ban4jp - / Mbed 2 deprecated uIP-1-0_webserver

uIP 1.0 based webserver for LPC1114 + ENC28J60

Dependencies:   mbed TMP102

uip/uip-fw.c@0:685224d2f66d, 2014-06-14 (annotated)

Committer:
ban4jp
Date:
Sat Jun 14 16:02:21 2014 +0000
Revision:
0:685224d2f66d
Child:
3:a2715e9c7737
initial commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ban4jp 0:685224d2f66d 1 /*
ban4jp 0:685224d2f66d 2 * Copyright (c) 2004, Swedish Institute of Computer Science.
ban4jp 0:685224d2f66d 3 * All rights reserved.
ban4jp 0:685224d2f66d 4 *
ban4jp 0:685224d2f66d 5 * Redistribution and use in source and binary forms, with or without
ban4jp 0:685224d2f66d 6 * modification, are permitted provided that the following conditions
ban4jp 0:685224d2f66d 7 * are met:
ban4jp 0:685224d2f66d 8 * 1. Redistributions of source code must retain the above copyright
ban4jp 0:685224d2f66d 9 * notice, this list of conditions and the following disclaimer.
ban4jp 0:685224d2f66d 10 * 2. Redistributions in binary form must reproduce the above copyright
ban4jp 0:685224d2f66d 11 * notice, this list of conditions and the following disclaimer in the
ban4jp 0:685224d2f66d 12 * documentation and/or other materials provided with the distribution.
ban4jp 0:685224d2f66d 13 * 3. Neither the name of the Institute nor the names of its contributors
ban4jp 0:685224d2f66d 14 * may be used to endorse or promote products derived from this software
ban4jp 0:685224d2f66d 15 * without specific prior written permission.
ban4jp 0:685224d2f66d 16 *
ban4jp 0:685224d2f66d 17 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
ban4jp 0:685224d2f66d 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ban4jp 0:685224d2f66d 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ban4jp 0:685224d2f66d 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
ban4jp 0:685224d2f66d 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ban4jp 0:685224d2f66d 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
ban4jp 0:685224d2f66d 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ban4jp 0:685224d2f66d 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
ban4jp 0:685224d2f66d 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
ban4jp 0:685224d2f66d 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
ban4jp 0:685224d2f66d 27 * SUCH DAMAGE.
ban4jp 0:685224d2f66d 28 *
ban4jp 0:685224d2f66d 29 * This file is part of the uIP TCP/IP stack
ban4jp 0:685224d2f66d 30 *
ban4jp 0:685224d2f66d 31 * Author: Adam Dunkels <adam@sics.se>
ban4jp 0:685224d2f66d 32 *
ban4jp 0:685224d2f66d 33 * $Id: uip-fw.c,v 1.2 2006/06/12 08:00:30 adam Exp $
ban4jp 0:685224d2f66d 34 */
ban4jp 0:685224d2f66d 35 /**
ban4jp 0:685224d2f66d 36 * \addtogroup uip
ban4jp 0:685224d2f66d 37 * @{
ban4jp 0:685224d2f66d 38 */
ban4jp 0:685224d2f66d 39
ban4jp 0:685224d2f66d 40 /**
ban4jp 0:685224d2f66d 41 * \defgroup uipfw uIP packet forwarding
ban4jp 0:685224d2f66d 42 * @{
ban4jp 0:685224d2f66d 43 *
ban4jp 0:685224d2f66d 44 */
ban4jp 0:685224d2f66d 45
ban4jp 0:685224d2f66d 46 /**
ban4jp 0:685224d2f66d 47 * \file
ban4jp 0:685224d2f66d 48 * uIP packet forwarding.
ban4jp 0:685224d2f66d 49 * \author Adam Dunkels <adam@sics.se>
ban4jp 0:685224d2f66d 50 *
ban4jp 0:685224d2f66d 51 * This file implements a number of simple functions which do packet
ban4jp 0:685224d2f66d 52 * forwarding over multiple network interfaces with uIP.
ban4jp 0:685224d2f66d 53 *
ban4jp 0:685224d2f66d 54 */
ban4jp 0:685224d2f66d 55
ban4jp 0:685224d2f66d 56 #include "uip.h"
ban4jp 0:685224d2f66d 57 #include "uip_arch.h"
ban4jp 0:685224d2f66d 58 #include "uip-fw.h"
ban4jp 0:685224d2f66d 59
ban4jp 0:685224d2f66d 60 #include <string.h> /* for memcpy() */
ban4jp 0:685224d2f66d 61
ban4jp 0:685224d2f66d 62 /*
ban4jp 0:685224d2f66d 63 * The list of registered network interfaces.
