Nino Der Kinderen / Mbed 2 deprecated InetTest

Embedded C project:18/12/2014

Dependencies:   DS1307 TextLCD mbed

NetServices/lwip/core/ipv4/ip.c@0:8d87bc453349, 2014-12-18 (annotated)

Committer:
ninoderkinderen
Date:
Thu Dec 18 09:35:49 2014 +0000
Revision:
0:8d87bc453349
Programma embedded C

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ninoderkinderen 0:8d87bc453349 1 /**
ninoderkinderen 0:8d87bc453349 2 * @file
ninoderkinderen 0:8d87bc453349 3 * This is the IPv4 layer implementation for incoming and outgoing IP traffic.
ninoderkinderen 0:8d87bc453349 4 *
ninoderkinderen 0:8d87bc453349 5 * @see ip_frag.c
ninoderkinderen 0:8d87bc453349 6 *
ninoderkinderen 0:8d87bc453349 7 */
ninoderkinderen 0:8d87bc453349 8
ninoderkinderen 0:8d87bc453349 9 /*
ninoderkinderen 0:8d87bc453349 10 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
ninoderkinderen 0:8d87bc453349 11 * All rights reserved.
ninoderkinderen 0:8d87bc453349 12 *
ninoderkinderen 0:8d87bc453349 13 * Redistribution and use in source and binary forms, with or without modification,
ninoderkinderen 0:8d87bc453349 14 * are permitted provided that the following conditions are met:
ninoderkinderen 0:8d87bc453349 15 *
ninoderkinderen 0:8d87bc453349 16 * 1. Redistributions of source code must retain the above copyright notice,
ninoderkinderen 0:8d87bc453349 17 * this list of conditions and the following disclaimer.
ninoderkinderen 0:8d87bc453349 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
ninoderkinderen 0:8d87bc453349 19 * this list of conditions and the following disclaimer in the documentation
ninoderkinderen 0:8d87bc453349 20 * and/or other materials provided with the distribution.
ninoderkinderen 0:8d87bc453349 21 * 3. The name of the author may not be used to endorse or promote products
ninoderkinderen 0:8d87bc453349 22 * derived from this software without specific prior written permission.
ninoderkinderen 0:8d87bc453349 23 *
ninoderkinderen 0:8d87bc453349 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
ninoderkinderen 0:8d87bc453349 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
ninoderkinderen 0:8d87bc453349 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
ninoderkinderen 0:8d87bc453349 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
ninoderkinderen 0:8d87bc453349 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
ninoderkinderen 0:8d87bc453349 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
ninoderkinderen 0:8d87bc453349 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
ninoderkinderen 0:8d87bc453349 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
ninoderkinderen 0:8d87bc453349 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
ninoderkinderen 0:8d87bc453349 33 * OF SUCH DAMAGE.
ninoderkinderen 0:8d87bc453349 34 *
ninoderkinderen 0:8d87bc453349 35 * This file is part of the lwIP TCP/IP stack.
ninoderkinderen 0:8d87bc453349 36 *
ninoderkinderen 0:8d87bc453349 37 * Author: Adam Dunkels <adam@sics.se>
ninoderkinderen 0:8d87bc453349 38 *
ninoderkinderen 0:8d87bc453349 39 */
ninoderkinderen 0:8d87bc453349 40
ninoderkinderen 0:8d87bc453349 41 #include "lwip/opt.h"
ninoderkinderen 0:8d87bc453349 42 #include "lwip/ip.h"
ninoderkinderen 0:8d87bc453349 43 #include "lwip/def.h"
ninoderkinderen 0:8d87bc453349 44 #include "lwip/mem.h"
ninoderkinderen 0:8d87bc453349 45 #include "lwip/ip_frag.h"
ninoderkinderen 0:8d87bc453349 46 #include "lwip/inet_chksum.h"
ninoderkinderen 0:8d87bc453349 47 #include "lwip/netif.h"
ninoderkinderen 0:8d87bc453349 48 #include "lwip/icmp.h"
ninoderkinderen 0:8d87bc453349 49 #include "lwip/igmp.h"
ninoderkinderen 0:8d87bc453349 50 #include "lwip/raw.h"
ninoderkinderen 0:8d87bc453349 51 #include "lwip/udp.h"
ninoderkinderen 0:8d87bc453349 52 #include "lwip/tcp_impl.h"
ninoderkinderen 0:8d87bc453349 53 #include "lwip/snmp.h"
ninoderkinderen 0:8d87bc453349 54 #include "lwip/dhcp.h"
ninoderkinderen 0:8d87bc453349 55 #include "lwip/autoip.h"
ninoderkinderen 0:8d87bc453349 56 #include "lwip/stats.h"
ninoderkinderen 0:8d87bc453349 57 #include "arch/perf.h"
ninoderkinderen 0:8d87bc453349 58
ninoderkinderen 0:8d87bc453349 59 #include <string.h>
ninoderkinderen 0:8d87bc453349 60
ninoderkinderen 0:8d87bc453349 61 /** Set this to 0 in the rare case of wanting to call an extra function to
ninoderkinderen 0:8d87bc453349 62 * generate the IP checksum (in contrast to calculating it on-the-fly). */
ninoderkinderen 0:8d87bc453349 63 #ifndef LWIP_INLINE_IP_CHKSUM
ninoderkinderen 0:8d87bc453349 64 #define LWIP_INLINE_IP_CHKSUM 1
ninoderkinderen 0:8d87bc453349 65 #endif
ninoderkinderen 0:8d87bc453349 66 #if LWIP_INLINE_IP_CHKSUM && CHECKSUM_GEN_IP
ninoderkinderen 0:8d87bc453349 67 #define CHECKSUM_GEN_IP_INLINE 1
ninoderkinderen 0:8d87bc453349 68 #else
ninoderkinderen 0:8d87bc453349 69 #define CHECKSUM_GEN_IP_INLINE 0
ninoderkinderen 0:8d87bc453349 70 #endif
ninoderkinderen 0:8d87bc453349 71
ninoderkinderen 0:8d87bc453349 72 #if LWIP_DHCP || defined(LWIP_IP_ACCEPT_UDP_PORT)
ninoderkinderen 0:8d87bc453349 73 #define IP_ACCEPT_LINK_LAYER_ADDRESSING 1
ninoderkinderen 0:8d87bc453349 74
ninoderkinderen 0:8d87bc453349 75 /** Some defines for DHCP to let link-layer-addressed packets through while the
ninoderkinderen 0:8d87bc453349 76 * netif is down.
ninoderkinderen 0:8d87bc453349 77 * To use this in your own application/protocol, define LWIP_IP_ACCEPT_UDP_PORT
ninoderkinderen 0:8d87bc453349 78 * to return 1 if the port is accepted and 0 if the port is not accepted.
ninoderkinderen 0:8d87bc453349 79 */
ninoderkinderen 0:8d87bc453349 80 #if LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT)
ninoderkinderen 0:8d87bc453349 81 /* accept DHCP client port and custom port */
ninoderkinderen 0:8d87bc453349 82 #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (((port) == PP_NTOHS(DHCP_CLIENT_PORT)) \
ninoderkinderen 0:8d87bc453349 83 || (LWIP_IP_ACCEPT_UDP_PORT(port)))
ninoderkinderen 0:8d87bc453349 84 #elif defined(LWIP_IP_ACCEPT_UDP_PORT) /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
ninoderkinderen 0:8d87bc453349 85 /* accept custom port only */
ninoderkinderen 0:8d87bc453349 86 #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (LWIP_IP_ACCEPT_UDP_PORT(dst_port))
ninoderkinderen 0:8d87bc453349 87 #else /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
ninoderkinderen 0:8d87bc453349 88 /* accept DHCP client port only */
ninoderkinderen 0:8d87bc453349 89 #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) ((port) == PP_NTOHS(DHCP_CLIENT_PORT))
ninoderkinderen 0:8d87bc453349 90 #endif /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
ninoderkinderen 0:8d87bc453349 91
ninoderkinderen 0:8d87bc453349 92 #else /* LWIP_DHCP */
ninoderkinderen 0:8d87bc453349 93 #define IP_ACCEPT_LINK_LAYER_ADDRESSING 0
ninoderkinderen 0:8d87bc453349 94 #endif /* LWIP_DHCP */
ninoderkinderen 0:8d87bc453349 95
ninoderkinderen 0:8d87bc453349 96 /**
ninoderkinderen 0:8d87bc453349 97 * The interface that provided the packet for the current callback
ninoderkinderen 0:8d87bc453349 98 * invocation.
ninoderkinderen 0:8d87bc453349 99 */
ninoderkinderen 0:8d87bc453349 100 struct netif *current_netif;
ninoderkinderen 0:8d87bc453349 101
ninoderkinderen 0:8d87bc453349 102 /**
ninoderkinderen 0:8d87bc453349 103 * Header of the input packet currently being processed.
