孙 毅明 / Mbed 2 deprecated 123

创建mbed

Dependencies:   EthernetInterface SDFileSystem mbed-rtos mbed

EthernetInterface/lwip/core/dhcp.c@1:6465a3f5c58a, 2018-03-06 (annotated)

Committer:
sunyiming
Date:
Tue Mar 06 08:53:46 2018 +0000
Revision:
1:6465a3f5c58a
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
sunyiming 1:6465a3f5c58a 1 /**
sunyiming 1:6465a3f5c58a 2 * @file
sunyiming 1:6465a3f5c58a 3 * Dynamic Host Configuration Protocol client
sunyiming 1:6465a3f5c58a 4 *
sunyiming 1:6465a3f5c58a 5 */
sunyiming 1:6465a3f5c58a 6
sunyiming 1:6465a3f5c58a 7 /*
sunyiming 1:6465a3f5c58a 8 *
sunyiming 1:6465a3f5c58a 9 * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
sunyiming 1:6465a3f5c58a 10 * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
sunyiming 1:6465a3f5c58a 11 * All rights reserved.
sunyiming 1:6465a3f5c58a 12 *
sunyiming 1:6465a3f5c58a 13 * Redistribution and use in source and binary forms, with or without modification,
sunyiming 1:6465a3f5c58a 14 * are permitted provided that the following conditions are met:
sunyiming 1:6465a3f5c58a 15 *
sunyiming 1:6465a3f5c58a 16 * 1. Redistributions of source code must retain the above copyright notice,
sunyiming 1:6465a3f5c58a 17 * this list of conditions and the following disclaimer.
sunyiming 1:6465a3f5c58a 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
sunyiming 1:6465a3f5c58a 19 * this list of conditions and the following disclaimer in the documentation
sunyiming 1:6465a3f5c58a 20 * and/or other materials provided with the distribution.
sunyiming 1:6465a3f5c58a 21 * 3. The name of the author may not be used to endorse or promote products
sunyiming 1:6465a3f5c58a 22 * derived from this software without specific prior written permission.
sunyiming 1:6465a3f5c58a 23 *
sunyiming 1:6465a3f5c58a 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
sunyiming 1:6465a3f5c58a 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
sunyiming 1:6465a3f5c58a 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
sunyiming 1:6465a3f5c58a 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
sunyiming 1:6465a3f5c58a 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
sunyiming 1:6465a3f5c58a 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
sunyiming 1:6465a3f5c58a 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
sunyiming 1:6465a3f5c58a 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
sunyiming 1:6465a3f5c58a 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
sunyiming 1:6465a3f5c58a 33 * OF SUCH DAMAGE.
sunyiming 1:6465a3f5c58a 34 *
sunyiming 1:6465a3f5c58a 35 * This file is a contribution to the lwIP TCP/IP stack.
sunyiming 1:6465a3f5c58a 36 * The Swedish Institute of Computer Science and Adam Dunkels
sunyiming 1:6465a3f5c58a 37 * are specifically granted permission to redistribute this
sunyiming 1:6465a3f5c58a 38 * source code.
sunyiming 1:6465a3f5c58a 39 *
sunyiming 1:6465a3f5c58a 40 * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
sunyiming 1:6465a3f5c58a 41 *
sunyiming 1:6465a3f5c58a 42 * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
sunyiming 1:6465a3f5c58a 43 * with RFC 2131 and RFC 2132.
sunyiming 1:6465a3f5c58a 44 *
sunyiming 1:6465a3f5c58a 45 * TODO:
sunyiming 1:6465a3f5c58a 46 * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
sunyiming 1:6465a3f5c58a 47 *
sunyiming 1:6465a3f5c58a 48 * Please coordinate changes and requests with Leon Woestenberg
sunyiming 1:6465a3f5c58a 49 * <leon.woestenberg@gmx.net>
sunyiming 1:6465a3f5c58a 50 *
sunyiming 1:6465a3f5c58a 51 * Integration with your code:
sunyiming 1:6465a3f5c58a 52 *
sunyiming 1:6465a3f5c58a 53 * In lwip/dhcp.h
sunyiming 1:6465a3f5c58a 54 * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
sunyiming 1:6465a3f5c58a 55 * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
sunyiming 1:6465a3f5c58a 56 *
sunyiming 1:6465a3f5c58a 57 * Then have your application call dhcp_coarse_tmr() and
sunyiming 1:6465a3f5c58a 58 * dhcp_fine_tmr() on the defined intervals.
sunyiming 1:6465a3f5c58a 59 *
sunyiming 1:6465a3f5c58a 60 * dhcp_start(struct netif *netif);
sunyiming 1:6465a3f5c58a 61 * starts a DHCP client instance which configures the interface by
sunyiming 1:6465a3f5c58a 62 * obtaining an IP address lease and maintaining it.
sunyiming 1:6465a3f5c58a 63 *
sunyiming 1:6465a3f5c58a 64 * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
sunyiming 1:6465a3f5c58a 65 * to remove the DHCP client.
sunyiming 1:6465a3f5c58a 66 *
sunyiming 1:6465a3f5c58a 67 */
sunyiming 1:6465a3f5c58a 68
sunyiming 1:6465a3f5c58a 69 #include "lwip/opt.h"
sunyiming 1:6465a3f5c58a 70
sunyiming 1:6465a3f5c58a 71 #if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
sunyiming 1:6465a3f5c58a 72
sunyiming 1:6465a3f5c58a 73 #include "lwip/stats.h"
sunyiming 1:6465a3f5c58a 74 #include "lwip/mem.h"
sunyiming 1:6465a3f5c58a 75 #include "lwip/udp.h"
sunyiming 1:6465a3f5c58a 76 #include "lwip/ip_addr.h"
sunyiming 1:6465a3f5c58a 77 #include "lwip/netif.h"
sunyiming 1:6465a3f5c58a 78 #include "lwip/def.h"
sunyiming 1:6465a3f5c58a 79 #include "lwip/sys.h"
sunyiming 1:6465a3f5c58a 80 #include "lwip/dhcp.h"
sunyiming 1:6465a3f5c58a 81 #include "lwip/autoip.h"
sunyiming 1:6465a3f5c58a 82 #include "lwip/dns.h"
sunyiming 1:6465a3f5c58a 83 #include "netif/etharp.h"
sunyiming 1:6465a3f5c58a 84
sunyiming 1:6465a3f5c58a 85 #include <string.h>
sunyiming 1:6465a3f5c58a 86
sunyiming 1:6465a3f5c58a 87 /** Default for DHCP_GLOBAL_XID is 0xABCD0000
sunyiming 1:6465a3f5c58a 88 * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
sunyiming 1:6465a3f5c58a 89 * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
sunyiming 1:6465a3f5c58a 90 * #define DHCP_GLOBAL_XID rand()
sunyiming 1:6465a3f5c58a 91 */
sunyiming 1:6465a3f5c58a 92 #ifdef DHCP_GLOBAL_XID_HEADER
sunyiming 1:6465a3f5c58a 93 #include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
sunyiming 1:6465a3f5c58a 94 #endif
sunyiming 1:6465a3f5c58a 95
sunyiming 1:6465a3f5c58a 96 /** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
sunyiming 1:6465a3f5c58a 97 * MTU is checked to be big enough in dhcp_start */
sunyiming 1:6465a3f5c58a 98 #define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
sunyiming 1:6465a3f5c58a 99 #define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
sunyiming 1:6465a3f5c58a 100 /** Minimum length for reply before packet is parsed */
sunyiming 1:6465a3f5c58a 101 #define DHCP_MIN_REPLY_LEN 44
sunyiming 1:6465a3f5c58a 102
sunyiming 1:6465a3f5c58a 103 #define REBOOT_TRIES 2
sunyiming 1:6465a3f5c58a 104
sunyiming 1:6465a3f5c58a 105 /** Option handling: options are parsed in dhcp_parse_reply
sunyiming 1:6465a3f5c58a 106 * and saved in an array where other functions can load them from.
sunyiming 1:6465a3f5c58a 107 * This might be moved into the struct dhcp (not necessarily since
sunyiming 1:6465a3f5c58a 108 * lwIP is single-threaded and the array is only used while in recv
sunyiming 1:6465a3f5c58a 109 * callback). */
sunyiming 1:6465a3f5c58a 110 #define DHCP_OPTION_IDX_OVERLOAD 0
sunyiming 1:6465a3f5c58a 111 #define DHCP_OPTION_IDX_MSG_TYPE 1
sunyiming 1:6465a3f5c58a 112 #define DHCP_OPTION_IDX_SERVER_ID 2
sunyiming 1:6465a3f5c58a 113 #define DHCP_OPTION_IDX_LEASE_TIME 3
sunyiming 1:6465a3f5c58a 114 #define DHCP_OPTION_IDX_T1 4
sunyiming 1:6465a3f5c58a 115 #define DHCP_OPTION_IDX_T2 5
sunyiming 1:6465a3f5c58a 116 #define DHCP_OPTION_IDX_SUBNET_MASK 6
sunyiming 1:6465a3f5c58a 117 #define DHCP_OPTION_IDX_ROUTER 7
sunyiming 1:6465a3f5c58a 118 #define DHCP_OPTION_IDX_DNS_SERVER 8
sunyiming 1:6465a3f5c58a 119 #define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
sunyiming 1:6465a3f5c58a 120
sunyiming 1:6465a3f5c58a 121 /** Holds the decoded option values, only valid while in dhcp_recv.
sunyiming 1:6465a3f5c58a 122 @todo: move this into struct dhcp? */
sunyiming 1:6465a3f5c58a 123 u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
sunyiming 1:6465a3f5c58a 124 /** Holds a flag which option was received and is contained in dhcp_rx_options_val,
sunyiming 1:6465a3f5c58a 125 only valid while in dhcp_recv.
sunyiming 1:6465a3f5c58a 126 @todo: move this into struct dhcp? */
sunyiming 1:6465a3f5c58a 127 u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
sunyiming 1:6465a3f5c58a 128
sunyiming 1:6465a3f5c58a 129 #define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
sunyiming 1:6465a3f5c58a 130 #define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
sunyiming 1:6465a3f5c58a 131 #define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
sunyiming 1:6465a3f5c58a 132 #define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
sunyiming 1:6465a3f5c58a 133 #define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
sunyiming 1:6465a3f5c58a 134 #define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
sunyiming 1:6465a3f5c58a 135
sunyiming 1:6465a3f5c58a 136
sunyiming 1:6465a3f5c58a 137 /* DHCP client state machine functions */
sunyiming 1:6465a3f5c58a 138 static err_t dhcp_discover(struct netif *netif);
sunyiming 1:6465a3f5c58a 139 static err_t dhcp_select(struct netif *netif);
sunyiming 1:6465a3f5c58a 140 static void dhcp_bind(struct netif *netif);
sunyiming 1:6465a3f5c58a 141 #if DHCP_DOES_ARP_CHECK
sunyiming 1:6465a3f5c58a 142 static err_t dhcp_decline(struct netif *netif);
sunyiming 1:6465a3f5c58a 143 #endif /* DHCP_DOES_ARP_CHECK */
sunyiming 1:6465a3f5c58a 144 static err_t dhcp_rebind(struct netif *netif);
sunyiming 1:6465a3f5c58a 145 static err_t dhcp_reboot(struct netif *netif);
sunyiming 1:6465a3f5c58a 146 static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
sunyiming 1:6465a3f5c58a 147
sunyiming 1:6465a3f5c58a 148 /* receive, unfold, parse and free incoming messages */
sunyiming 1:6465a3f5c58a 149 static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
sunyiming 1:6465a3f5c58a 150
sunyiming 1:6465a3f5c58a 151 /* set the DHCP timers */
sunyiming 1:6465a3f5c58a 152 static void dhcp_timeout(struct netif *netif);
sunyiming 1:6465a3f5c58a 153 static void dhcp_t1_timeout(struct netif *netif);
sunyiming 1:6465a3f5c58a 154 static void dhcp_t2_timeout(struct netif *netif);
sunyiming 1:6465a3f5c58a 155
sunyiming 1:6465a3f5c58a 156 /* build outgoing messages */
sunyiming 1:6465a3f5c58a 157 /* create a DHCP message, fill in common headers */
sunyiming 1:6465a3f5c58a 158 static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
sunyiming 1:6465a3f5c58a 159 /* free a DHCP request */
sunyiming 1:6465a3f5c58a 160 static void dhcp_delete_msg(struct dhcp *dhcp);
sunyiming 1:6465a3f5c58a 161 /* add a DHCP option (type, then length in bytes) */
sunyiming 1:6465a3f5c58a 162 static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
sunyiming 1:6465a3f5c58a 163 /* add option values */
sunyiming 1:6465a3f5c58a 164 static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
sunyiming 1:6465a3f5c58a 165 static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
sunyiming 1:6465a3f5c58a 166 static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
sunyiming 1:6465a3f5c58a 167 /* always add the DHCP options trailer to end and pad */
sunyiming 1:6465a3f5c58a 168 static void dhcp_option_trailer(struct dhcp *dhcp);
sunyiming 1:6465a3f5c58a 169
sunyiming 1:6465a3f5c58a 170 /**
sunyiming 1:6465a3f5c58a 171 * Back-off the DHCP client (because of a received NAK response).
sunyiming 1:6465a3f5c58a 172 *
sunyiming 1:6465a3f5c58a 173 * Back-off the DHCP client because of a received NAK. Receiving a
sunyiming 1:6465a3f5c58a 174 * NAK means the client asked for something non-sensible, for
sunyiming 1:6465a3f5c58a 175 * example when it tries to renew a lease obtained on another network.
sunyiming 1:6465a3f5c58a 176 *
sunyiming 1:6465a3f5c58a 177 * We clear any existing set IP address and restart DHCP negotiation
sunyiming 1:6465a3f5c58a 178 * afresh (as per RFC2131 3.2.3).
sunyiming 1:6465a3f5c58a 179 *
sunyiming 1:6465a3f5c58a 180 * @param netif the netif under DHCP control
sunyiming 1:6465a3f5c58a 181 */
sunyiming 1:6465a3f5c58a 182 static void
sunyiming 1:6465a3f5c58a 183 dhcp_handle_nak(struct netif *netif)
sunyiming 1:6465a3f5c58a 184 {
sunyiming 1:6465a3f5c58a 185 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 186 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
sunyiming 1:6465a3f5c58a 187 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
sunyiming 1:6465a3f5c58a 188 /* Set the interface down since the address must no longer be used, as per RFC2131 */
sunyiming 1:6465a3f5c58a 189 netif_set_down(netif);
sunyiming 1:6465a3f5c58a 190 /* remove IP address from interface */
sunyiming 1:6465a3f5c58a 191 netif_set_ipaddr(netif, IP_ADDR_ANY);
sunyiming 1:6465a3f5c58a 192 netif_set_gw(netif, IP_ADDR_ANY);
sunyiming 1:6465a3f5c58a 193 netif_set_netmask(netif, IP_ADDR_ANY);
sunyiming 1:6465a3f5c58a 194 /* Change to a defined state */
sunyiming 1:6465a3f5c58a 195 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
sunyiming 1:6465a3f5c58a 196 /* We can immediately restart discovery */
sunyiming 1:6465a3f5c58a 197 dhcp_discover(netif);
sunyiming 1:6465a3f5c58a 198 }
sunyiming 1:6465a3f5c58a 199
sunyiming 1:6465a3f5c58a 200 #if DHCP_DOES_ARP_CHECK
sunyiming 1:6465a3f5c58a 201 /**
sunyiming 1:6465a3f5c58a 202 * Checks if the offered IP address is already in use.
sunyiming 1:6465a3f5c58a 203 *
sunyiming 1:6465a3f5c58a 204 * It does so by sending an ARP request for the offered address and
sunyiming 1:6465a3f5c58a 205 * entering CHECKING state. If no ARP reply is received within a small
sunyiming 1:6465a3f5c58a 206 * interval, the address is assumed to be free for use by us.
