VZTECH / lwip

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Fork of lwip by mbed official

core/ipv4/ip.c@29:da6f39d13880, 2015-01-08 (annotated)

Committer:
klauss
Date:
Thu Jan 08 23:42:30 2015 +0000
Revision:
29:da6f39d13880
Parent:
11:4b3f6f8b92d2 
wip

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:51ac1d130fd4 1 /**
mbed_official 0:51ac1d130fd4 2 * @file
mbed_official 0:51ac1d130fd4 3 * This is the IPv4 layer implementation for incoming and outgoing IP traffic.
mbed_official 0:51ac1d130fd4 4 *
mbed_official 0:51ac1d130fd4 5 * @see ip_frag.c
mbed_official 0:51ac1d130fd4 6 *
mbed_official 0:51ac1d130fd4 7 */
mbed_official 0:51ac1d130fd4 8
mbed_official 0:51ac1d130fd4 9 /*
mbed_official 0:51ac1d130fd4 10 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mbed_official 0:51ac1d130fd4 11 * All rights reserved.
mbed_official 0:51ac1d130fd4 12 *
mbed_official 0:51ac1d130fd4 13 * Redistribution and use in source and binary forms, with or without modification,
mbed_official 0:51ac1d130fd4 14 * are permitted provided that the following conditions are met:
mbed_official 0:51ac1d130fd4 15 *
mbed_official 0:51ac1d130fd4 16 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 0:51ac1d130fd4 17 * this list of conditions and the following disclaimer.
mbed_official 0:51ac1d130fd4 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 0:51ac1d130fd4 19 * this list of conditions and the following disclaimer in the documentation
mbed_official 0:51ac1d130fd4 20 * and/or other materials provided with the distribution.
mbed_official 0:51ac1d130fd4 21 * 3. The name of the author may not be used to endorse or promote products
mbed_official 0:51ac1d130fd4 22 * derived from this software without specific prior written permission.
mbed_official 0:51ac1d130fd4 23 *
mbed_official 0:51ac1d130fd4 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mbed_official 0:51ac1d130fd4 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed_official 0:51ac1d130fd4 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mbed_official 0:51ac1d130fd4 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mbed_official 0:51ac1d130fd4 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mbed_official 0:51ac1d130fd4 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed_official 0:51ac1d130fd4 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed_official 0:51ac1d130fd4 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mbed_official 0:51ac1d130fd4 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mbed_official 0:51ac1d130fd4 33 * OF SUCH DAMAGE.
mbed_official 0:51ac1d130fd4 34 *
mbed_official 0:51ac1d130fd4 35 * This file is part of the lwIP TCP/IP stack.
mbed_official 0:51ac1d130fd4 36 *
mbed_official 0:51ac1d130fd4 37 * Author: Adam Dunkels <adam@sics.se>
mbed_official 0:51ac1d130fd4 38 *
mbed_official 0:51ac1d130fd4 39 */
mbed_official 0:51ac1d130fd4 40
mbed_official 0:51ac1d130fd4 41 #include "lwip/opt.h"
mbed_official 0:51ac1d130fd4 42 #include "lwip/ip.h"
mbed_official 0:51ac1d130fd4 43 #include "lwip/def.h"
mbed_official 0:51ac1d130fd4 44 #include "lwip/mem.h"
mbed_official 0:51ac1d130fd4 45 #include "lwip/ip_frag.h"
mbed_official 0:51ac1d130fd4 46 #include "lwip/inet_chksum.h"
mbed_official 0:51ac1d130fd4 47 #include "lwip/netif.h"
mbed_official 0:51ac1d130fd4 48 #include "lwip/icmp.h"
mbed_official 0:51ac1d130fd4 49 #include "lwip/igmp.h"
mbed_official 0:51ac1d130fd4 50 #include "lwip/raw.h"
mbed_official 0:51ac1d130fd4 51 #include "lwip/udp.h"
mbed_official 0:51ac1d130fd4 52 #include "lwip/tcp_impl.h"
mbed_official 0:51ac1d130fd4 53 #include "lwip/snmp.h"
mbed_official 0:51ac1d130fd4 54 #include "lwip/dhcp.h"
mbed_official 0:51ac1d130fd4 55 #include "lwip/autoip.h"
mbed_official 0:51ac1d130fd4 56 #include "lwip/stats.h"
mbed_official 0:51ac1d130fd4 57 #include "arch/perf.h"
mbed_official 0:51ac1d130fd4 58
mbed_official 0:51ac1d130fd4 59 #include <string.h>
mbed_official 0:51ac1d130fd4 60
mbed_official 0:51ac1d130fd4 61 /** Set this to 0 in the rare case of wanting to call an extra function to
mbed_official 0:51ac1d130fd4 62 * generate the IP checksum (in contrast to calculating it on-the-fly). */
mbed_official 0:51ac1d130fd4 63 #ifndef LWIP_INLINE_IP_CHKSUM
mbed_official 0:51ac1d130fd4 64 #define LWIP_INLINE_IP_CHKSUM 1
mbed_official 0:51ac1d130fd4 65 #endif
mbed_official 0:51ac1d130fd4 66 #if LWIP_INLINE_IP_CHKSUM && CHECKSUM_GEN_IP
mbed_official 0:51ac1d130fd4 67 #define CHECKSUM_GEN_IP_INLINE 1
mbed_official 0:51ac1d130fd4 68 #else
mbed_official 0:51ac1d130fd4 69 #define CHECKSUM_GEN_IP_INLINE 0
mbed_official 0:51ac1d130fd4 70 #endif
mbed_official 0:51ac1d130fd4 71
mbed_official 0:51ac1d130fd4 72 #if LWIP_DHCP || defined(LWIP_IP_ACCEPT_UDP_PORT)
mbed_official 0:51ac1d130fd4 73 #define IP_ACCEPT_LINK_LAYER_ADDRESSING 1
mbed_official 0:51ac1d130fd4 74
mbed_official 0:51ac1d130fd4 75 /** Some defines for DHCP to let link-layer-addressed packets through while the
mbed_official 0:51ac1d130fd4 76 * netif is down.
mbed_official 0:51ac1d130fd4 77 * To use this in your own application/protocol, define LWIP_IP_ACCEPT_UDP_PORT
mbed_official 0:51ac1d130fd4 78 * to return 1 if the port is accepted and 0 if the port is not accepted.
mbed_official 0:51ac1d130fd4 79 */
mbed_official 0:51ac1d130fd4 80 #if LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT)
mbed_official 0:51ac1d130fd4 81 /* accept DHCP client port and custom port */
mbed_official 0:51ac1d130fd4 82 #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (((port) == PP_NTOHS(DHCP_CLIENT_PORT)) \
mbed_official 0:51ac1d130fd4 83 || (LWIP_IP_ACCEPT_UDP_PORT(port)))
mbed_official 0:51ac1d130fd4 84 #elif defined(LWIP_IP_ACCEPT_UDP_PORT) /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
mbed_official 0:51ac1d130fd4 85 /* accept custom port only */
mbed_official 0:51ac1d130fd4 86 #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (LWIP_IP_ACCEPT_UDP_PORT(dst_port))
mbed_official 0:51ac1d130fd4 87 #else /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
mbed_official 0:51ac1d130fd4 88 /* accept DHCP client port only */
mbed_official 0:51ac1d130fd4 89 #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) ((port) == PP_NTOHS(DHCP_CLIENT_PORT))
mbed_official 0:51ac1d130fd4 90 #endif /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
mbed_official 0:51ac1d130fd4 91
mbed_official 0:51ac1d130fd4 92 #else /* LWIP_DHCP */
mbed_official 0:51ac1d130fd4 93 #define IP_ACCEPT_LINK_LAYER_ADDRESSING 0
mbed_official 0:51ac1d130fd4 94 #endif /* LWIP_DHCP */
mbed_official 0:51ac1d130fd4 95
mbed_official 0:51ac1d130fd4 96 /**
mbed_official 0:51ac1d130fd4 97 * The interface that provided the packet for the current callback
mbed_official 0:51ac1d130fd4 98 * invocation.
mbed_official 0:51ac1d130fd4 99 */
mbed_official 0:51ac1d130fd4 100 struct netif *current_netif;
mbed_official 0:51ac1d130fd4 101
mbed_official 0:51ac1d130fd4 102 /**
mbed_official 0:51ac1d130fd4 103 * Header of the input packet currently being processed.