ninoderkinderen 0:8d87bc453349 104 */
ninoderkinderen 0:8d87bc453349 105 const struct ip_hdr *current_header;
ninoderkinderen 0:8d87bc453349 106 /** Source IP address of current_header */
ninoderkinderen 0:8d87bc453349 107 ip_addr_t current_iphdr_src;
ninoderkinderen 0:8d87bc453349 108 /** Destination IP address of current_header */
ninoderkinderen 0:8d87bc453349 109 ip_addr_t current_iphdr_dest;
ninoderkinderen 0:8d87bc453349 110
ninoderkinderen 0:8d87bc453349 111 /** The IP header ID of the next outgoing IP packet */
ninoderkinderen 0:8d87bc453349 112 static u16_t ip_id;
ninoderkinderen 0:8d87bc453349 113
ninoderkinderen 0:8d87bc453349 114 /**
ninoderkinderen 0:8d87bc453349 115 * Finds the appropriate network interface for a given IP address. It
ninoderkinderen 0:8d87bc453349 116 * searches the list of network interfaces linearly. A match is found
ninoderkinderen 0:8d87bc453349 117 * if the masked IP address of the network interface equals the masked
ninoderkinderen 0:8d87bc453349 118 * IP address given to the function.
ninoderkinderen 0:8d87bc453349 119 *
ninoderkinderen 0:8d87bc453349 120 * @param dest the destination IP address for which to find the route
ninoderkinderen 0:8d87bc453349 121 * @return the netif on which to send to reach dest
ninoderkinderen 0:8d87bc453349 122 */
ninoderkinderen 0:8d87bc453349 123 struct netif *
ninoderkinderen 0:8d87bc453349 124 ip_route(ip_addr_t *dest)
ninoderkinderen 0:8d87bc453349 125 {
ninoderkinderen 0:8d87bc453349 126 struct netif *netif;
ninoderkinderen 0:8d87bc453349 127
ninoderkinderen 0:8d87bc453349 128 /* iterate through netifs */
ninoderkinderen 0:8d87bc453349 129 for(netif = netif_list; netif != NULL; netif = netif->next) {
ninoderkinderen 0:8d87bc453349 130 /* network mask matches? */
ninoderkinderen 0:8d87bc453349 131 if (netif_is_up(netif)) {
ninoderkinderen 0:8d87bc453349 132 if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
ninoderkinderen 0:8d87bc453349 133 /* return netif on which to forward IP packet */
ninoderkinderen 0:8d87bc453349 134 return netif;
ninoderkinderen 0:8d87bc453349 135 }
ninoderkinderen 0:8d87bc453349 136 }
ninoderkinderen 0:8d87bc453349 137 }
ninoderkinderen 0:8d87bc453349 138 if ((netif_default == NULL) || (!netif_is_up(netif_default))) {
ninoderkinderen 0:8d87bc453349 139 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_route: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
ninoderkinderen 0:8d87bc453349 140 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
ninoderkinderen 0:8d87bc453349 141 IP_STATS_INC(ip.rterr);
ninoderkinderen 0:8d87bc453349 142 snmp_inc_ipoutnoroutes();
ninoderkinderen 0:8d87bc453349 143 return NULL;
ninoderkinderen 0:8d87bc453349 144 }
ninoderkinderen 0:8d87bc453349 145 /* no matching netif found, use default netif */
ninoderkinderen 0:8d87bc453349 146 return netif_default;
ninoderkinderen 0:8d87bc453349 147 }
ninoderkinderen 0:8d87bc453349 148
ninoderkinderen 0:8d87bc453349 149 #if IP_FORWARD
ninoderkinderen 0:8d87bc453349 150 /**
ninoderkinderen 0:8d87bc453349 151 * Forwards an IP packet. It finds an appropriate route for the
ninoderkinderen 0:8d87bc453349 152 * packet, decrements the TTL value of the packet, adjusts the
ninoderkinderen 0:8d87bc453349 153 * checksum and outputs the packet on the appropriate interface.
ninoderkinderen 0:8d87bc453349 154 *
ninoderkinderen 0:8d87bc453349 155 * @param p the packet to forward (p->payload points to IP header)
ninoderkinderen 0:8d87bc453349 156 * @param iphdr the IP header of the input packet
ninoderkinderen 0:8d87bc453349 157 * @param inp the netif on which this packet was received
ninoderkinderen 0:8d87bc453349 158 */
ninoderkinderen 0:8d87bc453349 159 static void
ninoderkinderen 0:8d87bc453349 160 ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
ninoderkinderen 0:8d87bc453349 161 {
ninoderkinderen 0:8d87bc453349 162 struct netif *netif;
ninoderkinderen 0:8d87bc453349 163
ninoderkinderen 0:8d87bc453349 164 PERF_START;
ninoderkinderen 0:8d87bc453349 165
ninoderkinderen 0:8d87bc453349 166 /* RFC3927 2.7: do not forward link-local addresses */
ninoderkinderen 0:8d87bc453349 167 if (ip_addr_islinklocal(&current_iphdr_dest)) {
ninoderkinderen 0:8d87bc453349 168 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not forwarding LLA %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
ninoderkinderen 0:8d87bc453349 169 ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
ninoderkinderen 0:8d87bc453349 170 ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
ninoderkinderen 0:8d87bc453349 171 goto return_noroute;
ninoderkinderen 0:8d87bc453349 172 }
ninoderkinderen 0:8d87bc453349 173
ninoderkinderen 0:8d87bc453349 174 /* Find network interface where to forward this IP packet to. */
ninoderkinderen 0:8d87bc453349 175 netif = ip_route(&current_iphdr_dest);
ninoderkinderen 0:8d87bc453349 176 if (netif == NULL) {
ninoderkinderen 0:8d87bc453349 177 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
ninoderkinderen 0:8d87bc453349 178 ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
ninoderkinderen 0:8d87bc453349 179 ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
ninoderkinderen 0:8d87bc453349 180 goto return_noroute;
ninoderkinderen 0:8d87bc453349 181 }
ninoderkinderen 0:8d87bc453349 182 /* Do not forward packets onto the same network interface on which
ninoderkinderen 0:8d87bc453349 183 * they arrived. */
ninoderkinderen 0:8d87bc453349 184 if (netif == inp) {
ninoderkinderen 0:8d87bc453349 185 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
ninoderkinderen 0:8d87bc453349 186 goto return_noroute;
ninoderkinderen 0:8d87bc453349 187 }
ninoderkinderen 0:8d87bc453349 188
ninoderkinderen 0:8d87bc453349 189 /* decrement TTL */
ninoderkinderen 0:8d87bc453349 190 IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
ninoderkinderen 0:8d87bc453349 191 /* send ICMP if TTL == 0 */
ninoderkinderen 0:8d87bc453349 192 if (IPH_TTL(iphdr) == 0) {
ninoderkinderen 0:8d87bc453349 193 snmp_inc_ipinhdrerrors();
ninoderkinderen 0:8d87bc453349 194 #if LWIP_ICMP
ninoderkinderen 0:8d87bc453349 195 /* Don't send ICMP messages in response to ICMP messages */
ninoderkinderen 0:8d87bc453349 196 if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
ninoderkinderen 0:8d87bc453349 197 icmp_time_exceeded(p, ICMP_TE_TTL);
ninoderkinderen 0:8d87bc453349 198 }
ninoderkinderen 0:8d87bc453349 199 #endif /* LWIP_ICMP */
ninoderkinderen 0:8d87bc453349 200 return;
ninoderkinderen 0:8d87bc453349 201 }
ninoderkinderen 0:8d87bc453349 202
ninoderkinderen 0:8d87bc453349 203 /* Incrementally update the IP checksum. */
ninoderkinderen 0:8d87bc453349 204 if (IPH_CHKSUM(iphdr) >= PP_HTONS(0xffff - 0x100)) {
ninoderkinderen 0:8d87bc453349 205 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100) + 1);
ninoderkinderen 0:8d87bc453349 206 } else {
ninoderkinderen 0:8d87bc453349 207 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100));
ninoderkinderen 0:8d87bc453349 208 }
ninoderkinderen 0:8d87bc453349 209
ninoderkinderen 0:8d87bc453349 210 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
ninoderkinderen 0:8d87bc453349 211 ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
ninoderkinderen 0:8d87bc453349 212 ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
ninoderkinderen 0:8d87bc453349 213
ninoderkinderen 0:8d87bc453349 214 IP_STATS_INC(ip.fw);
ninoderkinderen 0:8d87bc453349 215 IP_STATS_INC(ip.xmit);
ninoderkinderen 0:8d87bc453349 216 snmp_inc_ipforwdatagrams();
ninoderkinderen 0:8d87bc453349 217
ninoderkinderen 0:8d87bc453349 218 PERF_STOP("ip_forward");
ninoderkinderen 0:8d87bc453349 219 /* transmit pbuf on chosen interface */
ninoderkinderen 0:8d87bc453349 220 netif->output(netif, p, &current_iphdr_dest);
ninoderkinderen 0:8d87bc453349 221 return;
ninoderkinderen 0:8d87bc453349 222 return_noroute:
ninoderkinderen 0:8d87bc453349 223 snmp_inc_ipoutnoroutes();
ninoderkinderen 0:8d87bc453349 224 }
ninoderkinderen 0:8d87bc453349 225 #endif /* IP_FORWARD */
ninoderkinderen 0:8d87bc453349 226
ninoderkinderen 0:8d87bc453349 227 /**
ninoderkinderen 0:8d87bc453349 228 * This function is called by the network interface device driver when
ninoderkinderen 0:8d87bc453349 229 * an IP packet is received. The function does the basic checks of the
ninoderkinderen 0:8d87bc453349 230 * IP header such as packet size being at least larger than the header
ninoderkinderen 0:8d87bc453349 231 * size etc. If the packet was not destined for us, the packet is
ninoderkinderen 0:8d87bc453349 232 * forwarded (using ip_forward). The IP checksum is always checked.