ban4jp 0:685224d2f66d 64 */
ban4jp 0:685224d2f66d 65 static struct uip_fw_netif *netifs = NULL;
ban4jp 0:685224d2f66d 66
ban4jp 0:685224d2f66d 67 /*
ban4jp 0:685224d2f66d 68 * A pointer to the default network interface.
ban4jp 0:685224d2f66d 69 */
ban4jp 0:685224d2f66d 70 static struct uip_fw_netif *defaultnetif = NULL;
ban4jp 0:685224d2f66d 71
ban4jp 0:685224d2f66d 72 struct tcpip_hdr {
ban4jp 0:685224d2f66d 73 /* IP header. */
ban4jp 0:685224d2f66d 74 u8_t vhl,
ban4jp 0:685224d2f66d 75 tos;
ban4jp 0:685224d2f66d 76 u16_t len,
ban4jp 0:685224d2f66d 77 ipid,
ban4jp 0:685224d2f66d 78 ipoffset;
ban4jp 0:685224d2f66d 79 u8_t ttl,
ban4jp 0:685224d2f66d 80 proto;
ban4jp 0:685224d2f66d 81 u16_t ipchksum;
ban4jp 0:685224d2f66d 82 u16_t srcipaddr[2],
ban4jp 0:685224d2f66d 83 destipaddr[2];
ban4jp 0:685224d2f66d 84
ban4jp 0:685224d2f66d 85 /* TCP header. */
ban4jp 0:685224d2f66d 86 u16_t srcport,
ban4jp 0:685224d2f66d 87 destport;
ban4jp 0:685224d2f66d 88 u8_t seqno[4],
ban4jp 0:685224d2f66d 89 ackno[4],
ban4jp 0:685224d2f66d 90 tcpoffset,
ban4jp 0:685224d2f66d 91 flags,
ban4jp 0:685224d2f66d 92 wnd[2];
ban4jp 0:685224d2f66d 93 u16_t tcpchksum;
ban4jp 0:685224d2f66d 94 u8_t urgp[2];
ban4jp 0:685224d2f66d 95 u8_t optdata[4];
ban4jp 0:685224d2f66d 96 };
ban4jp 0:685224d2f66d 97
ban4jp 0:685224d2f66d 98 struct icmpip_hdr {
ban4jp 0:685224d2f66d 99 /* IP header. */
ban4jp 0:685224d2f66d 100 u8_t vhl,
ban4jp 0:685224d2f66d 101 tos,
ban4jp 0:685224d2f66d 102 len[2],
ban4jp 0:685224d2f66d 103 ipid[2],
ban4jp 0:685224d2f66d 104 ipoffset[2],
ban4jp 0:685224d2f66d 105 ttl,
ban4jp 0:685224d2f66d 106 proto;
ban4jp 0:685224d2f66d 107 u16_t ipchksum;
ban4jp 0:685224d2f66d 108 u16_t srcipaddr[2],
ban4jp 0:685224d2f66d 109 destipaddr[2];
ban4jp 0:685224d2f66d 110 /* ICMP (echo) header. */
ban4jp 0:685224d2f66d 111 u8_t type, icode;
ban4jp 0:685224d2f66d 112 u16_t icmpchksum;
ban4jp 0:685224d2f66d 113 u16_t id, seqno;
ban4jp 0:685224d2f66d 114 u8_t payload[1];
ban4jp 0:685224d2f66d 115 };
ban4jp 0:685224d2f66d 116
ban4jp 0:685224d2f66d 117 /* ICMP ECHO. */
ban4jp 0:685224d2f66d 118 #define ICMP_ECHO 8
ban4jp 0:685224d2f66d 119
ban4jp 0:685224d2f66d 120 /* ICMP TIME-EXCEEDED. */
ban4jp 0:685224d2f66d 121 #define ICMP_TE 11
ban4jp 0:685224d2f66d 122
ban4jp 0:685224d2f66d 123 /*
ban4jp 0:685224d2f66d 124 * Pointer to the TCP/IP headers of the packet in the uip_buf buffer.
ban4jp 0:685224d2f66d 125 */
ban4jp 0:685224d2f66d 126 #define BUF ((struct tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
ban4jp 0:685224d2f66d 127
ban4jp 0:685224d2f66d 128 /*
ban4jp 0:685224d2f66d 129 * Pointer to the ICMP/IP headers of the packet in the uip_buf buffer.
ban4jp 0:685224d2f66d 130 */
ban4jp 0:685224d2f66d 131 #define ICMPBUF ((struct icmpip_hdr *)&uip_buf[UIP_LLH_LEN])
ban4jp 0:685224d2f66d 132
ban4jp 0:685224d2f66d 133 /*
ban4jp 0:685224d2f66d 134 * Certain fields of an IP packet that are used for identifying
ban4jp 0:685224d2f66d 135 * duplicate packets.
