3 * This is the IPv4 layer implementation for incoming and outgoing IP traffic.
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10 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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11 * All rights reserved.
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13 * Redistribution and use in source and binary forms, with or without modification,
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14 * are permitted provided that the following conditions are met:
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16 * 1. Redistributions of source code must retain the above copyright notice,
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17 * this list of conditions and the following disclaimer.
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18 * 2. Redistributions in binary form must reproduce the above copyright notice,
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19 * this list of conditions and the following disclaimer in the documentation
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20 * and/or other materials provided with the distribution.
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21 * 3. The name of the author may not be used to endorse or promote products
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22 * derived from this software without specific prior written permission.
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24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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35 * This file is part of the lwIP TCP/IP stack.
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37 * Author: Adam Dunkels <adam@sics.se>
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41 #include "lwip/opt.h"
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42 #include "lwip/ip.h"
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43 #include "lwip/def.h"
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44 #include "lwip/mem.h"
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45 #include "lwip/ip_frag.h"
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46 #include "lwip/inet.h"
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47 #include "lwip/inet_chksum.h"
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48 #include "lwip/netif.h"
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49 #include "lwip/icmp.h"
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50 #include "lwip/igmp.h"
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51 #include "lwip/raw.h"
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52 #include "lwip/udp.h"
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53 #include "lwip/tcp.h"
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54 #include "lwip/snmp.h"
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55 #include "lwip/dhcp.h"
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56 #include "lwip/stats.h"
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57 #include "arch/perf.h"
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60 * Finds the appropriate network interface for a given IP address. It
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61 * searches the list of network interfaces linearly. A match is found
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62 * if the masked IP address of the network interface equals the masked
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63 * IP address given to the function.
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65 * @param dest the destination IP address for which to find the route
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66 * @return the netif on which to send to reach dest
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69 ip_route(struct ip_addr *dest)
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71 struct netif *netif;
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73 /* iterate through netifs */
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74 for(netif = netif_list; netif != NULL; netif = netif->next) {
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75 /* network mask matches? */
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76 if (netif_is_up(netif)) {
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77 if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
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78 /* return netif on which to forward IP packet */
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83 if ((netif_default == NULL) || (!netif_is_up(netif_default))) {
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84 LWIP_DEBUGF(IP_DEBUG | 2, ("ip_route: No route to 0x%"X32_F"\n", dest->addr));
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85 IP_STATS_INC(ip.rterr);
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86 snmp_inc_ipoutnoroutes();
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89 /* no matching netif found, use default netif */
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90 return netif_default;
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95 * Forwards an IP packet. It finds an appropriate route for the
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96 * packet, decrements the TTL value of the packet, adjusts the
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97 * checksum and outputs the packet on the appropriate interface.
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99 * @param p the packet to forward (p->payload points to IP header)
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100 * @param iphdr the IP header of the input packet
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101 * @param inp the netif on which this packet was received
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102 * @return the netif on which the packet was sent (NULL if it wasn't sent)
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104 static struct netif *
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105 ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
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107 struct netif *netif;
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110 /* Find network interface where to forward this IP packet to. */
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111 netif = ip_route((struct ip_addr *)&(iphdr->dest));
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112 if (netif == NULL) {
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113 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for 0x%"X32_F" found\n",
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114 iphdr->dest.addr));
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115 snmp_inc_ipoutnoroutes();
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116 return (struct netif *)NULL;
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118 /* Do not forward packets onto the same network interface on which
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120 if (netif == inp) {
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121 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
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122 snmp_inc_ipoutnoroutes();
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123 return (struct netif *)NULL;
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126 /* decrement TTL */
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127 IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
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128 /* send ICMP if TTL == 0 */
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129 if (IPH_TTL(iphdr) == 0) {
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130 snmp_inc_ipinhdrerrors();
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132 /* Don't send ICMP messages in response to ICMP messages */
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133 if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
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134 icmp_time_exceeded(p, ICMP_TE_TTL);
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136 #endif /* LWIP_ICMP */
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137 return (struct netif *)NULL;
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140 /* Incrementally update the IP checksum. */
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141 if (IPH_CHKSUM(iphdr) >= htons(0xffff - 0x100)) {
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142 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100) + 1);
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144 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100));
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147 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to 0x%"X32_F"\n",
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148 iphdr->dest.addr));
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150 IP_STATS_INC(ip.fw);
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151 IP_STATS_INC(ip.xmit);
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152 snmp_inc_ipforwdatagrams();
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154 PERF_STOP("ip_forward");
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155 /* transmit pbuf on chosen interface */
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156 netif->output(netif, p, (struct ip_addr *)&(iphdr->dest));
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159 #endif /* IP_FORWARD */
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162 * This function is called by the network interface device driver when
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163 * an IP packet is received. The function does the basic checks of the
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164 * IP header such as packet size being at least larger than the header
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165 * size etc. If the packet was not destined for us, the packet is
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166 * forwarded (using ip_forward). The IP checksum is always checked.
