0b7 257 }
AdamGreen 0:3b00827bb0b7 258 }
AdamGreen 0:3b00827bb0b7 259
AdamGreen 0:3b00827bb0b7 260 /**
AdamGreen 0:3b00827bb0b7 261 * Select a DHCP server offer out of all offers.
AdamGreen 0:3b00827bb0b7 262 *
AdamGreen 0:3b00827bb0b7 263 * Simply select the first offer received.
AdamGreen 0:3b00827bb0b7 264 *
AdamGreen 0:3b00827bb0b7 265 * @param netif the netif under DHCP control
AdamGreen 0:3b00827bb0b7 266 * @return lwIP specific error (see error.h)
AdamGreen 0:3b00827bb0b7 267 */
AdamGreen 0:3b00827bb0b7 268 static err_t
AdamGreen 0:3b00827bb0b7 269 dhcp_select(struct netif *netif)
AdamGreen 0:3b00827bb0b7 270 {
AdamGreen 0:3b00827bb0b7 271 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 272 err_t result;
AdamGreen 0:3b00827bb0b7 273 u16_t msecs;
AdamGreen 0:3b00827bb0b7 274
AdamGreen 0:3b00827bb0b7 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));
AdamGreen 0:3b00827bb0b7 276 dhcp_set_state(dhcp, DHCP_REQUESTING);
AdamGreen 0:3b00827bb0b7 277
AdamGreen 0:3b00827bb0b7 278 /* create and initialize the DHCP message header */
AdamGreen 0:3b00827bb0b7 279 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
AdamGreen 0:3b00827bb0b7 280 if (result == ERR_OK) {
AdamGreen 0:3b00827bb0b7 281 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
AdamGreen 0:3b00827bb0b7 282 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
AdamGreen 0:3b00827bb0b7 283
AdamGreen 0:3b00827bb0b7 284 /* MUST request the offered IP address */
AdamGreen 0:3b00827bb0b7 285 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
AdamGreen 0:3b00827bb0b7 286 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
AdamGreen 0:3b00827bb0b7 287
AdamGreen 0:3b00827bb0b7 288 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
AdamGreen 0:3b00827bb0b7 289 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
AdamGreen 0:3b00827bb0b7 290
AdamGreen 0:3b00827bb0b7 291 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
AdamGreen 0:3b00827bb0b7 292 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
AdamGreen 0:3b00827bb0b7 293 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
AdamGreen 0:3b00827bb0b7 294 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
AdamGreen 0:3b00827bb0b7 295 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
AdamGreen 0:3b00827bb0b7 296
AdamGreen 0:3b00827bb0b7 297 #if LWIP_NETIF_HOSTNAME
AdamGreen 0:3b00827bb0b7 298 if (netif->hostname != NULL) {
AdamGreen 0:3b00827bb0b7 299 const char *p = (const char*)netif->hostname;
AdamGreen 0:3b00827bb0b7 300 u8_t namelen = (u8_t)strlen(p);
AdamGreen 0:3b00827bb0b7 301 if (namelen > 0) {
AdamGreen 0:3b00827bb0b7 302 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
AdamGreen 0:3b00827bb0b7 303 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
AdamGreen 0:3b00827bb0b7 304 while (*p) {
AdamGreen 0:3b00827bb0b7 305 dhcp_option_byte(dhcp, *p++);
AdamGreen 0:3b00827bb0b7 306 }
AdamGreen 0:3b00827bb0b7 307 }
AdamGreen 0:3b00827bb0b7 308 }
AdamGreen 0:3b00827bb0b7 309 #endif /* LWIP_NETIF_HOSTNAME */
AdamGreen 0:3b00827bb0b7 310
AdamGreen 0:3b00827bb0b7 311 dhcp_option_trailer(dhcp);
AdamGreen 0:3b00827bb0b7 312 /* shrink the pbuf to the actual content length */
AdamGreen 0:3b00827bb0b7 313 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen 0:3b00827bb0b7 314
AdamGreen 0:3b00827bb0b7 315 /* send broadcast to any DHCP server */
AdamGreen 0:3b00827bb0b7 316 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
AdamGreen 0:3b00827bb0b7 317 dhcp_delete_msg(dhcp);
AdamGreen 0:3b00827bb0b7 318 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
AdamGreen 0:3b00827bb0b7 319 } else {
AdamGreen 0:3b00827bb0b7 320 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
AdamGreen 0:3b00827bb0b7 321 }
AdamGreen 0:3b00827bb0b7 322 dhcp->tries++;
AdamGreen 0:3b00827bb0b7 323 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
AdamGreen 0:3b00827bb0b7 324 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen 0:3b00827bb0b7 325 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen 0:3b00827bb0b7 326 return result;
AdamGreen 0:3b00827bb0b7 327 }
AdamGreen 0:3b00827bb0b7 328
AdamGreen 0:3b00827bb0b7 329 /**
AdamGreen 0:3b00827bb0b7 330 * The DHCP timer that checks for lease renewal/rebind timeouts.
AdamGreen 0:3b00827bb0b7 331 */
AdamGreen 0:3b00827bb0b7 332 void
AdamGreen 0:3b00827bb0b7 333 dhcp_coarse_tmr()
AdamGreen 0:3b00827bb0b7 334 {
AdamGreen 0:3b00827bb0b7 335 struct netif *netif = netif_list;
AdamGreen 0:3b00827bb0b7 336 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
AdamGreen 0:3b00827bb0b7 337 /* iterate through all network interfaces */
AdamGreen 0:3b00827bb0b7 338 while (netif != NULL) {
AdamGreen 0:3b00827bb0b7 339 /* only act on DHCP configured interfaces */
AdamGreen 0:3b00827bb0b7 340 if (netif->dhcp != NULL) {
AdamGreen 0:3b00827bb0b7 341 /* timer is active (non zero), and triggers (zeroes) now? */
AdamGreen 0:3b00827bb0b7 342 if (netif->dhcp->t2_timeout-- == 1) {
AdamGreen 0:3b00827bb0b7 343 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
AdamGreen 0:3b00827bb0b7 344 /* this clients' rebind timeout triggered */
AdamGreen 0:3b00827bb0b7 345 dhcp_t2_timeout(netif);
AdamGreen 0:3b00827bb0b7 346 /* timer is active (non zero), and triggers (zeroes) now */
AdamGreen 0:3b00827bb0b7 347 } else if (netif->dhcp->t1_timeout-- == 1) {
AdamGreen 0:3b00827bb0b7 348 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
AdamGreen 0:3b00827bb0b7 349 /* this clients' renewal timeout triggered */
AdamGreen 0:3b00827bb0b7 350 dhcp_t1_timeout(netif);
AdamGreen 0:3b00827bb0b7 351 }
AdamGreen 0:3b00827bb0b7 352 }
AdamGreen 0:3b00827bb0b7 353 /* proceed to next netif */
AdamGreen 0:3b00827bb0b7 354 netif = netif->next;
AdamGreen 0:3b00827bb0b7 355 }
AdamGreen 0:3b00827bb0b7 356 }
AdamGreen 0:3b00827bb0b7 357
AdamGreen 0:3b00827bb0b7 358 /**
AdamGreen 0:3b00827bb0b7 359 * DHCP transaction timeout handling
AdamGreen 0:3b00827bb0b7 360 *
AdamGreen 0:3b00827bb0b7 361 * A DHCP server is expected to respond within a short period of time.
AdamGreen 0:3b00827bb0b7 362 * This timer checks whether an outstanding DHCP request is timed out.
AdamGreen 0:3b00827bb0b7 363 */
AdamGreen 0:3b00827bb0b7 364 void
AdamGreen 0:3b00827bb0b7 365 dhcp_fine_tmr()
AdamGreen 0:3b00827bb0b7 366 {
AdamGreen 0:3b00827bb0b7 367 struct netif *netif = netif_list;
AdamGreen 0:3b00827bb0b7 368 /* loop through netif's */
AdamGreen 0:3b00827bb0b7 369 while (netif != NULL) {
AdamGreen 0:3b00827bb0b7 370 /* only act on DHCP configured interfaces */
AdamGreen 0:3b00827bb0b7 371 if (netif->dhcp != NULL) {
AdamGreen 0:3b00827bb0b7 372 /* timer is active (non zero), and is about to trigger now */
AdamGreen 0:3b00827bb0b7 373 if (netif->dhcp->request_timeout > 1) {
AdamGreen 0:3b00827bb0b7 374 netif->dhcp->request_timeout--;
AdamGreen 0:3b00827bb0b7 375 }
AdamGreen 0:3b00827bb0b7 376 else if (netif->dhcp->request_timeout == 1) {
AdamGreen 0:3b00827bb0b7 377 netif->dhcp->request_timeout--;
AdamGreen 0:3b00827bb0b7 378 /* { netif->dhcp->request_timeout == 0 } */
AdamGreen 0:3b00827bb0b7 379 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
AdamGreen 0:3b00827bb0b7 380 /* this client's request timeout triggered */
AdamGreen 0:3b00827bb0b7 381 dhcp_timeout(netif);
AdamGreen 0:3b00827bb0b7 382 }
AdamGreen 0:3b00827bb0b7 383 }
AdamGreen 0:3b00827bb0b7 384 /* proceed to next network interface */
AdamGreen 0:3b00827bb0b7 385 netif = netif->next;
AdamGreen 0:3b00827bb0b7 386 }
AdamGreen 0:3b00827bb0b7 387 }
AdamGreen 0:3b00827bb0b7 388
AdamGreen 0:3b00827bb0b7 389 /**
AdamGreen 0:3b00827bb0b7 390 * A DHCP negotiation transaction, or ARP request, has timed out.
AdamGreen 0:3b00827bb0b7 391 *
AdamGreen 0:3b00827bb0b7 392 * The timer that was started with the DHCP or ARP request has
AdamGreen 0:3b00827bb0b7 393 * timed out, indicating no response was received in time.
AdamGreen 0:3b00827bb0b7 394 *
AdamGreen 0:3b00827bb0b7 395 * @param netif the netif under DHCP control
AdamGreen 0:3b00827bb0b7 396 */
AdamGreen 0:3b00827bb0b7 397 static void
AdamGreen 0:3b00827bb0b7 398 dhcp_timeout(struct netif *netif)
AdamGreen 0:3b00827bb0b7 399 {
AdamGreen 0:3b00827bb0b7 400 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 401 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
AdamGreen 0:3b00827bb0b7 402 /* back-off period has passed, or server selection timed out */
AdamGreen 0:3b00827bb0b7 403 if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
AdamGreen 0:3b00827bb0b7 404 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
AdamGreen 0:3b00827bb0b7 405 dhcp_discover(netif);
AdamGreen 0:3b00827bb0b7 406 /* receiving the requested lease timed out */
AdamGreen 0:3b00827bb0b7 407 } else if (dhcp->state == DHCP_REQUESTING) {
AdamGreen 0:3b00827bb0b7 408 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
AdamGreen 0:3b00827bb0b7 409 if (dhcp->tries <= 5) {
AdamGreen 0:3b00827bb0b7 410 dhcp_select(netif);
AdamGreen 0:3b00827bb0b7 411 } else {
AdamGreen 0:3b00827bb0b7 412 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
AdamGreen 0:3b00827bb0b7 413 dhcp_release(netif);
AdamGreen 0:3b00827bb0b7 414 dhcp_discover(netif);
AdamGreen 0:3b00827bb0b7 415 }
AdamGreen 0:3b00827bb0b7 416 #if DHCP_DOES_ARP_CHECK
AdamGreen 0:3b00827bb0b7 417 /* received no ARP reply for the offered address (which is good) */
AdamGreen 0:3b00827bb0b7 418 } else if (dhcp->state == DHCP_CHECKING) {
AdamGreen 0:3b00827bb0b7 419 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
AdamGreen 0:3b00827bb0b7 420 if (dhcp->tries <= 1) {
AdamGreen 0:3b00827bb0b7 421 dhcp_check(netif);
AdamGreen 0:3b00827bb0b7 422 /* no ARP replies on the offered address,
AdamGreen 0:3b00827bb0b7 423 looks like the IP address is indeed free */
AdamGreen 0:3b00827bb0b7 424 } else {
AdamGreen 0:3b00827bb0b7 425 /* bind the interface to the offered address */
AdamGreen 0:3b00827bb0b7 426 dhcp_bind(netif);
AdamGreen 0:3b00827bb0b7 427 }
AdamGreen 0:3b00827bb0b7 428 #endif /* DHCP_DOES_ARP_CHECK */
AdamGreen 0:3b00827bb0b7 429 }
AdamGreen 0:3b00827bb0b7 430 /* did not get response to renew request? */
AdamGreen 0:3b00827bb0b7 431 else if (dhcp->state == DHCP_RENEWING) {
AdamGreen 0:3b00827bb0b7 432 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
AdamGreen 0:3b00827bb0b7 433 /* just retry renewal */
AdamGreen 0:3b00827bb0b7 434 /* note that the rebind timer will eventually time-out if renew does not work */
AdamGreen 0:3b00827bb0b7 435 dhcp_renew(netif);
AdamGreen 0:3b00827bb0b7 436 /* did not get response to rebind request? */
AdamGreen 0:3b00827bb0b7 437 } else if (dhcp->state == DHCP_REBINDING) {
AdamGreen 0:3b00827bb0b7 438 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
AdamGreen 0:3b00827bb0b7 439 if (dhcp->tries <= 8) {
AdamGreen 0:3b00827bb0b7 440 dhcp_rebind(netif);
AdamGreen 0:3b00827bb0b7 441 } else {
AdamGreen 0:3b00827bb0b7 442 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
AdamGreen 0:3b00827bb0b7 443 dhcp_release(netif);
AdamGreen 0:3b00827bb0b7 444 dhcp_discover(netif);
AdamGreen 0:3b00827bb0b7 445 }
AdamGreen 0:3b00827bb0b7 446 } else if (dhcp->state == DHCP_REBOOTING) {
AdamGreen 0:3b00827bb0b7 447 if (dhcp->tries < REBOOT_TRIES) {
AdamGreen 0:3b00827bb0b7 448 dhcp_reboot(netif);
AdamGreen 0:3b00827bb0b7 449 } else {
AdamGreen 0:3b00827bb0b7 450 dhcp_discover(netif);
AdamGreen 0:3b00827bb0b7 451 }
AdamGreen 0:3b00827bb0b7 452 }
AdamGreen 0:3b00827bb0b7 453 }
AdamGreen 0:3b00827bb0b7 454
AdamGreen 0:3b00827bb0b7 455 /**
AdamGreen 0:3b00827bb0b7 456 * The renewal period has timed out.
