Mihail Stoyanov / HTTPServer

My fork of the HTTPServer (working)

Dependents:   DGWWebServer LAN2

Core/lwIP/core/ipv4/ip.c@0:7a64fbb4069d, 2012-08-06 (annotated)

Committer:
screamer
Date:
Mon Aug 06 09:23:14 2012 +0000
Revision:
0:7a64fbb4069d
[mbed] converted /DGWWebServer/HTTPServer

Who changed what in which revision?

UserRevisionLine numberNew contents of line
screamer 0:7a64fbb4069d 1 /**
screamer 0:7a64fbb4069d 2 * @file
screamer 0:7a64fbb4069d 3 * This is the IPv4 layer implementation for incoming and outgoing IP traffic.
screamer 0:7a64fbb4069d 4 *
screamer 0:7a64fbb4069d 5 * @see ip_frag.c
screamer 0:7a64fbb4069d 6 *
screamer 0:7a64fbb4069d 7 */
screamer 0:7a64fbb4069d 8
screamer 0:7a64fbb4069d 9 /*
screamer 0:7a64fbb4069d 10 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
screamer 0:7a64fbb4069d 11 * All rights reserved.
screamer 0:7a64fbb4069d 12 *
screamer 0:7a64fbb4069d 13 * Redistribution and use in source and binary forms, with or without modification,
screamer 0:7a64fbb4069d 14 * are permitted provided that the following conditions are met:
screamer 0:7a64fbb4069d 15 *
screamer 0:7a64fbb4069d 16 * 1. Redistributions of source code must retain the above copyright notice,
screamer 0:7a64fbb4069d 17 * this list of conditions and the following disclaimer.
screamer 0:7a64fbb4069d 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
screamer 0:7a64fbb4069d 19 * this list of conditions and the following disclaimer in the documentation
screamer 0:7a64fbb4069d 20 * and/or other materials provided with the distribution.
screamer 0:7a64fbb4069d 21 * 3. The name of the author may not be used to endorse or promote products
screamer 0:7a64fbb4069d 22 * derived from this software without specific prior written permission.
screamer 0:7a64fbb4069d 23 *
screamer 0:7a64fbb4069d 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
screamer 0:7a64fbb4069d 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
screamer 0:7a64fbb4069d 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
screamer 0:7a64fbb4069d 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
screamer 0:7a64fbb4069d 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
screamer 0:7a64fbb4069d 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
screamer 0:7a64fbb4069d 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
screamer 0:7a64fbb4069d 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
screamer 0:7a64fbb4069d 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
screamer 0:7a64fbb4069d 33 * OF SUCH DAMAGE.
screamer 0:7a64fbb4069d 34 *
screamer 0:7a64fbb4069d 35 * This file is part of the lwIP TCP/IP stack.
screamer 0:7a64fbb4069d 36 *
screamer 0:7a64fbb4069d 37 * Author: Adam Dunkels <adam@sics.se>
screamer 0:7a64fbb4069d 38 *
screamer 0:7a64fbb4069d 39 */
screamer 0:7a64fbb4069d 40
screamer 0:7a64fbb4069d 41 #include "lwip/opt.h"
screamer 0:7a64fbb4069d 42 #include "lwip/ip.h"
screamer 0:7a64fbb4069d 43 #include "lwip/def.h"
screamer 0:7a64fbb4069d 44 #include "lwip/mem.h"
screamer 0:7a64fbb4069d 45 #include "lwip/ip_frag.h"
screamer 0:7a64fbb4069d 46 #include "lwip/inet.h"
screamer 0:7a64fbb4069d 47 #include "lwip/inet_chksum.h"
screamer 0:7a64fbb4069d 48 #include "lwip/netif.h"
screamer 0:7a64fbb4069d 49 #include "lwip/icmp.h"
screamer 0:7a64fbb4069d 50 #include "lwip/igmp.h"
screamer 0:7a64fbb4069d 51 #include "lwip/raw.h"
screamer 0:7a64fbb4069d 52 #include "lwip/udp.h"
screamer 0:7a64fbb4069d 53 #include "lwip/tcp.h"
screamer 0:7a64fbb4069d 54 #include "lwip/snmp.h"
screamer 0:7a64fbb4069d 55 #include "lwip/dhcp.h"
screamer 0:7a64fbb4069d 56 #include "lwip/stats.h"
screamer 0:7a64fbb4069d 57 #include "arch/perf.h"
screamer 0:7a64fbb4069d 58
screamer 0:7a64fbb4069d 59 /**
screamer 0:7a64fbb4069d 60 * Finds the appropriate network interface for a given IP address. It
screamer 0:7a64fbb4069d 61 * searches the list of network interfaces linearly. A match is found
screamer 0:7a64fbb4069d 62 * if the masked IP address of the network interface equals the masked
screamer 0:7a64fbb4069d 63 * IP address given to the function.
screamer 0:7a64fbb4069d 64 *
screamer 0:7a64fbb4069d 65 * @param dest the destination IP address for which to find the route
screamer 0:7a64fbb4069d 66 * @return the netif on which to send to reach dest
screamer 0:7a64fbb4069d 67 */
screamer 0:7a64fbb4069d 68 struct netif *
screamer 0:7a64fbb4069d 69 ip_route(struct ip_addr *dest)
screamer 0:7a64fbb4069d 70 {
screamer 0:7a64fbb4069d 71 struct netif *netif;
screamer 0:7a64fbb4069d 72
screamer 0:7a64fbb4069d 73 /* iterate through netifs */
screamer 0:7a64fbb4069d 74 for(netif = netif_list; netif != NULL; netif = netif->next) {
screamer 0:7a64fbb4069d 75 /* network mask matches? */
screamer 0:7a64fbb4069d 76 if (netif_is_up(netif)) {
screamer 0:7a64fbb4069d 77 if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
screamer 0:7a64fbb4069d 78 /* return netif on which to forward IP packet */
screamer 0:7a64fbb4069d 79 return netif;
screamer 0:7a64fbb4069d 80 }
screamer 0:7a64fbb4069d 81 }
screamer 0:7a64fbb4069d 82 }
screamer 0:7a64fbb4069d 83 if ((netif_default == NULL) || (!netif_is_up(netif_default))) {
screamer 0:7a64fbb4069d 84 LWIP_DEBUGF(IP_DEBUG | 2, ("ip_route: No route to 0x%"X32_F"\n", dest->addr));
screamer 0:7a64fbb4069d 85 IP_STATS_INC(ip.rterr);
screamer 0:7a64fbb4069d 86 snmp_inc_ipoutnoroutes();
screamer 0:7a64fbb4069d 87 return (struct netif *)(NULL); // static_cast<struct netif *>(x)
screamer 0:7a64fbb4069d 88 }
screamer 0:7a64fbb4069d 89 /* no matching netif found, use default netif */
screamer 0:7a64fbb4069d 90 return netif_default;
screamer 0:7a64fbb4069d 91 }
screamer 0:7a64fbb4069d 92
screamer 0:7a64fbb4069d 93 #if IP_FORWARD
screamer 0:7a64fbb4069d 94 /**
screamer 0:7a64fbb4069d 95 * Forwards an IP packet. It finds an appropriate route for the
screamer 0:7a64fbb4069d 96 * packet, decrements the TTL value of the packet, adjusts the
screamer 0:7a64fbb4069d 97 * checksum and outputs the packet on the appropriate interface.