mbed_official 0:51ac1d130fd4 104 */
mbed_official 0:51ac1d130fd4 105 const struct ip_hdr *current_header;
mbed_official 0:51ac1d130fd4 106 /** Source IP address of current_header */
mbed_official 0:51ac1d130fd4 107 ip_addr_t current_iphdr_src;
mbed_official 0:51ac1d130fd4 108 /** Destination IP address of current_header */
mbed_official 0:51ac1d130fd4 109 ip_addr_t current_iphdr_dest;
mbed_official 0:51ac1d130fd4 110
mbed_official 0:51ac1d130fd4 111 /** The IP header ID of the next outgoing IP packet */
mbed_official 0:51ac1d130fd4 112 static u16_t ip_id;
mbed_official 0:51ac1d130fd4 113
mbed_official 0:51ac1d130fd4 114 /**
mbed_official 0:51ac1d130fd4 115 * Finds the appropriate network interface for a given IP address. It
mbed_official 0:51ac1d130fd4 116 * searches the list of network interfaces linearly. A match is found
mbed_official 0:51ac1d130fd4 117 * if the masked IP address of the network interface equals the masked
mbed_official 0:51ac1d130fd4 118 * IP address given to the function.
mbed_official 0:51ac1d130fd4 119 *
mbed_official 0:51ac1d130fd4 120 * @param dest the destination IP address for which to find the route
mbed_official 0:51ac1d130fd4 121 * @return the netif on which to send to reach dest
mbed_official 0:51ac1d130fd4 122 */
mbed_official 0:51ac1d130fd4 123 struct netif *
mbed_official 0:51ac1d130fd4 124 ip_route(ip_addr_t *dest)
mbed_official 0:51ac1d130fd4 125 {
mbed_official 0:51ac1d130fd4 126 struct netif *netif;
mbed_official 0:51ac1d130fd4 127
mbed_official 0:51ac1d130fd4 128 /* iterate through netifs */
mbed_official 0:51ac1d130fd4 129 for(netif = netif_list; netif != NULL; netif = netif->next) {
mbed_official 0:51ac1d130fd4 130 /* network mask matches? */
mbed_official 0:51ac1d130fd4 131 if (netif_is_up(netif)) {
mbed_official 0:51ac1d130fd4 132 if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
mbed_official 0:51ac1d130fd4 133 /* return netif on which to forward IP packet */
mbed_official 0:51ac1d130fd4 134 return netif;
mbed_official 0:51ac1d130fd4 135 }
mbed_official 0:51ac1d130fd4 136 }
mbed_official 0:51ac1d130fd4 137 }
mbed_official 0:51ac1d130fd4 138 if ((netif_default == NULL) || (!netif_is_up(netif_default))) {
mbed_official 0:51ac1d130fd4 139 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_route: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mbed_official 0:51ac1d130fd4 140 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
mbed_official 0:51ac1d130fd4 141 IP_STATS_INC(ip.rterr);
mbed_official 0:51ac1d130fd4 142 snmp_inc_ipoutnoroutes();
mbed_official 0:51ac1d130fd4 143 return NULL;
mbed_official 0:51ac1d130fd4 144 }
mbed_official 0:51ac1d130fd4 145 /* no matching netif found, use default netif */
mbed_official 0:51ac1d130fd4 146 return netif_default;
mbed_official 0:51ac1d130fd4 147 }
mbed_official 0:51ac1d130fd4 148
mbed_official 0:51ac1d130fd4 149 #if IP_FORWARD
mbed_official 0:51ac1d130fd4 150 /**
mbed_official 0:51ac1d130fd4 151 * Forwards an IP packet. It finds an appropriate route for the
mbed_official 0:51ac1d130fd4 152 * packet, decrements the TTL value of the packet, adjusts the
mbed_official 0:51ac1d130fd4 153 * checksum and outputs the packet on the appropriate interface.
mbed_official 0:51ac1d130fd4 154 *
mbed_official 0:51ac1d130fd4 155 * @param p the packet to forward (p->payload points to IP header)
mbed_official 0:51ac1d130fd4 156 * @param iphdr the IP header of the input packet
mbed_official 0:51ac1d130fd4 157 * @param inp the netif on which this packet was received
mbed_official 0:51ac1d130fd4 158 */
mbed_official 0:51ac1d130fd4 159 static void
mbed_official 0:51ac1d130fd4 160 ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
mbed_official 0:51ac1d130fd4 161 {
mbed_official 0:51ac1d130fd4 162 struct netif *netif;
mbed_official 0:51ac1d130fd4 163
mbed_official 0:51ac1d130fd4 164 PERF_START;
mbed_official 0:51ac1d130fd4 165
mbed_official 0:51ac1d130fd4 166 /* RFC3927 2.7: do not forward link-local addresses */
mbed_official 0:51ac1d130fd4 167 if (ip_addr_islinklocal(&current_iphdr_dest)) {
mbed_official 0:51ac1d130fd4 168 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not forwarding LLA %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mbed_official 0:51ac1d130fd4 169 ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
mbed_official 0:51ac1d130fd4 170 ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
mbed_official 0:51ac1d130fd4 171 goto return_noroute;
mbed_official 0:51ac1d130fd4 172 }
mbed_official 0:51ac1d130fd4 173
mbed_official 0:51ac1d130fd4 174 /* Find network interface where to forward this IP packet to. */
mbed_official 0:51ac1d130fd4 175 netif = ip_route(&current_iphdr_dest);
mbed_official 0:51ac1d130fd4 176 if (netif == NULL) {
mbed_official 0:51ac1d130fd4 177 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
mbed_official 0:51ac1d130fd4 178 ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
mbed_official 0:51ac1d130fd4 179 ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
mbed_official 0:51ac1d130fd4 180 goto return_noroute;
mbed_official 0:51ac1d130fd4 181 }
mbed_official 0:51ac1d130fd4 182 /* Do not forward packets onto the same network interface on which
mbed_official 0:51ac1d130fd4 183 * they arrived. */
mbed_official 0:51ac1d130fd4 184 if (netif == inp) {
mbed_official 0:51ac1d130fd4 185 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
mbed_official 0:51ac1d130fd4 186 goto return_noroute;
mbed_official 0:51ac1d130fd4 187 }
mbed_official 0:51ac1d130fd4 188
mbed_official 0:51ac1d130fd4 189 /* decrement TTL */
mbed_official 0:51ac1d130fd4 190 IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
mbed_official 0:51ac1d130fd4 191 /* send ICMP if TTL == 0 */
mbed_official 0:51ac1d130fd4 192 if (IPH_TTL(iphdr) == 0) {
mbed_official 0:51ac1d130fd4 193 snmp_inc_ipinhdrerrors();
mbed_official 0:51ac1d130fd4 194 #if LWIP_ICMP
mbed_official 0:51ac1d130fd4 195 /* Don't send ICMP messages in response to ICMP messages */
mbed_official 0:51ac1d130fd4 196 if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
mbed_official 0:51ac1d130fd4 197 icmp_time_exceeded(p, ICMP_TE_TTL);
mbed_official 0:51ac1d130fd4 198 }
mbed_official 0:51ac1d130fd4 199 #endif /* LWIP_ICMP */
mbed_official 0:51ac1d130fd4 200 return;
mbed_official 0:51ac1d130fd4 201 }
mbed_official 0:51ac1d130fd4 202
mbed_official 0:51ac1d130fd4 203 /* Incrementally update the IP checksum. */
mbed_official 0:51ac1d130fd4 204 if (IPH_CHKSUM(iphdr) >= PP_HTONS(0xffffU - 0x100)) {
mbed_official 0:51ac1d130fd4 205 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100) + 1);
mbed_official 0:51ac1d130fd4 206 } else {
mbed_official 0:51ac1d130fd4 207 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100));
mbed_official 0:51ac1d130fd4 208 }
mbed_official 0:51ac1d130fd4 209
mbed_official 0:51ac1d130fd4 210 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mbed_official 0:51ac1d130fd4 211 ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
mbed_official 0:51ac1d130fd4 212 ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
mbed_official 0:51ac1d130fd4 213
mbed_official 0:51ac1d130fd4 214 IP_STATS_INC(ip.fw);
mbed_official 0:51ac1d130fd4 215 IP_STATS_INC(ip.xmit);
mbed_official 0:51ac1d130fd4 216 snmp_inc_ipforwdatagrams();
mbed_official 0:51ac1d130fd4 217
mbed_official 0:51ac1d130fd4 218 PERF_STOP("ip_forward");
mbed_official 0:51ac1d130fd4 219 /* transmit pbuf on chosen interface */
mbed_official 0:51ac1d130fd4 220 netif->output(netif, p, &current_iphdr_dest);
mbed_official 0:51ac1d130fd4 221 return;
mbed_official 0:51ac1d130fd4 222 return_noroute:
mbed_official 0:51ac1d130fd4 223 snmp_inc_ipoutnoroutes();
mbed_official 0:51ac1d130fd4 224 }
mbed_official 0:51ac1d130fd4 225 #endif /* IP_FORWARD */
mbed_official 0:51ac1d130fd4 226
mbed_official 0:51ac1d130fd4 227 /**
mbed_official 0:51ac1d130fd4 228 * This function is called by the network interface device driver when
mbed_official 0:51ac1d130fd4 229 * an IP packet is received. The function does the basic checks of the
mbed_official 0:51ac1d130fd4 230 * IP header such as packet size being at least larger than the header
mbed_official 0:51ac1d130fd4 231 * size etc. If the packet was not destined for us, the packet is
mbed_official 0:51ac1d130fd4 232 * forwarded (using ip_forward). The IP checksum is always checked.