ninoderkinderen 0:8d87bc453349 233 *
ninoderkinderen 0:8d87bc453349 234 * Finally, the packet is sent to the upper layer protocol input function.
ninoderkinderen 0:8d87bc453349 235 *
ninoderkinderen 0:8d87bc453349 236 * @param p the received IP packet (p->payload points to IP header)
ninoderkinderen 0:8d87bc453349 237 * @param inp the netif on which this packet was received
ninoderkinderen 0:8d87bc453349 238 * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
ninoderkinderen 0:8d87bc453349 239 * processed, but currently always returns ERR_OK)
ninoderkinderen 0:8d87bc453349 240 */
ninoderkinderen 0:8d87bc453349 241 err_t
ninoderkinderen 0:8d87bc453349 242 ip_input(struct pbuf *p, struct netif *inp)
ninoderkinderen 0:8d87bc453349 243 {
ninoderkinderen 0:8d87bc453349 244 struct ip_hdr *iphdr;
ninoderkinderen 0:8d87bc453349 245 struct netif *netif;
ninoderkinderen 0:8d87bc453349 246 u16_t iphdr_hlen;
ninoderkinderen 0:8d87bc453349 247 u16_t iphdr_len;
ninoderkinderen 0:8d87bc453349 248 #if IP_ACCEPT_LINK_LAYER_ADDRESSING
ninoderkinderen 0:8d87bc453349 249 int check_ip_src=1;
ninoderkinderen 0:8d87bc453349 250 #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
ninoderkinderen 0:8d87bc453349 251
ninoderkinderen 0:8d87bc453349 252 IP_STATS_INC(ip.recv);
ninoderkinderen 0:8d87bc453349 253 snmp_inc_ipinreceives();
ninoderkinderen 0:8d87bc453349 254
ninoderkinderen 0:8d87bc453349 255 /* identify the IP header */
ninoderkinderen 0:8d87bc453349 256 iphdr = (struct ip_hdr *)p->payload;
ninoderkinderen 0:8d87bc453349 257 if (IPH_V(iphdr) != 4) {
ninoderkinderen 0:8d87bc453349 258 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
ninoderkinderen 0:8d87bc453349 259 ip_debug_print(p);
ninoderkinderen 0:8d87bc453349 260 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 261 IP_STATS_INC(ip.err);
ninoderkinderen 0:8d87bc453349 262 IP_STATS_INC(ip.drop);
ninoderkinderen 0:8d87bc453349 263 snmp_inc_ipinhdrerrors();
ninoderkinderen 0:8d87bc453349 264 return ERR_OK;
ninoderkinderen 0:8d87bc453349 265 }
ninoderkinderen 0:8d87bc453349 266
ninoderkinderen 0:8d87bc453349 267 /* obtain IP header length in number of 32-bit words */
ninoderkinderen 0:8d87bc453349 268 iphdr_hlen = IPH_HL(iphdr);
ninoderkinderen 0:8d87bc453349 269 /* calculate IP header length in bytes */
ninoderkinderen 0:8d87bc453349 270 iphdr_hlen *= 4;
ninoderkinderen 0:8d87bc453349 271 /* obtain ip length in bytes */
ninoderkinderen 0:8d87bc453349 272 iphdr_len = ntohs(IPH_LEN(iphdr));
ninoderkinderen 0:8d87bc453349 273
ninoderkinderen 0:8d87bc453349 274 /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
ninoderkinderen 0:8d87bc453349 275 if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len)) {
ninoderkinderen 0:8d87bc453349 276 if (iphdr_hlen > p->len) {
ninoderkinderen 0:8d87bc453349 277 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
ninoderkinderen 0:8d87bc453349 278 ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
ninoderkinderen 0:8d87bc453349 279 iphdr_hlen, p->len));
ninoderkinderen 0:8d87bc453349 280 }
ninoderkinderen 0:8d87bc453349 281 if (iphdr_len > p->tot_len) {
ninoderkinderen 0:8d87bc453349 282 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
ninoderkinderen 0:8d87bc453349 283 ("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
ninoderkinderen 0:8d87bc453349 284 iphdr_len, p->tot_len));
ninoderkinderen 0:8d87bc453349 285 }
ninoderkinderen 0:8d87bc453349 286 /* free (drop) packet pbufs */
ninoderkinderen 0:8d87bc453349 287 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 288 IP_STATS_INC(ip.lenerr);
ninoderkinderen 0:8d87bc453349 289 IP_STATS_INC(ip.drop);
ninoderkinderen 0:8d87bc453349 290 snmp_inc_ipindiscards();
ninoderkinderen 0:8d87bc453349 291 return ERR_OK;
ninoderkinderen 0:8d87bc453349 292 }
ninoderkinderen 0:8d87bc453349 293
ninoderkinderen 0:8d87bc453349 294 /* verify checksum */
ninoderkinderen 0:8d87bc453349 295 #if CHECKSUM_CHECK_IP
ninoderkinderen 0:8d87bc453349 296 if (inet_chksum(iphdr, iphdr_hlen) != 0) {
ninoderkinderen 0:8d87bc453349 297
ninoderkinderen 0:8d87bc453349 298 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
ninoderkinderen 0:8d87bc453349 299 ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
ninoderkinderen 0:8d87bc453349 300 ip_debug_print(p);
ninoderkinderen 0:8d87bc453349 301 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 302 IP_STATS_INC(ip.chkerr);
ninoderkinderen 0:8d87bc453349 303 IP_STATS_INC(ip.drop);
ninoderkinderen 0:8d87bc453349 304 snmp_inc_ipinhdrerrors();
ninoderkinderen 0:8d87bc453349 305 return ERR_OK;
ninoderkinderen 0:8d87bc453349 306 }
ninoderkinderen 0:8d87bc453349 307 #endif
ninoderkinderen 0:8d87bc453349 308
ninoderkinderen 0:8d87bc453349 309 /* Trim pbuf. This should have been done at the netif layer,
ninoderkinderen 0:8d87bc453349 310 * but we'll do it anyway just to be sure that its done. */
ninoderkinderen 0:8d87bc453349 311 pbuf_realloc(p, iphdr_len);
ninoderkinderen 0:8d87bc453349 312
ninoderkinderen 0:8d87bc453349 313 /* copy IP addresses to aligned ip_addr_t */
ninoderkinderen 0:8d87bc453349 314 ip_addr_copy(current_iphdr_dest, iphdr->dest);
ninoderkinderen 0:8d87bc453349 315 ip_addr_copy(current_iphdr_src, iphdr->src);
ninoderkinderen 0:8d87bc453349 316
ninoderkinderen 0:8d87bc453349 317 /* match packet against an interface, i.e. is this packet for us? */
ninoderkinderen 0:8d87bc453349 318 #if LWIP_IGMP
ninoderkinderen 0:8d87bc453349 319 if (ip_addr_ismulticast(&current_iphdr_dest)) {
ninoderkinderen 0:8d87bc453349 320 if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &current_iphdr_dest))) {
ninoderkinderen 0:8d87bc453349 321 netif = inp;
ninoderkinderen 0:8d87bc453349 322 } else {
ninoderkinderen 0:8d87bc453349 323 netif = NULL;
ninoderkinderen 0:8d87bc453349 324 }
ninoderkinderen 0:8d87bc453349 325 } else
ninoderkinderen 0:8d87bc453349 326 #endif /* LWIP_IGMP */
ninoderkinderen 0:8d87bc453349 327 {
ninoderkinderen 0:8d87bc453349 328 /* start trying with inp. if that's not acceptable, start walking the
ninoderkinderen 0:8d87bc453349 329 list of configured netifs.