AdamGreen 0:3b00827bb0b7 457 *
AdamGreen 0:3b00827bb0b7 458 * @param netif the netif under DHCP control
AdamGreen 0:3b00827bb0b7 459 */
AdamGreen 0:3b00827bb0b7 460 static void
AdamGreen 0:3b00827bb0b7 461 dhcp_t1_timeout(struct netif *netif)
AdamGreen 0:3b00827bb0b7 462 {
AdamGreen 0:3b00827bb0b7 463 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
AdamGreen 0:3b00827bb0b7 465 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
AdamGreen 0:3b00827bb0b7 466 (dhcp->state == DHCP_RENEWING)) {
AdamGreen 0:3b00827bb0b7 467 /* just retry to renew - note that the rebind timer (t2) will
AdamGreen 0:3b00827bb0b7 468 * eventually time-out if renew tries fail. */
AdamGreen 0:3b00827bb0b7 469 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
AdamGreen 0:3b00827bb0b7 470 ("dhcp_t1_timeout(): must renew\n"));
AdamGreen 0:3b00827bb0b7 471 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
AdamGreen 0:3b00827bb0b7 472 DHCP_RENEWING, not DHCP_BOUND */
AdamGreen 0:3b00827bb0b7 473 dhcp_renew(netif);
AdamGreen 0:3b00827bb0b7 474 }
AdamGreen 0:3b00827bb0b7 475 }
AdamGreen 0:3b00827bb0b7 476
AdamGreen 0:3b00827bb0b7 477 /**
AdamGreen 0:3b00827bb0b7 478 * The rebind period has timed out.
AdamGreen 0:3b00827bb0b7 479 *
AdamGreen 0:3b00827bb0b7 480 * @param netif the netif under DHCP control
AdamGreen 0:3b00827bb0b7 481 */
AdamGreen 0:3b00827bb0b7 482 static void
AdamGreen 0:3b00827bb0b7 483 dhcp_t2_timeout(struct netif *netif)
AdamGreen 0:3b00827bb0b7 484 {
AdamGreen 0:3b00827bb0b7 485 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 486 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
AdamGreen 0:3b00827bb0b7 487 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
AdamGreen 0:3b00827bb0b7 488 (dhcp->state == DHCP_RENEWING)) {
AdamGreen 0:3b00827bb0b7 489 /* just retry to rebind */
AdamGreen 0:3b00827bb0b7 490 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
AdamGreen 0:3b00827bb0b7 491 ("dhcp_t2_timeout(): must rebind\n"));
AdamGreen 0:3b00827bb0b7 492 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
AdamGreen 0:3b00827bb0b7 493 DHCP_REBINDING, not DHCP_BOUND */
AdamGreen 0:3b00827bb0b7 494 dhcp_rebind(netif);
AdamGreen 0:3b00827bb0b7 495 }
AdamGreen 0:3b00827bb0b7 496 }
AdamGreen 0:3b00827bb0b7 497
AdamGreen 0:3b00827bb0b7 498 /**
AdamGreen 0:3b00827bb0b7 499 * Handle a DHCP ACK packet
AdamGreen 0:3b00827bb0b7 500 *
AdamGreen 0:3b00827bb0b7 501 * @param netif the netif under DHCP control
AdamGreen 0:3b00827bb0b7 502 */
AdamGreen 0:3b00827bb0b7 503 static void
AdamGreen 0:3b00827bb0b7 504 dhcp_handle_ack(struct netif *netif)
AdamGreen 0:3b00827bb0b7 505 {
AdamGreen 0:3b00827bb0b7 506 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 507 #if LWIP_DNS
AdamGreen 0:3b00827bb0b7 508 u8_t n;
AdamGreen 0:3b00827bb0b7 509 #endif /* LWIP_DNS */
AdamGreen 0:3b00827bb0b7 510
AdamGreen 0:3b00827bb0b7 511 /* clear options we might not get from the ACK */
AdamGreen 0:3b00827bb0b7 512 ip_addr_set_zero(&dhcp->offered_sn_mask);
AdamGreen 0:3b00827bb0b7 513 ip_addr_set_zero(&dhcp->offered_gw_addr);
AdamGreen 0:3b00827bb0b7 514 #if LWIP_DHCP_BOOTP_FILE
AdamGreen 0:3b00827bb0b7 515 ip_addr_set_zero(&dhcp->offered_si_addr);
AdamGreen 0:3b00827bb0b7 516 #endif /* LWIP_DHCP_BOOTP_FILE */
AdamGreen 0:3b00827bb0b7 517
AdamGreen 0:3b00827bb0b7 518 /* lease time given? */
AdamGreen 0:3b00827bb0b7 519 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
AdamGreen 0:3b00827bb0b7 520 /* remember offered lease time */
AdamGreen 0:3b00827bb0b7 521 dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
AdamGreen 0:3b00827bb0b7 522 }
AdamGreen 0:3b00827bb0b7 523 /* renewal period given? */
AdamGreen 0:3b00827bb0b7 524 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
AdamGreen 0:3b00827bb0b7 525 /* remember given renewal period */
AdamGreen 0:3b00827bb0b7 526 dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
AdamGreen 0:3b00827bb0b7 527 } else {
AdamGreen 0:3b00827bb0b7 528 /* calculate safe periods for renewal */
AdamGreen 0:3b00827bb0b7 529 dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
AdamGreen 0:3b00827bb0b7 530 }
AdamGreen 0:3b00827bb0b7 531
AdamGreen 0:3b00827bb0b7 532 /* renewal period given? */
AdamGreen 0:3b00827bb0b7 533 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
AdamGreen 0:3b00827bb0b7 534 /* remember given rebind period */
AdamGreen 0:3b00827bb0b7 535 dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
AdamGreen 0:3b00827bb0b7 536 } else {
AdamGreen 0:3b00827bb0b7 537 /* calculate safe periods for rebinding */
AdamGreen 0:3b00827bb0b7 538 dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
AdamGreen 0:3b00827bb0b7 539 }
AdamGreen 0:3b00827bb0b7 540
AdamGreen 0:3b00827bb0b7 541 /* (y)our internet address */
AdamGreen 0:3b00827bb0b7 542 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
AdamGreen 0:3b00827bb0b7 543
AdamGreen 0:3b00827bb0b7 544 #if LWIP_DHCP_BOOTP_FILE
AdamGreen 0:3b00827bb0b7 545 /* copy boot server address,
AdamGreen 0:3b00827bb0b7 546 boot file name copied in dhcp_parse_reply if not overloaded */
AdamGreen 0:3b00827bb0b7 547 ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
AdamGreen 0:3b00827bb0b7 548 #endif /* LWIP_DHCP_BOOTP_FILE */
AdamGreen 0:3b00827bb0b7 549
AdamGreen 0:3b00827bb0b7 550 /* subnet mask given? */
AdamGreen 0:3b00827bb0b7 551 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
AdamGreen 0:3b00827bb0b7 552 /* remember given subnet mask */
AdamGreen 0:3b00827bb0b7 553 ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
AdamGreen 0:3b00827bb0b7 554 dhcp->subnet_mask_given = 1;
AdamGreen 0:3b00827bb0b7 555 } else {
AdamGreen 0:3b00827bb0b7 556 dhcp->subnet_mask_given = 0;
AdamGreen 0:3b00827bb0b7 557 }
AdamGreen 0:3b00827bb0b7 558
AdamGreen 0:3b00827bb0b7 559 /* gateway router */
AdamGreen 0:3b00827bb0b7 560 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
AdamGreen 0:3b00827bb0b7 561 ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
AdamGreen 0:3b00827bb0b7 562 }
AdamGreen 0:3b00827bb0b7 563
AdamGreen 0:3b00827bb0b7 564 #if LWIP_DNS
AdamGreen 0:3b00827bb0b7 565 /* DNS servers */
AdamGreen 0:3b00827bb0b7 566 n = 0;
AdamGreen 0:3b00827bb0b7 567 while((n < DNS_MAX_SERVERS) && dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)) {
AdamGreen 0:3b00827bb0b7 568 ip_addr_t dns_addr;
AdamGreen 0:3b00827bb0b7 569 ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
AdamGreen 0:3b00827bb0b7 570 dns_setserver(n, &dns_addr);
AdamGreen 0:3b00827bb0b7 571 n++;
AdamGreen 0:3b00827bb0b7 572 }
AdamGreen 0:3b00827bb0b7 573 #endif /* LWIP_DNS */
AdamGreen 0:3b00827bb0b7 574 }
AdamGreen 0:3b00827bb0b7 575
AdamGreen 0:3b00827bb0b7 576 /** Set a statically allocated struct dhcp to work with.
AdamGreen 0:3b00827bb0b7 577 * Using this prevents dhcp_start to allocate it using mem_malloc.
AdamGreen 0:3b00827bb0b7 578 *
AdamGreen 0:3b00827bb0b7 579 * @param netif the netif for which to set the struct dhcp
AdamGreen 0:3b00827bb0b7 580 * @param dhcp (uninitialised) dhcp struct allocated by the application
AdamGreen 0:3b00827bb0b7 581 */
AdamGreen 0:3b00827bb0b7 582 void
AdamGreen 0:3b00827bb0b7 583 dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
AdamGreen 0:3b00827bb0b7 584 {
AdamGreen 0:3b00827bb0b7 585 LWIP_ASSERT("netif != NULL", netif != NULL);
AdamGreen 0:3b00827bb0b7 586 LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
AdamGreen 0:3b00827bb0b7 587 LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
AdamGreen 0:3b00827bb0b7 588
AdamGreen 0:3b00827bb0b7 589 /* clear data structure */
AdamGreen 0:3b00827bb0b7 590 memset(dhcp, 0, sizeof(struct dhcp));
AdamGreen 0:3b00827bb0b7 591 /* dhcp_set_state(&dhcp, DHCP_OFF); */
AdamGreen 0:3b00827bb0b7 592 netif->dhcp = dhcp;
AdamGreen 0:3b00827bb0b7 593 }
AdamGreen 0:3b00827bb0b7 594
AdamGreen 0:3b00827bb0b7 595 /** Removes a struct dhcp from a netif.
AdamGreen 0:3b00827bb0b7 596 *
AdamGreen 0:3b00827bb0b7 597 * ATTENTION: Only use this when not using dhcp_set_struct() to allocate the
AdamGreen 0:3b00827bb0b7 598 * struct dhcp since the memory is passed back to the heap.
AdamGreen 0:3b00827bb0b7 599 *
AdamGreen 0:3b00827bb0b7 600 * @param netif the netif from which to remove the struct dhcp
AdamGreen 0:3b00827bb0b7 601 */
AdamGreen 0:3b00827bb0b7 602 void dhcp_cleanup(struct netif *netif)
AdamGreen 0:3b00827bb0b7 603 {
AdamGreen 0:3b00827bb0b7 604 LWIP_ASSERT("netif != NULL", netif != NULL);
AdamGreen 0:3b00827bb0b7 605
AdamGreen 0:3b00827bb0b7 606 if (netif->dhcp != NULL) {
AdamGreen 0:3b00827bb0b7 607 mem_free(netif->dhcp);
AdamGreen 0:3b00827bb0b7 608 netif->dhcp = NULL;
AdamGreen 0:3b00827bb0b7 609 }
AdamGreen 0:3b00827bb0b7 610 }
AdamGreen 0:3b00827bb0b7 611
AdamGreen 0:3b00827bb0b7 612 /**
AdamGreen 0:3b00827bb0b7 613 * Start DHCP negotiation for a network interface.
AdamGreen 0:3b00827bb0b7 614 *
AdamGreen 0:3b00827bb0b7 615 * If no DHCP client instance was attached to this interface,
AdamGreen 0:3b00827bb0b7 616 * a new client is created first. If a DHCP client instance
AdamGreen 0:3b00827bb0b7 617 * was already present, it restarts negotiation.