sunyiming 1:6465a3f5c58a 207 *
sunyiming 1:6465a3f5c58a 208 * @param netif the netif under DHCP control
sunyiming 1:6465a3f5c58a 209 */
sunyiming 1:6465a3f5c58a 210 static void
sunyiming 1:6465a3f5c58a 211 dhcp_check(struct netif *netif)
sunyiming 1:6465a3f5c58a 212 {
sunyiming 1:6465a3f5c58a 213 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 214 err_t result;
sunyiming 1:6465a3f5c58a 215 u16_t msecs;
sunyiming 1:6465a3f5c58a 216 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
sunyiming 1:6465a3f5c58a 217 (s16_t)netif->name[1]));
sunyiming 1:6465a3f5c58a 218 dhcp_set_state(dhcp, DHCP_CHECKING);
sunyiming 1:6465a3f5c58a 219 /* create an ARP query for the offered IP address, expecting that no host
sunyiming 1:6465a3f5c58a 220 responds, as the IP address should not be in use. */
sunyiming 1:6465a3f5c58a 221 result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
sunyiming 1:6465a3f5c58a 222 if (result != ERR_OK) {
sunyiming 1:6465a3f5c58a 223 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
sunyiming 1:6465a3f5c58a 224 }
sunyiming 1:6465a3f5c58a 225 dhcp->tries++;
sunyiming 1:6465a3f5c58a 226 msecs = 500;
sunyiming 1:6465a3f5c58a 227 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
sunyiming 1:6465a3f5c58a 228 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
sunyiming 1:6465a3f5c58a 229 }
sunyiming 1:6465a3f5c58a 230 #endif /* DHCP_DOES_ARP_CHECK */
sunyiming 1:6465a3f5c58a 231
sunyiming 1:6465a3f5c58a 232 /**
sunyiming 1:6465a3f5c58a 233 * Remember the configuration offered by a DHCP server.
sunyiming 1:6465a3f5c58a 234 *
sunyiming 1:6465a3f5c58a 235 * @param netif the netif under DHCP control
sunyiming 1:6465a3f5c58a 236 */
sunyiming 1:6465a3f5c58a 237 static void
sunyiming 1:6465a3f5c58a 238 dhcp_handle_offer(struct netif *netif)
sunyiming 1:6465a3f5c58a 239 {
sunyiming 1:6465a3f5c58a 240 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 241 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
sunyiming 1:6465a3f5c58a 242 (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
sunyiming 1:6465a3f5c58a 243 /* obtain the server address */
sunyiming 1:6465a3f5c58a 244 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
sunyiming 1:6465a3f5c58a 245 ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
sunyiming 1:6465a3f5c58a 246 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
sunyiming 1:6465a3f5c58a 247 ip4_addr_get_u32(&dhcp->server_ip_addr)));
sunyiming 1:6465a3f5c58a 248 /* remember offered address */
sunyiming 1:6465a3f5c58a 249 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
sunyiming 1:6465a3f5c58a 250 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
sunyiming 1:6465a3f5c58a 251 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
sunyiming 1:6465a3f5c58a 252
sunyiming 1:6465a3f5c58a 253 dhcp_select(netif);
sunyiming 1:6465a3f5c58a 254 } else {
sunyiming 1:6465a3f5c58a 255 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
sunyiming 1:6465a3f5c58a 256 ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
sunyiming 1:6465a3f5c58a 257 }
sunyiming 1:6465a3f5c58a 258 }
sunyiming 1:6465a3f5c58a 259
sunyiming 1:6465a3f5c58a 260 /**
sunyiming 1:6465a3f5c58a 261 * Select a DHCP server offer out of all offers.
sunyiming 1:6465a3f5c58a 262 *
sunyiming 1:6465a3f5c58a 263 * Simply select the first offer received.
sunyiming 1:6465a3f5c58a 264 *
sunyiming 1:6465a3f5c58a 265 * @param netif the netif under DHCP control
sunyiming 1:6465a3f5c58a 266 * @return lwIP specific error (see error.h)
sunyiming 1:6465a3f5c58a 267 */
sunyiming 1:6465a3f5c58a 268 static err_t
sunyiming 1:6465a3f5c58a 269 dhcp_select(struct netif *netif)
sunyiming 1:6465a3f5c58a 270 {
sunyiming 1:6465a3f5c58a 271 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 272 err_t result;
sunyiming 1:6465a3f5c58a 273 u16_t msecs;
sunyiming 1:6465a3f5c58a 274
sunyiming 1:6465a3f5c58a 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));
sunyiming 1:6465a3f5c58a 276 dhcp_set_state(dhcp, DHCP_REQUESTING);
sunyiming 1:6465a3f5c58a 277
sunyiming 1:6465a3f5c58a 278 /* create and initialize the DHCP message header */
sunyiming 1:6465a3f5c58a 279 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
sunyiming 1:6465a3f5c58a 280 if (result == ERR_OK) {
sunyiming 1:6465a3f5c58a 281 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
sunyiming 1:6465a3f5c58a 282 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
sunyiming 1:6465a3f5c58a 283
sunyiming 1:6465a3f5c58a 284 /* MUST request the offered IP address */
sunyiming 1:6465a3f5c58a 285 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
sunyiming 1:6465a3f5c58a 286 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
sunyiming 1:6465a3f5c58a 287
sunyiming 1:6465a3f5c58a 288 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
sunyiming 1:6465a3f5c58a 289 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
sunyiming 1:6465a3f5c58a 290
sunyiming 1:6465a3f5c58a 291 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
sunyiming 1:6465a3f5c58a 292 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
sunyiming 1:6465a3f5c58a 293 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
sunyiming 1:6465a3f5c58a 294 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
sunyiming 1:6465a3f5c58a 295 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
sunyiming 1:6465a3f5c58a 296
sunyiming 1:6465a3f5c58a 297 #if LWIP_NETIF_HOSTNAME
sunyiming 1:6465a3f5c58a 298 if (netif->hostname != NULL) {
sunyiming 1:6465a3f5c58a 299 const char *p = (const char*)netif->hostname;
sunyiming 1:6465a3f5c58a 300 u8_t namelen = (u8_t)strlen(p);
sunyiming 1:6465a3f5c58a 301 if (namelen > 0) {
sunyiming 1:6465a3f5c58a 302 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
sunyiming 1:6465a3f5c58a 303 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
sunyiming 1:6465a3f5c58a 304 while (*p) {
sunyiming 1:6465a3f5c58a 305 dhcp_option_byte(dhcp, *p++);
sunyiming 1:6465a3f5c58a 306 }
sunyiming 1:6465a3f5c58a 307 }
sunyiming 1:6465a3f5c58a 308 }
sunyiming 1:6465a3f5c58a 309 #endif /* LWIP_NETIF_HOSTNAME */
sunyiming 1:6465a3f5c58a 310
sunyiming 1:6465a3f5c58a 311 dhcp_option_trailer(dhcp);
sunyiming 1:6465a3f5c58a 312 /* shrink the pbuf to the actual content length */
sunyiming 1:6465a3f5c58a 313 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
sunyiming 1:6465a3f5c58a 314
sunyiming 1:6465a3f5c58a 315 /* send broadcast to any DHCP server */
sunyiming 1:6465a3f5c58a 316 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
sunyiming 1:6465a3f5c58a 317 dhcp_delete_msg(dhcp);
sunyiming 1:6465a3f5c58a 318 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
sunyiming 1:6465a3f5c58a 319 } else {
sunyiming 1:6465a3f5c58a 320 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
sunyiming 1:6465a3f5c58a 321 }
sunyiming 1:6465a3f5c58a 322 dhcp->tries++;
sunyiming 1:6465a3f5c58a 323 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
sunyiming 1:6465a3f5c58a 324 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
sunyiming 1:6465a3f5c58a 325 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
sunyiming 1:6465a3f5c58a 326 return result;
sunyiming 1:6465a3f5c58a 327 }
sunyiming 1:6465a3f5c58a 328
sunyiming 1:6465a3f5c58a 329 /**
sunyiming 1:6465a3f5c58a 330 * The DHCP timer that checks for lease renewal/rebind timeouts.
sunyiming 1:6465a3f5c58a 331 */
sunyiming 1:6465a3f5c58a 332 void
sunyiming 1:6465a3f5c58a 333 dhcp_coarse_tmr()
sunyiming 1:6465a3f5c58a 334 {
sunyiming 1:6465a3f5c58a 335 struct netif *netif = netif_list;
sunyiming 1:6465a3f5c58a 336 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
sunyiming 1:6465a3f5c58a 337 /* iterate through all network interfaces */
sunyiming 1:6465a3f5c58a 338 while (netif != NULL) {
sunyiming 1:6465a3f5c58a 339 /* only act on DHCP configured interfaces */
sunyiming 1:6465a3f5c58a 340 if (netif->dhcp != NULL) {
sunyiming 1:6465a3f5c58a 341 /* timer is active (non zero), and triggers (zeroes) now? */
sunyiming 1:6465a3f5c58a 342 if (netif->dhcp->t2_timeout-- == 1) {
sunyiming 1:6465a3f5c58a 343 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
sunyiming 1:6465a3f5c58a 344 /* this clients' rebind timeout triggered */
sunyiming 1:6465a3f5c58a 345 dhcp_t2_timeout(netif);
sunyiming 1:6465a3f5c58a 346 /* timer is active (non zero), and triggers (zeroes) now */
sunyiming 1:6465a3f5c58a 347 } else if (netif->dhcp->t1_timeout-- == 1) {
sunyiming 1:6465a3f5c58a 348 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
sunyiming 1:6465a3f5c58a 349 /* this clients' renewal timeout triggered */
sunyiming 1:6465a3f5c58a 350 dhcp_t1_timeout(netif);
sunyiming 1:6465a3f5c58a 351 }
sunyiming 1:6465a3f5c58a 352 }
sunyiming 1:6465a3f5c58a 353 /* proceed to next netif */
sunyiming 1:6465a3f5c58a 354 netif = netif->next;
sunyiming 1:6465a3f5c58a 355 }
sunyiming 1:6465a3f5c58a 356 }
sunyiming 1:6465a3f5c58a 357
sunyiming 1:6465a3f5c58a 358 /**
sunyiming 1:6465a3f5c58a 359 * DHCP transaction timeout handling
sunyiming 1:6465a3f5c58a 360 *
sunyiming 1:6465a3f5c58a 361 * A DHCP server is expected to respond within a short period of time.
sunyiming 1:6465a3f5c58a 362 * This timer checks whether an outstanding DHCP request is timed out.
sunyiming 1:6465a3f5c58a 363 */
sunyiming 1:6465a3f5c58a 364 void
sunyiming 1:6465a3f5c58a 365 dhcp_fine_tmr()
sunyiming 1:6465a3f5c58a 366 {
sunyiming 1:6465a3f5c58a 367 struct netif *netif = netif_list;
sunyiming 1:6465a3f5c58a 368 /* loop through netif's */
sunyiming 1:6465a3f5c58a 369 while (netif != NULL) {
sunyiming 1:6465a3f5c58a 370 /* only act on DHCP configured interfaces */
sunyiming 1:6465a3f5c58a 371 if (netif->dhcp != NULL) {
sunyiming 1:6465a3f5c58a 372 /* timer is active (non zero), and is about to trigger now */
sunyiming 1:6465a3f5c58a 373 if (netif->dhcp->request_timeout > 1) {
sunyiming 1:6465a3f5c58a 374 netif->dhcp->request_timeout--;
sunyiming 1:6465a3f5c58a 375 }
sunyiming 1:6465a3f5c58a 376 else if (netif->dhcp->request_timeout == 1) {
sunyiming 1:6465a3f5c58a 377 netif->dhcp->request_timeout--;
sunyiming 1:6465a3f5c58a 378 /* { netif->dhcp->request_timeout == 0 } */
sunyiming 1:6465a3f5c58a 379 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
sunyiming 1:6465a3f5c58a 380 /* this client's request timeout triggered */
sunyiming 1:6465a3f5c58a 381 dhcp_timeout(netif);
sunyiming 1:6465a3f5c58a 382 }
sunyiming 1:6465a3f5c58a 383 }
sunyiming 1:6465a3f5c58a 384 /* proceed to next network interface */
sunyiming 1:6465a3f5c58a 385 netif = netif->next;
sunyiming 1:6465a3f5c58a 386 }
sunyiming 1:6465a3f5c58a 387 }
sunyiming 1:6465a3f5c58a 388
sunyiming 1:6465a3f5c58a 389 /**
sunyiming 1:6465a3f5c58a 390 * A DHCP negotiation transaction, or ARP request, has timed out.
sunyiming 1:6465a3f5c58a 391 *
sunyiming 1:6465a3f5c58a 392 * The timer that was started with the DHCP or ARP request has
sunyiming 1:6465a3f5c58a 393 * timed out, indicating no response was received in time.
sunyiming 1:6465a3f5c58a 394 *
sunyiming 1:6465a3f5c58a 395 * @param netif the netif under DHCP control
sunyiming 1:6465a3f5c58a 396 */
sunyiming 1:6465a3f5c58a 397 static void
sunyiming 1:6465a3f5c58a 398 dhcp_timeout(struct netif *netif)
sunyiming 1:6465a3f5c58a 399 {
sunyiming 1:6465a3f5c58a 400 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 401 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
sunyiming 1:6465a3f5c58a 402 /* back-off period has passed, or server selection timed out */
sunyiming 1:6465a3f5c58a 403 if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
sunyiming 1:6465a3f5c58a 404 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
sunyiming 1:6465a3f5c58a 405 dhcp_discover(netif);
sunyiming 1:6465a3f5c58a 406 /* receiving the requested lease timed out */
sunyiming 1:6465a3f5c58a 407 } else if (dhcp->state == DHCP_REQUESTING) {
sunyiming 1:6465a3f5c58a 408 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
sunyiming 1:6465a3f5c58a 409 if (dhcp->tries <= 5) {
sunyiming 1:6465a3f5c58a 410 dhcp_select(netif);
sunyiming 1:6465a3f5c58a 411 } else {
sunyiming 1:6465a3f5c58a 412 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
sunyiming 1:6465a3f5c58a 413 dhcp_release(netif);
sunyiming 1:6465a3f5c58a 414 dhcp_discover(netif);
sunyiming 1:6465a3f5c58a 415 }
sunyiming 1:6465a3f5c58a 416 #if DHCP_DOES_ARP_CHECK
sunyiming 1:6465a3f5c58a 417 /* received no ARP reply for the offered address (which is good) */
sunyiming 1:6465a3f5c58a 418 } else if (dhcp->state == DHCP_CHECKING) {
sunyiming 1:6465a3f5c58a 419 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
sunyiming 1:6465a3f5c58a 420 if (dhcp->tries <= 1) {
sunyiming 1:6465a3f5c58a 421 dhcp_check(netif);
sunyiming 1:6465a3f5c58a 422 /* no ARP replies on the offered address,
sunyiming 1:6465a3f5c58a 423 looks like the IP address is indeed free */
sunyiming 1:6465a3f5c58a 424 } else {
sunyiming 1:6465a3f5c58a 425 /* bind the interface to the offered address */
sunyiming 1:6465a3f5c58a 426 dhcp_bind(netif);
sunyiming 1:6465a3f5c58a 427 }
sunyiming 1:6465a3f5c58a 428 #endif /* DHCP_DOES_ARP_CHECK */
sunyiming 1:6465a3f5c58a 429 }
sunyiming 1:6465a3f5c58a 430 /* did not get response to renew request? */
sunyiming 1:6465a3f5c58a 431 else if (dhcp->state == DHCP_RENEWING) {
sunyiming 1:6465a3f5c58a 432 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
sunyiming 1:6465a3f5c58a 433 /* just retry renewal */
sunyiming 1:6465a3f5c58a 434 /* note that the rebind timer will eventually time-out if renew does not work */
sunyiming 1:6465a3f5c58a 435 dhcp_renew(netif);
sunyiming 1:6465a3f5c58a 436 /* did not get response to rebind request? */
sunyiming 1:6465a3f5c58a 437 } else if (dhcp->state == DHCP_REBINDING) {
sunyiming 1:6465a3f5c58a 438 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
sunyiming 1:6465a3f5c58a 439 if (dhcp->tries <= 8) {
sunyiming 1:6465a3f5c58a 440 dhcp_rebind(netif);
sunyiming 1:6465a3f5c58a 441 } else {
sunyiming 1:6465a3f5c58a 442 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
sunyiming 1:6465a3f5c58a 443 dhcp_release(netif);
sunyiming 1:6465a3f5c58a 444 dhcp_discover(netif);
sunyiming 1:6465a3f5c58a 445 }
sunyiming 1:6465a3f5c58a 446 } else if (dhcp->state == DHCP_REBOOTING) {
sunyiming 1:6465a3f5c58a 447 if (dhcp->tries < REBOOT_TRIES) {
sunyiming 1:6465a3f5c58a 448 dhcp_reboot(netif);
sunyiming 1:6465a3f5c58a 449 } else {
sunyiming 1:6465a3f5c58a 450 dhcp_discover(netif);
sunyiming 1:6465a3f5c58a 451 }
sunyiming 1:6465a3f5c58a 452 }
sunyiming 1:6465a3f5c58a 453 }
sunyiming 1:6465a3f5c58a 454
sunyiming 1:6465a3f5c58a 455 /**
sunyiming 1:6465a3f5c58a 456 * The renewal period has timed out.