mbed_official 0:51ac1d130fd4 233 *
mbed_official 0:51ac1d130fd4 234 * Finally, the packet is sent to the upper layer protocol input function.
mbed_official 0:51ac1d130fd4 235 *
mbed_official 0:51ac1d130fd4 236 * @param p the received IP packet (p->payload points to IP header)
mbed_official 0:51ac1d130fd4 237 * @param inp the netif on which this packet was received
mbed_official 0:51ac1d130fd4 238 * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
mbed_official 0:51ac1d130fd4 239 * processed, but currently always returns ERR_OK)
mbed_official 0:51ac1d130fd4 240 */
mbed_official 0:51ac1d130fd4 241 err_t
mbed_official 0:51ac1d130fd4 242 ip_input(struct pbuf *p, struct netif *inp)
mbed_official 0:51ac1d130fd4 243 {
mbed_official 0:51ac1d130fd4 244 struct ip_hdr *iphdr;
mbed_official 0:51ac1d130fd4 245 struct netif *netif;
mbed_official 0:51ac1d130fd4 246 u16_t iphdr_hlen;
mbed_official 0:51ac1d130fd4 247 u16_t iphdr_len;
mbed_official 0:51ac1d130fd4 248 #if IP_ACCEPT_LINK_LAYER_ADDRESSING
mbed_official 0:51ac1d130fd4 249 int check_ip_src=1;
mbed_official 0:51ac1d130fd4 250 #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
mbed_official 0:51ac1d130fd4 251
mbed_official 0:51ac1d130fd4 252 IP_STATS_INC(ip.recv);
mbed_official 0:51ac1d130fd4 253 snmp_inc_ipinreceives();
mbed_official 0:51ac1d130fd4 254
mbed_official 0:51ac1d130fd4 255 /* identify the IP header */
mbed_official 0:51ac1d130fd4 256 iphdr = (struct ip_hdr *)p->payload;
mbed_official 0:51ac1d130fd4 257 if (IPH_V(iphdr) != 4) {
mbed_official 0:51ac1d130fd4 258 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
mbed_official 0:51ac1d130fd4 259 ip_debug_print(p);
mbed_official 0:51ac1d130fd4 260 pbuf_free(p);
mbed_official 0:51ac1d130fd4 261 IP_STATS_INC(ip.err);
mbed_official 0:51ac1d130fd4 262 IP_STATS_INC(ip.drop);
mbed_official 0:51ac1d130fd4 263 snmp_inc_ipinhdrerrors();
mbed_official 0:51ac1d130fd4 264 return ERR_OK;
mbed_official 0:51ac1d130fd4 265 }
mbed_official 0:51ac1d130fd4 266
mbed_official 0:51ac1d130fd4 267 /* obtain IP header length in number of 32-bit words */
mbed_official 0:51ac1d130fd4 268 iphdr_hlen = IPH_HL(iphdr);
mbed_official 0:51ac1d130fd4 269 /* calculate IP header length in bytes */
mbed_official 0:51ac1d130fd4 270 iphdr_hlen *= 4;
mbed_official 0:51ac1d130fd4 271 /* obtain ip length in bytes */
mbed_official 0:51ac1d130fd4 272 iphdr_len = ntohs(IPH_LEN(iphdr));
mbed_official 0:51ac1d130fd4 273
mbed_official 0:51ac1d130fd4 274 /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
mbed_official 0:51ac1d130fd4 275 if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len)) {
mbed_official 0:51ac1d130fd4 276 if (iphdr_hlen > p->len) {
mbed_official 0:51ac1d130fd4 277 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
mbed_official 0:51ac1d130fd4 278 ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
mbed_official 0:51ac1d130fd4 279 iphdr_hlen, p->len));
mbed_official 0:51ac1d130fd4 280 }
mbed_official 0:51ac1d130fd4 281 if (iphdr_len > p->tot_len) {
mbed_official 0:51ac1d130fd4 282 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
mbed_official 0:51ac1d130fd4 283 ("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
mbed_official 0:51ac1d130fd4 284 iphdr_len, p->tot_len));
mbed_official 0:51ac1d130fd4 285 }
mbed_official 0:51ac1d130fd4 286 /* free (drop) packet pbufs */
mbed_official 0:51ac1d130fd4 287 pbuf_free(p);
mbed_official 0:51ac1d130fd4 288 IP_STATS_INC(ip.lenerr);
mbed_official 0:51ac1d130fd4 289 IP_STATS_INC(ip.drop);
mbed_official 0:51ac1d130fd4 290 snmp_inc_ipindiscards();
mbed_official 0:51ac1d130fd4 291 return ERR_OK;
mbed_official 0:51ac1d130fd4 292 }
mbed_official 0:51ac1d130fd4 293
mbed_official 0:51ac1d130fd4 294 /* verify checksum */
mbed_official 0:51ac1d130fd4 295 #if CHECKSUM_CHECK_IP
mbed_official 0:51ac1d130fd4 296 if (inet_chksum(iphdr, iphdr_hlen) != 0) {
mbed_official 0:51ac1d130fd4 297
mbed_official 0:51ac1d130fd4 298 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
mbed_official 0:51ac1d130fd4 299 ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
mbed_official 0:51ac1d130fd4 300 ip_debug_print(p);
mbed_official 0:51ac1d130fd4 301 pbuf_free(p);
mbed_official 0:51ac1d130fd4 302 IP_STATS_INC(ip.chkerr);
mbed_official 0:51ac1d130fd4 303 IP_STATS_INC(ip.drop);
mbed_official 0:51ac1d130fd4 304 snmp_inc_ipinhdrerrors();
mbed_official 0:51ac1d130fd4 305 return ERR_OK;
mbed_official 0:51ac1d130fd4 306 }
mbed_official 0:51ac1d130fd4 307 #endif
mbed_official 0:51ac1d130fd4 308
mbed_official 0:51ac1d130fd4 309 /* Trim pbuf. This should have been done at the netif layer,
mbed_official 0:51ac1d130fd4 310 * but we'll do it anyway just to be sure that its done. */
mbed_official 0:51ac1d130fd4 311 pbuf_realloc(p, iphdr_len);
mbed_official 0:51ac1d130fd4 312
mbed_official 0:51ac1d130fd4 313 /* copy IP addresses to aligned ip_addr_t */
mbed_official 0:51ac1d130fd4 314 ip_addr_copy(current_iphdr_dest, iphdr->dest);
mbed_official 0:51ac1d130fd4 315 ip_addr_copy(current_iphdr_src, iphdr->src);
mbed_official 0:51ac1d130fd4 316
mbed_official 0:51ac1d130fd4 317 /* match packet against an interface, i.e. is this packet for us? */
mbed_official 0:51ac1d130fd4 318 #if LWIP_IGMP
mbed_official 0:51ac1d130fd4 319 if (ip_addr_ismulticast(&current_iphdr_dest)) {
mbed_official 0:51ac1d130fd4 320 if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &current_iphdr_dest))) {
mbed_official 0:51ac1d130fd4 321 netif = inp;
mbed_official 0:51ac1d130fd4 322 } else {
mbed_official 0:51ac1d130fd4 323 netif = NULL;
mbed_official 0:51ac1d130fd4 324 }
mbed_official 0:51ac1d130fd4 325 } else
mbed_official 0:51ac1d130fd4 326 #endif /* LWIP_IGMP */
mbed_official 0:51ac1d130fd4 327 {
mbed_official 0:51ac1d130fd4 328 /* start trying with inp. if that's not acceptable, start walking the
mbed_official 0:51ac1d130fd4 329 list of configured netifs.