ban4jp 0:685224d2f66d 136 */
ban4jp 0:685224d2f66d 137 struct fwcache_entry {
ban4jp 0:685224d2f66d 138 u16_t timer;
ban4jp 0:685224d2f66d 139
ban4jp 0:685224d2f66d 140 u16_t srcipaddr[2];
ban4jp 0:685224d2f66d 141 u16_t destipaddr[2];
ban4jp 0:685224d2f66d 142 u16_t ipid;
ban4jp 0:685224d2f66d 143 u8_t proto;
ban4jp 0:685224d2f66d 144 u8_t unused;
ban4jp 0:685224d2f66d 145
ban4jp 0:685224d2f66d 146 #if notdef
ban4jp 0:685224d2f66d 147 u16_t payload[2];
ban4jp 0:685224d2f66d 148 #endif
ban4jp 0:685224d2f66d 149
ban4jp 0:685224d2f66d 150 #if UIP_REASSEMBLY > 0
ban4jp 0:685224d2f66d 151 u16_t len, offset;
ban4jp 0:685224d2f66d 152 #endif
ban4jp 0:685224d2f66d 153 };
ban4jp 0:685224d2f66d 154
ban4jp 0:685224d2f66d 155 /*
ban4jp 0:685224d2f66d 156 * The number of packets to remember when looking for duplicates.
ban4jp 0:685224d2f66d 157 */
ban4jp 0:685224d2f66d 158 #ifdef UIP_CONF_FWCACHE_SIZE
ban4jp 0:685224d2f66d 159 #define FWCACHE_SIZE UIP_CONF_FWCACHE_SIZE
ban4jp 0:685224d2f66d 160 #else
ban4jp 0:685224d2f66d 161 #define FWCACHE_SIZE 2
ban4jp 0:685224d2f66d 162 #endif
ban4jp 0:685224d2f66d 163
ban4jp 0:685224d2f66d 164
ban4jp 0:685224d2f66d 165 /*
ban4jp 0:685224d2f66d 166 * A cache of packet header fields which are used for
ban4jp 0:685224d2f66d 167 * identifying duplicate packets.
ban4jp 0:685224d2f66d 168 */
ban4jp 0:685224d2f66d 169 static struct fwcache_entry fwcache[FWCACHE_SIZE];
ban4jp 0:685224d2f66d 170
ban4jp 0:685224d2f66d 171 /**
ban4jp 0:685224d2f66d 172 * \internal
ban4jp 0:685224d2f66d 173 * The time that a packet cache is active.
ban4jp 0:685224d2f66d 174 */
ban4jp 0:685224d2f66d 175 #define FW_TIME 20
ban4jp 0:685224d2f66d 176
ban4jp 0:685224d2f66d 177 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 178 /**
ban4jp 0:685224d2f66d 179 * Initialize the uIP packet forwarding module.
ban4jp 0:685224d2f66d 180 */
ban4jp 0:685224d2f66d 181 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 182 void
ban4jp 0:685224d2f66d 183 uip_fw_init(void)
ban4jp 0:685224d2f66d 184 {
ban4jp 0:685224d2f66d 185 struct uip_fw_netif *t;
ban4jp 0:685224d2f66d 186 defaultnetif = NULL;
ban4jp 0:685224d2f66d 187 while(netifs != NULL) {
ban4jp 0:685224d2f66d 188 t = netifs;
ban4jp 0:685224d2f66d 189 netifs = netifs->next;
ban4jp 0:685224d2f66d 190 t->next = NULL;
ban4jp 0:685224d2f66d 191 }
ban4jp 0:685224d2f66d 192 }
ban4jp 0:685224d2f66d 193 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 194 /**
ban4jp 0:685224d2f66d 195 * \internal
ban4jp 0:685224d2f66d 196 * Check if an IP address is within the network defined by an IP
ban4jp 0:685224d2f66d 197 * address and a netmask.
ban4jp 0:685224d2f66d 198 *
ban4jp 0:685224d2f66d 199 * \param ipaddr The IP address to be checked.
ban4jp 0:685224d2f66d 200 * \param netipaddr The IP address of the network.
ban4jp 0:685224d2f66d 201 * \param netmask The netmask of the network.
ban4jp 0:685224d2f66d 202 *
ban4jp 0:685224d2f66d 203 * \return Non-zero if IP address is in network, zero otherwise.