ninoderkinderen 0:8d87bc453349 330 'first' is used as a boolean to mark whether we started walking the list */
ninoderkinderen 0:8d87bc453349 331 int first = 1;
ninoderkinderen 0:8d87bc453349 332 netif = inp;
ninoderkinderen 0:8d87bc453349 333 do {
ninoderkinderen 0:8d87bc453349 334 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",
ninoderkinderen 0:8d87bc453349 335 ip4_addr_get_u32(&iphdr->dest), ip4_addr_get_u32(&netif->ip_addr),
ninoderkinderen 0:8d87bc453349 336 ip4_addr_get_u32(&iphdr->dest) & ip4_addr_get_u32(&netif->netmask),
ninoderkinderen 0:8d87bc453349 337 ip4_addr_get_u32(&netif->ip_addr) & ip4_addr_get_u32(&netif->netmask),
ninoderkinderen 0:8d87bc453349 338 ip4_addr_get_u32(&iphdr->dest) & ~ip4_addr_get_u32(&netif->netmask)));
ninoderkinderen 0:8d87bc453349 339
ninoderkinderen 0:8d87bc453349 340 /* interface is up and configured? */
ninoderkinderen 0:8d87bc453349 341 if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
ninoderkinderen 0:8d87bc453349 342 /* unicast to this interface address? */
ninoderkinderen 0:8d87bc453349 343 if (ip_addr_cmp(&current_iphdr_dest, &(netif->ip_addr)) ||
ninoderkinderen 0:8d87bc453349 344 /* or broadcast on this interface network address? */
ninoderkinderen 0:8d87bc453349 345 ip_addr_isbroadcast(&current_iphdr_dest, netif)) {
ninoderkinderen 0:8d87bc453349 346 LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
ninoderkinderen 0:8d87bc453349 347 netif->name[0], netif->name[1]));
ninoderkinderen 0:8d87bc453349 348 /* break out of for loop */
ninoderkinderen 0:8d87bc453349 349 break;
ninoderkinderen 0:8d87bc453349 350 }
ninoderkinderen 0:8d87bc453349 351 #if LWIP_AUTOIP
ninoderkinderen 0:8d87bc453349 352 /* connections to link-local addresses must persist after changing
ninoderkinderen 0:8d87bc453349 353 the netif's address (RFC3927 ch. 1.9) */
ninoderkinderen 0:8d87bc453349 354 if ((netif->autoip != NULL) &&
ninoderkinderen 0:8d87bc453349 355 ip_addr_cmp(&current_iphdr_dest, &(netif->autoip->llipaddr))) {
ninoderkinderen 0:8d87bc453349 356 LWIP_DEBUGF(IP_DEBUG, ("ip_input: LLA packet accepted on interface %c%c\n",
ninoderkinderen 0:8d87bc453349 357 netif->name[0], netif->name[1]));
ninoderkinderen 0:8d87bc453349 358 /* break out of for loop */
ninoderkinderen 0:8d87bc453349 359 break;
ninoderkinderen 0:8d87bc453349 360 }
ninoderkinderen 0:8d87bc453349 361 #endif /* LWIP_AUTOIP */
ninoderkinderen 0:8d87bc453349 362 }
ninoderkinderen 0:8d87bc453349 363 if (first) {
ninoderkinderen 0:8d87bc453349 364 first = 0;
ninoderkinderen 0:8d87bc453349 365 netif = netif_list;
ninoderkinderen 0:8d87bc453349 366 } else {
ninoderkinderen 0:8d87bc453349 367 netif = netif->next;
ninoderkinderen 0:8d87bc453349 368 }
ninoderkinderen 0:8d87bc453349 369 if (netif == inp) {
ninoderkinderen 0:8d87bc453349 370 netif = netif->next;
ninoderkinderen 0:8d87bc453349 371 }
ninoderkinderen 0:8d87bc453349 372 } while(netif != NULL);
ninoderkinderen 0:8d87bc453349 373 }
ninoderkinderen 0:8d87bc453349 374
ninoderkinderen 0:8d87bc453349 375 #if IP_ACCEPT_LINK_LAYER_ADDRESSING
ninoderkinderen 0:8d87bc453349 376 /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
ninoderkinderen 0:8d87bc453349 377 * using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
ninoderkinderen 0:8d87bc453349 378 * According to RFC 1542 section 3.1.1, referred by RFC 2131).
ninoderkinderen 0:8d87bc453349 379 *
ninoderkinderen 0:8d87bc453349 380 * If you want to accept private broadcast communication while a netif is down,
ninoderkinderen 0:8d87bc453349 381 * define LWIP_IP_ACCEPT_UDP_PORT(dst_port), e.g.:
ninoderkinderen 0:8d87bc453349 382 *
ninoderkinderen 0:8d87bc453349 383 * #define LWIP_IP_ACCEPT_UDP_PORT(dst_port) ((dst_port) == PP_NTOHS(12345))
ninoderkinderen 0:8d87bc453349 384 */
ninoderkinderen 0:8d87bc453349 385 if (netif == NULL) {
ninoderkinderen 0:8d87bc453349 386 /* remote port is DHCP server? */
ninoderkinderen 0:8d87bc453349 387 if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
ninoderkinderen 0:8d87bc453349 388 struct udp_hdr *udphdr = (struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen);
ninoderkinderen 0:8d87bc453349 389 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
ninoderkinderen 0:8d87bc453349 390 ntohs(udphdr->dest)));
ninoderkinderen 0:8d87bc453349 391 if (IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(udphdr->dest)) {
ninoderkinderen 0:8d87bc453349 392 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: DHCP packet accepted.\n"));
ninoderkinderen 0:8d87bc453349 393 netif = inp;
ninoderkinderen 0:8d87bc453349 394 check_ip_src = 0;
ninoderkinderen 0:8d87bc453349 395 }
ninoderkinderen 0:8d87bc453349 396 }
ninoderkinderen 0:8d87bc453349 397 }
ninoderkinderen 0:8d87bc453349 398 #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
ninoderkinderen 0:8d87bc453349 399
ninoderkinderen 0:8d87bc453349 400 /* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
ninoderkinderen 0:8d87bc453349 401 #if IP_ACCEPT_LINK_LAYER_ADDRESSING
ninoderkinderen 0:8d87bc453349 402 /* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
ninoderkinderen 0:8d87bc453349 403 if (check_ip_src && !ip_addr_isany(&current_iphdr_src))
ninoderkinderen 0:8d87bc453349 404 #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
ninoderkinderen 0:8d87bc453349 405 { if ((ip_addr_isbroadcast(&current_iphdr_src, inp)) ||
ninoderkinderen 0:8d87bc453349 406 (ip_addr_ismulticast(&current_iphdr_src))) {
ninoderkinderen 0:8d87bc453349 407 /* packet source is not valid */
ninoderkinderen 0:8d87bc453349 408 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("ip_input: packet source is not valid.\n"));
ninoderkinderen 0:8d87bc453349 409 /* free (drop) packet pbufs */
ninoderkinderen 0:8d87bc453349 410 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 411 IP_STATS_INC(ip.drop);
ninoderkinderen 0:8d87bc453349 412 snmp_inc_ipinaddrerrors();
ninoderkinderen 0:8d87bc453349 413 snmp_inc_ipindiscards();
ninoderkinderen 0:8d87bc453349 414 return ERR_OK;
ninoderkinderen 0:8d87bc453349 415 }
ninoderkinderen 0:8d87bc453349 416 }
ninoderkinderen 0:8d87bc453349 417
ninoderkinderen 0:8d87bc453349 418 /* packet not for us? */
ninoderkinderen 0:8d87bc453349 419 if (netif == NULL) {
ninoderkinderen 0:8d87bc453349 420 /* packet not for us, route or discard */
ninoderkinderen 0:8d87bc453349 421 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: packet not for us.\n"));
ninoderkinderen 0:8d87bc453349 422 #if IP_FORWARD
ninoderkinderen 0:8d87bc453349 423 /* non-broadcast packet? */
ninoderkinderen 0:8d87bc453349 424 if (!ip_addr_isbroadcast(&current_iphdr_dest, inp)) {
ninoderkinderen 0:8d87bc453349 425 /* try to forward IP packet on (other) interfaces */
ninoderkinderen 0:8d87bc453349 426 ip_forward(p, iphdr, inp);
ninoderkinderen 0:8d87bc453349 427 } else
ninoderkinderen 0:8d87bc453349 428 #endif /* IP_FORWARD */
ninoderkinderen 0:8d87bc453349 429 {
ninoderkinderen 0:8d87bc453349 430 snmp_inc_ipinaddrerrors();
ninoderkinderen 0:8d87bc453349 431 snmp_inc_ipindiscards();
ninoderkinderen 0:8d87bc453349 432 }
ninoderkinderen 0:8d87bc453349 433 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 434 return ERR_OK;