mbed_official 0:51ac1d130fd4 330 'first' is used as a boolean to mark whether we started walking the list */
mbed_official 0:51ac1d130fd4 331 int first = 1;
mbed_official 0:51ac1d130fd4 332 netif = inp;
mbed_official 0:51ac1d130fd4 333 do {
mbed_official 0:51ac1d130fd4 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",
mbed_official 0:51ac1d130fd4 335 ip4_addr_get_u32(&iphdr->dest), ip4_addr_get_u32(&netif->ip_addr),
mbed_official 0:51ac1d130fd4 336 ip4_addr_get_u32(&iphdr->dest) & ip4_addr_get_u32(&netif->netmask),
mbed_official 0:51ac1d130fd4 337 ip4_addr_get_u32(&netif->ip_addr) & ip4_addr_get_u32(&netif->netmask),
mbed_official 0:51ac1d130fd4 338 ip4_addr_get_u32(&iphdr->dest) & ~ip4_addr_get_u32(&netif->netmask)));
mbed_official 0:51ac1d130fd4 339
mbed_official 0:51ac1d130fd4 340 /* interface is up and configured? */
mbed_official 0:51ac1d130fd4 341 if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
mbed_official 0:51ac1d130fd4 342 /* unicast to this interface address? */
mbed_official 0:51ac1d130fd4 343 if (ip_addr_cmp(&current_iphdr_dest, &(netif->ip_addr)) ||
mbed_official 0:51ac1d130fd4 344 /* or broadcast on this interface network address? */
mbed_official 0:51ac1d130fd4 345 ip_addr_isbroadcast(&current_iphdr_dest, netif)) {
mbed_official 0:51ac1d130fd4 346 LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
mbed_official 0:51ac1d130fd4 347 netif->name[0], netif->name[1]));
mbed_official 0:51ac1d130fd4 348 /* break out of for loop */
mbed_official 0:51ac1d130fd4 349 break;
mbed_official 0:51ac1d130fd4 350 }
mbed_official 0:51ac1d130fd4 351 #if LWIP_AUTOIP
mbed_official 0:51ac1d130fd4 352 /* connections to link-local addresses must persist after changing
mbed_official 0:51ac1d130fd4 353 the netif's address (RFC3927 ch. 1.9) */
mbed_official 0:51ac1d130fd4 354 if ((netif->autoip != NULL) &&
mbed_official 0:51ac1d130fd4 355 ip_addr_cmp(&current_iphdr_dest, &(netif->autoip->llipaddr))) {
mbed_official 0:51ac1d130fd4 356 LWIP_DEBUGF(IP_DEBUG, ("ip_input: LLA packet accepted on interface %c%c\n",
mbed_official 0:51ac1d130fd4 357 netif->name[0], netif->name[1]));
mbed_official 0:51ac1d130fd4 358 /* break out of for loop */
mbed_official 0:51ac1d130fd4 359 break;
mbed_official 0:51ac1d130fd4 360 }
mbed_official 0:51ac1d130fd4 361 #endif /* LWIP_AUTOIP */
mbed_official 0:51ac1d130fd4 362 }
mbed_official 0:51ac1d130fd4 363 if (first) {
mbed_official 0:51ac1d130fd4 364 first = 0;
mbed_official 0:51ac1d130fd4 365 netif = netif_list;
mbed_official 0:51ac1d130fd4 366 } else {
mbed_official 0:51ac1d130fd4 367 netif = netif->next;
mbed_official 0:51ac1d130fd4 368 }
mbed_official 0:51ac1d130fd4 369 if (netif == inp) {
mbed_official 0:51ac1d130fd4 370 netif = netif->next;
mbed_official 0:51ac1d130fd4 371 }
mbed_official 0:51ac1d130fd4 372 } while(netif != NULL);
mbed_official 0:51ac1d130fd4 373 }
mbed_official 0:51ac1d130fd4 374
mbed_official 0:51ac1d130fd4 375 #if IP_ACCEPT_LINK_LAYER_ADDRESSING
mbed_official 0:51ac1d130fd4 376 /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
mbed_official 0:51ac1d130fd4 377 * using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
mbed_official 0:51ac1d130fd4 378 * According to RFC 1542 section 3.1.1, referred by RFC 2131).
mbed_official 0:51ac1d130fd4 379 *
mbed_official 0:51ac1d130fd4 380 * If you want to accept private broadcast communication while a netif is down,
mbed_official 0:51ac1d130fd4 381 * define LWIP_IP_ACCEPT_UDP_PORT(dst_port), e.g.:
mbed_official 0:51ac1d130fd4 382 *
mbed_official 0:51ac1d130fd4 383 * #define LWIP_IP_ACCEPT_UDP_PORT(dst_port) ((dst_port) == PP_NTOHS(12345))
mbed_official 0:51ac1d130fd4 384 */
mbed_official 0:51ac1d130fd4 385 if (netif == NULL) {
mbed_official 0:51ac1d130fd4 386 /* remote port is DHCP server? */
mbed_official 0:51ac1d130fd4 387 if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
mbed_official 0:51ac1d130fd4 388 struct udp_hdr *udphdr = (struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen);
mbed_official 0:51ac1d130fd4 389 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
mbed_official 0:51ac1d130fd4 390 ntohs(udphdr->dest)));
mbed_official 0:51ac1d130fd4 391 if (IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(udphdr->dest)) {
mbed_official 0:51ac1d130fd4 392 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: DHCP packet accepted.\n"));
mbed_official 0:51ac1d130fd4 393 netif = inp;
mbed_official 0:51ac1d130fd4 394 check_ip_src = 0;
mbed_official 0:51ac1d130fd4 395 }
mbed_official 0:51ac1d130fd4 396 }
mbed_official 0:51ac1d130fd4 397 }
mbed_official 0:51ac1d130fd4 398 #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
mbed_official 0:51ac1d130fd4 399
mbed_official 0:51ac1d130fd4 400 /* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
mbed_official 0:51ac1d130fd4 401 #if IP_ACCEPT_LINK_LAYER_ADDRESSING
mbed_official 0:51ac1d130fd4 402 /* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
bogdanm 11:4b3f6f8b92d2 403 if (check_ip_src && current_iphdr_src.addr != IPADDR_ANY)
mbed_official 0:51ac1d130fd4 404 #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
mbed_official 0:51ac1d130fd4 405 { if ((ip_addr_isbroadcast(&current_iphdr_src, inp)) ||
mbed_official 0:51ac1d130fd4 406 (ip_addr_ismulticast(&current_iphdr_src))) {
mbed_official 0:51ac1d130fd4 407 /* packet source is not valid */
mbed_official 0:51ac1d130fd4 408 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("ip_input: packet source is not valid.\n"));
mbed_official 0:51ac1d130fd4 409 /* free (drop) packet pbufs */
mbed_official 0:51ac1d130fd4 410 pbuf_free(p);
mbed_official 0:51ac1d130fd4 411 IP_STATS_INC(ip.drop);
mbed_official 0:51ac1d130fd4 412 snmp_inc_ipinaddrerrors();
mbed_official 0:51ac1d130fd4 413 snmp_inc_ipindiscards();
mbed_official 0:51ac1d130fd4 414 return ERR_OK;
mbed_official 0:51ac1d130fd4 415 }
mbed_official 0:51ac1d130fd4 416 }
mbed_official 0:51ac1d130fd4 417
mbed_official 0:51ac1d130fd4 418 /* packet not for us? */
mbed_official 0:51ac1d130fd4 419 if (netif == NULL) {
mbed_official 0:51ac1d130fd4 420 /* packet not for us, route or discard */
mbed_official 0:51ac1d130fd4 421 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: packet not for us.\n"));
mbed_official 0:51ac1d130fd4 422 #if IP_FORWARD
mbed_official 0:51ac1d130fd4 423 /* non-broadcast packet? */
mbed_official 0:51ac1d130fd4 424 if (!ip_addr_isbroadcast(&current_iphdr_dest, inp)) {
mbed_official 0:51ac1d130fd4 425 /* try to forward IP packet on (other) interfaces */
mbed_official 0:51ac1d130fd4 426 ip_forward(p, iphdr, inp);
mbed_official 0:51ac1d130fd4 427 } else
mbed_official 0:51ac1d130fd4 428 #endif /* IP_FORWARD */
mbed_official 0:51ac1d130fd4 429 {
mbed_official 0:51ac1d130fd4 430 snmp_inc_ipinaddrerrors();
mbed_official 0:51ac1d130fd4 431 snmp_inc_ipindiscards();
mbed_official 0:51ac1d130fd4 432 }