ban4jp 0:685224d2f66d 204 */
ban4jp 0:685224d2f66d 205 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 206 static unsigned char
ban4jp 0:685224d2f66d 207 ipaddr_maskcmp(u16_t *ipaddr, u16_t *netipaddr, u16_t *netmask)
ban4jp 0:685224d2f66d 208 {
ban4jp 0:685224d2f66d 209 return (ipaddr[0] & netmask [0]) == (netipaddr[0] & netmask[0]) &&
ban4jp 0:685224d2f66d 210 (ipaddr[1] & netmask[1]) == (netipaddr[1] & netmask[1]);
ban4jp 0:685224d2f66d 211 }
ban4jp 0:685224d2f66d 212 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 213 /**
ban4jp 0:685224d2f66d 214 * \internal
ban4jp 0:685224d2f66d 215 * Send out an ICMP TIME-EXCEEDED message.
ban4jp 0:685224d2f66d 216 *
ban4jp 0:685224d2f66d 217 * This function replaces the packet in the uip_buf buffer with the
ban4jp 0:685224d2f66d 218 * ICMP packet.
ban4jp 0:685224d2f66d 219 */
ban4jp 0:685224d2f66d 220 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 221 static void
ban4jp 0:685224d2f66d 222 time_exceeded(void)
ban4jp 0:685224d2f66d 223 {
ban4jp 0:685224d2f66d 224 u16_t tmp16;
ban4jp 0:685224d2f66d 225
ban4jp 0:685224d2f66d 226 /* We don't send out ICMP errors for ICMP messages. */
ban4jp 0:685224d2f66d 227 if(ICMPBUF->proto == UIP_PROTO_ICMP) {
ban4jp 0:685224d2f66d 228 uip_len = 0;
ban4jp 0:685224d2f66d 229 return;
ban4jp 0:685224d2f66d 230 }
ban4jp 0:685224d2f66d 231 /* Copy fields from packet header into payload of this ICMP packet. */
ban4jp 0:685224d2f66d 232 memcpy(&(ICMPBUF->payload[0]), ICMPBUF, 28);
ban4jp 0:685224d2f66d 233
ban4jp 0:685224d2f66d 234 /* Set the ICMP type and code. */
ban4jp 0:685224d2f66d 235 ICMPBUF->type = ICMP_TE;
ban4jp 0:685224d2f66d 236 ICMPBUF->icode = 0;
ban4jp 0:685224d2f66d 237
ban4jp 0:685224d2f66d 238 /* Calculate the ICMP checksum. */
ban4jp 0:685224d2f66d 239 ICMPBUF->icmpchksum = 0;
ban4jp 0:685224d2f66d 240 ICMPBUF->icmpchksum = ~uip_chksum((u16_t *)&(ICMPBUF->type), 36);
ban4jp 0:685224d2f66d 241
ban4jp 0:685224d2f66d 242 /* Set the IP destination address to be the source address of the
ban4jp 0:685224d2f66d 243 original packet. */
ban4jp 0:685224d2f66d 244 tmp16= BUF->destipaddr[0];
ban4jp 0:685224d2f66d 245 BUF->destipaddr[0] = BUF->srcipaddr[0];
ban4jp 0:685224d2f66d 246 BUF->srcipaddr[0] = tmp16;
ban4jp 0:685224d2f66d 247 tmp16 = BUF->destipaddr[1];
ban4jp 0:685224d2f66d 248 BUF->destipaddr[1] = BUF->srcipaddr[1];
ban4jp 0:685224d2f66d 249 BUF->srcipaddr[1] = tmp16;
ban4jp 0:685224d2f66d 250
ban4jp 0:685224d2f66d 251 /* Set our IP address as the source address. */
ban4jp 0:685224d2f66d 252 BUF->srcipaddr[0] = uip_hostaddr[0];
ban4jp 0:685224d2f66d 253 BUF->srcipaddr[1] = uip_hostaddr[1];
ban4jp 0:685224d2f66d 254
ban4jp 0:685224d2f66d 255 /* The size of the ICMP time exceeded packet is 36 + the size of the
ban4jp 0:685224d2f66d 256 IP header (20) = 56. */
ban4jp 0:685224d2f66d 257 uip_len = 56;
ban4jp 0:685224d2f66d 258 ICMPBUF->len[0] = 0;
ban4jp 0:685224d2f66d 259 ICMPBUF->len[1] = uip_len;
ban4jp 0:685224d2f66d 260
ban4jp 0:685224d2f66d 261 /* Fill in the other fields in the IP header. */
ban4jp 0:685224d2f66d 262 ICMPBUF->vhl = 0x45;
ban4jp 0:685224d2f66d 263 ICMPBUF->tos = 0;
ban4jp 0:685224d2f66d 264 ICMPBUF->ipoffset[0] = ICMPBUF->ipoffset[1] = 0;
ban4jp 0:685224d2f66d 265 ICMPBUF->ttl = UIP_TTL;
ban4jp 0:685224d2f66d 266 ICMPBUF->proto = UIP_PROTO_ICMP;
ban4jp 0:685224d2f66d 267
ban4jp 0:685224d2f66d 268 /* Calculate IP checksum. */
ban4jp 0:685224d2f66d 269 ICMPBUF->ipchksum = 0;
ban4jp 0:685224d2f66d 270 ICMPBUF->ipchksum = ~(uip_ipchksum());
ban4jp 0:685224d2f66d 271
ban4jp 0:685224d2f66d 272
ban4jp 0:685224d2f66d 273 }
ban4jp 0:685224d2f66d 274 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 275 /**
ban4jp 0:685224d2f66d 276 * \internal
ban4jp 0:685224d2f66d 277 * Register a packet in the forwarding cache so that it won't be
ban4jp 0:685224d2f66d 278 * forwarded again.