AdamGreen 0:3b00827bb0b7 618 *
AdamGreen 0:3b00827bb0b7 619 * @param netif The lwIP network interface
AdamGreen 0:3b00827bb0b7 620 * @return lwIP error code
AdamGreen 0:3b00827bb0b7 621 * - ERR_OK - No error
AdamGreen 0:3b00827bb0b7 622 * - ERR_MEM - Out of memory
AdamGreen 0:3b00827bb0b7 623 */
AdamGreen 0:3b00827bb0b7 624 err_t
AdamGreen 0:3b00827bb0b7 625 dhcp_start(struct netif *netif)
AdamGreen 0:3b00827bb0b7 626 {
AdamGreen 0:3b00827bb0b7 627 struct dhcp *dhcp;
AdamGreen 0:3b00827bb0b7 628 err_t result = ERR_OK;
AdamGreen 0:3b00827bb0b7 629
AdamGreen 0:3b00827bb0b7 630 LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
AdamGreen 0:3b00827bb0b7 631 dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 632 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
AdamGreen 0:3b00827bb0b7 633 /* Remove the flag that says this netif is handled by DHCP,
AdamGreen 0:3b00827bb0b7 634 it is set when we succeeded starting. */
AdamGreen 0:3b00827bb0b7 635 netif->flags &= ~NETIF_FLAG_DHCP;
AdamGreen 0:3b00827bb0b7 636
AdamGreen 0:3b00827bb0b7 637 /* check hwtype of the netif */
AdamGreen 0:3b00827bb0b7 638 if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
AdamGreen 0:3b00827bb0b7 639 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
AdamGreen 0:3b00827bb0b7 640 return ERR_ARG;
AdamGreen 0:3b00827bb0b7 641 }
AdamGreen 0:3b00827bb0b7 642
AdamGreen 0:3b00827bb0b7 643 /* check MTU of the netif */
AdamGreen 0:3b00827bb0b7 644 if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
AdamGreen 0:3b00827bb0b7 645 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
AdamGreen 0:3b00827bb0b7 646 return ERR_MEM;
AdamGreen 0:3b00827bb0b7 647 }
AdamGreen 0:3b00827bb0b7 648
AdamGreen 0:3b00827bb0b7 649 /* no DHCP client attached yet? */
AdamGreen 0:3b00827bb0b7 650 if (dhcp == NULL) {
AdamGreen 0:3b00827bb0b7 651 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
AdamGreen 0:3b00827bb0b7 652 dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
AdamGreen 0:3b00827bb0b7 653 if (dhcp == NULL) {
AdamGreen 0:3b00827bb0b7 654 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
AdamGreen 0:3b00827bb0b7 655 return ERR_MEM;
AdamGreen 0:3b00827bb0b7 656 }
AdamGreen 0:3b00827bb0b7 657 /* store this dhcp client in the netif */
AdamGreen 0:3b00827bb0b7 658 netif->dhcp = dhcp;
AdamGreen 0:3b00827bb0b7 659 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
AdamGreen 0:3b00827bb0b7 660 /* already has DHCP client attached */
AdamGreen 0:3b00827bb0b7 661 } else {
AdamGreen 0:3b00827bb0b7 662 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
AdamGreen 0:3b00827bb0b7 663 if (dhcp->pcb != NULL) {
AdamGreen 0:3b00827bb0b7 664 udp_remove(dhcp->pcb);
AdamGreen 0:3b00827bb0b7 665 }
AdamGreen 0:3b00827bb0b7 666 LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
AdamGreen 0:3b00827bb0b7 667 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
AdamGreen 0:3b00827bb0b7 668 }
AdamGreen 0:3b00827bb0b7 669
AdamGreen 0:3b00827bb0b7 670 /* clear data structure */
AdamGreen 0:3b00827bb0b7 671 memset(dhcp, 0, sizeof(struct dhcp));
AdamGreen 0:3b00827bb0b7 672 /* dhcp_set_state(&dhcp, DHCP_OFF); */
AdamGreen 0:3b00827bb0b7 673 /* allocate UDP PCB */
AdamGreen 0:3b00827bb0b7 674 dhcp->pcb = udp_new();
AdamGreen 0:3b00827bb0b7 675 if (dhcp->pcb == NULL) {
AdamGreen 0:3b00827bb0b7 676 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
AdamGreen 0:3b00827bb0b7 677 return ERR_MEM;
AdamGreen 0:3b00827bb0b7 678 }
AdamGreen 0:3b00827bb0b7 679 dhcp->pcb->so_options |= SOF_BROADCAST;
AdamGreen 0:3b00827bb0b7 680 /* set up local and remote port for the pcb */
AdamGreen 0:3b00827bb0b7 681 udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
AdamGreen 0:3b00827bb0b7 682 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
AdamGreen 0:3b00827bb0b7 683 /* set up the recv callback and argument */
AdamGreen 0:3b00827bb0b7 684 udp_recv(dhcp->pcb, dhcp_recv, netif);
AdamGreen 0:3b00827bb0b7 685 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
AdamGreen 0:3b00827bb0b7 686 /* (re)start the DHCP negotiation */
AdamGreen 0:3b00827bb0b7 687 result = dhcp_discover(netif);
AdamGreen 0:3b00827bb0b7 688 if (result != ERR_OK) {
AdamGreen 0:3b00827bb0b7 689 /* free resources allocated above */
AdamGreen 0:3b00827bb0b7 690 dhcp_stop(netif);
AdamGreen 0:3b00827bb0b7 691 return ERR_MEM;
AdamGreen 0:3b00827bb0b7 692 }
AdamGreen 0:3b00827bb0b7 693 /* Set the flag that says this netif is handled by DHCP. */
AdamGreen 0:3b00827bb0b7 694 netif->flags |= NETIF_FLAG_DHCP;
AdamGreen 0:3b00827bb0b7 695 return result;
AdamGreen 0:3b00827bb0b7 696 }
AdamGreen 0:3b00827bb0b7 697
AdamGreen 0:3b00827bb0b7 698 /**
AdamGreen 0:3b00827bb0b7 699 * Inform a DHCP server of our manual configuration.
AdamGreen 0:3b00827bb0b7 700 *
AdamGreen 0:3b00827bb0b7 701 * This informs DHCP servers of our fixed IP address configuration
AdamGreen 0:3b00827bb0b7 702 * by sending an INFORM message. It does not involve DHCP address
AdamGreen 0:3b00827bb0b7 703 * configuration, it is just here to be nice to the network.
AdamGreen 0:3b00827bb0b7 704 *
AdamGreen 0:3b00827bb0b7 705 * @param netif The lwIP network interface
AdamGreen 0:3b00827bb0b7 706 */
AdamGreen 0:3b00827bb0b7 707 void
AdamGreen 0:3b00827bb0b7 708 dhcp_inform(struct netif *netif)
AdamGreen 0:3b00827bb0b7 709 {
AdamGreen 0:3b00827bb0b7 710 struct dhcp dhcp;
AdamGreen 0:3b00827bb0b7 711 err_t result = ERR_OK;
AdamGreen 0:3b00827bb0b7 712 struct udp_pcb *pcb;
AdamGreen 0:3b00827bb0b7 713
AdamGreen 0:3b00827bb0b7 714 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
AdamGreen 0:3b00827bb0b7 715
AdamGreen 0:3b00827bb0b7 716 memset(&dhcp, 0, sizeof(struct dhcp));
AdamGreen 0:3b00827bb0b7 717 dhcp_set_state(&dhcp, DHCP_INFORM);
AdamGreen 0:3b00827bb0b7 718
AdamGreen 0:3b00827bb0b7 719 if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
AdamGreen 0:3b00827bb0b7 720 /* re-use existing pcb */
AdamGreen 0:3b00827bb0b7 721 pcb = netif->dhcp->pcb;
AdamGreen 0:3b00827bb0b7 722 } else {
AdamGreen 0:3b00827bb0b7 723 pcb = udp_new();
AdamGreen 0:3b00827bb0b7 724 if (pcb == NULL) {
AdamGreen 0:3b00827bb0b7 725 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
AdamGreen 0:3b00827bb0b7 726 return;
AdamGreen 0:3b00827bb0b7 727 }
AdamGreen 0:3b00827bb0b7 728 dhcp.pcb = pcb;
AdamGreen 0:3b00827bb0b7 729 dhcp.pcb->so_options |= SOF_BROADCAST;
AdamGreen 0:3b00827bb0b7 730 udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
AdamGreen 0:3b00827bb0b7 731 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
AdamGreen 0:3b00827bb0b7 732 }
AdamGreen 0:3b00827bb0b7 733 /* create and initialize the DHCP message header */
AdamGreen 0:3b00827bb0b7 734 result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
AdamGreen 0:3b00827bb0b7 735 if (result == ERR_OK) {
AdamGreen 0:3b00827bb0b7 736 dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
AdamGreen 0:3b00827bb0b7 737 dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
AdamGreen 0:3b00827bb0b7 738
AdamGreen 0:3b00827bb0b7 739 dhcp_option_trailer(&dhcp);
AdamGreen 0:3b00827bb0b7 740
AdamGreen 0:3b00827bb0b7 741 pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
AdamGreen 0:3b00827bb0b7 742
AdamGreen 0:3b00827bb0b7 743 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
AdamGreen 0:3b00827bb0b7 744 udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
AdamGreen 0:3b00827bb0b7 745 dhcp_delete_msg(&dhcp);
AdamGreen 0:3b00827bb0b7 746 } else {
AdamGreen 0:3b00827bb0b7 747 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
AdamGreen 0:3b00827bb0b7 748 }
AdamGreen 0:3b00827bb0b7 749
AdamGreen 0:3b00827bb0b7 750 if (dhcp.pcb != NULL) {
AdamGreen 0:3b00827bb0b7 751 /* otherwise, the existing pcb was used */
AdamGreen 0:3b00827bb0b7 752 udp_remove(dhcp.pcb);
AdamGreen 0:3b00827bb0b7 753 }
AdamGreen 0:3b00827bb0b7 754 }
AdamGreen 0:3b00827bb0b7 755
AdamGreen 0:3b00827bb0b7 756 /** Handle a possible change in the network configuration.
AdamGreen 0:3b00827bb0b7 757 *
AdamGreen 0:3b00827bb0b7 758 * This enters the REBOOTING state to verify that the currently bound
AdamGreen 0:3b00827bb0b7 759 * address is still valid.
AdamGreen 0:3b00827bb0b7 760 */
AdamGreen 0:3b00827bb0b7 761 void
AdamGreen 0:3b00827bb0b7 762 dhcp_network_changed(struct netif *netif)
AdamGreen 0:3b00827bb0b7 763 {
AdamGreen 0:3b00827bb0b7 764 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 765 if (!dhcp)
AdamGreen 0:3b00827bb0b7 766 return;
AdamGreen 0:3b00827bb0b7 767 switch (dhcp->state) {
AdamGreen 0:3b00827bb0b7 768 case DHCP_REBINDING:
AdamGreen 0:3b00827bb0b7 769 case DHCP_RENEWING:
AdamGreen 0:3b00827bb0b7 770 case DHCP_BOUND:
AdamGreen 0:3b00827bb0b7 771 case DHCP_REBOOTING:
AdamGreen 0:3b00827bb0b7 772 netif_set_down(netif);
AdamGreen 0:3b00827bb0b7 773 dhcp->tries = 0;
AdamGreen 0:3b00827bb0b7 774 dhcp_reboot(netif);
AdamGreen 0:3b00827bb0b7 775 break;
AdamGreen 0:3b00827bb0b7 776 case DHCP_OFF:
AdamGreen 0:3b00827bb0b7 777 /* stay off */
AdamGreen 0:3b00827bb0b7 778 break;
AdamGreen 0:3b00827bb0b7 779 default:
AdamGreen 0:3b00827bb0b7 780 dhcp->tries = 0;
AdamGreen 0:3b00827bb0b7 781 #if LWIP_DHCP_AUTOIP_COOP
AdamGreen 0:3b00827bb0b7 782 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
AdamGreen 0:3b00827bb0b7 783 autoip_stop(netif);
AdamGreen 0:3b00827bb0b7 784 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
AdamGreen 0:3b00827bb0b7 785 }
AdamGreen 0:3b00827bb0b7 786 #endif /* LWIP_DHCP_AUTOIP_COOP */
AdamGreen 0:3b00827bb0b7 787 dhcp_discover(netif);
AdamGreen 0:3b00827bb0b7 788 break;
AdamGreen 0:3b00827bb0b7 789 }
AdamGreen 0:3b00827bb0b7 790 }
AdamGreen 0:3b00827bb0b7 791
AdamGreen 0:3b00827bb0b7 792 #if DHCP_DOES_ARP_CHECK
AdamGreen 0:3b00827bb0b7 793 /**
AdamGreen 0:3b00827bb0b7 794 * Match an ARP reply with the offered IP address.
AdamGreen 0:3b00827bb0b7 795 *
AdamGreen 0:3b00827bb0b7 796 * @param netif the network interface on which the reply was received
AdamGreen 0:3b00827bb0b7 797 * @param addr The IP address we received a reply from
AdamGreen 0:3b00827bb0b7 798 */
AdamGreen 0:3b00827bb0b7 799 void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
AdamGreen 0:3b00827bb0b7 800 {
AdamGreen 0:3b00827bb0b7 801 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
AdamGreen 0:3b00827bb0b7 802 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
AdamGreen 0:3b00827bb0b7 803 /* is a DHCP client doing an ARP check? */
AdamGreen 0:3b00827bb0b7 804 if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
AdamGreen 0:3b00827bb0b7 805 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
AdamGreen 0:3b00827bb0b7 806 ip4_addr_get_u32(addr)));
AdamGreen 0:3b00827bb0b7 807 /* did a host respond with the address we
AdamGreen 0:3b00827bb0b7 808 were offered by the DHCP server? */
AdamGreen 0:3b00827bb0b7 809 if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
AdamGreen 0:3b00827bb0b7 810 /* we will not accept the offered address */
AdamGreen 0:3b00827bb0b7 811 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
AdamGreen 0:3b00827bb0b7 812 ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
AdamGreen 0:3b00827bb0b7 813 dhcp_decline(netif);
AdamGreen 0:3b00827bb0b7 814 }
AdamGreen 0:3b00827bb0b7 815 }
AdamGreen 0:3b00827bb0b7 816 }
AdamGreen 0:3b00827bb0b7 817
AdamGreen 0:3b00827bb0b7 818 /**
AdamGreen 0:3b00827bb0b7 819 * Decline an offered lease.
AdamGreen 0:3b00827bb0b7 820 *
AdamGreen 0:3b00827bb0b7 821 * Tell the DHCP server we do not accept the offered address.
AdamGreen 0:3b00827bb0b7 822 * One reason to decline the lease is when we find out the address
AdamGreen 0:3b00827bb0b7 823 * is already in use by another host (through ARP).