screamer 0:7a64fbb4069d 98 *
screamer 0:7a64fbb4069d 99 * @param p the packet to forward (p->payload points to IP header)
screamer 0:7a64fbb4069d 100 * @param iphdr the IP header of the input packet
screamer 0:7a64fbb4069d 101 * @param inp the netif on which this packet was received
screamer 0:7a64fbb4069d 102 * @return the netif on which the packet was sent (NULL if it wasn't sent)
screamer 0:7a64fbb4069d 103 */
screamer 0:7a64fbb4069d 104 static struct netif *
screamer 0:7a64fbb4069d 105 ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
screamer 0:7a64fbb4069d 106 {
screamer 0:7a64fbb4069d 107 struct netif *netif;
screamer 0:7a64fbb4069d 108
screamer 0:7a64fbb4069d 109 PERF_START;
screamer 0:7a64fbb4069d 110 /* Find network interface where to forward this IP packet to. */
screamer 0:7a64fbb4069d 111 netif = ip_route((struct ip_addr *)&(iphdr->dest));
screamer 0:7a64fbb4069d 112 if (netif == NULL) {
screamer 0:7a64fbb4069d 113 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for 0x%"X32_F" found\n",
screamer 0:7a64fbb4069d 114 iphdr->dest.addr));
screamer 0:7a64fbb4069d 115 snmp_inc_ipoutnoroutes();
screamer 0:7a64fbb4069d 116 return (struct netif *)NULL;
screamer 0:7a64fbb4069d 117 }
screamer 0:7a64fbb4069d 118 /* Do not forward packets onto the same network interface on which
screamer 0:7a64fbb4069d 119 * they arrived. */
screamer 0:7a64fbb4069d 120 if (netif == inp) {
screamer 0:7a64fbb4069d 121 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
screamer 0:7a64fbb4069d 122 snmp_inc_ipoutnoroutes();
screamer 0:7a64fbb4069d 123 return (struct netif *)NULL;
screamer 0:7a64fbb4069d 124 }
screamer 0:7a64fbb4069d 125
screamer 0:7a64fbb4069d 126 /* decrement TTL */
screamer 0:7a64fbb4069d 127 IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
screamer 0:7a64fbb4069d 128 /* send ICMP if TTL == 0 */
screamer 0:7a64fbb4069d 129 if (IPH_TTL(iphdr) == 0) {
screamer 0:7a64fbb4069d 130 snmp_inc_ipinhdrerrors();
screamer 0:7a64fbb4069d 131 #if LWIP_ICMP
screamer 0:7a64fbb4069d 132 /* Don't send ICMP messages in response to ICMP messages */
screamer 0:7a64fbb4069d 133 if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
screamer 0:7a64fbb4069d 134 icmp_time_exceeded(p, ICMP_TE_TTL);
screamer 0:7a64fbb4069d 135 }
screamer 0:7a64fbb4069d 136 #endif /* LWIP_ICMP */
screamer 0:7a64fbb4069d 137 return (struct netif *)NULL;
screamer 0:7a64fbb4069d 138 }
screamer 0:7a64fbb4069d 139
screamer 0:7a64fbb4069d 140 /* Incrementally update the IP checksum. */
screamer 0:7a64fbb4069d 141 if (IPH_CHKSUM(iphdr) >= htons(0xffff - 0x100)) {
screamer 0:7a64fbb4069d 142 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100) + 1);
screamer 0:7a64fbb4069d 143 } else {
screamer 0:7a64fbb4069d 144 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100));
screamer 0:7a64fbb4069d 145 }
screamer 0:7a64fbb4069d 146
screamer 0:7a64fbb4069d 147 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to 0x%"X32_F"\n",
screamer 0:7a64fbb4069d 148 iphdr->dest.addr));
screamer 0:7a64fbb4069d 149
screamer 0:7a64fbb4069d 150 IP_STATS_INC(ip.fw);
screamer 0:7a64fbb4069d 151 IP_STATS_INC(ip.xmit);
screamer 0:7a64fbb4069d 152 snmp_inc_ipforwdatagrams();
screamer 0:7a64fbb4069d 153
screamer 0:7a64fbb4069d 154 PERF_STOP("ip_forward");
screamer 0:7a64fbb4069d 155 /* transmit pbuf on chosen interface */
screamer 0:7a64fbb4069d 156 netif->output(netif, p, (struct ip_addr *)&(iphdr->dest));
screamer 0:7a64fbb4069d 157 return netif;
screamer 0:7a64fbb4069d 158 }
screamer 0:7a64fbb4069d 159 #endif /* IP_FORWARD */
screamer 0:7a64fbb4069d 160
screamer 0:7a64fbb4069d 161 /**
screamer 0:7a64fbb4069d 162 * This function is called by the network interface device driver when
screamer 0:7a64fbb4069d 163 * an IP packet is received. The function does the basic checks of the
screamer 0:7a64fbb4069d 164 * IP header such as packet size being at least larger than the header
screamer 0:7a64fbb4069d 165 * size etc. If the packet was not destined for us, the packet is
screamer 0:7a64fbb4069d 166 * forwarded (using ip_forward). The IP checksum is always checked.