ninoderkinderen 0:8d87bc453349 435 }
ninoderkinderen 0:8d87bc453349 436 /* packet consists of multiple fragments? */
ninoderkinderen 0:8d87bc453349 437 if ((IPH_OFFSET(iphdr) & PP_HTONS(IP_OFFMASK | IP_MF)) != 0) {
ninoderkinderen 0:8d87bc453349 438 #if IP_REASSEMBLY /* packet fragment reassembly code present? */
ninoderkinderen 0:8d87bc453349 439 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",
ninoderkinderen 0:8d87bc453349 440 ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & PP_HTONS(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)*8));
ninoderkinderen 0:8d87bc453349 441 /* reassemble the packet*/
ninoderkinderen 0:8d87bc453349 442 p = ip_reass(p);
ninoderkinderen 0:8d87bc453349 443 /* packet not fully reassembled yet? */
ninoderkinderen 0:8d87bc453349 444 if (p == NULL) {
ninoderkinderen 0:8d87bc453349 445 return ERR_OK;
ninoderkinderen 0:8d87bc453349 446 }
ninoderkinderen 0:8d87bc453349 447 iphdr = (struct ip_hdr *)p->payload;
ninoderkinderen 0:8d87bc453349 448 #else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
ninoderkinderen 0:8d87bc453349 449 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 450 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
ninoderkinderen 0:8d87bc453349 451 ntohs(IPH_OFFSET(iphdr))));
ninoderkinderen 0:8d87bc453349 452 IP_STATS_INC(ip.opterr);
ninoderkinderen 0:8d87bc453349 453 IP_STATS_INC(ip.drop);
ninoderkinderen 0:8d87bc453349 454 /* unsupported protocol feature */
ninoderkinderen 0:8d87bc453349 455 snmp_inc_ipinunknownprotos();
ninoderkinderen 0:8d87bc453349 456 return ERR_OK;
ninoderkinderen 0:8d87bc453349 457 #endif /* IP_REASSEMBLY */
ninoderkinderen 0:8d87bc453349 458 }
ninoderkinderen 0:8d87bc453349 459
ninoderkinderen 0:8d87bc453349 460 #if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
ninoderkinderen 0:8d87bc453349 461
ninoderkinderen 0:8d87bc453349 462 #if LWIP_IGMP
ninoderkinderen 0:8d87bc453349 463 /* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
ninoderkinderen 0:8d87bc453349 464 if((iphdr_hlen > IP_HLEN) && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
ninoderkinderen 0:8d87bc453349 465 #else
ninoderkinderen 0:8d87bc453349 466 if (iphdr_hlen > IP_HLEN) {
ninoderkinderen 0:8d87bc453349 467 #endif /* LWIP_IGMP */
ninoderkinderen 0:8d87bc453349 468 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
ninoderkinderen 0:8d87bc453349 469 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 470 IP_STATS_INC(ip.opterr);
ninoderkinderen 0:8d87bc453349 471 IP_STATS_INC(ip.drop);
ninoderkinderen 0:8d87bc453349 472 /* unsupported protocol feature */
ninoderkinderen 0:8d87bc453349 473 snmp_inc_ipinunknownprotos();
ninoderkinderen 0:8d87bc453349 474 return ERR_OK;
ninoderkinderen 0:8d87bc453349 475 }
ninoderkinderen 0:8d87bc453349 476 #endif /* IP_OPTIONS_ALLOWED == 0 */
ninoderkinderen 0:8d87bc453349 477
ninoderkinderen 0:8d87bc453349 478 /* send to upper layers */
ninoderkinderen 0:8d87bc453349 479 LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
ninoderkinderen 0:8d87bc453349 480 ip_debug_print(p);
ninoderkinderen 0:8d87bc453349 481 LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
ninoderkinderen 0:8d87bc453349 482
ninoderkinderen 0:8d87bc453349 483 current_netif = inp;
ninoderkinderen 0:8d87bc453349 484 current_header = iphdr;
ninoderkinderen 0:8d87bc453349 485
ninoderkinderen 0:8d87bc453349 486 #if LWIP_RAW
ninoderkinderen 0:8d87bc453349 487 /* raw input did not eat the packet? */
ninoderkinderen 0:8d87bc453349 488 if (raw_input(p, inp) == 0)
ninoderkinderen 0:8d87bc453349 489 #endif /* LWIP_RAW */
ninoderkinderen 0:8d87bc453349 490 {
ninoderkinderen 0:8d87bc453349 491
ninoderkinderen 0:8d87bc453349 492 switch (IPH_PROTO(iphdr)) {
ninoderkinderen 0:8d87bc453349 493 #if LWIP_UDP
ninoderkinderen 0:8d87bc453349 494 case IP_PROTO_UDP:
ninoderkinderen 0:8d87bc453349 495 #if LWIP_UDPLITE
ninoderkinderen 0:8d87bc453349 496 case IP_PROTO_UDPLITE:
ninoderkinderen 0:8d87bc453349 497 #endif /* LWIP_UDPLITE */
ninoderkinderen 0:8d87bc453349 498 snmp_inc_ipindelivers();
ninoderkinderen 0:8d87bc453349 499 udp_input(p, inp);
ninoderkinderen 0:8d87bc453349 500 break;
ninoderkinderen 0:8d87bc453349 501 #endif /* LWIP_UDP */
ninoderkinderen 0:8d87bc453349 502 #if LWIP_TCP
ninoderkinderen 0:8d87bc453349 503 case IP_PROTO_TCP:
ninoderkinderen 0:8d87bc453349 504 snmp_inc_ipindelivers();
ninoderkinderen 0:8d87bc453349 505 tcp_input(p, inp);
ninoderkinderen 0:8d87bc453349 506 break;
ninoderkinderen 0:8d87bc453349 507 #endif /* LWIP_TCP */
ninoderkinderen 0:8d87bc453349 508 #if LWIP_ICMP
ninoderkinderen 0:8d87bc453349 509 case IP_PROTO_ICMP:
ninoderkinderen 0:8d87bc453349 510 snmp_inc_ipindelivers();
ninoderkinderen 0:8d87bc453349 511 icmp_input(p, inp);
ninoderkinderen 0:8d87bc453349 512 break;
ninoderkinderen 0:8d87bc453349 513 #endif /* LWIP_ICMP */
ninoderkinderen 0:8d87bc453349 514 #if LWIP_IGMP
ninoderkinderen 0:8d87bc453349 515 case IP_PROTO_IGMP:
ninoderkinderen 0:8d87bc453349 516 igmp_input(p, inp, &current_iphdr_dest);
ninoderkinderen 0:8d87bc453349 517 break;
ninoderkinderen 0:8d87bc453349 518 #endif /* LWIP_IGMP */
ninoderkinderen 0:8d87bc453349 519 default:
ninoderkinderen 0:8d87bc453349 520 #if LWIP_ICMP
ninoderkinderen 0:8d87bc453349 521 /* send ICMP destination protocol unreachable unless is was a broadcast */
ninoderkinderen 0:8d87bc453349 522 if (!ip_addr_isbroadcast(&current_iphdr_dest, inp) &&
ninoderkinderen 0:8d87bc453349 523 !ip_addr_ismulticast(&current_iphdr_dest)) {
ninoderkinderen 0:8d87bc453349 524 p->payload = iphdr;
ninoderkinderen 0:8d87bc453349 525 icmp_dest_unreach(p, ICMP_DUR_PROTO);
ninoderkinderen 0:8d87bc453349 526 }
ninoderkinderen 0:8d87bc453349 527 #endif /* LWIP_ICMP */
ninoderkinderen 0:8d87bc453349 528 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 529
ninoderkinderen 0:8d87bc453349 530 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
ninoderkinderen 0:8d87bc453349 531
ninoderkinderen 0:8d87bc453349 532 IP_STATS_INC(ip.proterr);
ninoderkinderen 0:8d87bc453349 533 IP_STATS_INC(ip.drop);
ninoderkinderen 0:8d87bc453349 534 snmp_inc_ipinunknownprotos();
ninoderkinderen 0:8d87bc453349 535 }
ninoderkinderen 0:8d87bc453349 536 }
ninoderkinderen 0:8d87bc453349 537
ninoderkinderen 0:8d87bc453349 538 current_netif = NULL;
ninoderkinderen 0:8d87bc453349 539 current_header = NULL;
ninoderkinderen 0:8d87bc453349 540 ip_addr_set_any(&current_iphdr_src);
ninoderkinderen 0:8d87bc453349 541 ip_addr_set_any(&current_iphdr_dest);
ninoderkinderen 0:8d87bc453349 542
ninoderkinderen 0:8d87bc453349 543 return ERR_OK;
ninoderkinderen 0:8d87bc453349 544 }
ninoderkinderen 0:8d87bc453349 545
ninoderkinderen 0:8d87bc453349 546 /**
ninoderkinderen 0:8d87bc453349 547 * Sends an IP packet on a network interface. This function constructs
ninoderkinderen 0:8d87bc453349 548 * the IP header and calculates the IP header checksum. If the source
ninoderkinderen 0:8d87bc453349 549 * IP address is NULL, the IP address of the outgoing network
ninoderkinderen 0:8d87bc453349 550 * interface is filled in as source address.