AdamGreen 0:3b00827bb0b7 824 *
AdamGreen 0:3b00827bb0b7 825 * @param netif the netif under DHCP control
AdamGreen 0:3b00827bb0b7 826 */
AdamGreen 0:3b00827bb0b7 827 static err_t
AdamGreen 0:3b00827bb0b7 828 dhcp_decline(struct netif *netif)
AdamGreen 0:3b00827bb0b7 829 {
AdamGreen 0:3b00827bb0b7 830 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 831 err_t result = ERR_OK;
AdamGreen 0:3b00827bb0b7 832 u16_t msecs;
AdamGreen 0:3b00827bb0b7 833 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
AdamGreen 0:3b00827bb0b7 834 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
AdamGreen 0:3b00827bb0b7 835 /* create and initialize the DHCP message header */
AdamGreen 0:3b00827bb0b7 836 result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
AdamGreen 0:3b00827bb0b7 837 if (result == ERR_OK) {
AdamGreen 0:3b00827bb0b7 838 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
AdamGreen 0:3b00827bb0b7 839 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
AdamGreen 0:3b00827bb0b7 840
AdamGreen 0:3b00827bb0b7 841 dhcp_option_trailer(dhcp);
AdamGreen 0:3b00827bb0b7 842 /* resize pbuf to reflect true size of options */
AdamGreen 0:3b00827bb0b7 843 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen 0:3b00827bb0b7 844
AdamGreen 0:3b00827bb0b7 845 /* per section 4.4.4, broadcast DECLINE messages */
AdamGreen 0:3b00827bb0b7 846 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
AdamGreen 0:3b00827bb0b7 847 dhcp_delete_msg(dhcp);
AdamGreen 0:3b00827bb0b7 848 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
AdamGreen 0:3b00827bb0b7 849 } else {
AdamGreen 0:3b00827bb0b7 850 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
AdamGreen 0:3b00827bb0b7 851 ("dhcp_decline: could not allocate DHCP request\n"));
AdamGreen 0:3b00827bb0b7 852 }
AdamGreen 0:3b00827bb0b7 853 dhcp->tries++;
AdamGreen 0:3b00827bb0b7 854 msecs = 10*1000;
AdamGreen 0:3b00827bb0b7 855 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen 0:3b00827bb0b7 856 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen 0:3b00827bb0b7 857 return result;
AdamGreen 0:3b00827bb0b7 858 }
AdamGreen 0:3b00827bb0b7 859 #endif /* DHCP_DOES_ARP_CHECK */
AdamGreen 0:3b00827bb0b7 860
AdamGreen 0:3b00827bb0b7 861
AdamGreen 0:3b00827bb0b7 862 /**
AdamGreen 0:3b00827bb0b7 863 * Start the DHCP process, discover a DHCP server.
AdamGreen 0:3b00827bb0b7 864 *
AdamGreen 0:3b00827bb0b7 865 * @param netif the netif under DHCP control
AdamGreen 0:3b00827bb0b7 866 */
AdamGreen 0:3b00827bb0b7 867 static err_t
AdamGreen 0:3b00827bb0b7 868 dhcp_discover(struct netif *netif)
AdamGreen 0:3b00827bb0b7 869 {
AdamGreen 0:3b00827bb0b7 870 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 871 err_t result = ERR_OK;
AdamGreen 0:3b00827bb0b7 872 u16_t msecs;
AdamGreen 0:3b00827bb0b7 873 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
AdamGreen 0:3b00827bb0b7 874 ip_addr_set_any(&dhcp->offered_ip_addr);
AdamGreen 0:3b00827bb0b7 875 dhcp_set_state(dhcp, DHCP_SELECTING);
AdamGreen 0:3b00827bb0b7 876 /* create and initialize the DHCP message header */
AdamGreen 0:3b00827bb0b7 877 result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
AdamGreen 0:3b00827bb0b7 878 if (result == ERR_OK) {
AdamGreen 0:3b00827bb0b7 879 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
AdamGreen 0:3b00827bb0b7 880
AdamGreen 0:3b00827bb0b7 881 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
AdamGreen 0:3b00827bb0b7 882 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
AdamGreen 0:3b00827bb0b7 883
AdamGreen 0:3b00827bb0b7 884 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
AdamGreen 0:3b00827bb0b7 885 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
AdamGreen 0:3b00827bb0b7 886 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
AdamGreen 0:3b00827bb0b7 887 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
AdamGreen 0:3b00827bb0b7 888 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
AdamGreen 0:3b00827bb0b7 889
AdamGreen 0:3b00827bb0b7 890 dhcp_option_trailer(dhcp);
AdamGreen 0:3b00827bb0b7 891
AdamGreen 0:3b00827bb0b7 892 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
AdamGreen 0:3b00827bb0b7 893 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen 0:3b00827bb0b7 894
AdamGreen 0:3b00827bb0b7 895 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
AdamGreen 0:3b00827bb0b7 896 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
AdamGreen 0:3b00827bb0b7 897 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
AdamGreen 0:3b00827bb0b7 898 dhcp_delete_msg(dhcp);
AdamGreen 0:3b00827bb0b7 899 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
AdamGreen 0:3b00827bb0b7 900 } else {
AdamGreen 0:3b00827bb0b7 901 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
AdamGreen 0:3b00827bb0b7 902 }
AdamGreen 0:3b00827bb0b7 903 dhcp->tries++;
AdamGreen 0:3b00827bb0b7 904 #if LWIP_DHCP_AUTOIP_COOP
AdamGreen 0:3b00827bb0b7 905 if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
AdamGreen 0:3b00827bb0b7 906 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
AdamGreen 0:3b00827bb0b7 907 autoip_start(netif);
AdamGreen 0:3b00827bb0b7 908 }
AdamGreen 0:3b00827bb0b7 909 #endif /* LWIP_DHCP_AUTOIP_COOP */
AdamGreen 0:3b00827bb0b7 910 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
AdamGreen 0:3b00827bb0b7 911 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen 0:3b00827bb0b7 912 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen 0:3b00827bb0b7 913 return result;
AdamGreen 0:3b00827bb0b7 914 }
AdamGreen 0:3b00827bb0b7 915
AdamGreen 0:3b00827bb0b7 916
AdamGreen 0:3b00827bb0b7 917 /**
AdamGreen 0:3b00827bb0b7 918 * Bind the interface to the offered IP address.
AdamGreen 0:3b00827bb0b7 919 *
AdamGreen 0:3b00827bb0b7 920 * @param netif network interface to bind to the offered address
AdamGreen 0:3b00827bb0b7 921 */
AdamGreen 0:3b00827bb0b7 922 static void
AdamGreen 0:3b00827bb0b7 923 dhcp_bind(struct netif *netif)
AdamGreen 0:3b00827bb0b7 924 {
AdamGreen 0:3b00827bb0b7 925 u32_t timeout;
AdamGreen 0:3b00827bb0b7 926 struct dhcp *dhcp;
AdamGreen 0:3b00827bb0b7 927 ip_addr_t sn_mask, gw_addr;
AdamGreen 0:3b00827bb0b7 928 LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
AdamGreen 0:3b00827bb0b7 929 dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 930 LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
AdamGreen 0:3b00827bb0b7 931 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
AdamGreen 0:3b00827bb0b7 932
AdamGreen 0:3b00827bb0b7 933 /* temporary DHCP lease? */
AdamGreen 0:3b00827bb0b7 934 if (dhcp->offered_t1_renew != 0xffffffffUL) {
AdamGreen 0:3b00827bb0b7 935 /* set renewal period timer */
AdamGreen 0:3b00827bb0b7 936 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
AdamGreen 0:3b00827bb0b7 937 timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
AdamGreen 0:3b00827bb0b7 938 if(timeout > 0xffff) {
AdamGreen 0:3b00827bb0b7 939 timeout = 0xffff;
AdamGreen 0:3b00827bb0b7 940 }
AdamGreen 0:3b00827bb0b7 941 dhcp->t1_timeout = (u16_t)timeout;
AdamGreen 0:3b00827bb0b7 942 if (dhcp->t1_timeout == 0) {
AdamGreen 0:3b00827bb0b7 943 dhcp->t1_timeout = 1;
AdamGreen 0:3b00827bb0b7 944 }
AdamGreen 0:3b00827bb0b7 945 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
AdamGreen 0:3b00827bb0b7 946 }
AdamGreen 0:3b00827bb0b7 947 /* set renewal period timer */
AdamGreen 0:3b00827bb0b7 948 if (dhcp->offered_t2_rebind != 0xffffffffUL) {
AdamGreen 0:3b00827bb0b7 949 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
AdamGreen 0:3b00827bb0b7 950 timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
AdamGreen 0:3b00827bb0b7 951 if(timeout > 0xffff) {
AdamGreen 0:3b00827bb0b7 952 timeout = 0xffff;
AdamGreen 0:3b00827bb0b7 953 }
AdamGreen 0:3b00827bb0b7 954 dhcp->t2_timeout = (u16_t)timeout;
AdamGreen 0:3b00827bb0b7 955 if (dhcp->t2_timeout == 0) {
AdamGreen 0:3b00827bb0b7 956 dhcp->t2_timeout = 1;
AdamGreen 0:3b00827bb0b7 957 }
AdamGreen 0:3b00827bb0b7 958 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
AdamGreen 0:3b00827bb0b7 959 }
AdamGreen 0:3b00827bb0b7 960
AdamGreen 0:3b00827bb0b7 961 if (dhcp->subnet_mask_given) {
AdamGreen 0:3b00827bb0b7 962 /* copy offered network mask */
AdamGreen 0:3b00827bb0b7 963 ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
AdamGreen 0:3b00827bb0b7 964 } else {
AdamGreen 0:3b00827bb0b7 965 /* subnet mask not given, choose a safe subnet mask given the network class */
AdamGreen 0:3b00827bb0b7 966 u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
AdamGreen 0:3b00827bb0b7 967 if (first_octet <= 127) {
AdamGreen 0:3b00827bb0b7 968 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000UL));
AdamGreen 0:3b00827bb0b7 969 } else if (first_octet >= 192) {
AdamGreen 0:3b00827bb0b7 970 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00UL));
AdamGreen 0:3b00827bb0b7 971 } else {
AdamGreen 0:3b00827bb0b7 972 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000UL));
AdamGreen 0:3b00827bb0b7 973 }
AdamGreen 0:3b00827bb0b7 974 }
AdamGreen 0:3b00827bb0b7 975
AdamGreen 0:3b00827bb0b7 976 ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
AdamGreen 0:3b00827bb0b7 977 /* gateway address not given? */
AdamGreen 0:3b00827bb0b7 978 if (gw_addr.addr == IPADDR_ANY) {
AdamGreen 0:3b00827bb0b7 979 /* copy network address */
AdamGreen 0:3b00827bb0b7 980 ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
AdamGreen 0:3b00827bb0b7 981 /* use first host address on network as gateway */
AdamGreen 0:3b00827bb0b7 982 ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001UL));
AdamGreen 0:3b00827bb0b7 983 }
AdamGreen 0:3b00827bb0b7 984
AdamGreen 0:3b00827bb0b7 985 #if LWIP_DHCP_AUTOIP_COOP
AdamGreen 0:3b00827bb0b7 986 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
AdamGreen 0:3b00827bb0b7 987 autoip_stop(netif);
AdamGreen 0:3b00827bb0b7 988 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
AdamGreen 0:3b00827bb0b7 989 }
AdamGreen 0:3b00827bb0b7 990 #endif /* LWIP_DHCP_AUTOIP_COOP */
AdamGreen 0:3b00827bb0b7 991
AdamGreen 0:3b00827bb0b7 992 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
AdamGreen 0:3b00827bb0b7 993 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
AdamGreen 0:3b00827bb0b7 994 netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
AdamGreen 0:3b00827bb0b7 995 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
AdamGreen 0:3b00827bb0b7 996 ip4_addr_get_u32(&sn_mask)));
AdamGreen 0:3b00827bb0b7 997 netif_set_netmask(netif, &sn_mask);
AdamGreen 0:3b00827bb0b7 998 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
AdamGreen 0:3b00827bb0b7 999 ip4_addr_get_u32(&gw_addr)));
AdamGreen 0:3b00827bb0b7 1000 netif_set_gw(netif, &gw_addr);
AdamGreen 0:3b00827bb0b7 1001 /* bring the interface up */
AdamGreen 0:3b00827bb0b7 1002 netif_set_up(netif);
AdamGreen 0:3b00827bb0b7 1003 /* netif is now bound to DHCP leased address */
AdamGreen 0:3b00827bb0b7 1004 dhcp_set_state(dhcp, DHCP_BOUND);
AdamGreen 0:3b00827bb0b7 1005 }
AdamGreen 0:3b00827bb0b7 1006
AdamGreen 0:3b00827bb0b7 1007 /**
AdamGreen 0:3b00827bb0b7 1008 * Renew an existing DHCP lease at the involved DHCP server.