sunyiming 1:6465a3f5c58a 457 *
sunyiming 1:6465a3f5c58a 458 * @param netif the netif under DHCP control
sunyiming 1:6465a3f5c58a 459 */
sunyiming 1:6465a3f5c58a 460 static void
sunyiming 1:6465a3f5c58a 461 dhcp_t1_timeout(struct netif *netif)
sunyiming 1:6465a3f5c58a 462 {
sunyiming 1:6465a3f5c58a 463 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 464 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
sunyiming 1:6465a3f5c58a 465 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
sunyiming 1:6465a3f5c58a 466 (dhcp->state == DHCP_RENEWING)) {
sunyiming 1:6465a3f5c58a 467 /* just retry to renew - note that the rebind timer (t2) will
sunyiming 1:6465a3f5c58a 468 * eventually time-out if renew tries fail. */
sunyiming 1:6465a3f5c58a 469 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
sunyiming 1:6465a3f5c58a 470 ("dhcp_t1_timeout(): must renew\n"));
sunyiming 1:6465a3f5c58a 471 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
sunyiming 1:6465a3f5c58a 472 DHCP_RENEWING, not DHCP_BOUND */
sunyiming 1:6465a3f5c58a 473 dhcp_renew(netif);
sunyiming 1:6465a3f5c58a 474 }
sunyiming 1:6465a3f5c58a 475 }
sunyiming 1:6465a3f5c58a 476
sunyiming 1:6465a3f5c58a 477 /**
sunyiming 1:6465a3f5c58a 478 * The rebind period has timed out.
sunyiming 1:6465a3f5c58a 479 *
sunyiming 1:6465a3f5c58a 480 * @param netif the netif under DHCP control
sunyiming 1:6465a3f5c58a 481 */
sunyiming 1:6465a3f5c58a 482 static void
sunyiming 1:6465a3f5c58a 483 dhcp_t2_timeout(struct netif *netif)
sunyiming 1:6465a3f5c58a 484 {
sunyiming 1:6465a3f5c58a 485 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 486 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
sunyiming 1:6465a3f5c58a 487 if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
sunyiming 1:6465a3f5c58a 488 (dhcp->state == DHCP_RENEWING)) {
sunyiming 1:6465a3f5c58a 489 /* just retry to rebind */
sunyiming 1:6465a3f5c58a 490 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
sunyiming 1:6465a3f5c58a 491 ("dhcp_t2_timeout(): must rebind\n"));
sunyiming 1:6465a3f5c58a 492 /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
sunyiming 1:6465a3f5c58a 493 DHCP_REBINDING, not DHCP_BOUND */
sunyiming 1:6465a3f5c58a 494 dhcp_rebind(netif);
sunyiming 1:6465a3f5c58a 495 }
sunyiming 1:6465a3f5c58a 496 }
sunyiming 1:6465a3f5c58a 497
sunyiming 1:6465a3f5c58a 498 /**
sunyiming 1:6465a3f5c58a 499 * Handle a DHCP ACK packet
sunyiming 1:6465a3f5c58a 500 *
sunyiming 1:6465a3f5c58a 501 * @param netif the netif under DHCP control
sunyiming 1:6465a3f5c58a 502 */
sunyiming 1:6465a3f5c58a 503 static void
sunyiming 1:6465a3f5c58a 504 dhcp_handle_ack(struct netif *netif)
sunyiming 1:6465a3f5c58a 505 {
sunyiming 1:6465a3f5c58a 506 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 507 #if LWIP_DNS
sunyiming 1:6465a3f5c58a 508 u8_t n;
sunyiming 1:6465a3f5c58a 509 #endif /* LWIP_DNS */
sunyiming 1:6465a3f5c58a 510
sunyiming 1:6465a3f5c58a 511 /* clear options we might not get from the ACK */
sunyiming 1:6465a3f5c58a 512 ip_addr_set_zero(&dhcp->offered_sn_mask);
sunyiming 1:6465a3f5c58a 513 ip_addr_set_zero(&dhcp->offered_gw_addr);
sunyiming 1:6465a3f5c58a 514 #if LWIP_DHCP_BOOTP_FILE
sunyiming 1:6465a3f5c58a 515 ip_addr_set_zero(&dhcp->offered_si_addr);
sunyiming 1:6465a3f5c58a 516 #endif /* LWIP_DHCP_BOOTP_FILE */
sunyiming 1:6465a3f5c58a 517
sunyiming 1:6465a3f5c58a 518 /* lease time given? */
sunyiming 1:6465a3f5c58a 519 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
sunyiming 1:6465a3f5c58a 520 /* remember offered lease time */
sunyiming 1:6465a3f5c58a 521 dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
sunyiming 1:6465a3f5c58a 522 }
sunyiming 1:6465a3f5c58a 523 /* renewal period given? */
sunyiming 1:6465a3f5c58a 524 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
sunyiming 1:6465a3f5c58a 525 /* remember given renewal period */
sunyiming 1:6465a3f5c58a 526 dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
sunyiming 1:6465a3f5c58a 527 } else {
sunyiming 1:6465a3f5c58a 528 /* calculate safe periods for renewal */
sunyiming 1:6465a3f5c58a 529 dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
sunyiming 1:6465a3f5c58a 530 }
sunyiming 1:6465a3f5c58a 531
sunyiming 1:6465a3f5c58a 532 /* renewal period given? */
sunyiming 1:6465a3f5c58a 533 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
sunyiming 1:6465a3f5c58a 534 /* remember given rebind period */
sunyiming 1:6465a3f5c58a 535 dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
sunyiming 1:6465a3f5c58a 536 } else {
sunyiming 1:6465a3f5c58a 537 /* calculate safe periods for rebinding */
sunyiming 1:6465a3f5c58a 538 dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
sunyiming 1:6465a3f5c58a 539 }
sunyiming 1:6465a3f5c58a 540
sunyiming 1:6465a3f5c58a 541 /* (y)our internet address */
sunyiming 1:6465a3f5c58a 542 ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
sunyiming 1:6465a3f5c58a 543
sunyiming 1:6465a3f5c58a 544 #if LWIP_DHCP_BOOTP_FILE
sunyiming 1:6465a3f5c58a 545 /* copy boot server address,
sunyiming 1:6465a3f5c58a 546 boot file name copied in dhcp_parse_reply if not overloaded */
sunyiming 1:6465a3f5c58a 547 ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
sunyiming 1:6465a3f5c58a 548 #endif /* LWIP_DHCP_BOOTP_FILE */
sunyiming 1:6465a3f5c58a 549
sunyiming 1:6465a3f5c58a 550 /* subnet mask given? */
sunyiming 1:6465a3f5c58a 551 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
sunyiming 1:6465a3f5c58a 552 /* remember given subnet mask */
sunyiming 1:6465a3f5c58a 553 ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
sunyiming 1:6465a3f5c58a 554 dhcp->subnet_mask_given = 1;
sunyiming 1:6465a3f5c58a 555 } else {
sunyiming 1:6465a3f5c58a 556 dhcp->subnet_mask_given = 0;
sunyiming 1:6465a3f5c58a 557 }
sunyiming 1:6465a3f5c58a 558
sunyiming 1:6465a3f5c58a 559 /* gateway router */
sunyiming 1:6465a3f5c58a 560 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
sunyiming 1:6465a3f5c58a 561 ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
sunyiming 1:6465a3f5c58a 562 }
sunyiming 1:6465a3f5c58a 563
sunyiming 1:6465a3f5c58a 564 #if LWIP_DNS
sunyiming 1:6465a3f5c58a 565 /* DNS servers */
sunyiming 1:6465a3f5c58a 566 n = 0;
sunyiming 1:6465a3f5c58a 567 while((n < DNS_MAX_SERVERS) && dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)) {
sunyiming 1:6465a3f5c58a 568 ip_addr_t dns_addr;
sunyiming 1:6465a3f5c58a 569 ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
sunyiming 1:6465a3f5c58a 570 dns_setserver(n, &dns_addr);
sunyiming 1:6465a3f5c58a 571 n++;
sunyiming 1:6465a3f5c58a 572 }
sunyiming 1:6465a3f5c58a 573 #endif /* LWIP_DNS */
sunyiming 1:6465a3f5c58a 574 }
sunyiming 1:6465a3f5c58a 575
sunyiming 1:6465a3f5c58a 576 /** Set a statically allocated struct dhcp to work with.
sunyiming 1:6465a3f5c58a 577 * Using this prevents dhcp_start to allocate it using mem_malloc.
sunyiming 1:6465a3f5c58a 578 *
sunyiming 1:6465a3f5c58a 579 * @param netif the netif for which to set the struct dhcp
sunyiming 1:6465a3f5c58a 580 * @param dhcp (uninitialised) dhcp struct allocated by the application
sunyiming 1:6465a3f5c58a 581 */
sunyiming 1:6465a3f5c58a 582 void
sunyiming 1:6465a3f5c58a 583 dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
sunyiming 1:6465a3f5c58a 584 {
sunyiming 1:6465a3f5c58a 585 LWIP_ASSERT("netif != NULL", netif != NULL);
sunyiming 1:6465a3f5c58a 586 LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
sunyiming 1:6465a3f5c58a 587 LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
sunyiming 1:6465a3f5c58a 588
sunyiming 1:6465a3f5c58a 589 /* clear data structure */
sunyiming 1:6465a3f5c58a 590 memset(dhcp, 0, sizeof(struct dhcp));
sunyiming 1:6465a3f5c58a 591 /* dhcp_set_state(&dhcp, DHCP_OFF); */
sunyiming 1:6465a3f5c58a 592 netif->dhcp = dhcp;
sunyiming 1:6465a3f5c58a 593 }
sunyiming 1:6465a3f5c58a 594
sunyiming 1:6465a3f5c58a 595 /** Removes a struct dhcp from a netif.
sunyiming 1:6465a3f5c58a 596 *
sunyiming 1:6465a3f5c58a 597 * ATTENTION: Only use this when not using dhcp_set_struct() to allocate the
sunyiming 1:6465a3f5c58a 598 * struct dhcp since the memory is passed back to the heap.
sunyiming 1:6465a3f5c58a 599 *
sunyiming 1:6465a3f5c58a 600 * @param netif the netif from which to remove the struct dhcp
sunyiming 1:6465a3f5c58a 601 */
sunyiming 1:6465a3f5c58a 602 void dhcp_cleanup(struct netif *netif)
sunyiming 1:6465a3f5c58a 603 {
sunyiming 1:6465a3f5c58a 604 LWIP_ASSERT("netif != NULL", netif != NULL);
sunyiming 1:6465a3f5c58a 605
sunyiming 1:6465a3f5c58a 606 if (netif->dhcp != NULL) {
sunyiming 1:6465a3f5c58a 607 mem_free(netif->dhcp);
sunyiming 1:6465a3f5c58a 608 netif->dhcp = NULL;
sunyiming 1:6465a3f5c58a 609 }
sunyiming 1:6465a3f5c58a 610 }
sunyiming 1:6465a3f5c58a 611
sunyiming 1:6465a3f5c58a 612 /**
sunyiming 1:6465a3f5c58a 613 * Start DHCP negotiation for a network interface.
sunyiming 1:6465a3f5c58a 614 *
sunyiming 1:6465a3f5c58a 615 * If no DHCP client instance was attached to this interface,
sunyiming 1:6465a3f5c58a 616 * a new client is created first. If a DHCP client instance
sunyiming 1:6465a3f5c58a 617 * was already present, it restarts negotiation.