mbed_official 0:51ac1d130fd4 433 pbuf_free(p);
mbed_official 0:51ac1d130fd4 434 return ERR_OK;
mbed_official 0:51ac1d130fd4 435 }
mbed_official 0:51ac1d130fd4 436 /* packet consists of multiple fragments? */
mbed_official 0:51ac1d130fd4 437 if ((IPH_OFFSET(iphdr) & PP_HTONS(IP_OFFMASK | IP_MF)) != 0) {
mbed_official 0:51ac1d130fd4 438 #if IP_REASSEMBLY /* packet fragment reassembly code present? */
mbed_official 0:51ac1d130fd4 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",
mbed_official 0:51ac1d130fd4 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));
mbed_official 0:51ac1d130fd4 441 /* reassemble the packet*/
mbed_official 0:51ac1d130fd4 442 p = ip_reass(p);
mbed_official 0:51ac1d130fd4 443 /* packet not fully reassembled yet? */
mbed_official 0:51ac1d130fd4 444 if (p == NULL) {
mbed_official 0:51ac1d130fd4 445 return ERR_OK;
mbed_official 0:51ac1d130fd4 446 }
mbed_official 0:51ac1d130fd4 447 iphdr = (struct ip_hdr *)p->payload;
mbed_official 0:51ac1d130fd4 448 #else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
mbed_official 0:51ac1d130fd4 449 pbuf_free(p);
mbed_official 0:51ac1d130fd4 450 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
mbed_official 0:51ac1d130fd4 451 ntohs(IPH_OFFSET(iphdr))));
mbed_official 0:51ac1d130fd4 452 IP_STATS_INC(ip.opterr);
mbed_official 0:51ac1d130fd4 453 IP_STATS_INC(ip.drop);
mbed_official 0:51ac1d130fd4 454 /* unsupported protocol feature */
mbed_official 0:51ac1d130fd4 455 snmp_inc_ipinunknownprotos();
mbed_official 0:51ac1d130fd4 456 return ERR_OK;
mbed_official 0:51ac1d130fd4 457 #endif /* IP_REASSEMBLY */
mbed_official 0:51ac1d130fd4 458 }
mbed_official 0:51ac1d130fd4 459
mbed_official 0:51ac1d130fd4 460 #if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
mbed_official 0:51ac1d130fd4 461
mbed_official 0:51ac1d130fd4 462 #if LWIP_IGMP
mbed_official 0:51ac1d130fd4 463 /* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
mbed_official 0:51ac1d130fd4 464 if((iphdr_hlen > IP_HLEN) && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
mbed_official 0:51ac1d130fd4 465 #else
mbed_official 0:51ac1d130fd4 466 if (iphdr_hlen > IP_HLEN) {
mbed_official 0:51ac1d130fd4 467 #endif /* LWIP_IGMP */
mbed_official 0:51ac1d130fd4 468 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
mbed_official 0:51ac1d130fd4 469 pbuf_free(p);
mbed_official 0:51ac1d130fd4 470 IP_STATS_INC(ip.opterr);
mbed_official 0:51ac1d130fd4 471 IP_STATS_INC(ip.drop);
mbed_official 0:51ac1d130fd4 472 /* unsupported protocol feature */
mbed_official 0:51ac1d130fd4 473 snmp_inc_ipinunknownprotos();
mbed_official 0:51ac1d130fd4 474 return ERR_OK;
mbed_official 0:51ac1d130fd4 475 }
mbed_official 0:51ac1d130fd4 476 #endif /* IP_OPTIONS_ALLOWED == 0 */
mbed_official 0:51ac1d130fd4 477
mbed_official 0:51ac1d130fd4 478 /* send to upper layers */
mbed_official 0:51ac1d130fd4 479 LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
mbed_official 0:51ac1d130fd4 480 ip_debug_print(p);
mbed_official 0:51ac1d130fd4 481 LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
mbed_official 0:51ac1d130fd4 482
mbed_official 0:51ac1d130fd4 483 current_netif = inp;
mbed_official 0:51ac1d130fd4 484 current_header = iphdr;
mbed_official 0:51ac1d130fd4 485
mbed_official 0:51ac1d130fd4 486 #if LWIP_RAW
mbed_official 0:51ac1d130fd4 487 /* raw input did not eat the packet? */
mbed_official 0:51ac1d130fd4 488 if (raw_input(p, inp) == 0)
mbed_official 0:51ac1d130fd4 489 #endif /* LWIP_RAW */
mbed_official 0:51ac1d130fd4 490 {
mbed_official 0:51ac1d130fd4 491
mbed_official 0:51ac1d130fd4 492 switch (IPH_PROTO(iphdr)) {
mbed_official 0:51ac1d130fd4 493 #if LWIP_UDP
mbed_official 0:51ac1d130fd4 494 case IP_PROTO_UDP:
mbed_official 0:51ac1d130fd4 495 #if LWIP_UDPLITE
mbed_official 0:51ac1d130fd4 496 case IP_PROTO_UDPLITE:
mbed_official 0:51ac1d130fd4 497 #endif /* LWIP_UDPLITE */
mbed_official 0:51ac1d130fd4 498 snmp_inc_ipindelivers();
mbed_official 0:51ac1d130fd4 499 udp_input(p, inp);
mbed_official 0:51ac1d130fd4 500 break;
mbed_official 0:51ac1d130fd4 501 #endif /* LWIP_UDP */
mbed_official 0:51ac1d130fd4 502 #if LWIP_TCP
mbed_official 0:51ac1d130fd4 503 case IP_PROTO_TCP:
mbed_official 0:51ac1d130fd4 504 snmp_inc_ipindelivers();
mbed_official 0:51ac1d130fd4 505 tcp_input(p, inp);
mbed_official 0:51ac1d130fd4 506 break;
mbed_official 0:51ac1d130fd4 507 #endif /* LWIP_TCP */
mbed_official 0:51ac1d130fd4 508 #if LWIP_ICMP
mbed_official 0:51ac1d130fd4 509 case IP_PROTO_ICMP:
mbed_official 0:51ac1d130fd4 510 snmp_inc_ipindelivers();
mbed_official 0:51ac1d130fd4 511 icmp_input(p, inp);
mbed_official 0:51ac1d130fd4 512 break;
mbed_official 0:51ac1d130fd4 513 #endif /* LWIP_ICMP */
mbed_official 0:51ac1d130fd4 514 #if LWIP_IGMP
mbed_official 0:51ac1d130fd4 515 case IP_PROTO_IGMP:
mbed_official 0:51ac1d130fd4 516 igmp_input(p, inp, &current_iphdr_dest);
mbed_official 0:51ac1d130fd4 517 break;
mbed_official 0:51ac1d130fd4 518 #endif /* LWIP_IGMP */
mbed_official 0:51ac1d130fd4 519 default:
mbed_official 0:51ac1d130fd4 520 #if LWIP_ICMP
mbed_official 0:51ac1d130fd4 521 /* send ICMP destination protocol unreachable unless is was a broadcast */
mbed_official 0:51ac1d130fd4 522 if (!ip_addr_isbroadcast(&current_iphdr_dest, inp) &&
mbed_official 0:51ac1d130fd4 523 !ip_addr_ismulticast(&current_iphdr_dest)) {
mbed_official 0:51ac1d130fd4 524 p->payload = iphdr;
mbed_official 0:51ac1d130fd4 525 icmp_dest_unreach(p, ICMP_DUR_PROTO);
mbed_official 0:51ac1d130fd4 526 }
mbed_official 0:51ac1d130fd4 527 #endif /* LWIP_ICMP */
mbed_official 0:51ac1d130fd4 528 pbuf_free(p);
mbed_official 0:51ac1d130fd4 529
mbed_official 0:51ac1d130fd4 530 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
mbed_official 0:51ac1d130fd4 531
mbed_official 0:51ac1d130fd4 532 IP_STATS_INC(ip.proterr);
mbed_official 0:51ac1d130fd4 533 IP_STATS_INC(ip.drop);
mbed_official 0:51ac1d130fd4 534 snmp_inc_ipinunknownprotos();
mbed_official 0:51ac1d130fd4 535 }
mbed_official 0:51ac1d130fd4 536 }
mbed_official 0:51ac1d130fd4 537
mbed_official 0:51ac1d130fd4 538 current_netif = NULL;
mbed_official 0:51ac1d130fd4 539 current_header = NULL;
mbed_official 0:51ac1d130fd4 540 ip_addr_set_any(&current_iphdr_src);
mbed_official 0:51ac1d130fd4 541 ip_addr_set_any(&current_iphdr_dest);
mbed_official 0:51ac1d130fd4 542
mbed_official 0:51ac1d130fd4 543 return ERR_OK;
mbed_official 0:51ac1d130fd4 544 }
mbed_official 0:51ac1d130fd4 545
mbed_official 0:51ac1d130fd4 546 /**
mbed_official 0:51ac1d130fd4 547 * Sends an IP packet on a network interface. This function constructs
mbed_official 0:51ac1d130fd4 548 * the IP header and calculates the IP header checksum. If the source
mbed_official 0:51ac1d130fd4 549 * IP address is NULL, the IP address of the outgoing network
mbed_official 0:51ac1d130fd4 550 * interface is filled in as source address.