AdamGreen 0:3b00827bb0b7 1009 *
AdamGreen 0:3b00827bb0b7 1010 * @param netif network interface which must renew its lease
AdamGreen 0:3b00827bb0b7 1011 */
AdamGreen 0:3b00827bb0b7 1012 err_t
AdamGreen 0:3b00827bb0b7 1013 dhcp_renew(struct netif *netif)
AdamGreen 0:3b00827bb0b7 1014 {
AdamGreen 0:3b00827bb0b7 1015 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 1016 err_t result;
AdamGreen 0:3b00827bb0b7 1017 u16_t msecs;
AdamGreen 0:3b00827bb0b7 1018 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
AdamGreen 0:3b00827bb0b7 1019 dhcp_set_state(dhcp, DHCP_RENEWING);
AdamGreen 0:3b00827bb0b7 1020
AdamGreen 0:3b00827bb0b7 1021 /* create and initialize the DHCP message header */
AdamGreen 0:3b00827bb0b7 1022 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
AdamGreen 0:3b00827bb0b7 1023 if (result == ERR_OK) {
AdamGreen 0:3b00827bb0b7 1024 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
AdamGreen 0:3b00827bb0b7 1025 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
AdamGreen 0:3b00827bb0b7 1026
AdamGreen 0:3b00827bb0b7 1027 #if LWIP_NETIF_HOSTNAME
AdamGreen 0:3b00827bb0b7 1028 if (netif->hostname != NULL) {
AdamGreen 0:3b00827bb0b7 1029 const char *p = (const char*)netif->hostname;
AdamGreen 0:3b00827bb0b7 1030 u8_t namelen = (u8_t)strlen(p);
AdamGreen 0:3b00827bb0b7 1031 if (namelen > 0) {
AdamGreen 0:3b00827bb0b7 1032 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
AdamGreen 0:3b00827bb0b7 1033 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
AdamGreen 0:3b00827bb0b7 1034 while (*p) {
AdamGreen 0:3b00827bb0b7 1035 dhcp_option_byte(dhcp, *p++);
AdamGreen 0:3b00827bb0b7 1036 }
AdamGreen 0:3b00827bb0b7 1037 }
AdamGreen 0:3b00827bb0b7 1038 }
AdamGreen 0:3b00827bb0b7 1039 #endif /* LWIP_NETIF_HOSTNAME */
AdamGreen 0:3b00827bb0b7 1040
AdamGreen 0:3b00827bb0b7 1041 #if 0
AdamGreen 0:3b00827bb0b7 1042 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
AdamGreen 0:3b00827bb0b7 1043 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
AdamGreen 0:3b00827bb0b7 1044 #endif
AdamGreen 0:3b00827bb0b7 1045
AdamGreen 0:3b00827bb0b7 1046 #if 0
AdamGreen 0:3b00827bb0b7 1047 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
AdamGreen 0:3b00827bb0b7 1048 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
AdamGreen 0:3b00827bb0b7 1049 #endif
AdamGreen 0:3b00827bb0b7 1050 /* append DHCP message trailer */
AdamGreen 0:3b00827bb0b7 1051 dhcp_option_trailer(dhcp);
AdamGreen 0:3b00827bb0b7 1052
AdamGreen 0:3b00827bb0b7 1053 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen 0:3b00827bb0b7 1054
AdamGreen 0:3b00827bb0b7 1055 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
AdamGreen 0:3b00827bb0b7 1056 dhcp_delete_msg(dhcp);
AdamGreen 0:3b00827bb0b7 1057
AdamGreen 0:3b00827bb0b7 1058 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
AdamGreen 0:3b00827bb0b7 1059 } else {
AdamGreen 0:3b00827bb0b7 1060 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
AdamGreen 0:3b00827bb0b7 1061 }
AdamGreen 0:3b00827bb0b7 1062 dhcp->tries++;
AdamGreen 0:3b00827bb0b7 1063 /* back-off on retries, but to a maximum of 20 seconds */
AdamGreen 0:3b00827bb0b7 1064 msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
AdamGreen 0:3b00827bb0b7 1065 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen 0:3b00827bb0b7 1066 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen 0:3b00827bb0b7 1067 return result;
AdamGreen 0:3b00827bb0b7 1068 }
AdamGreen 0:3b00827bb0b7 1069
AdamGreen 0:3b00827bb0b7 1070 /**
AdamGreen 0:3b00827bb0b7 1071 * Rebind with a DHCP server for an existing DHCP lease.
AdamGreen 0:3b00827bb0b7 1072 *
AdamGreen 0:3b00827bb0b7 1073 * @param netif network interface which must rebind with a DHCP server
AdamGreen 0:3b00827bb0b7 1074 */
AdamGreen 0:3b00827bb0b7 1075 static err_t
AdamGreen 0:3b00827bb0b7 1076 dhcp_rebind(struct netif *netif)
AdamGreen 0:3b00827bb0b7 1077 {
AdamGreen 0:3b00827bb0b7 1078 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 1079 err_t result;
AdamGreen 0:3b00827bb0b7 1080 u16_t msecs;
AdamGreen 0:3b00827bb0b7 1081 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
AdamGreen 0:3b00827bb0b7 1082 dhcp_set_state(dhcp, DHCP_REBINDING);
AdamGreen 0:3b00827bb0b7 1083
AdamGreen 0:3b00827bb0b7 1084 /* create and initialize the DHCP message header */
AdamGreen 0:3b00827bb0b7 1085 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
AdamGreen 0:3b00827bb0b7 1086 if (result == ERR_OK) {
AdamGreen 0:3b00827bb0b7 1087 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
AdamGreen 0:3b00827bb0b7 1088 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
AdamGreen 0:3b00827bb0b7 1089
AdamGreen 0:3b00827bb0b7 1090 #if LWIP_NETIF_HOSTNAME
AdamGreen 0:3b00827bb0b7 1091 if (netif->hostname != NULL) {
AdamGreen 0:3b00827bb0b7 1092 const char *p = (const char*)netif->hostname;
AdamGreen 0:3b00827bb0b7 1093 u8_t namelen = (u8_t)strlen(p);
AdamGreen 0:3b00827bb0b7 1094 if (namelen > 0) {
AdamGreen 0:3b00827bb0b7 1095 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
AdamGreen 0:3b00827bb0b7 1096 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
AdamGreen 0:3b00827bb0b7 1097 while (*p) {
AdamGreen 0:3b00827bb0b7 1098 dhcp_option_byte(dhcp, *p++);
AdamGreen 0:3b00827bb0b7 1099 }
AdamGreen 0:3b00827bb0b7 1100 }
AdamGreen 0:3b00827bb0b7 1101 }
AdamGreen 0:3b00827bb0b7 1102 #endif /* LWIP_NETIF_HOSTNAME */
AdamGreen 0:3b00827bb0b7 1103
AdamGreen 0:3b00827bb0b7 1104 #if 0
AdamGreen 0:3b00827bb0b7 1105 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
AdamGreen 0:3b00827bb0b7 1106 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
AdamGreen 0:3b00827bb0b7 1107
AdamGreen 0:3b00827bb0b7 1108 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
AdamGreen 0:3b00827bb0b7 1109 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
AdamGreen 0:3b00827bb0b7 1110 #endif
AdamGreen 0:3b00827bb0b7 1111
AdamGreen 0:3b00827bb0b7 1112 dhcp_option_trailer(dhcp);
AdamGreen 0:3b00827bb0b7 1113
AdamGreen 0:3b00827bb0b7 1114 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen 0:3b00827bb0b7 1115
AdamGreen 0:3b00827bb0b7 1116 /* broadcast to server */
AdamGreen 0:3b00827bb0b7 1117 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
AdamGreen 0:3b00827bb0b7 1118 dhcp_delete_msg(dhcp);
AdamGreen 0:3b00827bb0b7 1119 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
AdamGreen 0:3b00827bb0b7 1120 } else {
AdamGreen 0:3b00827bb0b7 1121 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
AdamGreen 0:3b00827bb0b7 1122 }
AdamGreen 0:3b00827bb0b7 1123 dhcp->tries++;
AdamGreen 0:3b00827bb0b7 1124 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
AdamGreen 0:3b00827bb0b7 1125 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen 0:3b00827bb0b7 1126 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen 0:3b00827bb0b7 1127 return result;
AdamGreen 0:3b00827bb0b7 1128 }
AdamGreen 0:3b00827bb0b7 1129
AdamGreen 0:3b00827bb0b7 1130 /**
AdamGreen 0:3b00827bb0b7 1131 * Enter REBOOTING state to verify an existing lease
AdamGreen 0:3b00827bb0b7 1132 *
AdamGreen 0:3b00827bb0b7 1133 * @param netif network interface which must reboot
AdamGreen 0:3b00827bb0b7 1134 */
AdamGreen 0:3b00827bb0b7 1135 static err_t
AdamGreen 0:3b00827bb0b7 1136 dhcp_reboot(struct netif *netif)
AdamGreen 0:3b00827bb0b7 1137 {
AdamGreen 0:3b00827bb0b7 1138 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 1139 err_t result;
AdamGreen 0:3b00827bb0b7 1140 u16_t msecs;
AdamGreen 0:3b00827bb0b7 1141 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
AdamGreen 0:3b00827bb0b7 1142 dhcp_set_state(dhcp, DHCP_REBOOTING);
AdamGreen 0:3b00827bb0b7 1143
AdamGreen 0:3b00827bb0b7 1144 /* create and initialize the DHCP message header */
AdamGreen 0:3b00827bb0b7 1145 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
AdamGreen 0:3b00827bb0b7 1146 if (result == ERR_OK) {
AdamGreen 0:3b00827bb0b7 1147 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
AdamGreen 0:3b00827bb0b7 1148 dhcp_option_short(dhcp, 576);
AdamGreen 0:3b00827bb0b7 1149
AdamGreen 0:3b00827bb0b7 1150 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
AdamGreen 0:3b00827bb0b7 1151 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
AdamGreen 0:3b00827bb0b7 1152
AdamGreen 0:3b00827bb0b7 1153 dhcp_option_trailer(dhcp);
AdamGreen 0:3b00827bb0b7 1154
AdamGreen 0:3b00827bb0b7 1155 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen 0:3b00827bb0b7 1156
AdamGreen 0:3b00827bb0b7 1157 /* broadcast to server */
AdamGreen 0:3b00827bb0b7 1158 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
AdamGreen 0:3b00827bb0b7 1159 dhcp_delete_msg(dhcp);
AdamGreen 0:3b00827bb0b7 1160 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
AdamGreen 0:3b00827bb0b7 1161 } else {
AdamGreen 0:3b00827bb0b7 1162 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
AdamGreen 0:3b00827bb0b7 1163 }
AdamGreen 0:3b00827bb0b7 1164 dhcp->tries++;
AdamGreen 0:3b00827bb0b7 1165 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
AdamGreen 0:3b00827bb0b7 1166 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen 0:3b00827bb0b7 1167 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen 0:3b00827bb0b7 1168 return result;
AdamGreen 0:3b00827bb0b7 1169 }
AdamGreen 0:3b00827bb0b7 1170
AdamGreen 0:3b00827bb0b7 1171
AdamGreen 0:3b00827bb0b7 1172 /**
AdamGreen 0:3b00827bb0b7 1173 * Release a DHCP lease.
AdamGreen 0:3b00827bb0b7 1174 *
AdamGreen 0:3b00827bb0b7 1175 * @param netif network interface which must release its lease
AdamGreen 0:3b00827bb0b7 1176 */
AdamGreen 0:3b00827bb0b7 1177 err_t
AdamGreen 0:3b00827bb0b7 1178 dhcp_release(struct netif *netif)
AdamGreen 0:3b00827bb0b7 1179 {
AdamGreen 0:3b00827bb0b7 1180 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 1181 err_t result;
AdamGreen 0:3b00827bb0b7 1182 u16_t msecs;
AdamGreen 0:3b00827bb0b7 1183 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
AdamGreen 0:3b00827bb0b7 1184
AdamGreen 0:3b00827bb0b7 1185 /* idle DHCP client */
AdamGreen 0:3b00827bb0b7 1186 dhcp_set_state(dhcp, DHCP_OFF);
AdamGreen 0:3b00827bb0b7 1187 /* clean old DHCP offer */
AdamGreen 0:3b00827bb0b7 1188 ip_addr_set_zero(&dhcp->server_ip_addr);
AdamGreen 0:3b00827bb0b7 1189 ip_addr_set_zero(&dhcp->offered_ip_addr);
AdamGreen 0:3b00827bb0b7 1190 ip_addr_set_zero(&dhcp->offered_sn_mask);
AdamGreen 0:3b00827bb0b7 1191 ip_addr_set_zero(&dhcp->offered_gw_addr);
AdamGreen 0:3b00827bb0b7 1192 #if LWIP_DHCP_BOOTP_FILE
AdamGreen 0:3b00827bb0b7 1193 ip_addr_set_zero(&dhcp->offered_si_addr);
AdamGreen 0:3b00827bb0b7 1194 #endif /* LWIP_DHCP_BOOTP_FILE */
AdamGreen 0:3b00827bb0b7 1195 dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
AdamGreen 0:3b00827bb0b7 1196
AdamGreen 0:3b00827bb0b7 1197 /* create and initialize the DHCP message header */
AdamGreen 0:3b00827bb0b7 1198 result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
AdamGreen 0:3b00827bb0b7 1199 if (result == ERR_OK) {
AdamGreen 0:3b00827bb0b7 1200 dhcp_option_trailer(dhcp);
AdamGreen 0:3b00827bb0b7 1201
AdamGreen 0:3b00827bb0b7 1202 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
AdamGreen 0:3b00827bb0b7 1203
AdamGreen 0:3b00827bb0b7 1204 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
AdamGreen 0:3b00827bb0b7 1205 dhcp_delete_msg(dhcp);
AdamGreen 0:3b00827bb0b7 1206 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
AdamGreen 0:3b00827bb0b7 1207 } else {
AdamGreen 0:3b00827bb0b7 1208 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
AdamGreen 0:3b00827bb0b7 1209 }
AdamGreen 0:3b00827bb0b7 1210 dhcp->tries++;
AdamGreen 0:3b00827bb0b7 1211 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
AdamGreen 0:3b00827bb0b7 1212 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
AdamGreen 0:3b00827bb0b7 1213 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
AdamGreen 0:3b00827bb0b7 1214 /* bring the interface down */
AdamGreen 0:3b00827bb0b7 1215 netif_set_down(netif);
AdamGreen 0:3b00827bb0b7 1216 /* remove IP address from interface */
AdamGreen 0:3b00827bb0b7 1217 netif_set_ipaddr(netif, IP_ADDR_ANY);
AdamGreen 0:3b00827bb0b7 1218 netif_set_gw(netif, IP_ADDR_ANY);
AdamGreen 0:3b00827bb0b7 1219 netif_set_netmask(netif, IP_ADDR_ANY);
AdamGreen 0:3b00827bb0b7 1220
AdamGreen 0:3b00827bb0b7 1221 return result;
AdamGreen 0:3b00827bb0b7 1222 }
AdamGreen 0:3b00827bb0b7 1223
AdamGreen 0:3b00827bb0b7 1224 /**
AdamGreen 0:3b00827bb0b7 1225 * Remove the DHCP client from the interface.