sunyiming 1:6465a3f5c58a 618 *
sunyiming 1:6465a3f5c58a 619 * @param netif The lwIP network interface
sunyiming 1:6465a3f5c58a 620 * @return lwIP error code
sunyiming 1:6465a3f5c58a 621 * - ERR_OK - No error
sunyiming 1:6465a3f5c58a 622 * - ERR_MEM - Out of memory
sunyiming 1:6465a3f5c58a 623 */
sunyiming 1:6465a3f5c58a 624 err_t
sunyiming 1:6465a3f5c58a 625 dhcp_start(struct netif *netif)
sunyiming 1:6465a3f5c58a 626 {
sunyiming 1:6465a3f5c58a 627 struct dhcp *dhcp;
sunyiming 1:6465a3f5c58a 628 err_t result = ERR_OK;
sunyiming 1:6465a3f5c58a 629
sunyiming 1:6465a3f5c58a 630 LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
sunyiming 1:6465a3f5c58a 631 dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 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));
sunyiming 1:6465a3f5c58a 633 /* Remove the flag that says this netif is handled by DHCP,
sunyiming 1:6465a3f5c58a 634 it is set when we succeeded starting. */
sunyiming 1:6465a3f5c58a 635 netif->flags &= ~NETIF_FLAG_DHCP;
sunyiming 1:6465a3f5c58a 636
sunyiming 1:6465a3f5c58a 637 /* check hwtype of the netif */
sunyiming 1:6465a3f5c58a 638 if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
sunyiming 1:6465a3f5c58a 639 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
sunyiming 1:6465a3f5c58a 640 return ERR_ARG;
sunyiming 1:6465a3f5c58a 641 }
sunyiming 1:6465a3f5c58a 642
sunyiming 1:6465a3f5c58a 643 /* check MTU of the netif */
sunyiming 1:6465a3f5c58a 644 if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
sunyiming 1:6465a3f5c58a 645 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
sunyiming 1:6465a3f5c58a 646 return ERR_MEM;
sunyiming 1:6465a3f5c58a 647 }
sunyiming 1:6465a3f5c58a 648
sunyiming 1:6465a3f5c58a 649 /* no DHCP client attached yet? */
sunyiming 1:6465a3f5c58a 650 if (dhcp == NULL) {
sunyiming 1:6465a3f5c58a 651 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
sunyiming 1:6465a3f5c58a 652 dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
sunyiming 1:6465a3f5c58a 653 if (dhcp == NULL) {
sunyiming 1:6465a3f5c58a 654 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
sunyiming 1:6465a3f5c58a 655 return ERR_MEM;
sunyiming 1:6465a3f5c58a 656 }
sunyiming 1:6465a3f5c58a 657 /* store this dhcp client in the netif */
sunyiming 1:6465a3f5c58a 658 netif->dhcp = dhcp;
sunyiming 1:6465a3f5c58a 659 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
sunyiming 1:6465a3f5c58a 660 /* already has DHCP client attached */
sunyiming 1:6465a3f5c58a 661 } else {
sunyiming 1:6465a3f5c58a 662 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
sunyiming 1:6465a3f5c58a 663 if (dhcp->pcb != NULL) {
sunyiming 1:6465a3f5c58a 664 udp_remove(dhcp->pcb);
sunyiming 1:6465a3f5c58a 665 }
sunyiming 1:6465a3f5c58a 666 LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
sunyiming 1:6465a3f5c58a 667 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
sunyiming 1:6465a3f5c58a 668 }
sunyiming 1:6465a3f5c58a 669
sunyiming 1:6465a3f5c58a 670 /* clear data structure */
sunyiming 1:6465a3f5c58a 671 memset(dhcp, 0, sizeof(struct dhcp));
sunyiming 1:6465a3f5c58a 672 /* dhcp_set_state(&dhcp, DHCP_OFF); */
sunyiming 1:6465a3f5c58a 673 /* allocate UDP PCB */
sunyiming 1:6465a3f5c58a 674 dhcp->pcb = udp_new();
sunyiming 1:6465a3f5c58a 675 if (dhcp->pcb == NULL) {
sunyiming 1:6465a3f5c58a 676 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
sunyiming 1:6465a3f5c58a 677 return ERR_MEM;
sunyiming 1:6465a3f5c58a 678 }
sunyiming 1:6465a3f5c58a 679 dhcp->pcb->so_options |= SOF_BROADCAST;
sunyiming 1:6465a3f5c58a 680 /* set up local and remote port for the pcb */
sunyiming 1:6465a3f5c58a 681 udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
sunyiming 1:6465a3f5c58a 682 udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
sunyiming 1:6465a3f5c58a 683 /* set up the recv callback and argument */
sunyiming 1:6465a3f5c58a 684 udp_recv(dhcp->pcb, dhcp_recv, netif);
sunyiming 1:6465a3f5c58a 685 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
sunyiming 1:6465a3f5c58a 686 /* (re)start the DHCP negotiation */
sunyiming 1:6465a3f5c58a 687 result = dhcp_discover(netif);
sunyiming 1:6465a3f5c58a 688 if (result != ERR_OK) {
sunyiming 1:6465a3f5c58a 689 /* free resources allocated above */
sunyiming 1:6465a3f5c58a 690 dhcp_stop(netif);
sunyiming 1:6465a3f5c58a 691 return ERR_MEM;
sunyiming 1:6465a3f5c58a 692 }
sunyiming 1:6465a3f5c58a 693 /* Set the flag that says this netif is handled by DHCP. */
sunyiming 1:6465a3f5c58a 694 netif->flags |= NETIF_FLAG_DHCP;
sunyiming 1:6465a3f5c58a 695 return result;
sunyiming 1:6465a3f5c58a 696 }
sunyiming 1:6465a3f5c58a 697
sunyiming 1:6465a3f5c58a 698 /**
sunyiming 1:6465a3f5c58a 699 * Inform a DHCP server of our manual configuration.
sunyiming 1:6465a3f5c58a 700 *
sunyiming 1:6465a3f5c58a 701 * This informs DHCP servers of our fixed IP address configuration
sunyiming 1:6465a3f5c58a 702 * by sending an INFORM message. It does not involve DHCP address
sunyiming 1:6465a3f5c58a 703 * configuration, it is just here to be nice to the network.
sunyiming 1:6465a3f5c58a 704 *
sunyiming 1:6465a3f5c58a 705 * @param netif The lwIP network interface
sunyiming 1:6465a3f5c58a 706 */
sunyiming 1:6465a3f5c58a 707 void
sunyiming 1:6465a3f5c58a 708 dhcp_inform(struct netif *netif)
sunyiming 1:6465a3f5c58a 709 {
sunyiming 1:6465a3f5c58a 710 struct dhcp dhcp;
sunyiming 1:6465a3f5c58a 711 err_t result = ERR_OK;
sunyiming 1:6465a3f5c58a 712 struct udp_pcb *pcb;
sunyiming 1:6465a3f5c58a 713
sunyiming 1:6465a3f5c58a 714 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
sunyiming 1:6465a3f5c58a 715
sunyiming 1:6465a3f5c58a 716 memset(&dhcp, 0, sizeof(struct dhcp));
sunyiming 1:6465a3f5c58a 717 dhcp_set_state(&dhcp, DHCP_INFORM);
sunyiming 1:6465a3f5c58a 718
sunyiming 1:6465a3f5c58a 719 if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
sunyiming 1:6465a3f5c58a 720 /* re-use existing pcb */
sunyiming 1:6465a3f5c58a 721 pcb = netif->dhcp->pcb;
sunyiming 1:6465a3f5c58a 722 } else {
sunyiming 1:6465a3f5c58a 723 pcb = udp_new();
sunyiming 1:6465a3f5c58a 724 if (pcb == NULL) {
sunyiming 1:6465a3f5c58a 725 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
sunyiming 1:6465a3f5c58a 726 return;
sunyiming 1:6465a3f5c58a 727 }
sunyiming 1:6465a3f5c58a 728 dhcp.pcb = pcb;
sunyiming 1:6465a3f5c58a 729 dhcp.pcb->so_options |= SOF_BROADCAST;
sunyiming 1:6465a3f5c58a 730 udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
sunyiming 1:6465a3f5c58a 731 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
sunyiming 1:6465a3f5c58a 732 }
sunyiming 1:6465a3f5c58a 733 /* create and initialize the DHCP message header */
sunyiming 1:6465a3f5c58a 734 result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
sunyiming 1:6465a3f5c58a 735 if (result == ERR_OK) {
sunyiming 1:6465a3f5c58a 736 dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
sunyiming 1:6465a3f5c58a 737 dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
sunyiming 1:6465a3f5c58a 738
sunyiming 1:6465a3f5c58a 739 dhcp_option_trailer(&dhcp);
sunyiming 1:6465a3f5c58a 740
sunyiming 1:6465a3f5c58a 741 pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
sunyiming 1:6465a3f5c58a 742
sunyiming 1:6465a3f5c58a 743 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
sunyiming 1:6465a3f5c58a 744 udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
sunyiming 1:6465a3f5c58a 745 dhcp_delete_msg(&dhcp);
sunyiming 1:6465a3f5c58a 746 } else {
sunyiming 1:6465a3f5c58a 747 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
sunyiming 1:6465a3f5c58a 748 }
sunyiming 1:6465a3f5c58a 749
sunyiming 1:6465a3f5c58a 750 if (dhcp.pcb != NULL) {
sunyiming 1:6465a3f5c58a 751 /* otherwise, the existing pcb was used */
sunyiming 1:6465a3f5c58a 752 udp_remove(dhcp.pcb);
sunyiming 1:6465a3f5c58a 753 }
sunyiming 1:6465a3f5c58a 754 }
sunyiming 1:6465a3f5c58a 755
sunyiming 1:6465a3f5c58a 756 /** Handle a possible change in the network configuration.
sunyiming 1:6465a3f5c58a 757 *
sunyiming 1:6465a3f5c58a 758 * This enters the REBOOTING state to verify that the currently bound
sunyiming 1:6465a3f5c58a 759 * address is still valid.
sunyiming 1:6465a3f5c58a 760 */
sunyiming 1:6465a3f5c58a 761 void
sunyiming 1:6465a3f5c58a 762 dhcp_network_changed(struct netif *netif)
sunyiming 1:6465a3f5c58a 763 {
sunyiming 1:6465a3f5c58a 764 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 765 if (!dhcp)
sunyiming 1:6465a3f5c58a 766 return;
sunyiming 1:6465a3f5c58a 767 switch (dhcp->state) {
sunyiming 1:6465a3f5c58a 768 case DHCP_REBINDING:
sunyiming 1:6465a3f5c58a 769 case DHCP_RENEWING:
sunyiming 1:6465a3f5c58a 770 case DHCP_BOUND:
sunyiming 1:6465a3f5c58a 771 case DHCP_REBOOTING:
sunyiming 1:6465a3f5c58a 772 netif_set_down(netif);
sunyiming 1:6465a3f5c58a 773 dhcp->tries = 0;
sunyiming 1:6465a3f5c58a 774 dhcp_reboot(netif);
sunyiming 1:6465a3f5c58a 775 break;
sunyiming 1:6465a3f5c58a 776 case DHCP_OFF:
sunyiming 1:6465a3f5c58a 777 /* stay off */
sunyiming 1:6465a3f5c58a 778 break;
sunyiming 1:6465a3f5c58a 779 default:
sunyiming 1:6465a3f5c58a 780 dhcp->tries = 0;
sunyiming 1:6465a3f5c58a 781 #if LWIP_DHCP_AUTOIP_COOP
sunyiming 1:6465a3f5c58a 782 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
sunyiming 1:6465a3f5c58a 783 autoip_stop(netif);
sunyiming 1:6465a3f5c58a 784 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
sunyiming 1:6465a3f5c58a 785 }
sunyiming 1:6465a3f5c58a 786 #endif /* LWIP_DHCP_AUTOIP_COOP */
sunyiming 1:6465a3f5c58a 787 dhcp_discover(netif);
sunyiming 1:6465a3f5c58a 788 break;
sunyiming 1:6465a3f5c58a 789 }
sunyiming 1:6465a3f5c58a 790 }
sunyiming 1:6465a3f5c58a 791
sunyiming 1:6465a3f5c58a 792 #if DHCP_DOES_ARP_CHECK
sunyiming 1:6465a3f5c58a 793 /**
sunyiming 1:6465a3f5c58a 794 * Match an ARP reply with the offered IP address.
sunyiming 1:6465a3f5c58a 795 *
sunyiming 1:6465a3f5c58a 796 * @param netif the network interface on which the reply was received
sunyiming 1:6465a3f5c58a 797 * @param addr The IP address we received a reply from
sunyiming 1:6465a3f5c58a 798 */
sunyiming 1:6465a3f5c58a 799 void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
sunyiming 1:6465a3f5c58a 800 {
sunyiming 1:6465a3f5c58a 801 LWIP_ERROR("netif != NULL", (netif != NULL), return;);
sunyiming 1:6465a3f5c58a 802 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
sunyiming 1:6465a3f5c58a 803 /* is a DHCP client doing an ARP check? */
sunyiming 1:6465a3f5c58a 804 if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
sunyiming 1:6465a3f5c58a 805 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
sunyiming 1:6465a3f5c58a 806 ip4_addr_get_u32(addr)));
sunyiming 1:6465a3f5c58a 807 /* did a host respond with the address we
sunyiming 1:6465a3f5c58a 808 were offered by the DHCP server? */
sunyiming 1:6465a3f5c58a 809 if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
sunyiming 1:6465a3f5c58a 810 /* we will not accept the offered address */
sunyiming 1:6465a3f5c58a 811 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
sunyiming 1:6465a3f5c58a 812 ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
sunyiming 1:6465a3f5c58a 813 dhcp_decline(netif);
sunyiming 1:6465a3f5c58a 814 }
sunyiming 1:6465a3f5c58a 815 }
sunyiming 1:6465a3f5c58a 816 }
sunyiming 1:6465a3f5c58a 817
sunyiming 1:6465a3f5c58a 818 /**
sunyiming 1:6465a3f5c58a 819 * Decline an offered lease.
sunyiming 1:6465a3f5c58a 820 *
sunyiming 1:6465a3f5c58a 821 * Tell the DHCP server we do not accept the offered address.
sunyiming 1:6465a3f5c58a 822 * One reason to decline the lease is when we find out the address
sunyiming 1:6465a3f5c58a 823 * is already in use by another host (through ARP).
sunyiming 1:6465a3f5c58a 824 *
sunyiming 1:6465a3f5c58a 825 * @param netif the netif under DHCP control
sunyiming 1:6465a3f5c58a 826 */
sunyiming 1:6465a3f5c58a 827 static err_t
sunyiming 1:6465a3f5c58a 828 dhcp_decline(struct netif *netif)
sunyiming 1:6465a3f5c58a 829 {
sunyiming 1:6465a3f5c58a 830 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 831 err_t result = ERR_OK;
sunyiming 1:6465a3f5c58a 832 u16_t msecs;
sunyiming 1:6465a3f5c58a 833 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
sunyiming 1:6465a3f5c58a 834 dhcp_set_state(dhcp, DHCP_BACKING_OFF);
sunyiming 1:6465a3f5c58a 835 /* create and initialize the DHCP message header */
sunyiming 1:6465a3f5c58a 836 result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
sunyiming 1:6465a3f5c58a 837 if (result == ERR_OK) {
sunyiming 1:6465a3f5c58a 838 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
sunyiming 1:6465a3f5c58a 839 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
sunyiming 1:6465a3f5c58a 840
sunyiming 1:6465a3f5c58a 841 dhcp_option_trailer(dhcp);
sunyiming 1:6465a3f5c58a 842 /* resize pbuf to reflect true size of options */
sunyiming 1:6465a3f5c58a 843 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
sunyiming 1:6465a3f5c58a 844
sunyiming 1:6465a3f5c58a 845 /* per section 4.4.4, broadcast DECLINE messages */
sunyiming 1:6465a3f5c58a 846 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
sunyiming 1:6465a3f5c58a 847 dhcp_delete_msg(dhcp);
sunyiming 1:6465a3f5c58a 848 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
sunyiming 1:6465a3f5c58a 849 } else {
sunyiming 1:6465a3f5c58a 850 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
sunyiming 1:6465a3f5c58a 851 ("dhcp_decline: could not allocate DHCP request\n"));
sunyiming 1:6465a3f5c58a 852 }
sunyiming 1:6465a3f5c58a 853 dhcp->tries++;
sunyiming 1:6465a3f5c58a 854 msecs = 10*1000;
sunyiming 1:6465a3f5c58a 855 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
sunyiming 1:6465a3f5c58a 856 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
sunyiming 1:6465a3f5c58a 857 return result;
sunyiming 1:6465a3f5c58a 858 }
sunyiming 1:6465a3f5c58a 859 #endif /* DHCP_DOES_ARP_CHECK */
sunyiming 1:6465a3f5c58a 860
sunyiming 1:6465a3f5c58a 861
sunyiming 1:6465a3f5c58a 862 /**
sunyiming 1:6465a3f5c58a 863 * Start the DHCP process, discover a DHCP server.