ban4jp 0:685224d2f66d 279 */
ban4jp 0:685224d2f66d 280 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 281 static void
ban4jp 0:685224d2f66d 282 fwcache_register(void)
ban4jp 0:685224d2f66d 283 {
ban4jp 0:685224d2f66d 284 struct fwcache_entry *fw;
ban4jp 0:685224d2f66d 285 int i, oldest;
ban4jp 0:685224d2f66d 286
ban4jp 0:685224d2f66d 287 oldest = FW_TIME;
ban4jp 0:685224d2f66d 288 fw = NULL;
ban4jp 0:685224d2f66d 289
ban4jp 0:685224d2f66d 290 /* Find the oldest entry in the cache. */
ban4jp 0:685224d2f66d 291 for(i = 0; i < FWCACHE_SIZE; ++i) {
ban4jp 0:685224d2f66d 292 if(fwcache[i].timer == 0) {
ban4jp 0:685224d2f66d 293 fw = &fwcache[i];
ban4jp 0:685224d2f66d 294 break;
ban4jp 0:685224d2f66d 295 } else if(fwcache[i].timer <= oldest) {
ban4jp 0:685224d2f66d 296 fw = &fwcache[i];
ban4jp 0:685224d2f66d 297 oldest = fwcache[i].timer;
ban4jp 0:685224d2f66d 298 }
ban4jp 0:685224d2f66d 299 }
ban4jp 0:685224d2f66d 300
ban4jp 0:685224d2f66d 301 fw->timer = FW_TIME;
ban4jp 0:685224d2f66d 302 fw->ipid = BUF->ipid;
ban4jp 0:685224d2f66d 303 fw->srcipaddr[0] = BUF->srcipaddr[0];
ban4jp 0:685224d2f66d 304 fw->srcipaddr[1] = BUF->srcipaddr[1];
ban4jp 0:685224d2f66d 305 fw->destipaddr[0] = BUF->destipaddr[0];
ban4jp 0:685224d2f66d 306 fw->destipaddr[1] = BUF->destipaddr[1];
ban4jp 0:685224d2f66d 307 fw->proto = BUF->proto;
ban4jp 0:685224d2f66d 308 #if notdef
ban4jp 0:685224d2f66d 309 fw->payload[0] = BUF->srcport;
ban4jp 0:685224d2f66d 310 fw->payload[1] = BUF->destport;
ban4jp 0:685224d2f66d 311 #endif
ban4jp 0:685224d2f66d 312 #if UIP_REASSEMBLY > 0
ban4jp 0:685224d2f66d 313 fw->len = BUF->len;
ban4jp 0:685224d2f66d 314 fw->offset = BUF->ipoffset;
ban4jp 0:685224d2f66d 315 #endif
ban4jp 0:685224d2f66d 316 }
ban4jp 0:685224d2f66d 317 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 318 /**
ban4jp 0:685224d2f66d 319 * \internal
ban4jp 0:685224d2f66d 320 * Find a network interface for the IP packet in uip_buf.
ban4jp 0:685224d2f66d 321 */
ban4jp 0:685224d2f66d 322 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 323 static struct uip_fw_netif *
ban4jp 0:685224d2f66d 324 find_netif(void)
ban4jp 0:685224d2f66d 325 {
ban4jp 0:685224d2f66d 326 struct uip_fw_netif *netif;
ban4jp 0:685224d2f66d 327
ban4jp 0:685224d2f66d 328 /* Walk through every network interface to check for a match. */
ban4jp 0:685224d2f66d 329 for(netif = netifs; netif != NULL; netif = netif->next) {
ban4jp 0:685224d2f66d 330 if(ipaddr_maskcmp(BUF->destipaddr, netif->ipaddr,
ban4jp 0:685224d2f66d 331 netif->netmask)) {
ban4jp 0:685224d2f66d 332 /* If there was a match, we break the loop. */
ban4jp 0:685224d2f66d 333 return netif;
ban4jp 0:685224d2f66d 334 }
ban4jp 0:685224d2f66d 335 }
ban4jp 0:685224d2f66d 336
ban4jp 0:685224d2f66d 337 /* If no matching netif was found, we use default netif. */
ban4jp 0:685224d2f66d 338 return defaultnetif;
ban4jp 0:685224d2f66d 339 }
ban4jp 0:685224d2f66d 340 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 341 /**
ban4jp 0:685224d2f66d 342 * Output an IP packet on the correct network interface.