mbed_official 0:51ac1d130fd4 551 * If the destination IP address is IP_HDRINCL, p is assumed to already
mbed_official 0:51ac1d130fd4 552 * include an IP header and p->payload points to it instead of the data.
mbed_official 0:51ac1d130fd4 553 *
mbed_official 0:51ac1d130fd4 554 * @param p the packet to send (p->payload points to the data, e.g. next
mbed_official 0:51ac1d130fd4 555 protocol header; if dest == IP_HDRINCL, p already includes an IP
mbed_official 0:51ac1d130fd4 556 header and p->payload points to that IP header)
mbed_official 0:51ac1d130fd4 557 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
mbed_official 0:51ac1d130fd4 558 * IP address of the netif used to send is used as source address)
mbed_official 0:51ac1d130fd4 559 * @param dest the destination IP address to send the packet to
mbed_official 0:51ac1d130fd4 560 * @param ttl the TTL value to be set in the IP header
mbed_official 0:51ac1d130fd4 561 * @param tos the TOS value to be set in the IP header
mbed_official 0:51ac1d130fd4 562 * @param proto the PROTOCOL to be set in the IP header
mbed_official 0:51ac1d130fd4 563 * @param netif the netif on which to send this packet
mbed_official 0:51ac1d130fd4 564 * @return ERR_OK if the packet was sent OK
mbed_official 0:51ac1d130fd4 565 * ERR_BUF if p doesn't have enough space for IP/LINK headers
mbed_official 0:51ac1d130fd4 566 * returns errors returned by netif->output
mbed_official 0:51ac1d130fd4 567 *
mbed_official 0:51ac1d130fd4 568 * @note ip_id: RFC791 "some host may be able to simply use
mbed_official 0:51ac1d130fd4 569 * unique identifiers independent of destination"
mbed_official 0:51ac1d130fd4 570 */
mbed_official 0:51ac1d130fd4 571 err_t
mbed_official 0:51ac1d130fd4 572 ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
mbed_official 0:51ac1d130fd4 573 u8_t ttl, u8_t tos,
mbed_official 0:51ac1d130fd4 574 u8_t proto, struct netif *netif)
mbed_official 0:51ac1d130fd4 575 {
mbed_official 0:51ac1d130fd4 576 #if IP_OPTIONS_SEND
mbed_official 0:51ac1d130fd4 577 return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
mbed_official 0:51ac1d130fd4 578 }
mbed_official 0:51ac1d130fd4 579
mbed_official 0:51ac1d130fd4 580 /**
mbed_official 0:51ac1d130fd4 581 * Same as ip_output_if() but with the possibility to include IP options:
mbed_official 0:51ac1d130fd4 582 *
mbed_official 0:51ac1d130fd4 583 * @ param ip_options pointer to the IP options, copied into the IP header
mbed_official 0:51ac1d130fd4 584 * @ param optlen length of ip_options
mbed_official 0:51ac1d130fd4 585 */
mbed_official 0:51ac1d130fd4 586 err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
mbed_official 0:51ac1d130fd4 587 u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
mbed_official 0:51ac1d130fd4 588 u16_t optlen)
mbed_official 0:51ac1d130fd4 589 {
mbed_official 0:51ac1d130fd4 590 #endif /* IP_OPTIONS_SEND */
mbed_official 0:51ac1d130fd4 591 struct ip_hdr *iphdr;
mbed_official 0:51ac1d130fd4 592 ip_addr_t dest_addr;
mbed_official 0:51ac1d130fd4 593 #if CHECKSUM_GEN_IP_INLINE
mbed_official 0:51ac1d130fd4 594 u32_t chk_sum = 0;
mbed_official 0:51ac1d130fd4 595 #endif /* CHECKSUM_GEN_IP_INLINE */
mbed_official 0:51ac1d130fd4 596
mbed_official 0:51ac1d130fd4 597 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
mbed_official 0:51ac1d130fd4 598 gets altered as the packet is passed down the stack */
mbed_official 0:51ac1d130fd4 599 LWIP_ASSERT("p->ref == 1", p->ref == 1);
mbed_official 0:51ac1d130fd4 600
mbed_official 0:51ac1d130fd4 601 snmp_inc_ipoutrequests();
mbed_official 0:51ac1d130fd4 602
mbed_official 0:51ac1d130fd4 603 /* Should the IP header be generated or is it already included in p? */
mbed_official 0:51ac1d130fd4 604 if (dest != IP_HDRINCL) {
mbed_official 0:51ac1d130fd4 605 u16_t ip_hlen = IP_HLEN;
mbed_official 0:51ac1d130fd4 606 #if IP_OPTIONS_SEND
mbed_official 0:51ac1d130fd4 607 u16_t optlen_aligned = 0;
mbed_official 0:51ac1d130fd4 608 if (optlen != 0) {
mbed_official 0:51ac1d130fd4 609 #if CHECKSUM_GEN_IP_INLINE
mbed_official 0:51ac1d130fd4 610 int i;
mbed_official 0:51ac1d130fd4 611 #endif /* CHECKSUM_GEN_IP_INLINE */
mbed_official 0:51ac1d130fd4 612 /* round up to a multiple of 4 */
mbed_official 0:51ac1d130fd4 613 optlen_aligned = ((optlen + 3) & ~3);
mbed_official 0:51ac1d130fd4 614 ip_hlen += optlen_aligned;
mbed_official 0:51ac1d130fd4 615 /* First write in the IP options */
mbed_official 0:51ac1d130fd4 616 if (pbuf_header(p, optlen_aligned)) {
mbed_official 0:51ac1d130fd4 617 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
mbed_official 0:51ac1d130fd4 618 IP_STATS_INC(ip.err);
mbed_official 0:51ac1d130fd4 619 snmp_inc_ipoutdiscards();
mbed_official 0:51ac1d130fd4 620 return ERR_BUF;
mbed_official 0:51ac1d130fd4 621 }
mbed_official 0:51ac1d130fd4 622 MEMCPY(p->payload, ip_options, optlen);
mbed_official 0:51ac1d130fd4 623 if (optlen < optlen_aligned) {
mbed_official 0:51ac1d130fd4 624 /* zero the remaining bytes */
mbed_official 0:51ac1d130fd4 625 memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
mbed_official 0:51ac1d130fd4 626 }
mbed_official 0:51ac1d130fd4 627 #if CHECKSUM_GEN_IP_INLINE
mbed_official 0:51ac1d130fd4 628 for (i = 0; i < optlen_aligned/2; i++) {
mbed_official 0:51ac1d130fd4 629 chk_sum += ((u16_t*)p->payload)[i];
mbed_official 0:51ac1d130fd4 630 }
mbed_official 0:51ac1d130fd4 631 #endif /* CHECKSUM_GEN_IP_INLINE */
mbed_official 0:51ac1d130fd4 632 }
mbed_official 0:51ac1d130fd4 633 #endif /* IP_OPTIONS_SEND */
mbed_official 0:51ac1d130fd4 634 /* generate IP header */
mbed_official 0:51ac1d130fd4 635 if (pbuf_header(p, IP_HLEN)) {
mbed_official 0:51ac1d130fd4 636 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output: not enough room for IP header in pbuf\n"));
mbed_official 0:51ac1d130fd4 637