sunyiming 1:6465a3f5c58a 864 *
sunyiming 1:6465a3f5c58a 865 * @param netif the netif under DHCP control
sunyiming 1:6465a3f5c58a 866 */
sunyiming 1:6465a3f5c58a 867 static err_t
sunyiming 1:6465a3f5c58a 868 dhcp_discover(struct netif *netif)
sunyiming 1:6465a3f5c58a 869 {
sunyiming 1:6465a3f5c58a 870 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 871 err_t result = ERR_OK;
sunyiming 1:6465a3f5c58a 872 u16_t msecs;
sunyiming 1:6465a3f5c58a 873 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
sunyiming 1:6465a3f5c58a 874 ip_addr_set_any(&dhcp->offered_ip_addr);
sunyiming 1:6465a3f5c58a 875 dhcp_set_state(dhcp, DHCP_SELECTING);
sunyiming 1:6465a3f5c58a 876 /* create and initialize the DHCP message header */
sunyiming 1:6465a3f5c58a 877 result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
sunyiming 1:6465a3f5c58a 878 if (result == ERR_OK) {
sunyiming 1:6465a3f5c58a 879 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
sunyiming 1:6465a3f5c58a 880
sunyiming 1:6465a3f5c58a 881 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
sunyiming 1:6465a3f5c58a 882 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
sunyiming 1:6465a3f5c58a 883
sunyiming 1:6465a3f5c58a 884 dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
sunyiming 1:6465a3f5c58a 885 dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
sunyiming 1:6465a3f5c58a 886 dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
sunyiming 1:6465a3f5c58a 887 dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
sunyiming 1:6465a3f5c58a 888 dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
sunyiming 1:6465a3f5c58a 889
sunyiming 1:6465a3f5c58a 890 dhcp_option_trailer(dhcp);
sunyiming 1:6465a3f5c58a 891
sunyiming 1:6465a3f5c58a 892 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
sunyiming 1:6465a3f5c58a 893 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
sunyiming 1:6465a3f5c58a 894
sunyiming 1:6465a3f5c58a 895 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
sunyiming 1:6465a3f5c58a 896 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
sunyiming 1:6465a3f5c58a 897 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
sunyiming 1:6465a3f5c58a 898 dhcp_delete_msg(dhcp);
sunyiming 1:6465a3f5c58a 899 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
sunyiming 1:6465a3f5c58a 900 } else {
sunyiming 1:6465a3f5c58a 901 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
sunyiming 1:6465a3f5c58a 902 }
sunyiming 1:6465a3f5c58a 903 dhcp->tries++;
sunyiming 1:6465a3f5c58a 904 #if LWIP_DHCP_AUTOIP_COOP
sunyiming 1:6465a3f5c58a 905 if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
sunyiming 1:6465a3f5c58a 906 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
sunyiming 1:6465a3f5c58a 907 autoip_start(netif);
sunyiming 1:6465a3f5c58a 908 }
sunyiming 1:6465a3f5c58a 909 #endif /* LWIP_DHCP_AUTOIP_COOP */
sunyiming 1:6465a3f5c58a 910 msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
sunyiming 1:6465a3f5c58a 911 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
sunyiming 1:6465a3f5c58a 912 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
sunyiming 1:6465a3f5c58a 913 return result;
sunyiming 1:6465a3f5c58a 914 }
sunyiming 1:6465a3f5c58a 915
sunyiming 1:6465a3f5c58a 916
sunyiming 1:6465a3f5c58a 917 /**
sunyiming 1:6465a3f5c58a 918 * Bind the interface to the offered IP address.
sunyiming 1:6465a3f5c58a 919 *
sunyiming 1:6465a3f5c58a 920 * @param netif network interface to bind to the offered address
sunyiming 1:6465a3f5c58a 921 */
sunyiming 1:6465a3f5c58a 922 static void
sunyiming 1:6465a3f5c58a 923 dhcp_bind(struct netif *netif)
sunyiming 1:6465a3f5c58a 924 {
sunyiming 1:6465a3f5c58a 925 u32_t timeout;
sunyiming 1:6465a3f5c58a 926 struct dhcp *dhcp;
sunyiming 1:6465a3f5c58a 927 ip_addr_t sn_mask, gw_addr;
sunyiming 1:6465a3f5c58a 928 LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
sunyiming 1:6465a3f5c58a 929 dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 930 LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
sunyiming 1:6465a3f5c58a 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));
sunyiming 1:6465a3f5c58a 932
sunyiming 1:6465a3f5c58a 933 /* temporary DHCP lease? */
sunyiming 1:6465a3f5c58a 934 if (dhcp->offered_t1_renew != 0xffffffffUL) {
sunyiming 1:6465a3f5c58a 935 /* set renewal period timer */
sunyiming 1:6465a3f5c58a 936 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
sunyiming 1:6465a3f5c58a 937 timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
sunyiming 1:6465a3f5c58a 938 if(timeout > 0xffff) {
sunyiming 1:6465a3f5c58a 939 timeout = 0xffff;
sunyiming 1:6465a3f5c58a 940 }
sunyiming 1:6465a3f5c58a 941 dhcp->t1_timeout = (u16_t)timeout;
sunyiming 1:6465a3f5c58a 942 if (dhcp->t1_timeout == 0) {
sunyiming 1:6465a3f5c58a 943 dhcp->t1_timeout = 1;
sunyiming 1:6465a3f5c58a 944 }
sunyiming 1:6465a3f5c58a 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));
sunyiming 1:6465a3f5c58a 946 }
sunyiming 1:6465a3f5c58a 947 /* set renewal period timer */
sunyiming 1:6465a3f5c58a 948 if (dhcp->offered_t2_rebind != 0xffffffffUL) {
sunyiming 1:6465a3f5c58a 949 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
sunyiming 1:6465a3f5c58a 950 timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
sunyiming 1:6465a3f5c58a 951 if(timeout > 0xffff) {
sunyiming 1:6465a3f5c58a 952 timeout = 0xffff;
sunyiming 1:6465a3f5c58a 953 }
sunyiming 1:6465a3f5c58a 954 dhcp->t2_timeout = (u16_t)timeout;
sunyiming 1:6465a3f5c58a 955 if (dhcp->t2_timeout == 0) {
sunyiming 1:6465a3f5c58a 956 dhcp->t2_timeout = 1;
sunyiming 1:6465a3f5c58a 957 }
sunyiming 1:6465a3f5c58a 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));
sunyiming 1:6465a3f5c58a 959 }
sunyiming 1:6465a3f5c58a 960
sunyiming 1:6465a3f5c58a 961 if (dhcp->subnet_mask_given) {
sunyiming 1:6465a3f5c58a 962 /* copy offered network mask */
sunyiming 1:6465a3f5c58a 963 ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
sunyiming 1:6465a3f5c58a 964 } else {
sunyiming 1:6465a3f5c58a 965 /* subnet mask not given, choose a safe subnet mask given the network class */
sunyiming 1:6465a3f5c58a 966 u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
sunyiming 1:6465a3f5c58a 967 if (first_octet <= 127) {
sunyiming 1:6465a3f5c58a 968 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000UL));
sunyiming 1:6465a3f5c58a 969 } else if (first_octet >= 192) {
sunyiming 1:6465a3f5c58a 970 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00UL));
sunyiming 1:6465a3f5c58a 971 } else {
sunyiming 1:6465a3f5c58a 972 ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000UL));
sunyiming 1:6465a3f5c58a 973 }
sunyiming 1:6465a3f5c58a 974 }
sunyiming 1:6465a3f5c58a 975
sunyiming 1:6465a3f5c58a 976 ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
sunyiming 1:6465a3f5c58a 977 /* gateway address not given? */
sunyiming 1:6465a3f5c58a 978 if (gw_addr.addr == IPADDR_ANY) {
sunyiming 1:6465a3f5c58a 979 /* copy network address */
sunyiming 1:6465a3f5c58a 980 ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
sunyiming 1:6465a3f5c58a 981 /* use first host address on network as gateway */
sunyiming 1:6465a3f5c58a 982 ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001UL));
sunyiming 1:6465a3f5c58a 983 }
sunyiming 1:6465a3f5c58a 984
sunyiming 1:6465a3f5c58a 985 #if LWIP_DHCP_AUTOIP_COOP
sunyiming 1:6465a3f5c58a 986 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
sunyiming 1:6465a3f5c58a 987 autoip_stop(netif);
sunyiming 1:6465a3f5c58a 988 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
sunyiming 1:6465a3f5c58a 989 }
sunyiming 1:6465a3f5c58a 990 #endif /* LWIP_DHCP_AUTOIP_COOP */
sunyiming 1:6465a3f5c58a 991
sunyiming 1:6465a3f5c58a 992 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
sunyiming 1:6465a3f5c58a 993 ip4_addr_get_u32(&dhcp->offered_ip_addr)));
sunyiming 1:6465a3f5c58a 994 netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
sunyiming 1:6465a3f5c58a 995 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
sunyiming 1:6465a3f5c58a 996 ip4_addr_get_u32(&sn_mask)));
sunyiming 1:6465a3f5c58a 997 netif_set_netmask(netif, &sn_mask);
sunyiming 1:6465a3f5c58a 998 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
sunyiming 1:6465a3f5c58a 999 ip4_addr_get_u32(&gw_addr)));
sunyiming 1:6465a3f5c58a 1000 netif_set_gw(netif, &gw_addr);
sunyiming 1:6465a3f5c58a 1001 /* bring the interface up */
sunyiming 1:6465a3f5c58a 1002 netif_set_up(netif);
sunyiming 1:6465a3f5c58a 1003 /* netif is now bound to DHCP leased address */
sunyiming 1:6465a3f5c58a 1004 dhcp_set_state(dhcp, DHCP_BOUND);
sunyiming 1:6465a3f5c58a 1005 }
sunyiming 1:6465a3f5c58a 1006
sunyiming 1:6465a3f5c58a 1007 /**
sunyiming 1:6465a3f5c58a 1008 * Renew an existing DHCP lease at the involved DHCP server.
sunyiming 1:6465a3f5c58a 1009 *
sunyiming 1:6465a3f5c58a 1010 * @param netif network interface which must renew its lease
sunyiming 1:6465a3f5c58a 1011 */
sunyiming 1:6465a3f5c58a 1012 err_t
sunyiming 1:6465a3f5c58a 1013 dhcp_renew(struct netif *netif)
sunyiming 1:6465a3f5c58a 1014 {
sunyiming 1:6465a3f5c58a 1015 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 1016 err_t result;
sunyiming 1:6465a3f5c58a 1017 u16_t msecs;
sunyiming 1:6465a3f5c58a 1018 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
sunyiming 1:6465a3f5c58a 1019 dhcp_set_state(dhcp, DHCP_RENEWING);
sunyiming 1:6465a3f5c58a 1020
sunyiming 1:6465a3f5c58a 1021 /* create and initialize the DHCP message header */
sunyiming 1:6465a3f5c58a 1022 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
sunyiming 1:6465a3f5c58a 1023 if (result == ERR_OK) {
sunyiming 1:6465a3f5c58a 1024 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
sunyiming 1:6465a3f5c58a 1025 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
sunyiming 1:6465a3f5c58a 1026
sunyiming 1:6465a3f5c58a 1027 #if LWIP_NETIF_HOSTNAME
sunyiming 1:6465a3f5c58a 1028 if (netif->hostname != NULL) {
sunyiming 1:6465a3f5c58a 1029 const char *p = (const char*)netif->hostname;
sunyiming 1:6465a3f5c58a 1030 u8_t namelen = (u8_t)strlen(p);
sunyiming 1:6465a3f5c58a 1031 if (namelen > 0) {
sunyiming 1:6465a3f5c58a 1032 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
sunyiming 1:6465a3f5c58a 1033 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
sunyiming 1:6465a3f5c58a 1034 while (*p) {
sunyiming 1:6465a3f5c58a 1035 dhcp_option_byte(dhcp, *p++);
sunyiming 1:6465a3f5c58a 1036 }
sunyiming 1:6465a3f5c58a 1037 }
sunyiming 1:6465a3f5c58a 1038 }
sunyiming 1:6465a3f5c58a 1039 #endif /* LWIP_NETIF_HOSTNAME */
sunyiming 1:6465a3f5c58a 1040
sunyiming 1:6465a3f5c58a 1041 #if 0
sunyiming 1:6465a3f5c58a 1042 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
sunyiming 1:6465a3f5c58a 1043 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
sunyiming 1:6465a3f5c58a 1044 #endif
sunyiming 1:6465a3f5c58a 1045
sunyiming 1:6465a3f5c58a 1046 #if 0
sunyiming 1:6465a3f5c58a 1047 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
sunyiming 1:6465a3f5c58a 1048 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
sunyiming 1:6465a3f5c58a 1049 #endif
sunyiming 1:6465a3f5c58a 1050 /* append DHCP message trailer */
sunyiming 1:6465a3f5c58a 1051 dhcp_option_trailer(dhcp);
sunyiming 1:6465a3f5c58a 1052
sunyiming 1:6465a3f5c58a 1053 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
sunyiming 1:6465a3f5c58a 1054
sunyiming 1:6465a3f5c58a 1055 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
sunyiming 1:6465a3f5c58a 1056 dhcp_delete_msg(dhcp);
sunyiming 1:6465a3f5c58a 1057
sunyiming 1:6465a3f5c58a 1058 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
sunyiming 1:6465a3f5c58a 1059 } else {
sunyiming 1:6465a3f5c58a 1060 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
sunyiming 1:6465a3f5c58a 1061 }
sunyiming 1:6465a3f5c58a 1062 dhcp->tries++;
sunyiming 1:6465a3f5c58a 1063 /* back-off on retries, but to a maximum of 20 seconds */
sunyiming 1:6465a3f5c58a 1064 msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
sunyiming 1:6465a3f5c58a 1065 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
sunyiming 1:6465a3f5c58a 1066 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
sunyiming 1:6465a3f5c58a 1067 return result;
sunyiming 1:6465a3f5c58a 1068 }
sunyiming 1:6465a3f5c58a 1069
sunyiming 1:6465a3f5c58a 1070 /**
sunyiming 1:6465a3f5c58a 1071 * Rebind with a DHCP server for an existing DHCP lease.