screamer 0:7a64fbb4069d 167 *
screamer 0:7a64fbb4069d 168 * Finally, the packet is sent to the upper layer protocol input function.
screamer 0:7a64fbb4069d 169 *
screamer 0:7a64fbb4069d 170 * @param p the received IP packet (p->payload points to IP header)
screamer 0:7a64fbb4069d 171 * @param inp the netif on which this packet was received
screamer 0:7a64fbb4069d 172 * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
screamer 0:7a64fbb4069d 173 * processed, but currently always returns ERR_OK)
screamer 0:7a64fbb4069d 174 */
screamer 0:7a64fbb4069d 175 err_t
screamer 0:7a64fbb4069d 176 ip_input(struct pbuf *p, struct netif *inp)
screamer 0:7a64fbb4069d 177 {
screamer 0:7a64fbb4069d 178 struct ip_hdr *iphdr;
screamer 0:7a64fbb4069d 179 struct netif *netif;
screamer 0:7a64fbb4069d 180 u16_t iphdr_hlen;
screamer 0:7a64fbb4069d 181 u16_t iphdr_len;
screamer 0:7a64fbb4069d 182 #if LWIP_DHCP
screamer 0:7a64fbb4069d 183 int check_ip_src=1;
screamer 0:7a64fbb4069d 184 #endif /* LWIP_DHCP */
screamer 0:7a64fbb4069d 185
screamer 0:7a64fbb4069d 186 IP_STATS_INC(ip.recv);
screamer 0:7a64fbb4069d 187 snmp_inc_ipinreceives();
screamer 0:7a64fbb4069d 188
screamer 0:7a64fbb4069d 189 /* identify the IP header */
screamer 0:7a64fbb4069d 190 iphdr = (struct ip_hdr *)(p->payload); // static_cast<struct ip_hdr *>(x)
screamer 0:7a64fbb4069d 191 if (IPH_V(iphdr) != 4) {
screamer 0:7a64fbb4069d 192 LWIP_DEBUGF(IP_DEBUG | 1, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
screamer 0:7a64fbb4069d 193 ip_debug_print(p);
screamer 0:7a64fbb4069d 194 pbuf_free(p);
screamer 0:7a64fbb4069d 195 IP_STATS_INC(ip.err);
screamer 0:7a64fbb4069d 196 IP_STATS_INC(ip.drop);
screamer 0:7a64fbb4069d 197 snmp_inc_ipinhdrerrors();
screamer 0:7a64fbb4069d 198 return ERR_OK;
screamer 0:7a64fbb4069d 199 }
screamer 0:7a64fbb4069d 200
screamer 0:7a64fbb4069d 201 /* obtain IP header length in number of 32-bit words */
screamer 0:7a64fbb4069d 202 iphdr_hlen = IPH_HL(iphdr);
screamer 0:7a64fbb4069d 203 /* calculate IP header length in bytes */
screamer 0:7a64fbb4069d 204 iphdr_hlen *= 4;
screamer 0:7a64fbb4069d 205 /* obtain ip length in bytes */
screamer 0:7a64fbb4069d 206 iphdr_len = ntohs(IPH_LEN(iphdr));
screamer 0:7a64fbb4069d 207
screamer 0:7a64fbb4069d 208 /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
screamer 0:7a64fbb4069d 209 if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len)) {
screamer 0:7a64fbb4069d 210 if (iphdr_hlen > p->len)
screamer 0:7a64fbb4069d 211 LWIP_DEBUGF(IP_DEBUG | 2, ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
screamer 0:7a64fbb4069d 212 iphdr_hlen, p->len));
screamer 0:7a64fbb4069d 213 if (iphdr_len > p->tot_len)
screamer 0:7a64fbb4069d 214 LWIP_DEBUGF(IP_DEBUG | 2, ("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), "
screamer 0:7a64fbb4069d 215 "IP packet dropped.\n",
screamer 0:7a64fbb4069d 216 iphdr_len, p->tot_len));
screamer 0:7a64fbb4069d 217 /* free (drop) packet pbufs */
screamer 0:7a64fbb4069d 218 pbuf_free(p);
screamer 0:7a64fbb4069d 219 IP_STATS_INC(ip.lenerr);
screamer 0:7a64fbb4069d 220 IP_STATS_INC(ip.drop);
screamer 0:7a64fbb4069d 221 snmp_inc_ipindiscards();
screamer 0:7a64fbb4069d 222 return ERR_OK;
screamer 0:7a64fbb4069d 223 }
screamer 0:7a64fbb4069d 224
screamer 0:7a64fbb4069d 225 /* verify checksum */
screamer 0:7a64fbb4069d 226 #if CHECKSUM_CHECK_IP
screamer 0:7a64fbb4069d 227 if (inet_chksum(iphdr, iphdr_hlen) != 0) {
screamer 0:7a64fbb4069d 228
screamer 0:7a64fbb4069d 229 LWIP_DEBUGF(IP_DEBUG | 2, ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
screamer 0:7a64fbb4069d 230 ip_debug_print(p);
screamer 0:7a64fbb4069d 231 pbuf_free(p);
screamer 0:7a64fbb4069d 232 IP_STATS_INC(ip.chkerr);
screamer 0:7a64fbb4069d 233 IP_STATS_INC(ip.drop);
screamer 0:7a64fbb4069d 234 snmp_inc_ipinhdrerrors();
screamer 0:7a64fbb4069d 235 return ERR_OK;
screamer 0:7a64fbb4069d 236 }
screamer 0:7a64fbb4069d 237 #endif
screamer 0:7a64fbb4069d 238
screamer 0:7a64fbb4069d 239 /* Trim pbuf. This should have been done at the netif layer,
screamer 0:7a64fbb4069d 240 * but we'll do it anyway just to be sure that its done. */
screamer 0:7a64fbb4069d 241 pbuf_realloc(p, iphdr_len);
screamer 0:7a64fbb4069d 242
screamer 0:7a64fbb4069d 243 /* match packet against an interface, i.e. is this packet for us? */
screamer 0:7a64fbb4069d 244 #if LWIP_IGMP
screamer 0:7a64fbb4069d 245 if (ip_addr_ismulticast(&(iphdr->dest))) {
screamer 0:7a64fbb4069d 246 if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &(iphdr->dest)))) {
screamer 0:7a64fbb4069d 247 netif = inp;
screamer 0:7a64fbb4069d 248 } else {
screamer 0:7a64fbb4069d 249 netif = NULL;
screamer 0:7a64fbb4069d 250 }
screamer 0:7a64fbb4069d 251 } else
screamer 0:7a64fbb4069d 252 #endif /* LWIP_IGMP */
screamer 0:7a64fbb4069d 253 {
screamer 0:7a64fbb4069d 254 /* start trying with inp. if that's not acceptable, start walking the
screamer 0:7a64fbb4069d 255 list of configured netifs.