ban4jp 0:685224d2f66d 343 *
ban4jp 0:685224d2f66d 344 * The IP packet should be present in the uip_buf buffer and its
ban4jp 0:685224d2f66d 345 * length in the global uip_len variable.
ban4jp 0:685224d2f66d 346 *
ban4jp 0:685224d2f66d 347 * \retval UIP_FW_ZEROLEN Indicates that a zero-length packet
ban4jp 0:685224d2f66d 348 * transmission was attempted and that no packet was sent.
ban4jp 0:685224d2f66d 349 *
ban4jp 0:685224d2f66d 350 * \retval UIP_FW_NOROUTE No suitable network interface could be found
ban4jp 0:685224d2f66d 351 * for the outbound packet, and the packet was not sent.
ban4jp 0:685224d2f66d 352 *
ban4jp 0:685224d2f66d 353 * \return The return value from the actual network interface output
ban4jp 0:685224d2f66d 354 * function is passed unmodified as a return value.
ban4jp 0:685224d2f66d 355 */
ban4jp 0:685224d2f66d 356 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 357 u8_t
ban4jp 0:685224d2f66d 358 uip_fw_output(void)
ban4jp 0:685224d2f66d 359 {
ban4jp 0:685224d2f66d 360 struct uip_fw_netif *netif;
ban4jp 0:685224d2f66d 361
ban4jp 0:685224d2f66d 362 if(uip_len == 0) {
ban4jp 0:685224d2f66d 363 return UIP_FW_ZEROLEN;
ban4jp 0:685224d2f66d 364 }
ban4jp 0:685224d2f66d 365
ban4jp 0:685224d2f66d 366 fwcache_register();
ban4jp 0:685224d2f66d 367
ban4jp 0:685224d2f66d 368 #if UIP_BROADCAST
ban4jp 0:685224d2f66d 369 /* Link local broadcasts go out on all interfaces. */
ban4jp 0:685224d2f66d 370 if(/*BUF->proto == UIP_PROTO_UDP &&*/
ban4jp 0:685224d2f66d 371 BUF->destipaddr[0] == 0xffff &&
ban4jp 0:685224d2f66d 372 BUF->destipaddr[1] == 0xffff) {
ban4jp 0:685224d2f66d 373 if(defaultnetif != NULL) {
ban4jp 0:685224d2f66d 374 defaultnetif->output();
ban4jp 0:685224d2f66d 375 }
ban4jp 0:685224d2f66d 376 for(netif = netifs; netif != NULL; netif = netif->next) {
ban4jp 0:685224d2f66d 377 netif->output();
ban4jp 0:685224d2f66d 378 }
ban4jp 0:685224d2f66d 379 return UIP_FW_OK;
ban4jp 0:685224d2f66d 380 }
ban4jp 0:685224d2f66d 381 #endif /* UIP_BROADCAST */
ban4jp 0:685224d2f66d 382
ban4jp 0:685224d2f66d 383 netif = find_netif();
ban4jp 0:685224d2f66d 384 /* printf("uip_fw_output: netif %p ->output %p len %d\n", netif,
ban4jp 0:685224d2f66d 385 netif->output,
ban4jp 0:685224d2f66d 386 uip_len);*/
ban4jp 0:685224d2f66d 387
ban4jp 0:685224d2f66d 388 if(netif == NULL) {
ban4jp 0:685224d2f66d 389 return UIP_FW_NOROUTE;
ban4jp 0:685224d2f66d 390 }
ban4jp 0:685224d2f66d 391 /* If we now have found a suitable network interface, we call its
ban4jp 0:685224d2f66d 392 output function to send out the packet. */
ban4jp 0:685224d2f66d 393 return netif->output();
ban4jp 0:685224d2f66d 394 }
ban4jp 0:685224d2f66d 395 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 396 /**
ban4jp 0:685224d2f66d 397 * Forward an IP packet in the uip_buf buffer.
ban4jp 0:685224d2f66d 398 *
ban4jp 0:685224d2f66d 399 *
ban4jp 0:685224d2f66d 400 *
ban4jp 0:685224d2f66d 401 * \return UIP_FW_FORWARDED if the packet was forwarded, UIP_FW_LOCAL if
ban4jp 0:685224d2f66d 402 * the packet should be processed locally.