sunyiming 1:6465a3f5c58a 1072 *
sunyiming 1:6465a3f5c58a 1073 * @param netif network interface which must rebind with a DHCP server
sunyiming 1:6465a3f5c58a 1074 */
sunyiming 1:6465a3f5c58a 1075 static err_t
sunyiming 1:6465a3f5c58a 1076 dhcp_rebind(struct netif *netif)
sunyiming 1:6465a3f5c58a 1077 {
sunyiming 1:6465a3f5c58a 1078 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 1079 err_t result;
sunyiming 1:6465a3f5c58a 1080 u16_t msecs;
sunyiming 1:6465a3f5c58a 1081 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
sunyiming 1:6465a3f5c58a 1082 dhcp_set_state(dhcp, DHCP_REBINDING);
sunyiming 1:6465a3f5c58a 1083
sunyiming 1:6465a3f5c58a 1084 /* create and initialize the DHCP message header */
sunyiming 1:6465a3f5c58a 1085 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
sunyiming 1:6465a3f5c58a 1086 if (result == ERR_OK) {
sunyiming 1:6465a3f5c58a 1087 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
sunyiming 1:6465a3f5c58a 1088 dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
sunyiming 1:6465a3f5c58a 1089
sunyiming 1:6465a3f5c58a 1090 #if LWIP_NETIF_HOSTNAME
sunyiming 1:6465a3f5c58a 1091 if (netif->hostname != NULL) {
sunyiming 1:6465a3f5c58a 1092 const char *p = (const char*)netif->hostname;
sunyiming 1:6465a3f5c58a 1093 u8_t namelen = (u8_t)strlen(p);
sunyiming 1:6465a3f5c58a 1094 if (namelen > 0) {
sunyiming 1:6465a3f5c58a 1095 LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
sunyiming 1:6465a3f5c58a 1096 dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
sunyiming 1:6465a3f5c58a 1097 while (*p) {
sunyiming 1:6465a3f5c58a 1098 dhcp_option_byte(dhcp, *p++);
sunyiming 1:6465a3f5c58a 1099 }
sunyiming 1:6465a3f5c58a 1100 }
sunyiming 1:6465a3f5c58a 1101 }
sunyiming 1:6465a3f5c58a 1102 #endif /* LWIP_NETIF_HOSTNAME */
sunyiming 1:6465a3f5c58a 1103
sunyiming 1:6465a3f5c58a 1104 #if 0
sunyiming 1:6465a3f5c58a 1105 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
sunyiming 1:6465a3f5c58a 1106 dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
sunyiming 1:6465a3f5c58a 1107
sunyiming 1:6465a3f5c58a 1108 dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
sunyiming 1:6465a3f5c58a 1109 dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
sunyiming 1:6465a3f5c58a 1110 #endif
sunyiming 1:6465a3f5c58a 1111
sunyiming 1:6465a3f5c58a 1112 dhcp_option_trailer(dhcp);
sunyiming 1:6465a3f5c58a 1113
sunyiming 1:6465a3f5c58a 1114 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
sunyiming 1:6465a3f5c58a 1115
sunyiming 1:6465a3f5c58a 1116 /* broadcast to server */
sunyiming 1:6465a3f5c58a 1117 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
sunyiming 1:6465a3f5c58a 1118 dhcp_delete_msg(dhcp);
sunyiming 1:6465a3f5c58a 1119 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
sunyiming 1:6465a3f5c58a 1120 } else {
sunyiming 1:6465a3f5c58a 1121 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
sunyiming 1:6465a3f5c58a 1122 }
sunyiming 1:6465a3f5c58a 1123 dhcp->tries++;
sunyiming 1:6465a3f5c58a 1124 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
sunyiming 1:6465a3f5c58a 1125 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
sunyiming 1:6465a3f5c58a 1126 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
sunyiming 1:6465a3f5c58a 1127 return result;
sunyiming 1:6465a3f5c58a 1128 }
sunyiming 1:6465a3f5c58a 1129
sunyiming 1:6465a3f5c58a 1130 /**
sunyiming 1:6465a3f5c58a 1131 * Enter REBOOTING state to verify an existing lease
sunyiming 1:6465a3f5c58a 1132 *
sunyiming 1:6465a3f5c58a 1133 * @param netif network interface which must reboot
sunyiming 1:6465a3f5c58a 1134 */
sunyiming 1:6465a3f5c58a 1135 static err_t
sunyiming 1:6465a3f5c58a 1136 dhcp_reboot(struct netif *netif)
sunyiming 1:6465a3f5c58a 1137 {
sunyiming 1:6465a3f5c58a 1138 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 1139 err_t result;
sunyiming 1:6465a3f5c58a 1140 u16_t msecs;
sunyiming 1:6465a3f5c58a 1141 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
sunyiming 1:6465a3f5c58a 1142 dhcp_set_state(dhcp, DHCP_REBOOTING);
sunyiming 1:6465a3f5c58a 1143
sunyiming 1:6465a3f5c58a 1144 /* create and initialize the DHCP message header */
sunyiming 1:6465a3f5c58a 1145 result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
sunyiming 1:6465a3f5c58a 1146 if (result == ERR_OK) {
sunyiming 1:6465a3f5c58a 1147 dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
sunyiming 1:6465a3f5c58a 1148 dhcp_option_short(dhcp, 576);
sunyiming 1:6465a3f5c58a 1149
sunyiming 1:6465a3f5c58a 1150 dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
sunyiming 1:6465a3f5c58a 1151 dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
sunyiming 1:6465a3f5c58a 1152
sunyiming 1:6465a3f5c58a 1153 dhcp_option_trailer(dhcp);
sunyiming 1:6465a3f5c58a 1154
sunyiming 1:6465a3f5c58a 1155 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
sunyiming 1:6465a3f5c58a 1156
sunyiming 1:6465a3f5c58a 1157 /* broadcast to server */
sunyiming 1:6465a3f5c58a 1158 udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
sunyiming 1:6465a3f5c58a 1159 dhcp_delete_msg(dhcp);
sunyiming 1:6465a3f5c58a 1160 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
sunyiming 1:6465a3f5c58a 1161 } else {
sunyiming 1:6465a3f5c58a 1162 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
sunyiming 1:6465a3f5c58a 1163 }
sunyiming 1:6465a3f5c58a 1164 dhcp->tries++;
sunyiming 1:6465a3f5c58a 1165 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
sunyiming 1:6465a3f5c58a 1166 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
sunyiming 1:6465a3f5c58a 1167 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
sunyiming 1:6465a3f5c58a 1168 return result;
sunyiming 1:6465a3f5c58a 1169 }
sunyiming 1:6465a3f5c58a 1170
sunyiming 1:6465a3f5c58a 1171
sunyiming 1:6465a3f5c58a 1172 /**
sunyiming 1:6465a3f5c58a 1173 * Release a DHCP lease.
sunyiming 1:6465a3f5c58a 1174 *
sunyiming 1:6465a3f5c58a 1175 * @param netif network interface which must release its lease
sunyiming 1:6465a3f5c58a 1176 */
sunyiming 1:6465a3f5c58a 1177 err_t
sunyiming 1:6465a3f5c58a 1178 dhcp_release(struct netif *netif)
sunyiming 1:6465a3f5c58a 1179 {
sunyiming 1:6465a3f5c58a 1180 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 1181 err_t result;
sunyiming 1:6465a3f5c58a 1182 u16_t msecs;
sunyiming 1:6465a3f5c58a 1183 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
sunyiming 1:6465a3f5c58a 1184
sunyiming 1:6465a3f5c58a 1185 /* idle DHCP client */
sunyiming 1:6465a3f5c58a 1186 dhcp_set_state(dhcp, DHCP_OFF);
sunyiming 1:6465a3f5c58a 1187 /* clean old DHCP offer */
sunyiming 1:6465a3f5c58a 1188 ip_addr_set_zero(&dhcp->server_ip_addr);
sunyiming 1:6465a3f5c58a 1189 ip_addr_set_zero(&dhcp->offered_ip_addr);
sunyiming 1:6465a3f5c58a 1190 ip_addr_set_zero(&dhcp->offered_sn_mask);
sunyiming 1:6465a3f5c58a 1191 ip_addr_set_zero(&dhcp->offered_gw_addr);
sunyiming 1:6465a3f5c58a 1192 #if LWIP_DHCP_BOOTP_FILE
sunyiming 1:6465a3f5c58a 1193 ip_addr_set_zero(&dhcp->offered_si_addr);
sunyiming 1:6465a3f5c58a 1194 #endif /* LWIP_DHCP_BOOTP_FILE */
sunyiming 1:6465a3f5c58a 1195 dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
sunyiming 1:6465a3f5c58a 1196
sunyiming 1:6465a3f5c58a 1197 /* create and initialize the DHCP message header */
sunyiming 1:6465a3f5c58a 1198 result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
sunyiming 1:6465a3f5c58a 1199 if (result == ERR_OK) {
sunyiming 1:6465a3f5c58a 1200 dhcp_option_trailer(dhcp);
sunyiming 1:6465a3f5c58a 1201
sunyiming 1:6465a3f5c58a 1202 pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
sunyiming 1:6465a3f5c58a 1203
sunyiming 1:6465a3f5c58a 1204 udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
sunyiming 1:6465a3f5c58a 1205 dhcp_delete_msg(dhcp);
sunyiming 1:6465a3f5c58a 1206 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
sunyiming 1:6465a3f5c58a 1207 } else {
sunyiming 1:6465a3f5c58a 1208 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
sunyiming 1:6465a3f5c58a 1209 }
sunyiming 1:6465a3f5c58a 1210 dhcp->tries++;
sunyiming 1:6465a3f5c58a 1211 msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
sunyiming 1:6465a3f5c58a 1212 dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
sunyiming 1:6465a3f5c58a 1213 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
sunyiming 1:6465a3f5c58a 1214 /* bring the interface down */
sunyiming 1:6465a3f5c58a 1215 netif_set_down(netif);
sunyiming 1:6465a3f5c58a 1216 /* remove IP address from interface */
sunyiming 1:6465a3f5c58a 1217 netif_set_ipaddr(netif, IP_ADDR_ANY);
sunyiming 1:6465a3f5c58a 1218 netif_set_gw(netif, IP_ADDR_ANY);
sunyiming 1:6465a3f5c58a 1219 netif_set_netmask(netif, IP_ADDR_ANY);
sunyiming 1:6465a3f5c58a 1220
sunyiming 1:6465a3f5c58a 1221 return result;
sunyiming 1:6465a3f5c58a 1222 }
sunyiming 1:6465a3f5c58a 1223
sunyiming 1:6465a3f5c58a 1224 /**
sunyiming 1:6465a3f5c58a 1225 * Remove the DHCP client from the interface.
sunyiming 1:6465a3f5c58a 1226 *
sunyiming 1:6465a3f5c58a 1227 * @param netif The network interface to stop DHCP on
sunyiming 1:6465a3f5c58a 1228 */
sunyiming 1:6465a3f5c58a 1229 void
sunyiming 1:6465a3f5c58a 1230 dhcp_stop(struct netif *netif)
sunyiming 1:6465a3f5c58a 1231 {
sunyiming 1:6465a3f5c58a 1232 struct dhcp *dhcp;
sunyiming 1:6465a3f5c58a 1233 LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
sunyiming 1:6465a3f5c58a 1234 dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 1235 /* Remove the flag that says this netif is handled by DHCP. */
sunyiming 1:6465a3f5c58a 1236 netif->flags &= ~NETIF_FLAG_DHCP;
sunyiming 1:6465a3f5c58a 1237
sunyiming 1:6465a3f5c58a 1238 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
sunyiming 1:6465a3f5c58a 1239 /* netif is DHCP configured? */
sunyiming 1:6465a3f5c58a 1240 if (dhcp != NULL) {
sunyiming 1:6465a3f5c58a 1241 #if LWIP_DHCP_AUTOIP_COOP
sunyiming 1:6465a3f5c58a 1242 if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
sunyiming 1:6465a3f5c58a 1243 autoip_stop(netif);
sunyiming 1:6465a3f5c58a 1244 dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
sunyiming 1:6465a3f5c58a 1245 }
sunyiming 1:6465a3f5c58a 1246 #endif /* LWIP_DHCP_AUTOIP_COOP */
sunyiming 1:6465a3f5c58a 1247
sunyiming 1:6465a3f5c58a 1248 if (dhcp->pcb != NULL) {
sunyiming 1:6465a3f5c58a 1249 udp_remove(dhcp->pcb);
sunyiming 1:6465a3f5c58a 1250 dhcp->pcb = NULL;
sunyiming 1:6465a3f5c58a 1251 }
sunyiming 1:6465a3f5c58a 1252 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
sunyiming 1:6465a3f5c58a 1253 dhcp_set_state(dhcp, DHCP_OFF);
sunyiming 1:6465a3f5c58a 1254 }
sunyiming 1:6465a3f5c58a 1255 }
sunyiming 1:6465a3f5c58a 1256
sunyiming 1:6465a3f5c58a 1257 /*
sunyiming 1:6465a3f5c58a 1258 * Set the DHCP state of a DHCP client.
sunyiming 1:6465a3f5c58a 1259 *
sunyiming 1:6465a3f5c58a 1260 * If the state changed, reset the number of tries.
sunyiming 1:6465a3f5c58a 1261 */
sunyiming 1:6465a3f5c58a 1262 static void
sunyiming 1:6465a3f5c58a 1263 dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
sunyiming 1:6465a3f5c58a 1264 {
sunyiming 1:6465a3f5c58a 1265 if (new_state != dhcp->state) {
sunyiming 1:6465a3f5c58a 1266 dhcp->state = new_state;
sunyiming 1:6465a3f5c58a 1267 dhcp->tries = 0;
sunyiming 1:6465a3f5c58a 1268 dhcp->request_timeout = 0;
sunyiming 1:6465a3f5c58a 1269 }
sunyiming 1:6465a3f5c58a 1270 }
sunyiming 1:6465a3f5c58a 1271
sunyiming 1:6465a3f5c58a 1272 /*
sunyiming 1:6465a3f5c58a 1273 * Concatenate an option type and length field to the outgoing
sunyiming 1:6465a3f5c58a 1274 * DHCP message.
sunyiming 1:6465a3f5c58a 1275 *
sunyiming 1:6465a3f5c58a 1276 */
sunyiming 1:6465a3f5c58a 1277 static void
sunyiming 1:6465a3f5c58a 1278 dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
sunyiming 1:6465a3f5c58a 1279 {
sunyiming 1:6465a3f5c58a 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);
sunyiming 1:6465a3f5c58a 1281 dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
sunyiming 1:6465a3f5c58a 1282 dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
sunyiming 1:6465a3f5c58a 1283 }
sunyiming 1:6465a3f5c58a 1284 /*
sunyiming 1:6465a3f5c58a 1285 * Concatenate a single byte to the outgoing DHCP message.
sunyiming 1:6465a3f5c58a 1286 *
sunyiming 1:6465a3f5c58a 1287 */
sunyiming 1:6465a3f5c58a 1288 static void
sunyiming 1:6465a3f5c58a 1289 dhcp_option_byte(struct dhcp *dhcp, u8_t value)
sunyiming 1:6465a3f5c58a 1290 {
sunyiming 1:6465a3f5c58a 1291 LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
sunyiming 1:6465a3f5c58a 1292 dhcp->msg_out->options[dhcp->options_out_len++] = value;
sunyiming 1:6465a3f5c58a 1293 }
sunyiming 1:6465a3f5c58a 1294
sunyiming 1:6465a3f5c58a 1295 static void
sunyiming 1:6465a3f5c58a 1296 dhcp_option_short(struct dhcp *dhcp, u16_t value)
sunyiming 1:6465a3f5c58a 1297 {
sunyiming 1:6465a3f5c58a 1298 LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
sunyiming 1:6465a3f5c58a 1299 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
sunyiming 1:6465a3f5c58a 1300 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
sunyiming 1:6465a3f5c58a 1301 }
sunyiming 1:6465a3f5c58a 1302
sunyiming 1:6465a3f5c58a 1303 static void
sunyiming 1:6465a3f5c58a 1304 dhcp_option_long(struct dhcp *dhcp, u32_t value)
sunyiming 1:6465a3f5c58a 1305 {
sunyiming 1:6465a3f5c58a 1306 LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
sunyiming 1:6465a3f5c58a 1307 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
sunyiming 1:6465a3f5c58a 1308 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
sunyiming 1:6465a3f5c58a 1309 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
sunyiming 1:6465a3f5c58a 1310 dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
sunyiming 1:6465a3f5c58a 1311 }
sunyiming 1:6465a3f5c58a 1312
sunyiming 1:6465a3f5c58a 1313 /**
sunyiming 1:6465a3f5c58a 1314 * Extract the DHCP message and the DHCP options.
sunyiming 1:6465a3f5c58a 1315 *
sunyiming 1:6465a3f5c58a 1316 * Extract the DHCP message and the DHCP options, each into a contiguous
sunyiming 1:6465a3f5c58a 1317 * piece of memory. As a DHCP message is variable sized by its options,
sunyiming 1:6465a3f5c58a 1318 * and also allows overriding some fields for options, the easy approach
sunyiming 1:6465a3f5c58a 1319 * is to first unfold the options into a conitguous piece of memory, and
sunyiming 1:6465a3f5c58a 1320 * use that further on.