screamer 0:7a64fbb4069d 256 'first' is used as a boolean to mark whether we started walking the list */
screamer 0:7a64fbb4069d 257 int first = 1;
screamer 0:7a64fbb4069d 258 netif = inp;
screamer 0:7a64fbb4069d 259 do {
screamer 0:7a64fbb4069d 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",
screamer 0:7a64fbb4069d 261 iphdr->dest.addr, netif->ip_addr.addr,
screamer 0:7a64fbb4069d 262 iphdr->dest.addr & netif->netmask.addr,
screamer 0:7a64fbb4069d 263 netif->ip_addr.addr & netif->netmask.addr,
screamer 0:7a64fbb4069d 264 iphdr->dest.addr & ~(netif->netmask.addr)));
screamer 0:7a64fbb4069d 265
screamer 0:7a64fbb4069d 266 /* interface is up and configured? */
screamer 0:7a64fbb4069d 267 if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
screamer 0:7a64fbb4069d 268 /* unicast to this interface address? */
screamer 0:7a64fbb4069d 269 if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
screamer 0:7a64fbb4069d 270 /* or broadcast on this interface network address? */
screamer 0:7a64fbb4069d 271 ip_addr_isbroadcast(&(iphdr->dest), netif)) {
screamer 0:7a64fbb4069d 272 LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
screamer 0:7a64fbb4069d 273 netif->name[0], netif->name[1]));
screamer 0:7a64fbb4069d 274 /* break out of for loop */
screamer 0:7a64fbb4069d 275 break;
screamer 0:7a64fbb4069d 276 }
screamer 0:7a64fbb4069d 277 }
screamer 0:7a64fbb4069d 278 if (first) {
screamer 0:7a64fbb4069d 279 first = 0;
screamer 0:7a64fbb4069d 280 netif = netif_list;
screamer 0:7a64fbb4069d 281 } else {
screamer 0:7a64fbb4069d 282 netif = netif->next;
screamer 0:7a64fbb4069d 283 }
screamer 0:7a64fbb4069d 284 if (netif == inp) {
screamer 0:7a64fbb4069d 285 netif = netif->next;
screamer 0:7a64fbb4069d 286 }
screamer 0:7a64fbb4069d 287 } while(netif != NULL);
screamer 0:7a64fbb4069d 288 }
screamer 0:7a64fbb4069d 289
screamer 0:7a64fbb4069d 290 #if LWIP_DHCP
screamer 0:7a64fbb4069d 291 /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
screamer 0:7a64fbb4069d 292 * using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
screamer 0:7a64fbb4069d 293 * According to RFC 1542 section 3.1.1, referred by RFC 2131).
screamer 0:7a64fbb4069d 294 */
screamer 0:7a64fbb4069d 295 if (netif == NULL) {
screamer 0:7a64fbb4069d 296 /* remote port is DHCP server? */
screamer 0:7a64fbb4069d 297 if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
screamer 0:7a64fbb4069d 298 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
screamer 0:7a64fbb4069d 299 ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen))->dest)));
screamer 0:7a64fbb4069d 300 if (ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen))->dest) == DHCP_CLIENT_PORT) {
screamer 0:7a64fbb4069d 301 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: DHCP packet accepted.\n"));
screamer 0:7a64fbb4069d 302 netif = inp;
screamer 0:7a64fbb4069d 303 check_ip_src = 0;
screamer 0:7a64fbb4069d 304 }
screamer 0:7a64fbb4069d 305 }
screamer 0:7a64fbb4069d 306 }
screamer 0:7a64fbb4069d 307 #endif /* LWIP_DHCP */
screamer 0:7a64fbb4069d 308
screamer 0:7a64fbb4069d 309 /* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
screamer 0:7a64fbb4069d 310 #if LWIP_DHCP
screamer 0:7a64fbb4069d 311 if (check_ip_src)
screamer 0:7a64fbb4069d 312 #endif /* LWIP_DHCP */
screamer 0:7a64fbb4069d 313 { if ((ip_addr_isbroadcast(&(iphdr->src), inp)) ||
screamer 0:7a64fbb4069d 314 (ip_addr_ismulticast(&(iphdr->src)))) {
screamer 0:7a64fbb4069d 315 /* packet source is not valid */
screamer 0:7a64fbb4069d 316 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: packet source is not valid.\n"));
screamer 0:7a64fbb4069d 317 /* free (drop) packet pbufs */
screamer 0:7a64fbb4069d 318 pbuf_free(p);
screamer 0:7a64fbb4069d 319 IP_STATS_INC(ip.drop);
screamer 0:7a64fbb4069d 320 snmp_inc_ipinaddrerrors();
screamer 0:7a64fbb4069d 321 snmp_inc_ipindiscards();
screamer 0:7a64fbb4069d 322 return ERR_OK;
screamer 0:7a64fbb4069d 323 }
screamer 0:7a64fbb4069d 324 }
screamer 0:7a64fbb4069d 325
screamer 0:7a64fbb4069d 326 /* packet not for us? */
screamer 0:7a64fbb4069d 327 if (netif == NULL) {
screamer 0:7a64fbb4069d 328 /* packet not for us, route or discard */
screamer 0:7a64fbb4069d 329 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: packet not for us.\n"));
screamer 0:7a64fbb4069d 330 #if IP_FORWARD
screamer 0:7a64fbb4069d 331 /* non-broadcast packet? */
screamer 0:7a64fbb4069d 332 if (!ip_addr_isbroadcast(&(iphdr->dest), inp)) {
screamer 0:7a64fbb4069d 333 /* try to forward IP packet on (other) interfaces */
screamer 0:7a64fbb4069d 334 ip_forward(p, iphdr, inp);
screamer 0:7a64fbb4069d 335 } else
screamer 0:7a64fbb4069d 336 #endif /* IP_FORWARD */
screamer 0:7a64fbb4069d 337 {