mbed_official 0:51ac1d130fd4 638 IP_STATS_INC(ip.err);
mbed_official 0:51ac1d130fd4 639 snmp_inc_ipoutdiscards();
mbed_official 0:51ac1d130fd4 640 return ERR_BUF;
mbed_official 0:51ac1d130fd4 641 }
mbed_official 0:51ac1d130fd4 642
mbed_official 0:51ac1d130fd4 643 iphdr = (struct ip_hdr *)p->payload;
mbed_official 0:51ac1d130fd4 644 LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
mbed_official 0:51ac1d130fd4 645 (p->len >= sizeof(struct ip_hdr)));
mbed_official 0:51ac1d130fd4 646
mbed_official 0:51ac1d130fd4 647 IPH_TTL_SET(iphdr, ttl);
mbed_official 0:51ac1d130fd4 648 IPH_PROTO_SET(iphdr, proto);
mbed_official 0:51ac1d130fd4 649 #if CHECKSUM_GEN_IP_INLINE
mbed_official 0:51ac1d130fd4 650 chk_sum += LWIP_MAKE_U16(proto, ttl);
mbed_official 0:51ac1d130fd4 651 #endif /* CHECKSUM_GEN_IP_INLINE */
mbed_official 0:51ac1d130fd4 652
mbed_official 0:51ac1d130fd4 653 /* dest cannot be NULL here */
mbed_official 0:51ac1d130fd4 654 ip_addr_copy(iphdr->dest, *dest);
mbed_official 0:51ac1d130fd4 655 #if CHECKSUM_GEN_IP_INLINE
mbed_official 0:51ac1d130fd4 656 chk_sum += ip4_addr_get_u32(&iphdr->dest) & 0xFFFF;
mbed_official 0:51ac1d130fd4 657 chk_sum += ip4_addr_get_u32(&iphdr->dest) >> 16;
mbed_official 0:51ac1d130fd4 658 #endif /* CHECKSUM_GEN_IP_INLINE */
mbed_official 0:51ac1d130fd4 659
mbed_official 0:51ac1d130fd4 660 IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
mbed_official 0:51ac1d130fd4 661 #if CHECKSUM_GEN_IP_INLINE
mbed_official 0:51ac1d130fd4 662 chk_sum += iphdr->_v_hl_tos;
mbed_official 0:51ac1d130fd4 663 #endif /* CHECKSUM_GEN_IP_INLINE */
mbed_official 0:51ac1d130fd4 664 IPH_LEN_SET(iphdr, htons(p->tot_len));
mbed_official 0:51ac1d130fd4 665 #if CHECKSUM_GEN_IP_INLINE
mbed_official 0:51ac1d130fd4 666 chk_sum += iphdr->_len;
mbed_official 0:51ac1d130fd4 667 #endif /* CHECKSUM_GEN_IP_INLINE */
mbed_official 0:51ac1d130fd4 668 IPH_OFFSET_SET(iphdr, 0);
mbed_official 0:51ac1d130fd4 669 IPH_ID_SET(iphdr, htons(ip_id));
mbed_official 0:51ac1d130fd4 670 #if CHECKSUM_GEN_IP_INLINE
mbed_official 0:51ac1d130fd4 671 chk_sum += iphdr->_id;
mbed_official 0:51ac1d130fd4 672 #endif /* CHECKSUM_GEN_IP_INLINE */
mbed_official 0:51ac1d130fd4 673 ++ip_id;
mbed_official 0:51ac1d130fd4 674
mbed_official 0:51ac1d130fd4 675 if (ip_addr_isany(src)) {
mbed_official 0:51ac1d130fd4 676 ip_addr_copy(iphdr->src, netif->ip_addr);
mbed_official 0:51ac1d130fd4 677 } else {
mbed_official 0:51ac1d130fd4 678 /* src cannot be NULL here */
mbed_official 0:51ac1d130fd4 679 ip_addr_copy(iphdr->src, *src);
mbed_official 0:51ac1d130fd4 680 }
mbed_official 0:51ac1d130fd4 681
mbed_official 0:51ac1d130fd4 682 #if CHECKSUM_GEN_IP_INLINE
mbed_official 0:51ac1d130fd4 683 chk_sum += ip4_addr_get_u32(&iphdr->src) & 0xFFFF;
mbed_official 0:51ac1d130fd4 684 chk_sum += ip4_addr_get_u32(&iphdr->src) >> 16;
mbed_official 0:51ac1d130fd4 685 chk_sum = (chk_sum >> 16) + (chk_sum & 0xFFFF);
mbed_official 0:51ac1d130fd4 686 chk_sum = (chk_sum >> 16) + chk_sum;
mbed_official 0:51ac1d130fd4 687 chk_sum = ~chk_sum;
mbed_official 0:51ac1d130fd4 688 iphdr->_chksum = chk_sum; /* network order */
mbed_official 0:51ac1d130fd4 689 #else /* CHECKSUM_GEN_IP_INLINE */
mbed_official 0:51ac1d130fd4 690 IPH_CHKSUM_SET(iphdr, 0);
mbed_official 0:51ac1d130fd4 691 #if CHECKSUM_GEN_IP
mbed_official 0:51ac1d130fd4 692 IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
mbed_official 0:51ac1d130fd4 693 #endif
mbed_official 0:51ac1d130fd4 694 #endif /* CHECKSUM_GEN_IP_INLINE */
mbed_official 0:51ac1d130fd4 695 } else {
mbed_official 0:51ac1d130fd4 696 /* IP header already included in p */
mbed_official 0:51ac1d130fd4 697 iphdr = (struct ip_hdr *)p->payload;
mbed_official 0:51ac1d130fd4 698 ip_addr_copy(dest_addr, iphdr->dest);
mbed_official 0:51ac1d130fd4 699 dest = &dest_addr;
mbed_official 0:51ac1d130fd4 700 }
mbed_official 0:51ac1d130fd4 701
mbed_official 0:51ac1d130fd4 702 IP_STATS_INC(ip.xmit);
mbed_official 0:51ac1d130fd4 703
mbed_official 0:51ac1d130fd4 704 LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
mbed_official 0:51ac1d130fd4 705 ip_debug_print(p);
mbed_official 0:51ac1d130fd4 706
mbed_official 0:51ac1d130fd4 707 #if ENABLE_LOOPBACK
mbed_official 0:51ac1d130fd4 708 if (ip_addr_cmp(dest, &netif->ip_addr)) {
mbed_official 0:51ac1d130fd4 709 /* Packet to self, enqueue it for loopback */
mbed_official 0:51ac1d130fd4 710 LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
mbed_official 0:51ac1d130fd4 711 return netif_loop_output(netif, p, dest);
mbed_official 0:51ac1d130fd4 712 }
mbed_official 0:51ac1d130fd4 713 #if LWIP_IGMP
mbed_official 0:51ac1d130fd4 714 if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) {
mbed_official 0:51ac1d130fd4 715 netif_loop_output(netif, p, dest);
mbed_official 0:51ac1d130fd4 716 }
mbed_official 0:51ac1d130fd4 717 #endif /* LWIP_IGMP */
mbed_official 0:51ac1d130fd4 718 #endif /* ENABLE_LOOPBACK */
mbed_official 0:51ac1d130fd4 719 #if IP_FRAG
mbed_official 0:51ac1d130fd4 720 /* don't fragment if interface has mtu set to 0 [loopif] */
mbed_official 0:51ac1d130fd4 721 if (netif->mtu && (p->tot_len > netif->mtu)) {
mbed_official 0:51ac1d130fd4 722 return ip_frag(p, netif, dest);
mbed_official 0:51ac1d130fd4 723 }
mbed_official 0:51ac1d130fd4 724 #endif /* IP_FRAG */
mbed_official 0:51ac1d130fd4 725
mbed_official 0:51ac1d130fd4 726 LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
mbed_official 0:51ac1d130fd4 727 return netif->output(netif, p, dest);
mbed_official 0:51ac1d130fd4 728 }
mbed_official 0:51ac1d130fd4 729
mbed_official 0:51ac1d130fd4 730 /**
mbed_official 0:51ac1d130fd4 731 * Simple interface to ip_output_if. It finds the outgoing network
mbed_official 0:51ac1d130fd4 732 * interface and calls upon ip_output_if to do the actual work.