sunyiming 1:6465a3f5c58a 1321 *
sunyiming 1:6465a3f5c58a 1322 */
sunyiming 1:6465a3f5c58a 1323 static err_t
sunyiming 1:6465a3f5c58a 1324 dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
sunyiming 1:6465a3f5c58a 1325 {
sunyiming 1:6465a3f5c58a 1326 u8_t *options;
sunyiming 1:6465a3f5c58a 1327 u16_t offset;
sunyiming 1:6465a3f5c58a 1328 u16_t offset_max;
sunyiming 1:6465a3f5c58a 1329 u16_t options_idx;
sunyiming 1:6465a3f5c58a 1330 u16_t options_idx_max;
sunyiming 1:6465a3f5c58a 1331 struct pbuf *q;
sunyiming 1:6465a3f5c58a 1332 int parse_file_as_options = 0;
sunyiming 1:6465a3f5c58a 1333 int parse_sname_as_options = 0;
sunyiming 1:6465a3f5c58a 1334
sunyiming 1:6465a3f5c58a 1335 /* clear received options */
sunyiming 1:6465a3f5c58a 1336 dhcp_clear_all_options(dhcp);
sunyiming 1:6465a3f5c58a 1337 /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
sunyiming 1:6465a3f5c58a 1338 if (p->len < DHCP_SNAME_OFS) {
sunyiming 1:6465a3f5c58a 1339 return ERR_BUF;
sunyiming 1:6465a3f5c58a 1340 }
sunyiming 1:6465a3f5c58a 1341 dhcp->msg_in = (struct dhcp_msg *)p->payload;
sunyiming 1:6465a3f5c58a 1342 #if LWIP_DHCP_BOOTP_FILE
sunyiming 1:6465a3f5c58a 1343 /* clear boot file name */
sunyiming 1:6465a3f5c58a 1344 dhcp->boot_file_name[0] = 0;
sunyiming 1:6465a3f5c58a 1345 #endif /* LWIP_DHCP_BOOTP_FILE */
sunyiming 1:6465a3f5c58a 1346
sunyiming 1:6465a3f5c58a 1347 /* parse options */
sunyiming 1:6465a3f5c58a 1348
sunyiming 1:6465a3f5c58a 1349 /* start with options field */
sunyiming 1:6465a3f5c58a 1350 options_idx = DHCP_OPTIONS_OFS;
sunyiming 1:6465a3f5c58a 1351 /* parse options to the end of the received packet */
sunyiming 1:6465a3f5c58a 1352 options_idx_max = p->tot_len;
sunyiming 1:6465a3f5c58a 1353 again:
sunyiming 1:6465a3f5c58a 1354 q = p;
sunyiming 1:6465a3f5c58a 1355 while((q != NULL) && (options_idx >= q->len)) {
sunyiming 1:6465a3f5c58a 1356 options_idx -= q->len;
sunyiming 1:6465a3f5c58a 1357 options_idx_max -= q->len;
sunyiming 1:6465a3f5c58a 1358 q = q->next;
sunyiming 1:6465a3f5c58a 1359 }
sunyiming 1:6465a3f5c58a 1360 if (q == NULL) {
sunyiming 1:6465a3f5c58a 1361 return ERR_BUF;
sunyiming 1:6465a3f5c58a 1362 }
sunyiming 1:6465a3f5c58a 1363 offset = options_idx;
sunyiming 1:6465a3f5c58a 1364 offset_max = options_idx_max;
sunyiming 1:6465a3f5c58a 1365 options = (u8_t*)q->payload;
sunyiming 1:6465a3f5c58a 1366 /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
sunyiming 1:6465a3f5c58a 1367 while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
sunyiming 1:6465a3f5c58a 1368 u8_t op = options[offset];
sunyiming 1:6465a3f5c58a 1369 u8_t len;
sunyiming 1:6465a3f5c58a 1370 u8_t decode_len = 0;
sunyiming 1:6465a3f5c58a 1371 int decode_idx = -1;
sunyiming 1:6465a3f5c58a 1372 u16_t val_offset = offset + 2;
sunyiming 1:6465a3f5c58a 1373 /* len byte might be in the next pbuf */
sunyiming 1:6465a3f5c58a 1374 if (offset + 1 < q->len) {
sunyiming 1:6465a3f5c58a 1375 len = options[offset + 1];
sunyiming 1:6465a3f5c58a 1376 } else {
sunyiming 1:6465a3f5c58a 1377 len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
sunyiming 1:6465a3f5c58a 1378 }
sunyiming 1:6465a3f5c58a 1379 /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
sunyiming 1:6465a3f5c58a 1380 decode_len = len;
sunyiming 1:6465a3f5c58a 1381 switch(op) {
sunyiming 1:6465a3f5c58a 1382 /* case(DHCP_OPTION_END): handled above */
sunyiming 1:6465a3f5c58a 1383 case(DHCP_OPTION_PAD):
sunyiming 1:6465a3f5c58a 1384 /* special option: no len encoded */
sunyiming 1:6465a3f5c58a 1385 decode_len = len = 0;
sunyiming 1:6465a3f5c58a 1386 /* will be increased below */
sunyiming 1:6465a3f5c58a 1387 offset--;
sunyiming 1:6465a3f5c58a 1388 break;
sunyiming 1:6465a3f5c58a 1389 case(DHCP_OPTION_SUBNET_MASK):
sunyiming 1:6465a3f5c58a 1390 LWIP_ASSERT("len == 4", len == 4);
sunyiming 1:6465a3f5c58a 1391 decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
sunyiming 1:6465a3f5c58a 1392 break;
sunyiming 1:6465a3f5c58a 1393 case(DHCP_OPTION_ROUTER):
sunyiming 1:6465a3f5c58a 1394 decode_len = 4; /* only copy the first given router */
sunyiming 1:6465a3f5c58a 1395 LWIP_ASSERT("len >= decode_len", len >= decode_len);
sunyiming 1:6465a3f5c58a 1396 decode_idx = DHCP_OPTION_IDX_ROUTER;
sunyiming 1:6465a3f5c58a 1397 break;
sunyiming 1:6465a3f5c58a 1398 case(DHCP_OPTION_DNS_SERVER):
sunyiming 1:6465a3f5c58a 1399 /* special case: there might be more than one server */
sunyiming 1:6465a3f5c58a 1400 LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
sunyiming 1:6465a3f5c58a 1401 /* limit number of DNS servers */
sunyiming 1:6465a3f5c58a 1402 decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
sunyiming 1:6465a3f5c58a 1403 LWIP_ASSERT("len >= decode_len", len >= decode_len);
sunyiming 1:6465a3f5c58a 1404 decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
sunyiming 1:6465a3f5c58a 1405 break;
sunyiming 1:6465a3f5c58a 1406 case(DHCP_OPTION_LEASE_TIME):
sunyiming 1:6465a3f5c58a 1407 LWIP_ASSERT("len == 4", len == 4);
sunyiming 1:6465a3f5c58a 1408 decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
sunyiming 1:6465a3f5c58a 1409 break;
sunyiming 1:6465a3f5c58a 1410 case(DHCP_OPTION_OVERLOAD):
sunyiming 1:6465a3f5c58a 1411 LWIP_ASSERT("len == 1", len == 1);
sunyiming 1:6465a3f5c58a 1412 decode_idx = DHCP_OPTION_IDX_OVERLOAD;
sunyiming 1:6465a3f5c58a 1413 break;
sunyiming 1:6465a3f5c58a 1414 case(DHCP_OPTION_MESSAGE_TYPE):
sunyiming 1:6465a3f5c58a 1415 LWIP_ASSERT("len == 1", len == 1);
sunyiming 1:6465a3f5c58a 1416 decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
sunyiming 1:6465a3f5c58a 1417 break;
sunyiming 1:6465a3f5c58a 1418 case(DHCP_OPTION_SERVER_ID):
sunyiming 1:6465a3f5c58a 1419 LWIP_ASSERT("len == 4", len == 4);
sunyiming 1:6465a3f5c58a 1420 decode_idx = DHCP_OPTION_IDX_SERVER_ID;
sunyiming 1:6465a3f5c58a 1421 break;
sunyiming 1:6465a3f5c58a 1422 case(DHCP_OPTION_T1):
sunyiming 1:6465a3f5c58a 1423 LWIP_ASSERT("len == 4", len == 4);
sunyiming 1:6465a3f5c58a 1424 decode_idx = DHCP_OPTION_IDX_T1;
sunyiming 1:6465a3f5c58a 1425 break;
sunyiming 1:6465a3f5c58a 1426 case(DHCP_OPTION_T2):
sunyiming 1:6465a3f5c58a 1427 LWIP_ASSERT("len == 4", len == 4);
sunyiming 1:6465a3f5c58a 1428 decode_idx = DHCP_OPTION_IDX_T2;
sunyiming 1:6465a3f5c58a 1429 break;
sunyiming 1:6465a3f5c58a 1430 default:
sunyiming 1:6465a3f5c58a 1431 decode_len = 0;
sunyiming 1:6465a3f5c58a 1432 LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
sunyiming 1:6465a3f5c58a 1433 break;
sunyiming 1:6465a3f5c58a 1434 }
sunyiming 1:6465a3f5c58a 1435 offset += len + 2;
sunyiming 1:6465a3f5c58a 1436 if (decode_len > 0) {
sunyiming 1:6465a3f5c58a 1437 u32_t value = 0;
sunyiming 1:6465a3f5c58a 1438 u16_t copy_len;
sunyiming 1:6465a3f5c58a 1439 decode_next:
sunyiming 1:6465a3f5c58a 1440 LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
sunyiming 1:6465a3f5c58a 1441 LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
sunyiming 1:6465a3f5c58a 1442 copy_len = LWIP_MIN(decode_len, 4);
sunyiming 1:6465a3f5c58a 1443 pbuf_copy_partial(q, &value, copy_len, val_offset);
sunyiming 1:6465a3f5c58a 1444 if (decode_len > 4) {
sunyiming 1:6465a3f5c58a 1445 /* decode more than one u32_t */
sunyiming 1:6465a3f5c58a 1446 LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
sunyiming 1:6465a3f5c58a 1447 dhcp_got_option(dhcp, decode_idx);
sunyiming 1:6465a3f5c58a 1448 dhcp_set_option_value(dhcp, decode_idx, htonl(value));
sunyiming 1:6465a3f5c58a 1449 decode_len -= 4;
sunyiming 1:6465a3f5c58a 1450 val_offset += 4;
sunyiming 1:6465a3f5c58a 1451 decode_idx++;
sunyiming 1:6465a3f5c58a 1452 goto decode_next;
sunyiming 1:6465a3f5c58a 1453 } else if (decode_len == 4) {
sunyiming 1:6465a3f5c58a 1454 value = ntohl(value);
sunyiming 1:6465a3f5c58a 1455 } else {
sunyiming 1:6465a3f5c58a 1456 LWIP_ASSERT("invalid decode_len", decode_len == 1);
sunyiming 1:6465a3f5c58a 1457 value = ((u8_t*)&value)[0];
sunyiming 1:6465a3f5c58a 1458 }
sunyiming 1:6465a3f5c58a 1459 dhcp_got_option(dhcp, decode_idx);
sunyiming 1:6465a3f5c58a 1460 dhcp_set_option_value(dhcp, decode_idx, value);
sunyiming 1:6465a3f5c58a 1461 }
sunyiming 1:6465a3f5c58a 1462 if (offset >= q->len) {
sunyiming 1:6465a3f5c58a 1463 offset -= q->len;
sunyiming 1:6465a3f5c58a 1464 offset_max -= q->len;
sunyiming 1:6465a3f5c58a 1465 q = q->next;
sunyiming 1:6465a3f5c58a 1466 options = (u8_t*)q->payload;
sunyiming 1:6465a3f5c58a 1467 }
sunyiming 1:6465a3f5c58a 1468 }
sunyiming 1:6465a3f5c58a 1469 /* is this an overloaded message? */
sunyiming 1:6465a3f5c58a 1470 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
sunyiming 1:6465a3f5c58a 1471 u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
sunyiming 1:6465a3f5c58a 1472 dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
sunyiming 1:6465a3f5c58a 1473 if (overload == DHCP_OVERLOAD_FILE) {
sunyiming 1:6465a3f5c58a 1474 parse_file_as_options = 1;
sunyiming 1:6465a3f5c58a 1475 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
sunyiming 1:6465a3f5c58a 1476 } else if (overload == DHCP_OVERLOAD_SNAME) {
sunyiming 1:6465a3f5c58a 1477 parse_sname_as_options = 1;
sunyiming 1:6465a3f5c58a 1478 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
sunyiming 1:6465a3f5c58a 1479 } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
sunyiming 1:6465a3f5c58a 1480 parse_sname_as_options = 1;
sunyiming 1:6465a3f5c58a 1481 parse_file_as_options = 1;
sunyiming 1:6465a3f5c58a 1482 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
sunyiming 1:6465a3f5c58a 1483 } else {
sunyiming 1:6465a3f5c58a 1484 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
sunyiming 1:6465a3f5c58a 1485 }
sunyiming 1:6465a3f5c58a 1486 #if LWIP_DHCP_BOOTP_FILE
sunyiming 1:6465a3f5c58a 1487 if (!parse_file_as_options) {
sunyiming 1:6465a3f5c58a 1488 /* only do this for ACK messages */
sunyiming 1:6465a3f5c58a 1489 if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
sunyiming 1:6465a3f5c58a 1490 (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
sunyiming 1:6465a3f5c58a 1491 /* copy bootp file name, don't care for sname (server hostname) */
sunyiming 1:6465a3f5c58a 1492 pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
sunyiming 1:6465a3f5c58a 1493 /* make sure the string is really NULL-terminated */
sunyiming 1:6465a3f5c58a 1494 dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
sunyiming 1:6465a3f5c58a 1495 }
sunyiming 1:6465a3f5c58a 1496 #endif /* LWIP_DHCP_BOOTP_FILE */
sunyiming 1:6465a3f5c58a 1497 }
sunyiming 1:6465a3f5c58a 1498 if (parse_file_as_options) {
sunyiming 1:6465a3f5c58a 1499 /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
sunyiming 1:6465a3f5c58a 1500 parse_file_as_options = 0;
sunyiming 1:6465a3f5c58a 1501 options_idx = DHCP_FILE_OFS;
sunyiming 1:6465a3f5c58a 1502 options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
sunyiming 1:6465a3f5c58a 1503 goto again;
sunyiming 1:6465a3f5c58a 1504 } else if (parse_sname_as_options) {
sunyiming 1:6465a3f5c58a 1505 parse_sname_as_options = 0;
sunyiming 1:6465a3f5c58a 1506 options_idx = DHCP_SNAME_OFS;
sunyiming 1:6465a3f5c58a 1507 options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
sunyiming 1:6465a3f5c58a 1508 goto again;
sunyiming 1:6465a3f5c58a 1509 }
sunyiming 1:6465a3f5c58a 1510 return ERR_OK;
sunyiming 1:6465a3f5c58a 1511 }
sunyiming 1:6465a3f5c58a 1512
sunyiming 1:6465a3f5c58a 1513 /**
sunyiming 1:6465a3f5c58a 1514 * If an incoming DHCP message is in response to us, then trigger the state machine
sunyiming 1:6465a3f5c58a 1515 */
sunyiming 1:6465a3f5c58a 1516 static void
sunyiming 1:6465a3f5c58a 1517 dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
sunyiming 1:6465a3f5c58a 1518 {
sunyiming 1:6465a3f5c58a 1519 struct netif *netif = (struct netif *)arg;
sunyiming 1:6465a3f5c58a 1520 struct dhcp *dhcp = netif->dhcp;
sunyiming 1:6465a3f5c58a 1521 struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
sunyiming 1:6465a3f5c58a 1522 u8_t msg_type;
sunyiming 1:6465a3f5c58a 1523 u8_t i;
sunyiming 1:6465a3f5c58a 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,
sunyiming 1:6465a3f5c58a 1525 ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
sunyiming 1:6465a3f5c58a 1526 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
sunyiming 1:6465a3f5c58a 1527 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
sunyiming 1:6465a3f5c58a 1528 /* prevent warnings about unused arguments */
sunyiming 1:6465a3f5c58a 1529 LWIP_UNUSED_ARG(pcb);
sunyiming 1:6465a3f5c58a 1530 LWIP_UNUSED_ARG(addr);
sunyiming 1:6465a3f5c58a 1531 LWIP_UNUSED_ARG(port);
sunyiming 1:6465a3f5c58a 1532
sunyiming 1:6465a3f5c58a 1533 LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
sunyiming 1:6465a3f5c58a 1534
sunyiming 1:6465a3f5c58a 1535 if (p->len < DHCP_MIN_REPLY_LEN) {
sunyiming 1:6465a3f5c58a 1536 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
sunyiming 1:6465a3f5c58a 1537 goto free_pbuf_and_return;
sunyiming 1:6465a3f5c58a 1538 }
sunyiming 1:6465a3f5c58a 1539
sunyiming 1:6465a3f5c58a 1540 if (reply_msg->op != DHCP_BOOTREPLY) {