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168 * Finally, the packet is sent to the upper layer protocol input function.
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170 * @param p the received IP packet (p->payload points to IP header)
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171 * @param inp the netif on which this packet was received
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172 * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
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173 * processed, but currently always returns ERR_OK)
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176 ip_input(struct pbuf *p, struct netif *inp)
\r
178 struct ip_hdr *iphdr;
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179 struct netif *netif;
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183 int check_ip_src=1;
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184 #endif /* LWIP_DHCP */
\r
186 IP_STATS_INC(ip.recv);
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187 snmp_inc_ipinreceives();
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189 /* identify the IP header */
\r
190 iphdr = p->payload;
\r
191 if (IPH_V(iphdr) != 4) {
\r
192 LWIP_DEBUGF(IP_DEBUG | 1, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
\r
195 IP_STATS_INC(ip.err);
\r
196 IP_STATS_INC(ip.drop);
\r
197 snmp_inc_ipinhdrerrors();
\r
201 /* obtain IP header length in number of 32-bit words */
\r
202 iphdr_hlen = IPH_HL(iphdr);
\r
203 /* calculate IP header length in bytes */
\r
205 /* obtain ip length in bytes */
\r
206 iphdr_len = ntohs(IPH_LEN(iphdr));
\r
208 /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
\r
209 if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len)) {
\r
210 if (iphdr_hlen > p->len)
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211 LWIP_DEBUGF(IP_DEBUG | 2, ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
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212 iphdr_hlen, p->len));
\r
213 if (iphdr_len > p->tot_len)
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214 LWIP_DEBUGF(IP_DEBUG | 2, ("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), "
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215 "IP packet dropped.\n",
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216 iphdr_len, p->tot_len));
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217 /* free (drop) packet pbufs */
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219 IP_STATS_INC(ip.lenerr);
\r
220 IP_STATS_INC(ip.drop);
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221 snmp_inc_ipindiscards();
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225 /* verify checksum */
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226 #if CHECKSUM_CHECK_IP
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227 if (inet_chksum(iphdr, iphdr_hlen) != 0) {
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229 LWIP_DEBUGF(IP_DEBUG | 2, ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
\r
232 IP_STATS_INC(ip.chkerr);
\r
233 IP_STATS_INC(ip.drop);
\r
234 snmp_inc_ipinhdrerrors();
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239 /* Trim pbuf. This should have been done at the netif layer,
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240 * but we'll do it anyway just to be sure that its done. */
\r
241 pbuf_realloc(p, iphdr_len);
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243 /* match packet against an interface, i.e. is this packet for us? */
\r
245 if (ip_addr_ismulticast(&(iphdr->dest))) {
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246 if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &(iphdr->dest)))) {
\r
252 #endif /* LWIP_IGMP */
\r
254 /* start trying with inp. if that's not acceptable, start walking the
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255 list of configured netifs.