screamer 0:7a64fbb4069d 338 snmp_inc_ipinaddrerrors();
screamer 0:7a64fbb4069d 339 snmp_inc_ipindiscards();
screamer 0:7a64fbb4069d 340 }
screamer 0:7a64fbb4069d 341 pbuf_free(p);
screamer 0:7a64fbb4069d 342 return ERR_OK;
screamer 0:7a64fbb4069d 343 }
screamer 0:7a64fbb4069d 344 /* packet consists of multiple fragments? */
screamer 0:7a64fbb4069d 345 if ((IPH_OFFSET(iphdr) & htons(IP_OFFMASK | IP_MF)) != 0) {
screamer 0:7a64fbb4069d 346 #if IP_REASSEMBLY /* packet fragment reassembly code present? */
screamer 0:7a64fbb4069d 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",
screamer 0:7a64fbb4069d 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));
screamer 0:7a64fbb4069d 349 /* reassemble the packet*/
screamer 0:7a64fbb4069d 350 p = ip_reass(p);
screamer 0:7a64fbb4069d 351 /* packet not fully reassembled yet? */
screamer 0:7a64fbb4069d 352 if (p == NULL) {
screamer 0:7a64fbb4069d 353 return ERR_OK;
screamer 0:7a64fbb4069d 354 }
screamer 0:7a64fbb4069d 355 iphdr = (struct ip_hdr *)(p->payload); // static_cast<struct ip_hdr *>(x)
screamer 0:7a64fbb4069d 356 #else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
screamer 0:7a64fbb4069d 357 pbuf_free(p);
screamer 0:7a64fbb4069d 358 LWIP_DEBUGF(IP_DEBUG | 2, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
screamer 0:7a64fbb4069d 359 ntohs(IPH_OFFSET(iphdr))));
screamer 0:7a64fbb4069d 360 IP_STATS_INC(ip.opterr);
screamer 0:7a64fbb4069d 361 IP_STATS_INC(ip.drop);
screamer 0:7a64fbb4069d 362 /* unsupported protocol feature */
screamer 0:7a64fbb4069d 363 snmp_inc_ipinunknownprotos();
screamer 0:7a64fbb4069d 364 return ERR_OK;
screamer 0:7a64fbb4069d 365 #endif /* IP_REASSEMBLY */
screamer 0:7a64fbb4069d 366 }
screamer 0:7a64fbb4069d 367
screamer 0:7a64fbb4069d 368 #if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
screamer 0:7a64fbb4069d 369
screamer 0:7a64fbb4069d 370 #if LWIP_IGMP
screamer 0:7a64fbb4069d 371 /* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
screamer 0:7a64fbb4069d 372 if((iphdr_hlen > IP_HLEN && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
screamer 0:7a64fbb4069d 373 #else
screamer 0:7a64fbb4069d 374 if (iphdr_hlen > IP_HLEN) {
screamer 0:7a64fbb4069d 375 #endif /* LWIP_IGMP */
screamer 0:7a64fbb4069d 376 LWIP_DEBUGF(IP_DEBUG | 2, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
screamer 0:7a64fbb4069d 377 pbuf_free(p);
screamer 0:7a64fbb4069d 378 IP_STATS_INC(ip.opterr);
screamer 0:7a64fbb4069d 379 IP_STATS_INC(ip.drop);
screamer 0:7a64fbb4069d 380 /* unsupported protocol feature */
screamer 0:7a64fbb4069d 381 snmp_inc_ipinunknownprotos();
screamer 0:7a64fbb4069d 382 return ERR_OK;
screamer 0:7a64fbb4069d 383 }
screamer 0:7a64fbb4069d 384 #endif /* IP_OPTIONS_ALLOWED == 0 */
screamer 0:7a64fbb4069d 385
screamer 0:7a64fbb4069d 386 /* send to upper layers */
screamer 0:7a64fbb4069d 387 LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
screamer 0:7a64fbb4069d 388 ip_debug_print(p);
screamer 0:7a64fbb4069d 389 LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
screamer 0:7a64fbb4069d 390
screamer 0:7a64fbb4069d 391 #if LWIP_RAW
screamer 0:7a64fbb4069d 392 /* raw input did not eat the packet? */
screamer 0:7a64fbb4069d 393 if (raw_input(p, inp) == 0)
screamer 0:7a64fbb4069d 394 #endif /* LWIP_RAW */
screamer 0:7a64fbb4069d 395 {
screamer 0:7a64fbb4069d 396
screamer 0:7a64fbb4069d 397 switch (IPH_PROTO(iphdr)) {
screamer 0:7a64fbb4069d 398 #if LWIP_UDP
screamer 0:7a64fbb4069d 399 case IP_PROTO_UDP:
screamer 0:7a64fbb4069d 400 #if LWIP_UDPLITE
screamer 0:7a64fbb4069d 401 case IP_PROTO_UDPLITE:
screamer 0:7a64fbb4069d 402 #endif /* LWIP_UDPLITE */
screamer 0:7a64fbb4069d 403 snmp_inc_ipindelivers();
screamer 0:7a64fbb4069d 404 udp_input(p, inp);
screamer 0:7a64fbb4069d 405 break;
screamer 0:7a64fbb4069d 406 #endif /* LWIP_UDP */
screamer 0:7a64fbb4069d 407 #if LWIP_TCP
screamer 0:7a64fbb4069d 408 case IP_PROTO_TCP:
screamer 0:7a64fbb4069d 409 snmp_inc_ipindelivers();
screamer 0:7a64fbb4069d 410 tcp_input(p, inp);
screamer 0:7a64fbb4069d 411 break;
screamer 0:7a64fbb4069d 412 #endif /* LWIP_TCP */
screamer 0:7a64fbb4069d 413 #if LWIP_ICMP
screamer 0:7a64fbb4069d 414 case IP_PROTO_ICMP:
screamer 0:7a64fbb4069d 415 snmp_inc_ipindelivers();
screamer 0:7a64fbb4069d 416 icmp_input(p, inp);
screamer 0:7a64fbb4069d 417 break;
screamer 0:7a64fbb4069d 418 #endif /* LWIP_ICMP */
screamer 0:7a64fbb4069d 419 #if LWIP_IGMP
screamer 0:7a64fbb4069d 420 case IP_PROTO_IGMP:
screamer 0:7a64fbb4069d 421 igmp_input(p,inp,&(iphdr->dest));
screamer 0:7a64fbb4069d 422 break;
screamer 0:7a64fbb4069d 423 #endif /* LWIP_IGMP */
screamer 0:7a64fbb4069d 424 default:
screamer 0:7a64fbb4069d 425 #if LWIP_ICMP