ban4jp 0:685224d2f66d 403 */
ban4jp 0:685224d2f66d 404 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 405 u8_t
ban4jp 0:685224d2f66d 406 uip_fw_forward(void)
ban4jp 0:685224d2f66d 407 {
ban4jp 0:685224d2f66d 408 struct fwcache_entry *fw;
ban4jp 0:685224d2f66d 409
ban4jp 0:685224d2f66d 410 /* First check if the packet is destined for ourselves and return 0
ban4jp 0:685224d2f66d 411 to indicate that the packet should be processed locally. */
ban4jp 0:685224d2f66d 412 if(BUF->destipaddr[0] == uip_hostaddr[0] &&
ban4jp 0:685224d2f66d 413 BUF->destipaddr[1] == uip_hostaddr[1]) {
ban4jp 0:685224d2f66d 414 return UIP_FW_LOCAL;
ban4jp 0:685224d2f66d 415 }
ban4jp 0:685224d2f66d 416
ban4jp 0:685224d2f66d 417 /* If we use ping IP address configuration, and our IP address is
ban4jp 0:685224d2f66d 418 not yet configured, we should intercept all ICMP echo packets. */
ban4jp 0:685224d2f66d 419 #if UIP_PINGADDRCONF
ban4jp 0:685224d2f66d 420 if((uip_hostaddr[0] | uip_hostaddr[1]) == 0 &&
ban4jp 0:685224d2f66d 421 BUF->proto == UIP_PROTO_ICMP &&
ban4jp 0:685224d2f66d 422 ICMPBUF->type == ICMP_ECHO) {
ban4jp 0:685224d2f66d 423 return UIP_FW_LOCAL;
ban4jp 0:685224d2f66d 424 }
ban4jp 0:685224d2f66d 425 #endif /* UIP_PINGADDRCONF */
ban4jp 0:685224d2f66d 426
ban4jp 0:685224d2f66d 427 /* Check if the packet is in the forwarding cache already, and if so
ban4jp 0:685224d2f66d 428 we drop it. */
ban4jp 0:685224d2f66d 429
ban4jp 0:685224d2f66d 430 for(fw = fwcache; fw < &fwcache[FWCACHE_SIZE]; ++fw) {
ban4jp 0:685224d2f66d 431 if(fw->timer != 0 &&
ban4jp 0:685224d2f66d 432 #if UIP_REASSEMBLY > 0
ban4jp 0:685224d2f66d 433 fw->len == BUF->len &&
ban4jp 0:685224d2f66d 434 fw->offset == BUF->ipoffset &&
ban4jp 0:685224d2f66d 435 #endif
ban4jp 0:685224d2f66d 436 fw->ipid == BUF->ipid &&
ban4jp 0:685224d2f66d 437 fw->srcipaddr[0] == BUF->srcipaddr[0] &&
ban4jp 0:685224d2f66d 438 fw->srcipaddr[1] == BUF->srcipaddr[1] &&
ban4jp 0:685224d2f66d 439 fw->destipaddr[0] == BUF->destipaddr[0] &&
ban4jp 0:685224d2f66d 440 fw->destipaddr[1] == BUF->destipaddr[1] &&
ban4jp 0:685224d2f66d 441 #if notdef
ban4jp 0:685224d2f66d 442 fw->payload[0] == BUF->srcport &&
ban4jp 0:685224d2f66d 443 fw->payload[1] == BUF->destport &&
ban4jp 0:685224d2f66d 444 #endif
ban4jp 0:685224d2f66d 445 fw->proto == BUF->proto) {
ban4jp 0:685224d2f66d 446 /* Drop packet. */
ban4jp 0:685224d2f66d 447 return UIP_FW_FORWARDED;
ban4jp 0:685224d2f66d 448 }
ban4jp 0:685224d2f66d 449 }
ban4jp 0:685224d2f66d 450
ban4jp 0:685224d2f66d 451 /* If the TTL reaches zero we produce an ICMP time exceeded message
ban4jp 0:685224d2f66d 452 in the uip_buf buffer and forward that packet back to the sender
ban4jp 0:685224d2f66d 453 of the packet. */
ban4jp 0:685224d2f66d 454 if(BUF->ttl <= 1) {
ban4jp 0:685224d2f66d 455 /* No time exceeded for broadcasts and multicasts! */
ban4jp 0:685224d2f66d 456 if(BUF->destipaddr[0] == 0xffff && BUF->destipaddr[1] == 0xffff) {
ban4jp 0:685224d2f66d 457 return UIP_FW_LOCAL;
ban4jp 0:685224d2f66d 458 }
ban4jp 0:685224d2f66d 459 time_exceeded();
ban4jp 0:685224d2f66d 460 }
ban4jp 0:685224d2f66d 461
ban4jp 0:685224d2f66d 462 /* Decrement the TTL (time-to-live) value in the IP header */
ban4jp 0:685224d2f66d 463 BUF->ttl = BUF->ttl - 1;
ban4jp 0:685224d2f66d 464
ban4jp 0:685224d2f66d 465 /* Update the IP checksum. */