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256 'first' is used as a boolean to mark whether we started walking the list */
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260 LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest 0x%"X32_F" netif->ip_addr 0x%"X32_F" (0x%"X32_F", 0x%"X32_F", 0x%"X32_F")\n",
\r
261 iphdr->dest.addr, netif->ip_addr.addr,
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262 iphdr->dest.addr & netif->netmask.addr,
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263 netif->ip_addr.addr & netif->netmask.addr,
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264 iphdr->dest.addr & ~(netif->netmask.addr)));
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266 /* interface is up and configured? */
\r
267 if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
\r
268 /* unicast to this interface address? */
\r
269 if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
\r
270 /* or broadcast on this interface network address? */
\r
271 ip_addr_isbroadcast(&(iphdr->dest), netif)) {
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272 LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
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273 netif->name[0], netif->name[1]));
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274 /* break out of for loop */
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280 netif = netif_list;
\r
282 netif = netif->next;
\r
284 if (netif == inp) {
\r
285 netif = netif->next;
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287 } while(netif != NULL);
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291 /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
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292 * using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
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293 * According to RFC 1542 section 3.1.1, referred by RFC 2131).
\r
295 if (netif == NULL) {
\r
296 /* remote port is DHCP server? */
\r
297 if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
\r
298 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
\r
299 ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen))->dest)));
\r
300 if (ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen))->dest) == DHCP_CLIENT_PORT) {
\r
301 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: DHCP packet accepted.\n"));
\r
307 #endif /* LWIP_DHCP */
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309 /* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
\r
312 #endif /* LWIP_DHCP */
\r
313 { if ((ip_addr_isbroadcast(&(iphdr->src), inp)) ||
\r
314 (ip_addr_ismulticast(&(iphdr->src)))) {
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315 /* packet source is not valid */
\r
316 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: packet source is not valid.\n"));
\r
317 /* free (drop) packet pbufs */
\r
319 IP_STATS_INC(ip.drop);
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320 snmp_inc_ipinaddrerrors();
\r
321 snmp_inc_ipindiscards();
\r
326 /* packet not for us? */
\r
327 if (netif == NULL) {
\r
328 /* packet not for us, route or discard */
\r
329 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: packet not for us.\n"));
\r
331 /* non-broadcast packet? */
\r
332 if (!ip_addr_isbroadcast(&(iphdr->dest), inp)) {
\r
333 /* try to forward IP packet on (other) interfaces */
\r
334 ip_forward(p, iphdr, inp);
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336 #endif /* IP_FORWARD */
\r
338 snmp_inc_ipinaddrerrors();
\r
339 snmp_inc_ipindiscards();
\r
344 /* packet consists of multiple fragments? */
\r
345 if ((IPH_OFFSET(iphdr) & htons(IP_OFFMASK | IP_MF)) != 0) {
\r
346 #if IP_REASSEMBLY /* packet fragment reassembly code present? */
\r
347 LWIP_DEBUGF(IP_DEBUG, ("IP packet is a fragment (id=0x%04"X16_F" tot_len=%"U16_F" len=%"U16_F" MF=%"U16_F" offset=%"U16_F"), calling ip_reass()\n",
\r
348 ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & htons(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)*8));