screamer 0:7a64fbb4069d 426 /* send ICMP destination protocol unreachable unless is was a broadcast */
screamer 0:7a64fbb4069d 427 if (!ip_addr_isbroadcast(&(iphdr->dest), inp) &&
screamer 0:7a64fbb4069d 428 !ip_addr_ismulticast(&(iphdr->dest))) {
screamer 0:7a64fbb4069d 429 p->payload = iphdr;
screamer 0:7a64fbb4069d 430 icmp_dest_unreach(p, ICMP_DUR_PROTO);
screamer 0:7a64fbb4069d 431 }
screamer 0:7a64fbb4069d 432 #endif /* LWIP_ICMP */
screamer 0:7a64fbb4069d 433 pbuf_free(p);
screamer 0:7a64fbb4069d 434
screamer 0:7a64fbb4069d 435 LWIP_DEBUGF(IP_DEBUG | 2, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
screamer 0:7a64fbb4069d 436
screamer 0:7a64fbb4069d 437 IP_STATS_INC(ip.proterr);
screamer 0:7a64fbb4069d 438 IP_STATS_INC(ip.drop);
screamer 0:7a64fbb4069d 439 snmp_inc_ipinunknownprotos();
screamer 0:7a64fbb4069d 440 }
screamer 0:7a64fbb4069d 441 }
screamer 0:7a64fbb4069d 442
screamer 0:7a64fbb4069d 443 return ERR_OK;
screamer 0:7a64fbb4069d 444 }
screamer 0:7a64fbb4069d 445
screamer 0:7a64fbb4069d 446 /**
screamer 0:7a64fbb4069d 447 * Sends an IP packet on a network interface. This function constructs
screamer 0:7a64fbb4069d 448 * the IP header and calculates the IP header checksum. If the source
screamer 0:7a64fbb4069d 449 * IP address is NULL, the IP address of the outgoing network
screamer 0:7a64fbb4069d 450 * interface is filled in as source address.
screamer 0:7a64fbb4069d 451 * If the destination IP address is IP_HDRINCL, p is assumed to already
screamer 0:7a64fbb4069d 452 * include an IP header and p->payload points to it instead of the data.
screamer 0:7a64fbb4069d 453 *
screamer 0:7a64fbb4069d 454 * @param p the packet to send (p->payload points to the data, e.g. next
screamer 0:7a64fbb4069d 455 protocol header; if dest == IP_HDRINCL, p already includes an IP
screamer 0:7a64fbb4069d 456 header and p->payload points to that IP header)
screamer 0:7a64fbb4069d 457 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
screamer 0:7a64fbb4069d 458 * IP address of the netif used to send is used as source address)
screamer 0:7a64fbb4069d 459 * @param dest the destination IP address to send the packet to
screamer 0:7a64fbb4069d 460 * @param ttl the TTL value to be set in the IP header
screamer 0:7a64fbb4069d 461 * @param tos the TOS value to be set in the IP header
screamer 0:7a64fbb4069d 462 * @param proto the PROTOCOL to be set in the IP header
screamer 0:7a64fbb4069d 463 * @param netif the netif on which to send this packet
screamer 0:7a64fbb4069d 464 * @return ERR_OK if the packet was sent OK
screamer 0:7a64fbb4069d 465 * ERR_BUF if p doesn't have enough space for IP/LINK headers
screamer 0:7a64fbb4069d 466 * returns errors returned by netif->output
screamer 0:7a64fbb4069d 467 *
screamer 0:7a64fbb4069d 468 * @note ip_id: RFC791 "some host may be able to simply use
screamer 0:7a64fbb4069d 469 * unique identifiers independent of destination"
screamer 0:7a64fbb4069d 470 */
screamer 0:7a64fbb4069d 471 err_t
screamer 0:7a64fbb4069d 472 ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
screamer 0:7a64fbb4069d 473 u8_t ttl, u8_t tos,
screamer 0:7a64fbb4069d 474 u8_t proto, struct netif *netif)
screamer 0:7a64fbb4069d 475 {
screamer 0:7a64fbb4069d 476 struct ip_hdr *iphdr;
screamer 0:7a64fbb4069d 477 static u16_t ip_id = 0;
screamer 0:7a64fbb4069d 478
screamer 0:7a64fbb4069d 479 snmp_inc_ipoutrequests();
screamer 0:7a64fbb4069d 480
screamer 0:7a64fbb4069d 481 /* Should the IP header be generated or is it already included in p? */
screamer 0:7a64fbb4069d 482 if (dest != IP_HDRINCL) {
screamer 0:7a64fbb4069d 483 /* generate IP header */
screamer 0:7a64fbb4069d 484 if (pbuf_header(p, IP_HLEN)) {
screamer 0:7a64fbb4069d 485 LWIP_DEBUGF(IP_DEBUG | 2, ("ip_output: not enough room for IP header in pbuf\n"));
screamer 0:7a64fbb4069d 486
screamer 0:7a64fbb4069d 487 IP_STATS_INC(ip.err);
screamer 0:7a64fbb4069d 488 snmp_inc_ipoutdiscards();
screamer 0:7a64fbb4069d 489 return ERR_BUF;
screamer 0:7a64fbb4069d 490 }
screamer 0:7a64fbb4069d 491
screamer 0:7a64fbb4069d 492 iphdr = (struct ip_hdr *)(p->payload); // static_cast<struct ip_hdr *>(x)
screamer 0:7a64fbb4069d 493 LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
screamer 0:7a64fbb4069d 494 (p->len >= sizeof(struct ip_hdr)));
screamer 0:7a64fbb4069d 495
screamer 0:7a64fbb4069d 496 IPH_TTL_SET(iphdr, ttl);
screamer 0:7a64fbb4069d 497 IPH_PROTO_SET(iphdr, proto);
screamer 0:7a64fbb4069d 498
screamer 0:7a64fbb4069d 499 ip_addr_set(&(iphdr->dest), dest);
screamer 0:7a64fbb4069d 500
screamer 0:7a64fbb4069d 501 IPH_VHLTOS_SET(iphdr, 4, IP_HLEN / 4, tos);
screamer 0:7a64fbb4069d 502 IPH_LEN_SET(iphdr, htons(p->tot_len));