ninoderkinderen 0:8d87bc453349 551 * If the destination IP address is IP_HDRINCL, p is assumed to already
ninoderkinderen 0:8d87bc453349 552 * include an IP header and p->payload points to it instead of the data.
ninoderkinderen 0:8d87bc453349 553 *
ninoderkinderen 0:8d87bc453349 554 * @param p the packet to send (p->payload points to the data, e.g. next
ninoderkinderen 0:8d87bc453349 555 protocol header; if dest == IP_HDRINCL, p already includes an IP
ninoderkinderen 0:8d87bc453349 556 header and p->payload points to that IP header)
ninoderkinderen 0:8d87bc453349 557 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
ninoderkinderen 0:8d87bc453349 558 * IP address of the netif used to send is used as source address)
ninoderkinderen 0:8d87bc453349 559 * @param dest the destination IP address to send the packet to
ninoderkinderen 0:8d87bc453349 560 * @param ttl the TTL value to be set in the IP header
ninoderkinderen 0:8d87bc453349 561 * @param tos the TOS value to be set in the IP header
ninoderkinderen 0:8d87bc453349 562 * @param proto the PROTOCOL to be set in the IP header
ninoderkinderen 0:8d87bc453349 563 * @param netif the netif on which to send this packet
ninoderkinderen 0:8d87bc453349 564 * @return ERR_OK if the packet was sent OK
ninoderkinderen 0:8d87bc453349 565 * ERR_BUF if p doesn't have enough space for IP/LINK headers
ninoderkinderen 0:8d87bc453349 566 * returns errors returned by netif->output
ninoderkinderen 0:8d87bc453349 567 *
ninoderkinderen 0:8d87bc453349 568 * @note ip_id: RFC791 "some host may be able to simply use
ninoderkinderen 0:8d87bc453349 569 * unique identifiers independent of destination"
ninoderkinderen 0:8d87bc453349 570 */
ninoderkinderen 0:8d87bc453349 571 err_t
ninoderkinderen 0:8d87bc453349 572 ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
ninoderkinderen 0:8d87bc453349 573 u8_t ttl, u8_t tos,
ninoderkinderen 0:8d87bc453349 574 u8_t proto, struct netif *netif)
ninoderkinderen 0:8d87bc453349 575 {
ninoderkinderen 0:8d87bc453349 576 #if IP_OPTIONS_SEND
ninoderkinderen 0:8d87bc453349 577 return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
ninoderkinderen 0:8d87bc453349 578 }
ninoderkinderen 0:8d87bc453349 579
ninoderkinderen 0:8d87bc453349 580 /**
ninoderkinderen 0:8d87bc453349 581 * Same as ip_output_if() but with the possibility to include IP options:
ninoderkinderen 0:8d87bc453349 582 *
ninoderkinderen 0:8d87bc453349 583 * @ param ip_options pointer to the IP options, copied into the IP header
ninoderkinderen 0:8d87bc453349 584 * @ param optlen length of ip_options
ninoderkinderen 0:8d87bc453349 585 */
ninoderkinderen 0:8d87bc453349 586 err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
ninoderkinderen 0:8d87bc453349 587 u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
ninoderkinderen 0:8d87bc453349 588 u16_t optlen)
ninoderkinderen 0:8d87bc453349 589 {
ninoderkinderen 0:8d87bc453349 590 #endif /* IP_OPTIONS_SEND */
ninoderkinderen 0:8d87bc453349 591 struct ip_hdr *iphdr;
ninoderkinderen 0:8d87bc453349 592 ip_addr_t dest_addr;
ninoderkinderen 0:8d87bc453349 593 #if CHECKSUM_GEN_IP_INLINE
ninoderkinderen 0:8d87bc453349 594 u32_t chk_sum = 0;
ninoderkinderen 0:8d87bc453349 595 #endif /* CHECKSUM_GEN_IP_INLINE */
ninoderkinderen 0:8d87bc453349 596
ninoderkinderen 0:8d87bc453349 597 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
ninoderkinderen 0:8d87bc453349 598 gets altered as the packet is passed down the stack */
ninoderkinderen 0:8d87bc453349 599 LWIP_ASSERT("p->ref == 1", p->ref == 1);
ninoderkinderen 0:8d87bc453349 600
ninoderkinderen 0:8d87bc453349 601 snmp_inc_ipoutrequests();
ninoderkinderen 0:8d87bc453349 602
ninoderkinderen 0:8d87bc453349 603 /* Should the IP header be generated or is it already included in p? */
ninoderkinderen 0:8d87bc453349 604 if (dest != IP_HDRINCL) {
ninoderkinderen 0:8d87bc453349 605 u16_t ip_hlen = IP_HLEN;
ninoderkinderen 0:8d87bc453349 606 #if IP_OPTIONS_SEND
ninoderkinderen 0:8d87bc453349 607 u16_t optlen_aligned = 0;
ninoderkinderen 0:8d87bc453349 608 if (optlen != 0) {
ninoderkinderen 0:8d87bc453349 609 #if CHECKSUM_GEN_IP_INLINE
ninoderkinderen 0:8d87bc453349 610 int i;
ninoderkinderen 0:8d87bc453349 611 #endif /* CHECKSUM_GEN_IP_INLINE */
ninoderkinderen 0:8d87bc453349 612 /* round up to a multiple of 4 */
ninoderkinderen 0:8d87bc453349 613 optlen_aligned = ((optlen + 3) & ~3);
ninoderkinderen 0:8d87bc453349 614 ip_hlen += optlen_aligned;
ninoderkinderen 0:8d87bc453349 615 /* First write in the IP options */
ninoderkinderen 0:8d87bc453349 616 if (pbuf_header(p, optlen_aligned)) {
ninoderkinderen 0:8d87bc453349 617 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
ninoderkinderen 0:8d87bc453349 618 IP_STATS_INC(ip.err);
ninoderkinderen 0:8d87bc453349 619 snmp_inc_ipoutdiscards();
ninoderkinderen 0:8d87bc453349 620 return ERR_BUF;
ninoderkinderen 0:8d87bc453349 621 }
ninoderkinderen 0:8d87bc453349 622 MEMCPY(p->payload, ip_options, optlen);
ninoderkinderen 0:8d87bc453349 623 if (optlen < optlen_aligned) {
ninoderkinderen 0:8d87bc453349 624 /* zero the remaining bytes */
ninoderkinderen 0:8d87bc453349 625 memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
ninoderkinderen 0:8d87bc453349 626 }
ninoderkinderen 0:8d87bc453349 627 #if CHECKSUM_GEN_IP_INLINE
ninoderkinderen 0:8d87bc453349 628 for (i = 0; i < optlen_aligned; i += sizeof(u16_t)) {
ninoderkinderen 0:8d87bc453349 629 chk_sum += ((u16_t*)p->payload)[i];
ninoderkinderen 0:8d87bc453349 630 }
ninoderkinderen 0:8d87bc453349 631 #endif /* CHECKSUM_GEN_IP_INLINE */
ninoderkinderen 0:8d87bc453349 632 }
ninoderkinderen 0:8d87bc453349 633 #endif /* IP_OPTIONS_SEND */
ninoderkinderen 0:8d87bc453349 634 /* generate IP header */
ninoderkinderen 0:8d87bc453349 635 if (pbuf_header(p, IP_HLEN)) {
ninoderkinderen 0:8d87bc453349 636 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output: not enough room for IP header in pbuf\n"));
ninoderkinderen 0:8d87bc453349 637