sunyiming 1:6465a3f5c58a 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));
sunyiming 1:6465a3f5c58a 1542 goto free_pbuf_and_return;
sunyiming 1:6465a3f5c58a 1543 }
sunyiming 1:6465a3f5c58a 1544 /* iterate through hardware address and match against DHCP message */
sunyiming 1:6465a3f5c58a 1545 for (i = 0; i < netif->hwaddr_len; i++) {
sunyiming 1:6465a3f5c58a 1546 if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
sunyiming 1:6465a3f5c58a 1547 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
sunyiming 1:6465a3f5c58a 1548 ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
sunyiming 1:6465a3f5c58a 1549 (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
sunyiming 1:6465a3f5c58a 1550 goto free_pbuf_and_return;
sunyiming 1:6465a3f5c58a 1551 }
sunyiming 1:6465a3f5c58a 1552 }
sunyiming 1:6465a3f5c58a 1553 /* match transaction ID against what we expected */
sunyiming 1:6465a3f5c58a 1554 if (ntohl(reply_msg->xid) != dhcp->xid) {
sunyiming 1:6465a3f5c58a 1555 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
sunyiming 1:6465a3f5c58a 1556 ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
sunyiming 1:6465a3f5c58a 1557 goto free_pbuf_and_return;
sunyiming 1:6465a3f5c58a 1558 }
sunyiming 1:6465a3f5c58a 1559 /* option fields could be unfold? */
sunyiming 1:6465a3f5c58a 1560 if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
sunyiming 1:6465a3f5c58a 1561 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
sunyiming 1:6465a3f5c58a 1562 ("problem unfolding DHCP message - too short on memory?\n"));
sunyiming 1:6465a3f5c58a 1563 goto free_pbuf_and_return;
sunyiming 1:6465a3f5c58a 1564 }
sunyiming 1:6465a3f5c58a 1565
sunyiming 1:6465a3f5c58a 1566 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
sunyiming 1:6465a3f5c58a 1567 /* obtain pointer to DHCP message type */
sunyiming 1:6465a3f5c58a 1568 if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
sunyiming 1:6465a3f5c58a 1569 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
sunyiming 1:6465a3f5c58a 1570 goto free_pbuf_and_return;
sunyiming 1:6465a3f5c58a 1571 }
sunyiming 1:6465a3f5c58a 1572
sunyiming 1:6465a3f5c58a 1573 /* read DHCP message type */
sunyiming 1:6465a3f5c58a 1574 msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
sunyiming 1:6465a3f5c58a 1575 /* message type is DHCP ACK? */
sunyiming 1:6465a3f5c58a 1576 if (msg_type == DHCP_ACK) {
sunyiming 1:6465a3f5c58a 1577 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
sunyiming 1:6465a3f5c58a 1578 /* in requesting state? */
sunyiming 1:6465a3f5c58a 1579 if (dhcp->state == DHCP_REQUESTING) {
sunyiming 1:6465a3f5c58a 1580 dhcp_handle_ack(netif);
sunyiming 1:6465a3f5c58a 1581 #if DHCP_DOES_ARP_CHECK
sunyiming 1:6465a3f5c58a 1582 /* check if the acknowledged lease address is already in use */
sunyiming 1:6465a3f5c58a 1583 dhcp_check(netif);
sunyiming 1:6465a3f5c58a 1584 #else
sunyiming 1:6465a3f5c58a 1585 /* bind interface to the acknowledged lease address */
sunyiming 1:6465a3f5c58a 1586 dhcp_bind(netif);
sunyiming 1:6465a3f5c58a 1587 #endif
sunyiming 1:6465a3f5c58a 1588 }
sunyiming 1:6465a3f5c58a 1589 /* already bound to the given lease address? */
sunyiming 1:6465a3f5c58a 1590 else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
sunyiming 1:6465a3f5c58a 1591 dhcp_bind(netif);
sunyiming 1:6465a3f5c58a 1592 }
sunyiming 1:6465a3f5c58a 1593 }
sunyiming 1:6465a3f5c58a 1594 /* received a DHCP_NAK in appropriate state? */
sunyiming 1:6465a3f5c58a 1595 else if ((msg_type == DHCP_NAK) &&
sunyiming 1:6465a3f5c58a 1596 ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
sunyiming 1:6465a3f5c58a 1597 (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
sunyiming 1:6465a3f5c58a 1598 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
sunyiming 1:6465a3f5c58a 1599 dhcp_handle_nak(netif);
sunyiming 1:6465a3f5c58a 1600 }
sunyiming 1:6465a3f5c58a 1601 /* received a DHCP_OFFER in DHCP_SELECTING state? */
sunyiming 1:6465a3f5c58a 1602 else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
sunyiming 1:6465a3f5c58a 1603 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
sunyiming 1:6465a3f5c58a 1604 dhcp->request_timeout = 0;
sunyiming 1:6465a3f5c58a 1605 /* remember offered lease */
sunyiming 1:6465a3f5c58a 1606 dhcp_handle_offer(netif);
sunyiming 1:6465a3f5c58a 1607 }
sunyiming 1:6465a3f5c58a 1608 free_pbuf_and_return:
sunyiming 1:6465a3f5c58a 1609 dhcp->msg_in = NULL;
sunyiming 1:6465a3f5c58a 1610 pbuf_free(p);
sunyiming 1:6465a3f5c58a 1611 }
sunyiming 1:6465a3f5c58a 1612
sunyiming 1:6465a3f5c58a 1613 /**
sunyiming 1:6465a3f5c58a 1614 * Create a DHCP request, fill in common headers
sunyiming 1:6465a3f5c58a 1615 *
sunyiming 1:6465a3f5c58a 1616 * @param netif the netif under DHCP control
sunyiming 1:6465a3f5c58a 1617 * @param dhcp dhcp control struct
sunyiming 1:6465a3f5c58a 1618 * @param message_type message type of the request
sunyiming 1:6465a3f5c58a 1619 */
sunyiming 1:6465a3f5c58a 1620 static err_t
sunyiming 1:6465a3f5c58a 1621 dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
sunyiming 1:6465a3f5c58a 1622 {
sunyiming 1:6465a3f5c58a 1623 u16_t i;
sunyiming 1:6465a3f5c58a 1624 #ifndef DHCP_GLOBAL_XID
sunyiming 1:6465a3f5c58a 1625 /** default global transaction identifier starting value (easy to match
sunyiming 1:6465a3f5c58a 1626 * with a packet analyser). We simply increment for each new request.
sunyiming 1:6465a3f5c58a 1627 * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
sunyiming 1:6465a3f5c58a 1628 * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
sunyiming 1:6465a3f5c58a 1629 static u32_t xid = 0xABCD0000;
sunyiming 1:6465a3f5c58a 1630 #else
sunyiming 1:6465a3f5c58a 1631 static u32_t xid;
sunyiming 1:6465a3f5c58a 1632 static u8_t xid_initialised = 0;
sunyiming 1:6465a3f5c58a 1633 if (!xid_initialised) {
sunyiming 1:6465a3f5c58a 1634 xid = DHCP_GLOBAL_XID;
sunyiming 1:6465a3f5c58a 1635 xid_initialised = !xid_initialised;
sunyiming 1:6465a3f5c58a 1636 }
sunyiming 1:6465a3f5c58a 1637 #endif
sunyiming 1:6465a3f5c58a 1638 LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
sunyiming 1:6465a3f5c58a 1639 LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
sunyiming 1:6465a3f5c58a 1640 LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
sunyiming 1:6465a3f5c58a 1641 LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
sunyiming 1:6465a3f5c58a 1642 dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
sunyiming 1:6465a3f5c58a 1643 if (dhcp->p_out == NULL) {
sunyiming 1:6465a3f5c58a 1644 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
sunyiming 1:6465a3f5c58a 1645 ("dhcp_create_msg(): could not allocate pbuf\n"));
sunyiming 1:6465a3f5c58a 1646 return ERR_MEM;
sunyiming 1:6465a3f5c58a 1647 }
sunyiming 1:6465a3f5c58a 1648 LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
sunyiming 1:6465a3f5c58a 1649 (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
sunyiming 1:6465a3f5c58a 1650
sunyiming 1:6465a3f5c58a 1651 /* reuse transaction identifier in retransmissions */
sunyiming 1:6465a3f5c58a 1652 if (dhcp->tries == 0) {
sunyiming 1:6465a3f5c58a 1653 xid++;
sunyiming 1:6465a3f5c58a 1654 }
sunyiming 1:6465a3f5c58a 1655 dhcp->xid = xid;
sunyiming 1:6465a3f5c58a 1656 LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
sunyiming 1:6465a3f5c58a 1657 ("transaction id xid(%"X32_F")\n", xid));
sunyiming 1:6465a3f5c58a 1658
sunyiming 1:6465a3f5c58a 1659 dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
sunyiming 1:6465a3f5c58a 1660
sunyiming 1:6465a3f5c58a 1661 dhcp->msg_out->op = DHCP_BOOTREQUEST;
sunyiming 1:6465a3f5c58a 1662 /* TODO: make link layer independent */
sunyiming 1:6465a3f5c58a 1663 dhcp->msg_out->htype = DHCP_HTYPE_ETH;
sunyiming 1:6465a3f5c58a 1664 dhcp->msg_out->hlen = netif->hwaddr_len;
sunyiming 1:6465a3f5c58a 1665 dhcp->msg_out->hops = 0;
sunyiming 1:6465a3f5c58a 1666 dhcp->msg_out->xid = htonl(dhcp->xid);
sunyiming 1:6465a3f5c58a 1667 dhcp->msg_out->secs = 0;
sunyiming 1:6465a3f5c58a 1668 /* we don't need the broadcast flag since we can receive unicast traffic
sunyiming 1:6465a3f5c58a 1669 before being fully configured! */
sunyiming 1:6465a3f5c58a 1670 dhcp->msg_out->flags = 0;
sunyiming 1:6465a3f5c58a 1671 ip_addr_set_zero(&dhcp->msg_out->ciaddr);
sunyiming 1:6465a3f5c58a 1672 /* set ciaddr to netif->ip_addr based on message_type and state */
sunyiming 1:6465a3f5c58a 1673 if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
sunyiming 1:6465a3f5c58a 1674 ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
sunyiming 1:6465a3f5c58a 1675 ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
sunyiming 1:6465a3f5c58a 1676 ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
sunyiming 1:6465a3f5c58a 1677 }
sunyiming 1:6465a3f5c58a 1678 ip_addr_set_zero(&dhcp->msg_out->yiaddr);
sunyiming 1:6465a3f5c58a 1679 ip_addr_set_zero(&dhcp->msg_out->siaddr);
sunyiming 1:6465a3f5c58a 1680 ip_addr_set_zero(&dhcp->msg_out->giaddr);
sunyiming 1:6465a3f5c58a 1681 for (i = 0; i < netif->hwaddr_len; i++) {
sunyiming 1:6465a3f5c58a 1682 /* copy netif hardware address */
sunyiming 1:6465a3f5c58a 1683 dhcp->msg_out->chaddr[i] = netif->hwaddr[i];
sunyiming 1:6465a3f5c58a 1684 }
sunyiming 1:6465a3f5c58a 1685 for ( ; i < DHCP_CHADDR_LEN; i++) {
sunyiming 1:6465a3f5c58a 1686 /* ... pad rest with zeroes */
sunyiming 1:6465a3f5c58a 1687 dhcp->msg_out->chaddr[i] = 0;
sunyiming 1:6465a3f5c58a 1688 }
sunyiming 1:6465a3f5c58a 1689 for (i = 0; i < DHCP_SNAME_LEN; i++) {
sunyiming 1:6465a3f5c58a 1690 dhcp->msg_out->sname[i] = 0;
sunyiming 1:6465a3f5c58a 1691 }
sunyiming 1:6465a3f5c58a 1692 for (i = 0; i < DHCP_FILE_LEN; i++) {
sunyiming 1:6465a3f5c58a 1693 dhcp->msg_out->file[i] = 0;
sunyiming 1:6465a3f5c58a 1694 }
sunyiming 1:6465a3f5c58a 1695 dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
sunyiming 1:6465a3f5c58a 1696 dhcp->options_out_len = 0;
sunyiming 1:6465a3f5c58a 1697 /* fill options field with an incrementing array (for debugging purposes) */
sunyiming 1:6465a3f5c58a 1698 for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
sunyiming 1:6465a3f5c58a 1699 dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
sunyiming 1:6465a3f5c58a 1700 }
sunyiming 1:6465a3f5c58a 1701 /* Add option MESSAGE_TYPE */
sunyiming 1:6465a3f5c58a 1702 dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
sunyiming 1:6465a3f5c58a 1703 dhcp_option_byte(dhcp, message_type);
sunyiming 1:6465a3f5c58a 1704 return ERR_OK;
sunyiming 1:6465a3f5c58a 1705 }
sunyiming 1:6465a3f5c58a 1706
sunyiming 1:6465a3f5c58a 1707 /**
sunyiming 1:6465a3f5c58a 1708 * Free previously allocated memory used to send a DHCP request.
sunyiming 1:6465a3f5c58a 1709 *
sunyiming 1:6465a3f5c58a 1710 * @param dhcp the dhcp struct to free the request from
sunyiming 1:6465a3f5c58a 1711 */
sunyiming 1:6465a3f5c58a 1712 static void
sunyiming 1:6465a3f5c58a 1713 dhcp_delete_msg(struct dhcp *dhcp)
sunyiming 1:6465a3f5c58a 1714 {
sunyiming 1:6465a3f5c58a 1715 LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
sunyiming 1:6465a3f5c58a 1716 LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
sunyiming 1:6465a3f5c58a 1717 LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
sunyiming 1:6465a3f5c58a 1718 if (dhcp->p_out != NULL) {
sunyiming 1:6465a3f5c58a 1719 pbuf_free(dhcp->p_out);
sunyiming 1:6465a3f5c58a 1720 }
sunyiming 1:6465a3f5c58a 1721 dhcp->p_out = NULL;
sunyiming 1:6465a3f5c58a 1722 dhcp->msg_out = NULL;
sunyiming 1:6465a3f5c58a 1723 }
sunyiming 1:6465a3f5c58a 1724
sunyiming 1:6465a3f5c58a 1725 /**
sunyiming 1:6465a3f5c58a 1726 * Add a DHCP message trailer
sunyiming 1:6465a3f5c58a 1727 *
sunyiming 1:6465a3f5c58a 1728 * Adds the END option to the DHCP message, and if
sunyiming 1:6465a3f5c58a 1729 * necessary, up to three padding bytes.
sunyiming 1:6465a3f5c58a 1730 *
sunyiming 1:6465a3f5c58a 1731 * @param dhcp DHCP state structure
sunyiming 1:6465a3f5c58a 1732 */
sunyiming 1:6465a3f5c58a 1733 static void
sunyiming 1:6465a3f5c58a 1734 dhcp_option_trailer(struct dhcp *dhcp)
sunyiming 1:6465a3f5c58a 1735 {
sunyiming 1:6465a3f5c58a 1736 LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
sunyiming 1:6465a3f5c58a 1737 LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
sunyiming 1:6465a3f5c58a 1738 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
sunyiming 1:6465a3f5c58a 1739 dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
sunyiming 1:6465a3f5c58a 1740 /* packet is too small, or not 4 byte aligned? */
sunyiming 1:6465a3f5c58a 1741 while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
sunyiming 1:6465a3f5c58a 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)); */
sunyiming 1:6465a3f5c58a 1743 LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
sunyiming 1:6465a3f5c58a 1744 /* add a fill/padding byte */
sunyiming 1:6465a3f5c58a 1745 dhcp->msg_out->options[dhcp->options_out_len++] = 0;
sunyiming 1:6465a3f5c58a 1746 }
sunyiming 1:6465a3f5c58a 1747 }
sunyiming 1:6465a3f5c58a 1748
sunyiming 1:6465a3f5c58a 1749 #endif /* LWIP_DHCP */