screamer 0:7a64fbb4069d 503 IPH_OFFSET_SET(iphdr, 0);
screamer 0:7a64fbb4069d 504 IPH_ID_SET(iphdr, htons(ip_id));
screamer 0:7a64fbb4069d 505 ++ip_id;
screamer 0:7a64fbb4069d 506
screamer 0:7a64fbb4069d 507 if (ip_addr_isany(src)) {
screamer 0:7a64fbb4069d 508 ip_addr_set(&(iphdr->src), &(netif->ip_addr));
screamer 0:7a64fbb4069d 509 } else {
screamer 0:7a64fbb4069d 510 ip_addr_set(&(iphdr->src), src);
screamer 0:7a64fbb4069d 511 }
screamer 0:7a64fbb4069d 512
screamer 0:7a64fbb4069d 513 IPH_CHKSUM_SET(iphdr, 0);
screamer 0:7a64fbb4069d 514 #if CHECKSUM_GEN_IP
screamer 0:7a64fbb4069d 515 IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
screamer 0:7a64fbb4069d 516 #endif
screamer 0:7a64fbb4069d 517 } else {
screamer 0:7a64fbb4069d 518 /* IP header already included in p */
screamer 0:7a64fbb4069d 519 iphdr = (struct ip_hdr *)(p->payload); // static_cast<struct ip_hdr *>(x)
screamer 0:7a64fbb4069d 520 struct ip_addr dest_addr;
screamer 0:7a64fbb4069d 521 dest_addr.addr = iphdr->dest.addr;
screamer 0:7a64fbb4069d 522 dest = &dest_addr;
screamer 0:7a64fbb4069d 523 }
screamer 0:7a64fbb4069d 524
screamer 0:7a64fbb4069d 525 #if IP_FRAG
screamer 0:7a64fbb4069d 526 /* don't fragment if interface has mtu set to 0 [loopif] */
screamer 0:7a64fbb4069d 527 if (netif->mtu && (p->tot_len > netif->mtu))
screamer 0:7a64fbb4069d 528 return ip_frag(p,netif,dest);
screamer 0:7a64fbb4069d 529 #endif
screamer 0:7a64fbb4069d 530
screamer 0:7a64fbb4069d 531 IP_STATS_INC(ip.xmit);
screamer 0:7a64fbb4069d 532
screamer 0:7a64fbb4069d 533 LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
screamer 0:7a64fbb4069d 534 ip_debug_print(p);
screamer 0:7a64fbb4069d 535
screamer 0:7a64fbb4069d 536 #if (LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF)
screamer 0:7a64fbb4069d 537 if (ip_addr_cmp(dest, &netif->ip_addr)) {
screamer 0:7a64fbb4069d 538 /* Packet to self, enqueue it for loopback */
screamer 0:7a64fbb4069d 539 LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
screamer 0:7a64fbb4069d 540
screamer 0:7a64fbb4069d 541 return netif_loop_output(netif, p, dest);
screamer 0:7a64fbb4069d 542 } else
screamer 0:7a64fbb4069d 543 #endif /* (LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF) */
screamer 0:7a64fbb4069d 544 {
screamer 0:7a64fbb4069d 545 LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
screamer 0:7a64fbb4069d 546
screamer 0:7a64fbb4069d 547 return netif->output(netif, p, dest);
screamer 0:7a64fbb4069d 548 }
screamer 0:7a64fbb4069d 549 }
screamer 0:7a64fbb4069d 550
screamer 0:7a64fbb4069d 551 /**
screamer 0:7a64fbb4069d 552 * Simple interface to ip_output_if. It finds the outgoing network
screamer 0:7a64fbb4069d 553 * interface and calls upon ip_output_if to do the actual work.
screamer 0:7a64fbb4069d 554 *
screamer 0:7a64fbb4069d 555 * @param p the packet to send (p->payload points to the data, e.g. next
screamer 0:7a64fbb4069d 556 protocol header; if dest == IP_HDRINCL, p already includes an IP
screamer 0:7a64fbb4069d 557 header and p->payload points to that IP header)
screamer 0:7a64fbb4069d 558 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
screamer 0:7a64fbb4069d 559 * IP address of the netif used to send is used as source address)
screamer 0:7a64fbb4069d 560 * @param dest the destination IP address to send the packet to
screamer 0:7a64fbb4069d 561 * @param ttl the TTL value to be set in the IP header
screamer 0:7a64fbb4069d 562 * @param tos the TOS value to be set in the IP header
screamer 0:7a64fbb4069d 563 * @param proto the PROTOCOL to be set in the IP header
screamer 0:7a64fbb4069d 564 *
screamer 0:7a64fbb4069d 565 * @return ERR_RTE if no route is found
screamer 0:7a64fbb4069d 566 * see ip_output_if() for more return values
screamer 0:7a64fbb4069d 567 */
screamer 0:7a64fbb4069d 568 err_t
screamer 0:7a64fbb4069d 569 ip_output(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
screamer 0:7a64fbb4069d 570 u8_t ttl, u8_t tos, u8_t proto)
screamer 0:7a64fbb4069d 571 {
screamer 0:7a64fbb4069d 572 struct netif *netif;
screamer 0:7a64fbb4069d 573
screamer 0:7a64fbb4069d 574 if ((netif = ip_route(dest)) == NULL) {
screamer 0:7a64fbb4069d 575 LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
screamer 0:7a64fbb4069d 576 IP_STATS_INC(ip.rterr);
screamer 0:7a64fbb4069d 577 return ERR_RTE;
screamer 0:7a64fbb4069d 578 }
screamer 0:7a64fbb4069d 579
screamer 0:7a64fbb4069d 580 return ip_output_if(p, src, dest, ttl, tos, proto, netif);
screamer 0:7a64fbb4069d 581 }
screamer 0:7a64fbb4069d 582
screamer 0:7a64fbb4069d 583 #if LWIP_NETIF_HWADDRHINT
screamer 0:7a64fbb4069d 584 /** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
screamer 0:7a64fbb4069d 585 * before calling ip_output_if.