AdamGreen 0:3b00827bb0b7 1226 *
AdamGreen 0:3b00827bb0b7 1227 * @param netif The network interface to stop DHCP on
AdamGreen 0:3b00827bb0b7 1228 */
AdamGreen 0:3b00827bb0b7 1229 void
AdamGreen 0:3b00827bb0b7 1230 dhcp_stop(struct netif *netif)
AdamGreen 0:3b00827bb0b7 1231 {
AdamGreen 0:3b00827bb0b7 1232 struct dhcp *dhcp;
AdamGreen 0:3b00827bb0b7 1233 LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
AdamGreen 0:3b00827bb0b7 1234 dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 1235 /* Remove the flag that says this netif is handled by DHCP. */
AdamGreen 0:3b00827bb0b7 1236 netif->flags &= ~NETIF_FLAG_DHCP;
AdamGreen 0:3b00827bb0b7 1237
AdamGreen 0:3b00827bb0b7 1238 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
AdamGreen 0:3b00827bb0b7 1239 /* netif is DHCP configured? */
AdamGreen 0:3b00827bb0b7 1240 if (dhcp != NULL) {
AdamGreen 0:3b00827bb0b7 1241 #if LWIP_DHCP_AUTOIP_COOP
AdamGreen 0:3b00827bb0b7 1242 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
AdamGreen 0:3b00827bb0b7 1243 autoip_stop(netif);
AdamGreen 0:3b00827bb0b7 1244 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
AdamGreen 0:3b00827bb0b7 1245 }
AdamGreen 0:3b00827bb0b7 1246 #endif /* LWIP_DHCP_AUTOIP_COOP */
AdamGreen 0:3b00827bb0b7 1247
AdamGreen 0:3b00827bb0b7 1248 if (dhcp->pcb != NULL) {
AdamGreen 0:3b00827bb0b7 1249 udp_remove(dhcp->pcb);
AdamGreen 0:3b00827bb0b7 1250 dhcp->pcb = NULL;
AdamGreen 0:3b00827bb0b7 1251 }
AdamGreen 0:3b00827bb0b7 1252 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
AdamGreen 0:3b00827bb0b7 1253 dhcp_set_state(dhcp, DHCP_OFF);
AdamGreen 0:3b00827bb0b7 1254 }
AdamGreen 0:3b00827bb0b7 1255 }
AdamGreen 0:3b00827bb0b7 1256
AdamGreen 0:3b00827bb0b7 1257 /*
AdamGreen 0:3b00827bb0b7 1258 * Set the DHCP state of a DHCP client.
AdamGreen 0:3b00827bb0b7 1259 *
AdamGreen 0:3b00827bb0b7 1260 * If the state changed, reset the number of tries.
AdamGreen 0:3b00827bb0b7 1261 */
AdamGreen 0:3b00827bb0b7 1262 static void
AdamGreen 0:3b00827bb0b7 1263 dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
AdamGreen 0:3b00827bb0b7 1264 {
AdamGreen 0:3b00827bb0b7 1265 if (new_state != dhcp->state) {
AdamGreen 0:3b00827bb0b7 1266 dhcp->state = new_state;
AdamGreen 0:3b00827bb0b7 1267 dhcp->tries = 0;
AdamGreen 0:3b00827bb0b7 1268 dhcp->request_timeout = 0;
AdamGreen 0:3b00827bb0b7 1269 }
AdamGreen 0:3b00827bb0b7 1270 }
AdamGreen 0:3b00827bb0b7 1271
AdamGreen 0:3b00827bb0b7 1272 /*
AdamGreen 0:3b00827bb0b7 1273 * Concatenate an option type and length field to the outgoing
AdamGreen 0:3b00827bb0b7 1274 * DHCP message.
AdamGreen 0:3b00827bb0b7 1275 *
AdamGreen 0:3b00827bb0b7 1276 */
AdamGreen 0:3b00827bb0b7 1277 static void
AdamGreen 0:3b00827bb0b7 1278 dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
AdamGreen 0:3b00827bb0b7 1279 {
AdamGreen 0:3b00827bb0b7 1280 LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
AdamGreen 0:3b00827bb0b7 1281 dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
AdamGreen 0:3b00827bb0b7 1282 dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
AdamGreen 0:3b00827bb0b7 1283 }
AdamGreen 0:3b00827bb0b7 1284 /*
AdamGreen 0:3b00827bb0b7 1285 * Concatenate a single byte to the outgoing DHCP message.
AdamGreen 0:3b00827bb0b7 1286 *
AdamGreen 0:3b00827bb0b7 1287 */
AdamGreen 0:3b00827bb0b7 1288 static void
AdamGreen 0:3b00827bb0b7 1289 dhcp_option_byte(struct dhcp *dhcp, u8_t value)
AdamGreen 0:3b00827bb0b7 1290 {
AdamGreen 0:3b00827bb0b7 1291 LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
AdamGreen 0:3b00827bb0b7 1292 dhcp->msg_out->options[dhcp->options_out_len++] = value;
AdamGreen 0:3b00827bb0b7 1293 }
AdamGreen 0:3b00827bb0b7 1294
AdamGreen 0:3b00827bb0b7 1295 static void
AdamGreen 0:3b00827bb0b7 1296 dhcp_option_short(struct dhcp *dhcp, u16_t value)
AdamGreen 0:3b00827bb0b7 1297 {
AdamGreen 0:3b00827bb0b7 1298 LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
AdamGreen 0:3b00827bb0b7 1299 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
AdamGreen 0:3b00827bb0b7 1300 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
AdamGreen 0:3b00827bb0b7 1301 }
AdamGreen 0:3b00827bb0b7 1302
AdamGreen 0:3b00827bb0b7 1303 static void
AdamGreen 0:3b00827bb0b7 1304 dhcp_option_long(struct dhcp *dhcp, u32_t value)
AdamGreen 0:3b00827bb0b7 1305 {
AdamGreen 0:3b00827bb0b7 1306 LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
AdamGreen 0:3b00827bb0b7 1307 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
AdamGreen 0:3b00827bb0b7 1308 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
AdamGreen 0:3b00827bb0b7 1309 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
AdamGreen 0:3b00827bb0b7 1310 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
AdamGreen 0:3b00827bb0b7 1311 }
AdamGreen 0:3b00827bb0b7 1312
AdamGreen 0:3b00827bb0b7 1313 /**
AdamGreen 0:3b00827bb0b7 1314 * Extract the DHCP message and the DHCP options.
AdamGreen 0:3b00827bb0b7 1315 *
AdamGreen 0:3b00827bb0b7 1316 * Extract the DHCP message and the DHCP options, each into a contiguous
AdamGreen 0:3b00827bb0b7 1317 * piece of memory. As a DHCP message is variable sized by its options,
AdamGreen 0:3b00827bb0b7 1318 * and also allows overriding some fields for options, the easy approach
AdamGreen 0:3b00827bb0b7 1319 * is to first unfold the options into a conitguous piece of memory, and
AdamGreen 0:3b00827bb0b7 1320 * use that further on.
AdamGreen 0:3b00827bb0b7 1321 *
AdamGreen 0:3b00827bb0b7 1322 */
AdamGreen 0:3b00827bb0b7 1323 static err_t
AdamGreen 0:3b00827bb0b7 1324 dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
AdamGreen 0:3b00827bb0b7 1325 {
AdamGreen 0:3b00827bb0b7 1326 u8_t *options;
AdamGreen 0:3b00827bb0b7 1327 u16_t offset;
AdamGreen 0:3b00827bb0b7 1328 u16_t offset_max;
AdamGreen 0:3b00827bb0b7 1329 u16_t options_idx;
AdamGreen 0:3b00827bb0b7 1330 u16_t options_idx_max;
AdamGreen 0:3b00827bb0b7 1331 struct pbuf *q;
AdamGreen 0:3b00827bb0b7 1332 int parse_file_as_options = 0;
AdamGreen 0:3b00827bb0b7 1333 int parse_sname_as_options = 0;
AdamGreen 0:3b00827bb0b7 1334
AdamGreen 0:3b00827bb0b7 1335 /* clear received options */
AdamGreen 0:3b00827bb0b7 1336 dhcp_clear_all_options(dhcp);
AdamGreen 0:3b00827bb0b7 1337 /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
AdamGreen 0:3b00827bb0b7 1338 if (p->len < DHCP_SNAME_OFS) {
AdamGreen 0:3b00827bb0b7 1339 return ERR_BUF;
AdamGreen 0:3b00827bb0b7 1340 }
AdamGreen 0:3b00827bb0b7 1341 dhcp->msg_in = (struct dhcp_msg *)p->payload;
AdamGreen 0:3b00827bb0b7 1342 #if LWIP_DHCP_BOOTP_FILE
AdamGreen 0:3b00827bb0b7 1343 /* clear boot file name */
AdamGreen 0:3b00827bb0b7 1344 dhcp->boot_file_name[0] = 0;
AdamGreen 0:3b00827bb0b7 1345 #endif /* LWIP_DHCP_BOOTP_FILE */
AdamGreen 0:3b00827bb0b7 1346
AdamGreen 0:3b00827bb0b7 1347 /* parse options */
AdamGreen 0:3b00827bb0b7 1348
AdamGreen 0:3b00827bb0b7 1349 /* start with options field */
AdamGreen 0:3b00827bb0b7 1350 options_idx = DHCP_OPTIONS_OFS;
AdamGreen 0:3b00827bb0b7 1351 /* parse options to the end of the received packet */
AdamGreen 0:3b00827bb0b7 1352 options_idx_max = p->tot_len;
AdamGreen 0:3b00827bb0b7 1353 again:
AdamGreen 0:3b00827bb0b7 1354 q = p;
AdamGreen 0:3b00827bb0b7 1355 while((q != NULL) && (options_idx >= q->len)) {
AdamGreen 0:3b00827bb0b7 1356 options_idx -= q->len;
AdamGreen 0:3b00827bb0b7 1357 options_idx_max -= q->len;
AdamGreen 0:3b00827bb0b7 1358 q = q->next;
AdamGreen 0:3b00827bb0b7 1359 }
AdamGreen 0:3b00827bb0b7 1360 if (q == NULL) {
AdamGreen 0:3b00827bb0b7 1361 return ERR_BUF;
AdamGreen 0:3b00827bb0b7 1362 }
AdamGreen 0:3b00827bb0b7 1363 offset = options_idx;
AdamGreen 0:3b00827bb0b7 1364 offset_max = options_idx_max;
AdamGreen 0:3b00827bb0b7 1365 options = (u8_t*)q->payload;
AdamGreen 0:3b00827bb0b7 1366 /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
AdamGreen 0:3b00827bb0b7 1367 while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
AdamGreen 0:3b00827bb0b7 1368 u8_t op = options[offset];
AdamGreen 0:3b00827bb0b7 1369 u8_t len;
AdamGreen 0:3b00827bb0b7 1370 u8_t decode_len = 0;
AdamGreen 0:3b00827bb0b7 1371 int decode_idx = -1;
AdamGreen 0:3b00827bb0b7 1372 u16_t val_offset = offset + 2;
AdamGreen 0:3b00827bb0b7 1373 /* len byte might be in the next pbuf */
AdamGreen 0:3b00827bb0b7 1374 if (offset + 1 < q->len) {
AdamGreen 0:3b00827bb0b7 1375 len = options[offset + 1];
AdamGreen 0:3b00827bb0b7 1376 } else {
AdamGreen 0:3b00827bb0b7 1377 len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
AdamGreen 0:3b00827bb0b7 1378 }
AdamGreen 0:3b00827bb0b7 1379 /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
AdamGreen 0:3b00827bb0b7 1380 decode_len = len;
AdamGreen 0:3b00827bb0b7 1381 switch(op) {
AdamGreen 0:3b00827bb0b7 1382 /* case(DHCP_OPTION_END): handled above */
AdamGreen 0:3b00827bb0b7 1383 case(DHCP_OPTION_PAD):
AdamGreen 0:3b00827bb0b7 1384 /* special option: no len encoded */
AdamGreen 0:3b00827bb0b7 1385 decode_len = len = 0;
AdamGreen 0:3b00827bb0b7 1386 /* will be increased below */
AdamGreen 0:3b00827bb0b7 1387 offset--;
AdamGreen 0:3b00827bb0b7 1388 break;
AdamGreen 0:3b00827bb0b7 1389 case(DHCP_OPTION_SUBNET_MASK):
AdamGreen 0:3b00827bb0b7 1390 LWIP_ASSERT("len == 4", len == 4);
AdamGreen 0:3b00827bb0b7 1391 decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
AdamGreen 0:3b00827bb0b7 1392 break;
AdamGreen 0:3b00827bb0b7 1393 case(DHCP_OPTION_ROUTER):
AdamGreen 0:3b00827bb0b7 1394 decode_len = 4; /* only copy the first given router */
AdamGreen 0:3b00827bb0b7 1395 LWIP_ASSERT("len >= decode_len", len >= decode_len);
AdamGreen 0:3b00827bb0b7 1396 decode_idx = DHCP_OPTION_IDX_ROUTER;
AdamGreen 0:3b00827bb0b7 1397 break;
AdamGreen 0:3b00827bb0b7 1398 case(DHCP_OPTION_DNS_SERVER):
AdamGreen 0:3b00827bb0b7 1399 /* special case: there might be more than one server */
AdamGreen 0:3b00827bb0b7 1400 LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
AdamGreen 0:3b00827bb0b7 1401 /* limit number of DNS servers */
AdamGreen 0:3b00827bb0b7 1402 decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
AdamGreen 0:3b00827bb0b7 1403 LWIP_ASSERT("len >= decode_len", len >= decode_len);
AdamGreen 0:3b00827bb0b7 1404 decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
AdamGreen 0:3b00827bb0b7 1405 break;
AdamGreen 0:3b00827bb0b7 1406 case(DHCP_OPTION_LEASE_TIME):
AdamGreen 0:3b00827bb0b7 1407 LWIP_ASSERT("len == 4", len == 4);
AdamGreen 0:3b00827bb0b7 1408 decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
AdamGreen 0:3b00827bb0b7 1409 break;
AdamGreen 0:3b00827bb0b7 1410 case(DHCP_OPTION_OVERLOAD):
AdamGreen 0:3b00827bb0b7 1411 LWIP_ASSERT("len == 1", len == 1);
AdamGreen 0:3b00827bb0b7 1412 decode_idx = DHCP_OPTION_IDX_OVERLOAD;
AdamGreen 0:3b00827bb0b7 1413 break;
AdamGreen 0:3b00827bb0b7 1414 case(DHCP_OPTION_MESSAGE_TYPE):
AdamGreen 0:3b00827bb0b7 1415 LWIP_ASSERT("len == 1", len == 1);
AdamGreen 0:3b00827bb0b7 1416 decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
AdamGreen 0:3b00827bb0b7 1417 break;
AdamGreen 0:3b00827bb0b7 1418 case(DHCP_OPTION_SERVER_ID):
AdamGreen 0:3b00827bb0b7 1419 LWIP_ASSERT("len == 4", len == 4);
AdamGreen 0:3b00827bb0b7 1420 decode_idx = DHCP_OPTION_IDX_SERVER_ID;
AdamGreen 0:3b00827bb0b7 1421 break;
AdamGreen 0:3b00827bb0b7 1422 case(DHCP_OPTION_T1):
AdamGreen 0:3b00827bb0b7 1423 LWIP_ASSERT("len == 4", len == 4);
AdamGreen 0:3b00827bb0b7 1424 decode_idx = DHCP_OPTION_IDX_T1;
AdamGreen 0:3b00827bb0b7 1425 break;
AdamGreen 0:3b00827bb0b7 1426 case(DHCP_OPTION_T2):
AdamGreen 0:3b00827bb0b7 1427 LWIP_ASSERT("len == 4", len == 4);
AdamGreen 0:3b00827bb0b7 1428 decode_idx = DHCP_OPTION_IDX_T2;
AdamGreen 0:3b00827bb0b7 1429 break;
AdamGreen 0:3b00827bb0b7 1430 default:
AdamGreen 0:3b00827bb0b7 1431 decode_len = 0;
AdamGreen 0:3b00827bb0b7 1432 LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
AdamGreen 0:3b00827bb0b7 1433 break;
AdamGreen 0:3b00827bb0b7 1434 }
AdamGreen 0:3b00827bb0b7 1435 offset += len + 2;
AdamGreen 0:3b00827bb0b7 1436 if (decode_len > 0) {