ninoderkinderen 0:8d87bc453349 638 IP_STATS_INC(ip.err);
ninoderkinderen 0:8d87bc453349 639 snmp_inc_ipoutdiscards();
ninoderkinderen 0:8d87bc453349 640 return ERR_BUF;
ninoderkinderen 0:8d87bc453349 641 }
ninoderkinderen 0:8d87bc453349 642
ninoderkinderen 0:8d87bc453349 643 iphdr = (struct ip_hdr *)p->payload;
ninoderkinderen 0:8d87bc453349 644 LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
ninoderkinderen 0:8d87bc453349 645 (p->len >= sizeof(struct ip_hdr)));
ninoderkinderen 0:8d87bc453349 646
ninoderkinderen 0:8d87bc453349 647 IPH_TTL_SET(iphdr, ttl);
ninoderkinderen 0:8d87bc453349 648 IPH_PROTO_SET(iphdr, proto);
ninoderkinderen 0:8d87bc453349 649 #if CHECKSUM_GEN_IP_INLINE
ninoderkinderen 0:8d87bc453349 650 chk_sum += LWIP_MAKE_U16(proto, ttl);
ninoderkinderen 0:8d87bc453349 651 #endif /* CHECKSUM_GEN_IP_INLINE */
ninoderkinderen 0:8d87bc453349 652
ninoderkinderen 0:8d87bc453349 653 /* dest cannot be NULL here */
ninoderkinderen 0:8d87bc453349 654 ip_addr_copy(iphdr->dest, *dest);
ninoderkinderen 0:8d87bc453349 655 #if CHECKSUM_GEN_IP_INLINE
ninoderkinderen 0:8d87bc453349 656 chk_sum += ip4_addr_get_u32(&iphdr->dest) & 0xFFFF;
ninoderkinderen 0:8d87bc453349 657 chk_sum += ip4_addr_get_u32(&iphdr->dest) >> 16;
ninoderkinderen 0:8d87bc453349 658 #endif /* CHECKSUM_GEN_IP_INLINE */
ninoderkinderen 0:8d87bc453349 659
ninoderkinderen 0:8d87bc453349 660 IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
ninoderkinderen 0:8d87bc453349 661 #if CHECKSUM_GEN_IP_INLINE
ninoderkinderen 0:8d87bc453349 662 chk_sum += iphdr->_v_hl_tos;
ninoderkinderen 0:8d87bc453349 663 #endif /* CHECKSUM_GEN_IP_INLINE */
ninoderkinderen 0:8d87bc453349 664 IPH_LEN_SET(iphdr, htons(p->tot_len));
ninoderkinderen 0:8d87bc453349 665 #if CHECKSUM_GEN_IP_INLINE
ninoderkinderen 0:8d87bc453349 666 chk_sum += iphdr->_len;
ninoderkinderen 0:8d87bc453349 667 #endif /* CHECKSUM_GEN_IP_INLINE */
ninoderkinderen 0:8d87bc453349 668 IPH_OFFSET_SET(iphdr, 0);
ninoderkinderen 0:8d87bc453349 669 IPH_ID_SET(iphdr, htons(ip_id));
ninoderkinderen 0:8d87bc453349 670 #if CHECKSUM_GEN_IP_INLINE
ninoderkinderen 0:8d87bc453349 671 chk_sum += iphdr->_id;
ninoderkinderen 0:8d87bc453349 672 #endif /* CHECKSUM_GEN_IP_INLINE */
ninoderkinderen 0:8d87bc453349 673 ++ip_id;
ninoderkinderen 0:8d87bc453349 674
ninoderkinderen 0:8d87bc453349 675 if (ip_addr_isany(src)) {
ninoderkinderen 0:8d87bc453349 676 ip_addr_copy(iphdr->src, netif->ip_addr);
ninoderkinderen 0:8d87bc453349 677 } else {
ninoderkinderen 0:8d87bc453349 678 /* src cannot be NULL here */
ninoderkinderen 0:8d87bc453349 679 ip_addr_copy(iphdr->src, *src);
ninoderkinderen 0:8d87bc453349 680 }
ninoderkinderen 0:8d87bc453349 681
ninoderkinderen 0:8d87bc453349 682 #if CHECKSUM_GEN_IP_INLINE
ninoderkinderen 0:8d87bc453349 683 chk_sum += ip4_addr_get_u32(&iphdr->src) & 0xFFFF;
ninoderkinderen 0:8d87bc453349 684 chk_sum += ip4_addr_get_u32(&iphdr->src) >> 16;
ninoderkinderen 0:8d87bc453349 685 chk_sum = (chk_sum >> 16) + (chk_sum & 0xFFFF);
ninoderkinderen 0:8d87bc453349 686 chk_sum = (chk_sum >> 16) + chk_sum;
ninoderkinderen 0:8d87bc453349 687 chk_sum = ~chk_sum;
ninoderkinderen 0:8d87bc453349 688 iphdr->_chksum = chk_sum; /* network order */
ninoderkinderen 0:8d87bc453349 689 #else /* CHECKSUM_GEN_IP_INLINE */
ninoderkinderen 0:8d87bc453349 690 IPH_CHKSUM_SET(iphdr, 0);
ninoderkinderen 0:8d87bc453349 691 #if CHECKSUM_GEN_IP
ninoderkinderen 0:8d87bc453349 692 IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
ninoderkinderen 0:8d87bc453349 693 #endif
ninoderkinderen 0:8d87bc453349 694 #endif /* CHECKSUM_GEN_IP_INLINE */
ninoderkinderen 0:8d87bc453349 695 } else {
ninoderkinderen 0:8d87bc453349 696 /* IP header already included in p */
ninoderkinderen 0:8d87bc453349 697 iphdr = (struct ip_hdr *)p->payload;
ninoderkinderen 0:8d87bc453349 698 ip_addr_copy(dest_addr, iphdr->dest);
ninoderkinderen 0:8d87bc453349 699 dest = &dest_addr;
ninoderkinderen 0:8d87bc453349 700 }
ninoderkinderen 0:8d87bc453349 701
ninoderkinderen 0:8d87bc453349 702 IP_STATS_INC(ip.xmit);
ninoderkinderen 0:8d87bc453349 703
ninoderkinderen 0:8d87bc453349 704 LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
ninoderkinderen 0:8d87bc453349 705 ip_debug_print(p);
ninoderkinderen 0:8d87bc453349 706
ninoderkinderen 0:8d87bc453349 707 #if ENABLE_LOOPBACK
ninoderkinderen 0:8d87bc453349 708 if (ip_addr_cmp(dest, &netif->ip_addr)) {
ninoderkinderen 0:8d87bc453349 709 /* Packet to self, enqueue it for loopback */
ninoderkinderen 0:8d87bc453349 710 LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
ninoderkinderen 0:8d87bc453349 711 return netif_loop_output(netif, p, dest);
ninoderkinderen 0:8d87bc453349 712 }
ninoderkinderen 0:8d87bc453349 713 #if LWIP_IGMP
ninoderkinderen 0:8d87bc453349 714 if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) {
ninoderkinderen 0:8d87bc453349 715 netif_loop_output(netif, p, dest);
ninoderkinderen 0:8d87bc453349 716 }
ninoderkinderen 0:8d87bc453349 717 #endif /* LWIP_IGMP */
ninoderkinderen 0:8d87bc453349 718 #endif /* ENABLE_LOOPBACK */
ninoderkinderen 0:8d87bc453349 719 #if IP_FRAG
ninoderkinderen 0:8d87bc453349 720 /* don't fragment if interface has mtu set to 0 [loopif] */
ninoderkinderen 0:8d87bc453349 721 if (netif->mtu && (p->tot_len > netif->mtu)) {
ninoderkinderen 0:8d87bc453349 722 return ip_frag(p, netif, dest);
ninoderkinderen 0:8d87bc453349 723 }
ninoderkinderen 0:8d87bc453349 724 #endif /* IP_FRAG */
ninoderkinderen 0:8d87bc453349 725
ninoderkinderen 0:8d87bc453349 726 LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
ninoderkinderen 0:8d87bc453349 727 return netif->output(netif, p, dest);
ninoderkinderen 0:8d87bc453349 728 }
ninoderkinderen 0:8d87bc453349 729
ninoderkinderen 0:8d87bc453349 730 /**
ninoderkinderen 0:8d87bc453349 731 * Simple interface to ip_output_if. It finds the outgoing network
ninoderkinderen 0:8d87bc453349 732 * interface and calls upon ip_output_if to do the actual work.