screamer 0:7a64fbb4069d 586 *
screamer 0:7a64fbb4069d 587 * @param p the packet to send (p->payload points to the data, e.g. next
screamer 0:7a64fbb4069d 588 protocol header; if dest == IP_HDRINCL, p already includes an IP
screamer 0:7a64fbb4069d 589 header and p->payload points to that IP header)
screamer 0:7a64fbb4069d 590 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
screamer 0:7a64fbb4069d 591 * IP address of the netif used to send is used as source address)
screamer 0:7a64fbb4069d 592 * @param dest the destination IP address to send the packet to
screamer 0:7a64fbb4069d 593 * @param ttl the TTL value to be set in the IP header
screamer 0:7a64fbb4069d 594 * @param tos the TOS value to be set in the IP header
screamer 0:7a64fbb4069d 595 * @param proto the PROTOCOL to be set in the IP header
screamer 0:7a64fbb4069d 596 * @param addr_hint address hint pointer set to netif->addr_hint before
screamer 0:7a64fbb4069d 597 * calling ip_output_if()
screamer 0:7a64fbb4069d 598 *
screamer 0:7a64fbb4069d 599 * @return ERR_RTE if no route is found
screamer 0:7a64fbb4069d 600 * see ip_output_if() for more return values
screamer 0:7a64fbb4069d 601 */
screamer 0:7a64fbb4069d 602 err_t
screamer 0:7a64fbb4069d 603 ip_output_hinted(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
screamer 0:7a64fbb4069d 604 u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
screamer 0:7a64fbb4069d 605 {
screamer 0:7a64fbb4069d 606 struct netif *netif;
screamer 0:7a64fbb4069d 607 err_t err;
screamer 0:7a64fbb4069d 608
screamer 0:7a64fbb4069d 609 if ((netif = ip_route(dest)) == NULL) {
screamer 0:7a64fbb4069d 610 LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
screamer 0:7a64fbb4069d 611 IP_STATS_INC(ip.rterr);
screamer 0:7a64fbb4069d 612 return ERR_RTE;
screamer 0:7a64fbb4069d 613 }
screamer 0:7a64fbb4069d 614
screamer 0:7a64fbb4069d 615 netif->addr_hint = addr_hint;
screamer 0:7a64fbb4069d 616 err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
screamer 0:7a64fbb4069d 617 netif->addr_hint = NULL;
screamer 0:7a64fbb4069d 618
screamer 0:7a64fbb4069d 619 return err;
screamer 0:7a64fbb4069d 620 }
screamer 0:7a64fbb4069d 621 #endif /* LWIP_NETIF_HWADDRHINT*/
screamer 0:7a64fbb4069d 622
screamer 0:7a64fbb4069d 623 #if IP_DEBUG
screamer 0:7a64fbb4069d 624 /* Print an IP header by using LWIP_DEBUGF
screamer 0:7a64fbb4069d 625 * @param p an IP packet, p->payload pointing to the IP header
screamer 0:7a64fbb4069d 626 */
screamer 0:7a64fbb4069d 627 void
screamer 0:7a64fbb4069d 628 ip_debug_print(struct pbuf *p)
screamer 0:7a64fbb4069d 629 {
screamer 0:7a64fbb4069d 630 struct ip_hdr *iphdr = (struct ip_hdr *)p->payload; // static_cast<struct ip_hdr *>(x)
screamer 0:7a64fbb4069d 631 u8_t *payload;
screamer 0:7a64fbb4069d 632
screamer 0:7a64fbb4069d 633 payload = (u8_t *)iphdr + IP_HLEN;
screamer 0:7a64fbb4069d 634
screamer 0:7a64fbb4069d 635 LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
screamer 0:7a64fbb4069d 636 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
screamer 0:7a64fbb4069d 637 LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n",
screamer 0:7a64fbb4069d 638 IPH_V(iphdr),
screamer 0:7a64fbb4069d 639 IPH_HL(iphdr),
screamer 0:7a64fbb4069d 640 IPH_TOS(iphdr),
screamer 0:7a64fbb4069d 641 ntohs(IPH_LEN(iphdr))));
screamer 0:7a64fbb4069d 642 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
screamer 0:7a64fbb4069d 643 LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n",
screamer 0:7a64fbb4069d 644 ntohs(IPH_ID(iphdr)),
screamer 0:7a64fbb4069d 645 ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
screamer 0:7a64fbb4069d 646 ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
screamer 0:7a64fbb4069d 647 ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
screamer 0:7a64fbb4069d 648 ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
screamer 0:7a64fbb4069d 649 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
screamer 0:7a64fbb4069d 650 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n",
screamer 0:7a64fbb4069d 651 IPH_TTL(iphdr),
screamer 0:7a64fbb4069d 652 IPH_PROTO(iphdr),
screamer 0:7a64fbb4069d 653 ntohs(IPH_CHKSUM(iphdr))));
screamer 0:7a64fbb4069d 654 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
screamer 0:7a64fbb4069d 655 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n",
screamer 0:7a64fbb4069d 656 ip4_addr1(&iphdr->src),
screamer 0:7a64fbb4069d 657 ip4_addr2(&iphdr->src),
screamer 0:7a64fbb4069d 658 ip4_addr3(&iphdr->src),
screamer 0:7a64fbb4069d 659 ip4_addr4(&iphdr->src)));
screamer 0:7a64fbb4069d 660 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
screamer 0:7a64fbb4069d 661 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n",
screamer 0:7a64fbb4069d 662 ip4_addr1(&iphdr->dest),
screamer 0:7a64fbb4069d 663 ip4_addr2(&iphdr->dest),
screamer 0:7a64fbb4069d 664 ip4_addr3(&iphdr->dest),
screamer 0:7a64fbb4069d 665 ip4_addr4(&iphdr->dest)));
screamer 0:7a64fbb4069d 666 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
screamer 0:7a64fbb4069d 667 }
screamer 0:7a64fbb4069d 668 #endif /* IP_DEBUG */