ban4jp 0:685224d2f66d 466 if(BUF->ipchksum >= HTONS(0xffff - 0x0100)) {
ban4jp 0:685224d2f66d 467 BUF->ipchksum = BUF->ipchksum + HTONS(0x0100) + 1;
ban4jp 0:685224d2f66d 468 } else {
ban4jp 0:685224d2f66d 469 BUF->ipchksum = BUF->ipchksum + HTONS(0x0100);
ban4jp 0:685224d2f66d 470 }
ban4jp 0:685224d2f66d 471
ban4jp 0:685224d2f66d 472 if(uip_len > 0) {
ban4jp 0:685224d2f66d 473 uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_TCPIP_HLEN];
ban4jp 0:685224d2f66d 474 uip_fw_output();
ban4jp 0:685224d2f66d 475 }
ban4jp 0:685224d2f66d 476
ban4jp 0:685224d2f66d 477 #if UIP_BROADCAST
ban4jp 0:685224d2f66d 478 if(BUF->destipaddr[0] == 0xffff && BUF->destipaddr[1] == 0xffff) {
ban4jp 0:685224d2f66d 479 return UIP_FW_LOCAL;
ban4jp 0:685224d2f66d 480 }
ban4jp 0:685224d2f66d 481 #endif /* UIP_BROADCAST */
ban4jp 0:685224d2f66d 482
ban4jp 0:685224d2f66d 483 /* Return non-zero to indicate that the packet was forwarded and that no
ban4jp 0:685224d2f66d 484 other processing should be made. */
ban4jp 0:685224d2f66d 485 return UIP_FW_FORWARDED;
ban4jp 0:685224d2f66d 486 }
ban4jp 0:685224d2f66d 487 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 488 /**
ban4jp 0:685224d2f66d 489 * Register a network interface with the forwarding module.
ban4jp 0:685224d2f66d 490 *
ban4jp 0:685224d2f66d 491 * \param netif A pointer to the network interface that is to be
ban4jp 0:685224d2f66d 492 * registered.
ban4jp 0:685224d2f66d 493 */
ban4jp 0:685224d2f66d 494 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 495 void
ban4jp 0:685224d2f66d 496 uip_fw_register(struct uip_fw_netif *netif)
ban4jp 0:685224d2f66d 497 {
ban4jp 0:685224d2f66d 498 netif->next = netifs;
ban4jp 0:685224d2f66d 499 netifs = netif;
ban4jp 0:685224d2f66d 500 }
ban4jp 0:685224d2f66d 501 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 502 /**
ban4jp 0:685224d2f66d 503 * Register a default network interface.
ban4jp 0:685224d2f66d 504 *
ban4jp 0:685224d2f66d 505 * All packets that don't go out on any of the other interfaces will
ban4jp 0:685224d2f66d 506 * be routed to the default interface.
ban4jp 0:685224d2f66d 507 *
ban4jp 0:685224d2f66d 508 * \param netif A pointer to the network interface that is to be
ban4jp 0:685224d2f66d 509 * registered.
ban4jp 0:685224d2f66d 510 */
ban4jp 0:685224d2f66d 511 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 512 void
ban4jp 0:685224d2f66d 513 uip_fw_default(struct uip_fw_netif *netif)
ban4jp 0:685224d2f66d 514 {
ban4jp 0:685224d2f66d 515 defaultnetif = netif;
ban4jp 0:685224d2f66d 516 }
ban4jp 0:685224d2f66d 517 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 518 /**
ban4jp 0:685224d2f66d 519 * Perform periodic processing.
ban4jp 0:685224d2f66d 520 */
ban4jp 0:685224d2f66d 521 /*------------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 522 void
ban4jp 0:685224d2f66d 523 uip_fw_periodic(void)
ban4jp 0:685224d2f66d 524 {
ban4jp 0:685224d2f66d 525 struct fwcache_entry *fw;
ban4jp 0:685224d2f66d 526 for(fw = fwcache; fw < &fwcache[FWCACHE_SIZE]; ++fw) {
ban4jp 0:685224d2f66d 527 if(fw->timer > 0) {
ban4jp 0:685224d2f66d 528 --fw->timer;
ban4jp 0:685224d2f66d 529 }
ban4jp 0:685224d2f66d 530 }
ban4jp 0:685224d2f66d 531 }
ban4jp 0:685224d2f66d 532 /*------------------------------------------------------------------------------*/