\r
349 /* reassemble the packet*/
\r
351 /* packet not fully reassembled yet? */
\r
355 iphdr = p->payload;
\r
356 #else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
\r
358 LWIP_DEBUGF(IP_DEBUG | 2, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
\r
359 ntohs(IPH_OFFSET(iphdr))));
\r
360 IP_STATS_INC(ip.opterr);
\r
361 IP_STATS_INC(ip.drop);
\r
362 /* unsupported protocol feature */
\r
363 snmp_inc_ipinunknownprotos();
\r
365 #endif /* IP_REASSEMBLY */
\r
368 #if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
\r
371 /* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
\r
372 if((iphdr_hlen > IP_HLEN && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
\r
374 if (iphdr_hlen > IP_HLEN) {
\r
375 #endif /* LWIP_IGMP */
\r
376 LWIP_DEBUGF(IP_DEBUG | 2, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
\r
378 IP_STATS_INC(ip.opterr);
\r
379 IP_STATS_INC(ip.drop);
\r
380 /* unsupported protocol feature */
\r
381 snmp_inc_ipinunknownprotos();
\r
384 #endif /* IP_OPTIONS_ALLOWED == 0 */
\r
386 /* send to upper layers */
\r
387 LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
\r
389 LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
\r
392 /* raw input did not eat the packet? */
\r
393 if (raw_input(p, inp) == 0)
\r
394 #endif /* LWIP_RAW */
\r
397 switch (IPH_PROTO(iphdr)) {
\r
401 case IP_PROTO_UDPLITE:
\r
402 #endif /* LWIP_UDPLITE */
\r
403 snmp_inc_ipindelivers();
\r
406 #endif /* LWIP_UDP */
\r
409 snmp_inc_ipindelivers();
\r
412 #endif /* LWIP_TCP */
\r
414 case IP_PROTO_ICMP:
\r
415 snmp_inc_ipindelivers();
\r
416 icmp_input(p, inp);
\r
418 #endif /* LWIP_ICMP */
\r
420 case IP_PROTO_IGMP:
\r
421 igmp_input(p,inp,&(iphdr->dest));
\r
423 #endif /* LWIP_IGMP */
\r
426 /* send ICMP destination protocol unreachable unless is was a broadcast */
\r
427 if (!ip_addr_isbroadcast(&(iphdr->dest), inp) &&
\r
428 !ip_addr_ismulticast(&(iphdr->dest))) {
\r
429 p->payload = iphdr;
\r
430 icmp_dest_unreach(p, ICMP_DUR_PROTO);
\r
432 #endif /* LWIP_ICMP */
\r
435 LWIP_DEBUGF(IP_DEBUG | 2, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
\r
437 IP_STATS_INC(ip.proterr);
\r
438 IP_STATS_INC(ip.drop);
\r
439 snmp_inc_ipinunknownprotos();
\r
447 * Sends an IP packet on a network interface. This function constructs
\r
448 * the IP header and calculates the IP header checksum. If the source
\r
449 * IP address is NULL, the IP address of the outgoing network
\r
450 * interface is filled in as source address.
\r
451 * If the destination IP address is IP_HDRINCL, p is assumed to already
\r
452 * include an IP header and p->payload points to it instead of the data.
\r
454 * @param p the packet to send (p->payload points to the data, e.g. next
\r
455 protocol header; if dest == IP_HDRINCL, p already includes an IP
\r
456 header and p->payload points to that IP header)
\r
457 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
\r
458 * IP address of the netif used to send is used as source address)
\r
459 * @param dest the destination IP address to send the packet to
\r
460 * @param ttl the TTL value to be set in the IP header
\r
461 * @param tos the TOS value to be set in the IP header
\r
462 * @param proto the PROTOCOL to be set in the IP header
\r
463 * @param netif the netif on which to send this packet
\r
464 * @return ERR_OK if the packet was sent OK
\r
465 * ERR_BUF if p doesn't have enough space for IP/LINK headers
\r
466 * returns errors returned by netif->output
\r
468 * @note ip_id: RFC791 "some host may be able to simply use
\r
469 * unique identifiers independent of destination"
\r
472 ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
\r
473 u8_t ttl, u8_t tos,
\r
474 u8_t proto, struct netif *netif)
\r
476 struct ip_hdr *iphdr;
\r
477 static u16_t ip_id = 0;
\r
479 snmp_inc_ipoutrequests();
\r
481 /* Should the IP header be generated or is it already included in p? */
\r
482 if (dest != IP_HDRINCL) {
\r
483 /* generate IP header */
\r