AdamGreen 0:3b00827bb0b7 1437 u32_t value = 0;
AdamGreen 0:3b00827bb0b7 1438 u16_t copy_len;
AdamGreen 0:3b00827bb0b7 1439 decode_next:
AdamGreen 0:3b00827bb0b7 1440 LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
AdamGreen 0:3b00827bb0b7 1441 LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
AdamGreen 0:3b00827bb0b7 1442 copy_len = LWIP_MIN(decode_len, 4);
AdamGreen 0:3b00827bb0b7 1443 pbuf_copy_partial(q, &value, copy_len, val_offset);
AdamGreen 0:3b00827bb0b7 1444 if (decode_len > 4) {
AdamGreen 0:3b00827bb0b7 1445 /* decode more than one u32_t */
AdamGreen 0:3b00827bb0b7 1446 LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
AdamGreen 0:3b00827bb0b7 1447 dhcp_got_option(dhcp, decode_idx);
AdamGreen 0:3b00827bb0b7 1448 dhcp_set_option_value(dhcp, decode_idx, htonl(value));
AdamGreen 0:3b00827bb0b7 1449 decode_len -= 4;
AdamGreen 0:3b00827bb0b7 1450 val_offset += 4;
AdamGreen 0:3b00827bb0b7 1451 decode_idx++;
AdamGreen 0:3b00827bb0b7 1452 goto decode_next;
AdamGreen 0:3b00827bb0b7 1453 } else if (decode_len == 4) {
AdamGreen 0:3b00827bb0b7 1454 value = ntohl(value);
AdamGreen 0:3b00827bb0b7 1455 } else {
AdamGreen 0:3b00827bb0b7 1456 LWIP_ASSERT("invalid decode_len", decode_len == 1);
AdamGreen 0:3b00827bb0b7 1457 value = ((u8_t*)&value)[0];
AdamGreen 0:3b00827bb0b7 1458 }
AdamGreen 0:3b00827bb0b7 1459 dhcp_got_option(dhcp, decode_idx);
AdamGreen 0:3b00827bb0b7 1460 dhcp_set_option_value(dhcp, decode_idx, value);
AdamGreen 0:3b00827bb0b7 1461 }
AdamGreen 0:3b00827bb0b7 1462 if (offset >= q->len) {
AdamGreen 0:3b00827bb0b7 1463 offset -= q->len;
AdamGreen 0:3b00827bb0b7 1464 offset_max -= q->len;
AdamGreen 0:3b00827bb0b7 1465 q = q->next;
AdamGreen 0:3b00827bb0b7 1466 options = (u8_t*)q->payload;
AdamGreen 0:3b00827bb0b7 1467 }
AdamGreen 0:3b00827bb0b7 1468 }
AdamGreen 0:3b00827bb0b7 1469 /* is this an overloaded message? */
AdamGreen 0:3b00827bb0b7 1470 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
AdamGreen 0:3b00827bb0b7 1471 u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
AdamGreen 0:3b00827bb0b7 1472 dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
AdamGreen 0:3b00827bb0b7 1473 if (overload == DHCP_OVERLOAD_FILE) {
AdamGreen 0:3b00827bb0b7 1474 parse_file_as_options = 1;
AdamGreen 0:3b00827bb0b7 1475 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
AdamGreen 0:3b00827bb0b7 1476 } else if (overload == DHCP_OVERLOAD_SNAME) {
AdamGreen 0:3b00827bb0b7 1477 parse_sname_as_options = 1;
AdamGreen 0:3b00827bb0b7 1478 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
AdamGreen 0:3b00827bb0b7 1479 } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
AdamGreen 0:3b00827bb0b7 1480 parse_sname_as_options = 1;
AdamGreen 0:3b00827bb0b7 1481 parse_file_as_options = 1;
AdamGreen 0:3b00827bb0b7 1482 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
AdamGreen 0:3b00827bb0b7 1483 } else {
AdamGreen 0:3b00827bb0b7 1484 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
AdamGreen 0:3b00827bb0b7 1485 }
AdamGreen 0:3b00827bb0b7 1486 #if LWIP_DHCP_BOOTP_FILE
AdamGreen 0:3b00827bb0b7 1487 if (!parse_file_as_options) {
AdamGreen 0:3b00827bb0b7 1488 /* only do this for ACK messages */
AdamGreen 0:3b00827bb0b7 1489 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
AdamGreen 0:3b00827bb0b7 1490 (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
AdamGreen 0:3b00827bb0b7 1491 /* copy bootp file name, don't care for sname (server hostname) */
AdamGreen 0:3b00827bb0b7 1492 pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
AdamGreen 0:3b00827bb0b7 1493 /* make sure the string is really NULL-terminated */
AdamGreen 0:3b00827bb0b7 1494 dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
AdamGreen 0:3b00827bb0b7 1495 }
AdamGreen 0:3b00827bb0b7 1496 #endif /* LWIP_DHCP_BOOTP_FILE */
AdamGreen 0:3b00827bb0b7 1497 }
AdamGreen 0:3b00827bb0b7 1498 if (parse_file_as_options) {
AdamGreen 0:3b00827bb0b7 1499 /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
AdamGreen 0:3b00827bb0b7 1500 parse_file_as_options = 0;
AdamGreen 0:3b00827bb0b7 1501 options_idx = DHCP_FILE_OFS;
AdamGreen 0:3b00827bb0b7 1502 options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
AdamGreen 0:3b00827bb0b7 1503 goto again;
AdamGreen 0:3b00827bb0b7 1504 } else if (parse_sname_as_options) {
AdamGreen 0:3b00827bb0b7 1505 parse_sname_as_options = 0;
AdamGreen 0:3b00827bb0b7 1506 options_idx = DHCP_SNAME_OFS;
AdamGreen 0:3b00827bb0b7 1507 options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
AdamGreen 0:3b00827bb0b7 1508 goto again;
AdamGreen 0:3b00827bb0b7 1509 }
AdamGreen 0:3b00827bb0b7 1510 return ERR_OK;
AdamGreen 0:3b00827bb0b7 1511 }
AdamGreen 0:3b00827bb0b7 1512
AdamGreen 0:3b00827bb0b7 1513 /**
AdamGreen 0:3b00827bb0b7 1514 * If an incoming DHCP message is in response to us, then trigger the state machine
AdamGreen 0:3b00827bb0b7 1515 */
AdamGreen 0:3b00827bb0b7 1516 static void
AdamGreen 0:3b00827bb0b7 1517 dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
AdamGreen 0:3b00827bb0b7 1518 {
AdamGreen 0:3b00827bb0b7 1519 struct netif *netif = (struct netif *)arg;
AdamGreen 0:3b00827bb0b7 1520 struct dhcp *dhcp = netif->dhcp;
AdamGreen 0:3b00827bb0b7 1521 struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
AdamGreen 0:3b00827bb0b7 1522 u8_t msg_type;
AdamGreen 0:3b00827bb0b7 1523 u8_t i;
AdamGreen 0:3b00827bb0b7 1524 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_recv(pbuf = %p) from DHCP server %"U16_F".%"U16_F".%"U16_F".%"U16_F" port %"U16_F"\n", (void*)p,
AdamGreen 0:3b00827bb0b7 1525 ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
AdamGreen 0:3b00827bb0b7 1526 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
AdamGreen 0:3b00827bb0b7 1527 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
AdamGreen 0:3b00827bb0b7 1528 /* prevent warnings about unused arguments */
AdamGreen 0:3b00827bb0b7 1529 LWIP_UNUSED_ARG(pcb);
AdamGreen 0:3b00827bb0b7 1530 LWIP_UNUSED_ARG(addr);
AdamGreen 0:3b00827bb0b7 1531 LWIP_UNUSED_ARG(port);
AdamGreen 0:3b00827bb0b7 1532
AdamGreen 0:3b00827bb0b7 1533 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
AdamGreen 0:3b00827bb0b7 1534
AdamGreen 0:3b00827bb0b7 1535 if (p->len < DHCP_MIN_REPLY_LEN) {
AdamGreen 0:3b00827bb0b7 1536 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
AdamGreen 0:3b00827bb0b7 1537 goto free_pbuf_and_return;
AdamGreen 0:3b00827bb0b7 1538 }
AdamGreen 0:3b00827bb0b7 1539
AdamGreen 0:3b00827bb0b7 1540 if (reply_msg->op != DHCP_BOOTREPLY) {
AdamGreen 0:3b00827bb0b7 1541 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("not a DHCP reply message, but type %"U16_F"\n", (u16_t)reply_msg->op));
AdamGreen 0:3b00827bb0b7 1542 goto free_pbuf_and_return;
AdamGreen 0:3b00827bb0b7 1543 }
AdamGreen 0:3b00827bb0b7 1544 /* iterate through hardware address and match against DHCP message */
AdamGreen 0:3b00827bb0b7 1545 for (i = 0; i < netif->hwaddr_len; i++) {
AdamGreen 0:3b00827bb0b7 1546 if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
AdamGreen 0:3b00827bb0b7 1547 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
AdamGreen 0:3b00827bb0b7 1548 ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
AdamGreen 0:3b00827bb0b7 1549 (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
AdamGreen 0:3b00827bb0b7 1550 goto free_pbuf_and_return;
AdamGreen 0:3b00827bb0b7 1551 }
AdamGreen 0:3b00827bb0b7 1552 }
AdamGreen 0:3b00827bb0b7 1553 /* match transaction ID against what we expected */
AdamGreen 0:3b00827bb0b7 1554 if (ntohl(reply_msg->xid) != dhcp->xid) {
AdamGreen 0:3b00827bb0b7 1555 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
AdamGreen 0:3b00827bb0b7 1556 ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
AdamGreen 0:3b00827bb0b7 1557 goto free_pbuf_and_return;
AdamGreen 0:3b00827bb0b7 1558 }
AdamGreen 0:3b00827bb0b7 1559 /* option fields could be unfold? */
AdamGreen 0:3b00827bb0b7 1560 if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
AdamGreen 0:3b00827bb0b7 1561 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
AdamGreen 0:3b00827bb0b7 1562 ("problem unfolding DHCP message - too short on memory?\n"));
AdamGreen 0:3b00827bb0b7 1563 goto free_pbuf_and_return;
AdamGreen 0:3b00827bb0b7 1564 }
AdamGreen 0:3b00827bb0b7 1565
AdamGreen 0:3b00827bb0b7 1566 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
AdamGreen 0:3b00827bb0b7 1567 /* obtain pointer to DHCP message type */
AdamGreen 0:3b00827bb0b7 1568 if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
AdamGreen 0:3b00827bb0b7 1569 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
AdamGreen 0:3b00827bb0b7 1570 goto free_pbuf_and_return;
AdamGreen 0:3b00827bb0b7 1571 }
AdamGreen 0:3b00827bb0b7 1572
AdamGreen 0:3b00827bb0b7 1573 /* read DHCP message type */
AdamGreen 0:3b00827bb0b7 1574 msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
AdamGreen 0:3b00827bb0b7 1575 /* message type is DHCP ACK? */
AdamGreen 0:3b00827bb0b7 1576 if (msg_type == DHCP_ACK) {
AdamGreen 0:3b00827bb0b7 1577 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
AdamGreen 0:3b00827bb0b7 1578 /* in requesting state? */
AdamGreen 0:3b00827bb0b7 1579 if (dhcp->state == DHCP_REQUESTING) {
AdamGreen 0:3b00827bb0b7 1580 dhcp_handle_ack(netif);
AdamGreen 0:3b00827bb0b7 1581 #if DHCP_DOES_ARP_CHECK
AdamGreen 0:3b00827bb0b7 1582 /* check if the acknowledged lease address is already in use */
AdamGreen 0:3b00827bb0b7 1583 dhcp_check(netif);
AdamGreen 0:3b00827bb0b7 1584 #else
AdamGreen 0:3b00827bb0b7 1585 /* bind interface to the acknowledged lease address */
AdamGreen 0:3b00827bb0b7 1586 dhcp_bind(netif);
AdamGreen 0:3b00827bb0b7 1587 #endif
AdamGreen 0:3b00827bb0b7 1588 }
AdamGreen 0:3b00827bb0b7 1589 /* already bound to the given lease address? */
AdamGreen 0:3b00827bb0b7 1590 else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
AdamGreen 0:3b00827bb0b7 1591 dhcp_bind(netif);
AdamGreen 0:3b00827bb0b7 1592 }
AdamGreen 0:3b00827bb0b7 1593 }
AdamGreen 0:3b00827bb0b7 1594 /* received a DHCP_NAK in appropriate state? */
AdamGreen 0:3b00827bb0b7 1595 else if ((msg_type == DHCP_NAK) &&
AdamGreen 0:3b00827bb0b7 1596 ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
AdamGreen 0:3b00827bb0b7 1597 (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
AdamGreen 0:3b00827bb0b7 1598 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
AdamGreen 0:3b00827bb0b7 1599 dhcp_handle_nak(netif);
AdamGreen 0:3b00827bb0b7 1600 }
AdamGreen 0:3b00827bb0b7 1601 /* received a DHCP_OFFER in DHCP_SELECTING state? */
AdamGreen 0:3b00827bb0b7 1602 else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
AdamGreen 0:3b00827bb0b7 1603 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
AdamGreen 0:3b00827bb0b7 1604 dhcp->request_timeout = 0;
AdamGreen 0:3b00827bb0b7 1605 /* remember offered lease */
AdamGreen 0:3b00827bb0b7 1606 dhcp_handle_offer(netif);
AdamGreen 0:3b00827bb0b7 1607 }
AdamGreen 0:3b00827bb0b7 1608 free_pbuf_and_return:
AdamGreen 0:3b00827bb0b7 1609 dhcp->msg_in = NULL;
AdamGreen 0:3b00827bb0b7 1610 pbuf_free(p);
AdamGreen 0:3b00827bb0b7 1611 }
AdamGreen 0:3b00827bb0b7 1612
AdamGreen 0:3b00827bb0b7 1613 /**
AdamGreen 0:3b00827bb0b7 1614 * Create a DHCP request, fill in common headers
AdamGreen 0:3b00827bb0b7 1615 *
AdamGreen 0:3b00827bb0b7 1616 * @param netif the netif under DHCP control
AdamGreen 0:3b00827bb0b7 1617 * @param dhcp dhcp control struct
AdamGreen 0:3b00827bb0b7 1618 * @param message_type message type of the request
AdamGreen 0:3b00827bb0b7 1619 */
AdamGreen 0:3b00827bb0b7 1620 static err_t
AdamGreen 0:3b00827bb0b7 1621 dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
AdamGreen 0:3b00827bb0b7 1622 {
AdamGreen 0:3b00827bb0b7 1623 u16_t i;
AdamGreen 0:3b00827bb0b7 1624 #ifndef DHCP_GLOBAL_XID
AdamGreen 0:3b00827bb0b7 1625 /** default global transaction identifier starting value (easy to match
AdamGreen 0:3b00827bb0b7 1626 * with a packet analyser). We simply increment for each new request.