mbed_official 0:51ac1d130fd4 733 *
mbed_official 0:51ac1d130fd4 734 * @param p the packet to send (p->payload points to the data, e.g. next
mbed_official 0:51ac1d130fd4 735 protocol header; if dest == IP_HDRINCL, p already includes an IP
mbed_official 0:51ac1d130fd4 736 header and p->payload points to that IP header)
mbed_official 0:51ac1d130fd4 737 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
mbed_official 0:51ac1d130fd4 738 * IP address of the netif used to send is used as source address)
mbed_official 0:51ac1d130fd4 739 * @param dest the destination IP address to send the packet to
mbed_official 0:51ac1d130fd4 740 * @param ttl the TTL value to be set in the IP header
mbed_official 0:51ac1d130fd4 741 * @param tos the TOS value to be set in the IP header
mbed_official 0:51ac1d130fd4 742 * @param proto the PROTOCOL to be set in the IP header
mbed_official 0:51ac1d130fd4 743 *
mbed_official 0:51ac1d130fd4 744 * @return ERR_RTE if no route is found
mbed_official 0:51ac1d130fd4 745 * see ip_output_if() for more return values
mbed_official 0:51ac1d130fd4 746 */
mbed_official 0:51ac1d130fd4 747 err_t
mbed_official 0:51ac1d130fd4 748 ip_output(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
mbed_official 0:51ac1d130fd4 749 u8_t ttl, u8_t tos, u8_t proto)
mbed_official 0:51ac1d130fd4 750 {
mbed_official 0:51ac1d130fd4 751 struct netif *netif;
mbed_official 0:51ac1d130fd4 752
mbed_official 0:51ac1d130fd4 753 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
mbed_official 0:51ac1d130fd4 754 gets altered as the packet is passed down the stack */
mbed_official 0:51ac1d130fd4 755 LWIP_ASSERT("p->ref == 1", p->ref == 1);
mbed_official 0:51ac1d130fd4 756
mbed_official 0:51ac1d130fd4 757 if ((netif = ip_route(dest)) == NULL) {
mbed_official 0:51ac1d130fd4 758 LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mbed_official 0:51ac1d130fd4 759 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
mbed_official 0:51ac1d130fd4 760 IP_STATS_INC(ip.rterr);
mbed_official 0:51ac1d130fd4 761 return ERR_RTE;
mbed_official 0:51ac1d130fd4 762 }
mbed_official 0:51ac1d130fd4 763
mbed_official 0:51ac1d130fd4 764 return ip_output_if(p, src, dest, ttl, tos, proto, netif);
mbed_official 0:51ac1d130fd4 765 }
mbed_official 0:51ac1d130fd4 766
mbed_official 0:51ac1d130fd4 767 #if LWIP_NETIF_HWADDRHINT
mbed_official 0:51ac1d130fd4 768 /** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
mbed_official 0:51ac1d130fd4 769 * before calling ip_output_if.
mbed_official 0:51ac1d130fd4 770 *
mbed_official 0:51ac1d130fd4 771 * @param p the packet to send (p->payload points to the data, e.g. next
mbed_official 0:51ac1d130fd4 772 protocol header; if dest == IP_HDRINCL, p already includes an IP
mbed_official 0:51ac1d130fd4 773 header and p->payload points to that IP header)
mbed_official 0:51ac1d130fd4 774 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
mbed_official 0:51ac1d130fd4 775 * IP address of the netif used to send is used as source address)
mbed_official 0:51ac1d130fd4 776 * @param dest the destination IP address to send the packet to
mbed_official 0:51ac1d130fd4 777 * @param ttl the TTL value to be set in the IP header
mbed_official 0:51ac1d130fd4 778 * @param tos the TOS value to be set in the IP header
mbed_official 0:51ac1d130fd4 779 * @param proto the PROTOCOL to be set in the IP header
mbed_official 0:51ac1d130fd4 780 * @param addr_hint address hint pointer set to netif->addr_hint before
mbed_official 0:51ac1d130fd4 781 * calling ip_output_if()
mbed_official 0:51ac1d130fd4 782 *
mbed_official 0:51ac1d130fd4 783 * @return ERR_RTE if no route is found
mbed_official 0:51ac1d130fd4 784 * see ip_output_if() for more return values
mbed_official 0:51ac1d130fd4 785 */
mbed_official 0:51ac1d130fd4 786 err_t
mbed_official 0:51ac1d130fd4 787 ip_output_hinted(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
mbed_official 0:51ac1d130fd4 788 u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
mbed_official 0:51ac1d130fd4 789 {
mbed_official 0:51ac1d130fd4 790 struct netif *netif;
mbed_official 0:51ac1d130fd4 791 err_t err;
mbed_official 0:51ac1d130fd4 792
mbed_official 0:51ac1d130fd4 793 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
mbed_official 0:51ac1d130fd4 794 gets altered as the packet is passed down the stack */
mbed_official 0:51ac1d130fd4 795 LWIP_ASSERT("p->ref == 1", p->ref == 1);
mbed_official 0:51ac1d130fd4 796
mbed_official 0:51ac1d130fd4 797 if ((netif = ip_route(dest)) == NULL) {
mbed_official 0:51ac1d130fd4 798 LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mbed_official 0:51ac1d130fd4 799 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
mbed_official 0:51ac1d130fd4 800 IP_STATS_INC(ip.rterr);
mbed_official 0:51ac1d130fd4 801 return ERR_RTE;
mbed_official 0:51ac1d130fd4 802 }
mbed_official 0:51ac1d130fd4 803
mbed_official 0:51ac1d130fd4 804 netif->addr_hint = addr_hint;
mbed_official 0:51ac1d130fd4 805 err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
mbed_official 0:51ac1d130fd4 806 netif->addr_hint = NULL;
mbed_official 0:51ac1d130fd4 807
mbed_official 0:51ac1d130fd4 808 return err;
mbed_official 0:51ac1d130fd4 809 }
mbed_official 0:51ac1d130fd4 810 #endif /* LWIP_NETIF_HWADDRHINT*/
mbed_official 0:51ac1d130fd4 811
mbed_official 0:51ac1d130fd4 812 #if IP_DEBUG
mbed_official 0:51ac1d130fd4 813 /* Print an IP header by using LWIP_DEBUGF
mbed_official 0:51ac1d130fd4 814 * @param p an IP packet, p->payload pointing to the IP header
mbed_official 0:51ac1d130fd4 815 */
mbed_official 0:51ac1d130fd4 816 void
mbed_official 0:51ac1d130fd4 817 ip_debug_print(struct pbuf *p)
mbed_official 0:51ac1d130fd4 818 {
mbed_official 0:51ac1d130fd4 819 struct ip_hdr *iphdr = (struct ip_hdr *)p->payload;
mbed_official 0:51ac1d130fd4 820 u8_t *payload;
mbed_official 0:51ac1d130fd4 821
mbed_official 0:51ac1d130fd4 822 payload = (u8_t *)iphdr + IP_HLEN;
mbed_official 0:51ac1d130fd4 823
mbed_official 0:51ac1d130fd4 824 LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
mbed_official 0:51ac1d130fd4 825 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 826 LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n",
mbed_official 0:51ac1d130fd4 827 IPH_V(iphdr),
mbed_official 0:51ac1d130fd4 828 IPH_HL(iphdr),
mbed_official 0:51ac1d130fd4 829 IPH_TOS(iphdr),
mbed_official 0:51ac1d130fd4 830 ntohs(IPH_LEN(iphdr))));
mbed_official 0:51ac1d130fd4 831 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 832 LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n",
mbed_official 0:51ac1d130fd4 833 ntohs(IPH_ID(iphdr)),
mbed_official 0:51ac1d130fd4 834 ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
mbed_official 0:51ac1d130fd4 835 ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
mbed_official 0:51ac1d130fd4 836 ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
mbed_official 0:51ac1d130fd4 837 ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
mbed_official 0:51ac1d130fd4 838 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 839 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n",
mbed_official 0:51ac1d130fd4 840 IPH_TTL(iphdr),
mbed_official 0:51ac1d130fd4 841 IPH_PROTO(iphdr),
mbed_official 0:51ac1d130fd4 842 ntohs(IPH_CHKSUM(iphdr))));
mbed_official 0:51ac1d130fd4 843 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 844 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n",
mbed_official 0:51ac1d130fd4 845 ip4_addr1_16(&iphdr->src),
mbed_official 0:51ac1d130fd4 846 ip4_addr2_16(&iphdr->src),
mbed_official 0:51ac1d130fd4 847 ip4_addr3_16(&iphdr->src),
mbed_official 0:51ac1d130fd4 848 ip4_addr4_16(&iphdr->src)));
mbed_official 0:51ac1d130fd4 849 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 850 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n",
mbed_official 0:51ac1d130fd4 851 ip4_addr1_16(&iphdr->dest),
mbed_official 0:51ac1d130fd4 852 ip4_addr2_16(&iphdr->dest),
mbed_official 0:51ac1d130fd4 853 ip4_addr3_16(&iphdr->dest),
mbed_official 0:51ac1d130fd4 854 ip4_addr4_16(&iphdr->dest)));
mbed_official 0:51ac1d130fd4 855 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
mbed_official 0:51ac1d130fd4 856 }
mbed_official 0:51ac1d130fd4 857 #endif /* IP_DEBUG */