484 if (pbuf_header(p, IP_HLEN)) {
\r
485 LWIP_DEBUGF(IP_DEBUG | 2, ("ip_output: not enough room for IP header in pbuf\n"));
\r
487 IP_STATS_INC(ip.err);
\r
488 snmp_inc_ipoutdiscards();
\r
492 iphdr = p->payload;
\r
493 LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
\r
494 (p->len >= sizeof(struct ip_hdr)));
\r
496 IPH_TTL_SET(iphdr, ttl);
\r
497 IPH_PROTO_SET(iphdr, proto);
\r
499 ip_addr_set(&(iphdr->dest), dest);
\r
501 IPH_VHLTOS_SET(iphdr, 4, IP_HLEN / 4, tos);
\r
502 IPH_LEN_SET(iphdr, htons(p->tot_len));
\r
503 IPH_OFFSET_SET(iphdr, 0);
\r
504 IPH_ID_SET(iphdr, htons(ip_id));
\r
507 if (ip_addr_isany(src)) {
\r
508 ip_addr_set(&(iphdr->src), &(netif->ip_addr));
\r
510 ip_addr_set(&(iphdr->src), src);
\r
513 IPH_CHKSUM_SET(iphdr, 0);
\r
514 #if CHECKSUM_GEN_IP
\r
515 IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
\r
518 /* IP header already included in p */
\r
519 iphdr = p->payload;
\r
520 dest = &(iphdr->dest);
\r
524 /* don't fragment if interface has mtu set to 0 [loopif] */
\r
525 if (netif->mtu && (p->tot_len > netif->mtu))
\r
526 return ip_frag(p,netif,dest);
\r
529 IP_STATS_INC(ip.xmit);
\r
531 LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
\r
534 LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
\r
536 return netif->output(netif, p, dest);
\r
540 * Simple interface to ip_output_if. It finds the outgoing network
\r
541 * interface and calls upon ip_output_if to do the actual work.
\r
543 * @param p the packet to send (p->payload points to the data, e.g. next
\r
544 protocol header; if dest == IP_HDRINCL, p already includes an IP
\r
545 header and p->payload points to that IP header)
\r
546 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
\r
547 * IP address of the netif used to send is used as source address)
\r
548 * @param dest the destination IP address to send the packet to
\r
549 * @param ttl the TTL value to be set in the IP header
\r
550 * @param tos the TOS value to be set in the IP header
\r
551 * @param proto the PROTOCOL to be set in the IP header
\r
553 * @return ERR_RTE if no route is found
\r
554 * see ip_output_if() for more return values
\r
557 ip_output(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
\r
558 u8_t ttl, u8_t tos, u8_t proto)
\r
560 struct netif *netif;
\r
562 if ((netif = ip_route(dest)) == NULL) {
\r
566 return ip_output_if(p, src, dest, ttl, tos, proto, netif);
\r
570 /* Print an IP header by using LWIP_DEBUGF
\r
571 * @param p an IP packet, p->payload pointing to the IP header
\r
574 ip_debug_print(struct pbuf *p)
\r
576 struct ip_hdr *iphdr = p->payload;
\r
579 payload = (u8_t *)iphdr + IP_HLEN;
\r
581 LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
\r
582 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
\r
583 LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n",
\r
587 ntohs(IPH_LEN(iphdr))));
\r
588 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
\r
589 LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n",
\r
590 ntohs(IPH_ID(iphdr)),
\r
591 ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
\r
592 ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
\r
593 ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
\r
594 ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
\r
595 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
\r
596 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n",
\r
599 ntohs(IPH_CHKSUM(iphdr))));
\r
600 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
\r
601 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n",
\r
602 ip4_addr1(&iphdr->src),
\r
603 ip4_addr2(&iphdr->src),
\r
604 ip4_addr3(&iphdr->src),
\r
605 ip4_addr4(&iphdr->src)));
\r
606 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
\r
607 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n",
\r
608 ip4_addr1(&iphdr->dest),
\r
609 ip4_addr2(&iphdr->dest),
\r
610 ip4_addr3(&iphdr->dest),
\r
611 ip4_addr4(&iphdr->dest)));
\r
612 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
\r
614 #endif /* IP_DEBUG */
\r