ninoderkinderen 0:8d87bc453349 733 *
ninoderkinderen 0:8d87bc453349 734 * @param p the packet to send (p->payload points to the data, e.g. next
ninoderkinderen 0:8d87bc453349 735 protocol header; if dest == IP_HDRINCL, p already includes an IP
ninoderkinderen 0:8d87bc453349 736 header and p->payload points to that IP header)
ninoderkinderen 0:8d87bc453349 737 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
ninoderkinderen 0:8d87bc453349 738 * IP address of the netif used to send is used as source address)
ninoderkinderen 0:8d87bc453349 739 * @param dest the destination IP address to send the packet to
ninoderkinderen 0:8d87bc453349 740 * @param ttl the TTL value to be set in the IP header
ninoderkinderen 0:8d87bc453349 741 * @param tos the TOS value to be set in the IP header
ninoderkinderen 0:8d87bc453349 742 * @param proto the PROTOCOL to be set in the IP header
ninoderkinderen 0:8d87bc453349 743 *
ninoderkinderen 0:8d87bc453349 744 * @return ERR_RTE if no route is found
ninoderkinderen 0:8d87bc453349 745 * see ip_output_if() for more return values
ninoderkinderen 0:8d87bc453349 746 */
ninoderkinderen 0:8d87bc453349 747 err_t
ninoderkinderen 0:8d87bc453349 748 ip_output(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
ninoderkinderen 0:8d87bc453349 749 u8_t ttl, u8_t tos, u8_t proto)
ninoderkinderen 0:8d87bc453349 750 {
ninoderkinderen 0:8d87bc453349 751 struct netif *netif;
ninoderkinderen 0:8d87bc453349 752
ninoderkinderen 0:8d87bc453349 753 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
ninoderkinderen 0:8d87bc453349 754 gets altered as the packet is passed down the stack */
ninoderkinderen 0:8d87bc453349 755 LWIP_ASSERT("p->ref == 1", p->ref == 1);
ninoderkinderen 0:8d87bc453349 756
ninoderkinderen 0:8d87bc453349 757 if ((netif = ip_route(dest)) == NULL) {
ninoderkinderen 0:8d87bc453349 758 LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
ninoderkinderen 0:8d87bc453349 759 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
ninoderkinderen 0:8d87bc453349 760 IP_STATS_INC(ip.rterr);
ninoderkinderen 0:8d87bc453349 761 return ERR_RTE;
ninoderkinderen 0:8d87bc453349 762 }
ninoderkinderen 0:8d87bc453349 763
ninoderkinderen 0:8d87bc453349 764 return ip_output_if(p, src, dest, ttl, tos, proto, netif);
ninoderkinderen 0:8d87bc453349 765 }
ninoderkinderen 0:8d87bc453349 766
ninoderkinderen 0:8d87bc453349 767 #if LWIP_NETIF_HWADDRHINT
ninoderkinderen 0:8d87bc453349 768 /** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
ninoderkinderen 0:8d87bc453349 769 * before calling ip_output_if.
ninoderkinderen 0:8d87bc453349 770 *
ninoderkinderen 0:8d87bc453349 771 * @param p the packet to send (p->payload points to the data, e.g. next
ninoderkinderen 0:8d87bc453349 772 protocol header; if dest == IP_HDRINCL, p already includes an IP
ninoderkinderen 0:8d87bc453349 773 header and p->payload points to that IP header)
ninoderkinderen 0:8d87bc453349 774 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
ninoderkinderen 0:8d87bc453349 775 * IP address of the netif used to send is used as source address)
ninoderkinderen 0:8d87bc453349 776 * @param dest the destination IP address to send the packet to
ninoderkinderen 0:8d87bc453349 777 * @param ttl the TTL value to be set in the IP header
ninoderkinderen 0:8d87bc453349 778 * @param tos the TOS value to be set in the IP header
ninoderkinderen 0:8d87bc453349 779 * @param proto the PROTOCOL to be set in the IP header
ninoderkinderen 0:8d87bc453349 780 * @param addr_hint address hint pointer set to netif->addr_hint before
ninoderkinderen 0:8d87bc453349 781 * calling ip_output_if()
ninoderkinderen 0:8d87bc453349 782 *
ninoderkinderen 0:8d87bc453349 783 * @return ERR_RTE if no route is found
ninoderkinderen 0:8d87bc453349 784 * see ip_output_if() for more return values
ninoderkinderen 0:8d87bc453349 785 */
ninoderkinderen 0:8d87bc453349 786 err_t
ninoderkinderen 0:8d87bc453349 787 ip_output_hinted(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
ninoderkinderen 0:8d87bc453349 788 u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
ninoderkinderen 0:8d87bc453349 789 {
ninoderkinderen 0:8d87bc453349 790 struct netif *netif;
ninoderkinderen 0:8d87bc453349 791 err_t err;
ninoderkinderen 0:8d87bc453349 792
ninoderkinderen 0:8d87bc453349 793 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
ninoderkinderen 0:8d87bc453349 794 gets altered as the packet is passed down the stack */
ninoderkinderen 0:8d87bc453349 795 LWIP_ASSERT("p->ref == 1", p->ref == 1);
ninoderkinderen 0:8d87bc453349 796
ninoderkinderen 0:8d87bc453349 797 if ((netif = ip_route(dest)) == NULL) {
ninoderkinderen 0:8d87bc453349 798 LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
ninoderkinderen 0:8d87bc453349 799 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
ninoderkinderen 0:8d87bc453349 800 IP_STATS_INC(ip.rterr);
ninoderkinderen 0:8d87bc453349 801 return ERR_RTE;
ninoderkinderen 0:8d87bc453349 802 }
ninoderkinderen 0:8d87bc453349 803
ninoderkinderen 0:8d87bc453349 804 netif->addr_hint = addr_hint;
ninoderkinderen 0:8d87bc453349 805 err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
ninoderkinderen 0:8d87bc453349 806 netif->addr_hint = NULL;
ninoderkinderen 0:8d87bc453349 807
ninoderkinderen 0:8d87bc453349 808 return err;
ninoderkinderen 0:8d87bc453349 809 }
ninoderkinderen 0:8d87bc453349 810 #endif /* LWIP_NETIF_HWADDRHINT*/
ninoderkinderen 0:8d87bc453349 811
ninoderkinderen 0:8d87bc453349 812 #if IP_DEBUG
ninoderkinderen 0:8d87bc453349 813 /* Print an IP header by using LWIP_DEBUGF
ninoderkinderen 0:8d87bc453349 814 * @param p an IP packet, p->payload pointing to the IP header
ninoderkinderen 0:8d87bc453349 815 */
ninoderkinderen 0:8d87bc453349 816 void
ninoderkinderen 0:8d87bc453349 817 ip_debug_print(struct pbuf *p)
ninoderkinderen 0:8d87bc453349 818 {
ninoderkinderen 0:8d87bc453349 819 struct ip_hdr *iphdr = (struct ip_hdr *)p->payload;
ninoderkinderen 0:8d87bc453349 820 u8_t *payload;
ninoderkinderen 0:8d87bc453349 821
ninoderkinderen 0:8d87bc453349 822 payload = (u8_t *)iphdr + IP_HLEN;
ninoderkinderen 0:8d87bc453349 823
ninoderkinderen 0:8d87bc453349 824 LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
ninoderkinderen 0:8d87bc453349 825 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 826 LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n",
ninoderkinderen 0:8d87bc453349 827 IPH_V(iphdr),
ninoderkinderen 0:8d87bc453349 828 IPH_HL(iphdr),
ninoderkinderen 0:8d87bc453349 829 IPH_TOS(iphdr),
ninoderkinderen 0:8d87bc453349 830 ntohs(IPH_LEN(iphdr))));
ninoderkinderen 0:8d87bc453349 831 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 832 LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n",
ninoderkinderen 0:8d87bc453349 833 ntohs(IPH_ID(iphdr)),
ninoderkinderen 0:8d87bc453349 834 ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
ninoderkinderen 0:8d87bc453349 835 ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
ninoderkinderen 0:8d87bc453349 836 ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
ninoderkinderen 0:8d87bc453349 837 ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
ninoderkinderen 0:8d87bc453349 838 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 839 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n",
ninoderkinderen 0:8d87bc453349 840 IPH_TTL(iphdr),
ninoderkinderen 0:8d87bc453349 841 IPH_PROTO(iphdr),
ninoderkinderen 0:8d87bc453349 842 ntohs(IPH_CHKSUM(iphdr))));
ninoderkinderen 0:8d87bc453349 843 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 844 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n",
ninoderkinderen 0:8d87bc453349 845 ip4_addr1_16(&iphdr->src),
ninoderkinderen 0:8d87bc453349 846 ip4_addr2_16(&iphdr->src),
ninoderkinderen 0:8d87bc453349 847 ip4_addr3_16(&iphdr->src),
ninoderkinderen 0:8d87bc453349 848 ip4_addr4_16(&iphdr->src)));
ninoderkinderen 0:8d87bc453349 849 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 850 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n",
ninoderkinderen 0:8d87bc453349 851 ip4_addr1_16(&iphdr->dest),
ninoderkinderen 0:8d87bc453349 852 ip4_addr2_16(&iphdr->dest),
ninoderkinderen 0:8d87bc453349 853 ip4_addr3_16(&iphdr->dest),
ninoderkinderen 0:8d87bc453349 854 ip4_addr4_16(&iphdr->dest)));
ninoderkinderen 0:8d87bc453349 855 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
ninoderkinderen 0:8d87bc453349 856 }
ninoderkinderen 0:8d87bc453349 857 #endif /* IP_DEBUG */