AdamGreen 0:3b00827bb0b7 1627 * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
AdamGreen 0:3b00827bb0b7 1628 * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
AdamGreen 0:3b00827bb0b7 1629 static u32_t xid = 0xABCD0000;
AdamGreen 0:3b00827bb0b7 1630 #else
AdamGreen 0:3b00827bb0b7 1631 static u32_t xid;
AdamGreen 0:3b00827bb0b7 1632 static u8_t xid_initialised = 0;
AdamGreen 0:3b00827bb0b7 1633 if (!xid_initialised) {
AdamGreen 0:3b00827bb0b7 1634 xid = DHCP_GLOBAL_XID;
AdamGreen 0:3b00827bb0b7 1635 xid_initialised = !xid_initialised;
AdamGreen 0:3b00827bb0b7 1636 }
AdamGreen 0:3b00827bb0b7 1637 #endif
AdamGreen 0:3b00827bb0b7 1638 LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
AdamGreen 0:3b00827bb0b7 1639 LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
AdamGreen 0:3b00827bb0b7 1640 LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
AdamGreen 0:3b00827bb0b7 1641 LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
AdamGreen 0:3b00827bb0b7 1642 dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
AdamGreen 0:3b00827bb0b7 1643 if (dhcp->p_out == NULL) {
AdamGreen 0:3b00827bb0b7 1644 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
AdamGreen 0:3b00827bb0b7 1645 ("dhcp_create_msg(): could not allocate pbuf\n"));
AdamGreen 0:3b00827bb0b7 1646 return ERR_MEM;
AdamGreen 0:3b00827bb0b7 1647 }
AdamGreen 0:3b00827bb0b7 1648 LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
AdamGreen 0:3b00827bb0b7 1649 (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
AdamGreen 0:3b00827bb0b7 1650
AdamGreen 0:3b00827bb0b7 1651 /* reuse transaction identifier in retransmissions */
AdamGreen 0:3b00827bb0b7 1652 if (dhcp->tries == 0) {
AdamGreen 0:3b00827bb0b7 1653 xid++;
AdamGreen 0:3b00827bb0b7 1654 }
AdamGreen 0:3b00827bb0b7 1655 dhcp->xid = xid;
AdamGreen 0:3b00827bb0b7 1656 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
AdamGreen 0:3b00827bb0b7 1657 ("transaction id xid(%"X32_F")\n", xid));
AdamGreen 0:3b00827bb0b7 1658
AdamGreen 0:3b00827bb0b7 1659 dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
AdamGreen 0:3b00827bb0b7 1660
AdamGreen 0:3b00827bb0b7 1661 dhcp->msg_out->op = DHCP_BOOTREQUEST;
AdamGreen 0:3b00827bb0b7 1662 /* TODO: make link layer independent */
AdamGreen 0:3b00827bb0b7 1663 dhcp->msg_out->htype = DHCP_HTYPE_ETH;
AdamGreen 0:3b00827bb0b7 1664 dhcp->msg_out->hlen = netif->hwaddr_len;
AdamGreen 0:3b00827bb0b7 1665 dhcp->msg_out->hops = 0;
AdamGreen 0:3b00827bb0b7 1666 dhcp->msg_out->xid = htonl(dhcp->xid);
AdamGreen 0:3b00827bb0b7 1667 dhcp->msg_out->secs = 0;
AdamGreen 0:3b00827bb0b7 1668 /* we don't need the broadcast flag since we can receive unicast traffic
AdamGreen 0:3b00827bb0b7 1669 before being fully configured! */
AdamGreen 0:3b00827bb0b7 1670 dhcp->msg_out->flags = 0;
AdamGreen 0:3b00827bb0b7 1671 ip_addr_set_zero(&dhcp->msg_out->ciaddr);
AdamGreen 0:3b00827bb0b7 1672 /* set ciaddr to netif->ip_addr based on message_type and state */
AdamGreen 0:3b00827bb0b7 1673 if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
AdamGreen 0:3b00827bb0b7 1674 ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
AdamGreen 0:3b00827bb0b7 1675 ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
AdamGreen 0:3b00827bb0b7 1676 ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
AdamGreen 0:3b00827bb0b7 1677 }
AdamGreen 0:3b00827bb0b7 1678 ip_addr_set_zero(&dhcp->msg_out->yiaddr);
AdamGreen 0:3b00827bb0b7 1679 ip_addr_set_zero(&dhcp->msg_out->siaddr);
AdamGreen 0:3b00827bb0b7 1680 ip_addr_set_zero(&dhcp->msg_out->giaddr);
AdamGreen 0:3b00827bb0b7 1681 for (i = 0; i < netif->hwaddr_len; i++) {
AdamGreen 0:3b00827bb0b7 1682 /* copy netif hardware address */
AdamGreen 0:3b00827bb0b7 1683 dhcp->msg_out->chaddr[i] = netif->hwaddr[i];
AdamGreen 0:3b00827bb0b7 1684 }
AdamGreen 0:3b00827bb0b7 1685 for ( ; i < DHCP_CHADDR_LEN; i++) {
AdamGreen 0:3b00827bb0b7 1686 /* ... pad rest with zeroes */
AdamGreen 0:3b00827bb0b7 1687 dhcp->msg_out->chaddr[i] = 0;
AdamGreen 0:3b00827bb0b7 1688 }
AdamGreen 0:3b00827bb0b7 1689 for (i = 0; i < DHCP_SNAME_LEN; i++) {
AdamGreen 0:3b00827bb0b7 1690 dhcp->msg_out->sname[i] = 0;
AdamGreen 0:3b00827bb0b7 1691 }
AdamGreen 0:3b00827bb0b7 1692 for (i = 0; i < DHCP_FILE_LEN; i++) {
AdamGreen 0:3b00827bb0b7 1693 dhcp->msg_out->file[i] = 0;
AdamGreen 0:3b00827bb0b7 1694 }
AdamGreen 0:3b00827bb0b7 1695 dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
AdamGreen 0:3b00827bb0b7 1696 dhcp->options_out_len = 0;
AdamGreen 0:3b00827bb0b7 1697 /* fill options field with an incrementing array (for debugging purposes) */
AdamGreen 0:3b00827bb0b7 1698 for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
AdamGreen 0:3b00827bb0b7 1699 dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
AdamGreen 0:3b00827bb0b7 1700 }
AdamGreen 0:3b00827bb0b7 1701 /* Add option MESSAGE_TYPE */
AdamGreen 0:3b00827bb0b7 1702 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
AdamGreen 0:3b00827bb0b7 1703 dhcp_option_byte(dhcp, message_type);
AdamGreen 0:3b00827bb0b7 1704 return ERR_OK;
AdamGreen 0:3b00827bb0b7 1705 }
AdamGreen 0:3b00827bb0b7 1706
AdamGreen 0:3b00827bb0b7 1707 /**
AdamGreen 0:3b00827bb0b7 1708 * Free previously allocated memory used to send a DHCP request.
AdamGreen 0:3b00827bb0b7 1709 *
AdamGreen 0:3b00827bb0b7 1710 * @param dhcp the dhcp struct to free the request from
AdamGreen 0:3b00827bb0b7 1711 */
AdamGreen 0:3b00827bb0b7 1712 static void
AdamGreen 0:3b00827bb0b7 1713 dhcp_delete_msg(struct dhcp *dhcp)
AdamGreen 0:3b00827bb0b7 1714 {
AdamGreen 0:3b00827bb0b7 1715 LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
AdamGreen 0:3b00827bb0b7 1716 LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
AdamGreen 0:3b00827bb0b7 1717 LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
AdamGreen 0:3b00827bb0b7 1718 if (dhcp->p_out != NULL) {
AdamGreen 0:3b00827bb0b7 1719 pbuf_free(dhcp->p_out);
AdamGreen 0:3b00827bb0b7 1720 }
AdamGreen 0:3b00827bb0b7 1721 dhcp->p_out = NULL;
AdamGreen 0:3b00827bb0b7 1722 dhcp->msg_out = NULL;
AdamGreen 0:3b00827bb0b7 1723 }
AdamGreen 0:3b00827bb0b7 1724
AdamGreen 0:3b00827bb0b7 1725 /**
AdamGreen 0:3b00827bb0b7 1726 * Add a DHCP message trailer
AdamGreen 0:3b00827bb0b7 1727 *
AdamGreen 0:3b00827bb0b7 1728 * Adds the END option to the DHCP message, and if
AdamGreen 0:3b00827bb0b7 1729 * necessary, up to three padding bytes.
AdamGreen 0:3b00827bb0b7 1730 *
AdamGreen 0:3b00827bb0b7 1731 * @param dhcp DHCP state structure
AdamGreen 0:3b00827bb0b7 1732 */
AdamGreen 0:3b00827bb0b7 1733 static void
AdamGreen 0:3b00827bb0b7 1734 dhcp_option_trailer(struct dhcp *dhcp)
AdamGreen 0:3b00827bb0b7 1735 {
AdamGreen 0:3b00827bb0b7 1736 LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
AdamGreen 0:3b00827bb0b7 1737 LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
AdamGreen 0:3b00827bb0b7 1738 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
AdamGreen 0:3b00827bb0b7 1739 dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
AdamGreen 0:3b00827bb0b7 1740 /* packet is too small, or not 4 byte aligned? */
AdamGreen 0:3b00827bb0b7 1741 while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
AdamGreen 0:3b00827bb0b7 1742 /* LWIP_DEBUGF(DHCP_DEBUG,("dhcp_option_trailer:dhcp->options_out_len=%"U16_F", DHCP_OPTIONS_LEN=%"U16_F, dhcp->options_out_len, DHCP_OPTIONS_LEN)); */
AdamGreen 0:3b00827bb0b7 1743 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
AdamGreen 0:3b00827bb0b7 1744 /* add a fill/padding byte */
AdamGreen 0:3b00827bb0b7 1745 dhcp->msg_out->options[dhcp->options_out_len++] = 0;
AdamGreen 0:3b00827bb0b7 1746 }
AdamGreen 0:3b00827bb0b7 1747 }
AdamGreen 0:3b00827bb0b7 1748
AdamGreen 0:3b00827bb0b7 1749 #endif /* LWIP_DHCP */