Richard Blimmel / Mbed 2 deprecated CIG_HTTPClient

HTTPClient using static IP

Dependencies:   mbed

NetServices/lwip/core/ipv4/ip.c@0:d8f2f7d5f31b, 2011-05-30 (annotated)

Committer:
mr_q
Date:
Mon May 30 11:53:37 2011 +0000
Revision:
0:d8f2f7d5f31b
v0.01 Draft

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mr_q 0:d8f2f7d5f31b 1 /**
mr_q 0:d8f2f7d5f31b 2 * @file
mr_q 0:d8f2f7d5f31b 3 * This is the IPv4 layer implementation for incoming and outgoing IP traffic.
mr_q 0:d8f2f7d5f31b 4 *
mr_q 0:d8f2f7d5f31b 5 * @see ip_frag.c
mr_q 0:d8f2f7d5f31b 6 *
mr_q 0:d8f2f7d5f31b 7 */
mr_q 0:d8f2f7d5f31b 8
mr_q 0:d8f2f7d5f31b 9 /*
mr_q 0:d8f2f7d5f31b 10 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mr_q 0:d8f2f7d5f31b 11 * All rights reserved.
mr_q 0:d8f2f7d5f31b 12 *
mr_q 0:d8f2f7d5f31b 13 * Redistribution and use in source and binary forms, with or without modification,
mr_q 0:d8f2f7d5f31b 14 * are permitted provided that the following conditions are met:
mr_q 0:d8f2f7d5f31b 15 *
mr_q 0:d8f2f7d5f31b 16 * 1. Redistributions of source code must retain the above copyright notice,
mr_q 0:d8f2f7d5f31b 17 * this list of conditions and the following disclaimer.
mr_q 0:d8f2f7d5f31b 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
mr_q 0:d8f2f7d5f31b 19 * this list of conditions and the following disclaimer in the documentation
mr_q 0:d8f2f7d5f31b 20 * and/or other materials provided with the distribution.
mr_q 0:d8f2f7d5f31b 21 * 3. The name of the author may not be used to endorse or promote products
mr_q 0:d8f2f7d5f31b 22 * derived from this software without specific prior written permission.
mr_q 0:d8f2f7d5f31b 23 *
mr_q 0:d8f2f7d5f31b 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mr_q 0:d8f2f7d5f31b 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mr_q 0:d8f2f7d5f31b 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mr_q 0:d8f2f7d5f31b 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mr_q 0:d8f2f7d5f31b 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mr_q 0:d8f2f7d5f31b 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mr_q 0:d8f2f7d5f31b 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mr_q 0:d8f2f7d5f31b 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mr_q 0:d8f2f7d5f31b 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mr_q 0:d8f2f7d5f31b 33 * OF SUCH DAMAGE.
mr_q 0:d8f2f7d5f31b 34 *
mr_q 0:d8f2f7d5f31b 35 * This file is part of the lwIP TCP/IP stack.
mr_q 0:d8f2f7d5f31b 36 *
mr_q 0:d8f2f7d5f31b 37 * Author: Adam Dunkels <adam@sics.se>
mr_q 0:d8f2f7d5f31b 38 *
mr_q 0:d8f2f7d5f31b 39 */
mr_q 0:d8f2f7d5f31b 40
mr_q 0:d8f2f7d5f31b 41 #include "lwip/opt.h"
mr_q 0:d8f2f7d5f31b 42 #include "lwip/ip.h"
mr_q 0:d8f2f7d5f31b 43 #include "lwip/def.h"
mr_q 0:d8f2f7d5f31b 44 #include "lwip/mem.h"
mr_q 0:d8f2f7d5f31b 45 #include "lwip/ip_frag.h"
mr_q 0:d8f2f7d5f31b 46 #include "lwip/inet_chksum.h"
mr_q 0:d8f2f7d5f31b 47 #include "lwip/netif.h"
mr_q 0:d8f2f7d5f31b 48 #include "lwip/icmp.h"
mr_q 0:d8f2f7d5f31b 49 #include "lwip/igmp.h"
mr_q 0:d8f2f7d5f31b 50 #include "lwip/raw.h"
mr_q 0:d8f2f7d5f31b 51 #include "lwip/udp.h"
mr_q 0:d8f2f7d5f31b 52 #include "lwip/tcp_impl.h"
mr_q 0:d8f2f7d5f31b 53 #include "lwip/snmp.h"
mr_q 0:d8f2f7d5f31b 54 #include "lwip/dhcp.h"
mr_q 0:d8f2f7d5f31b 55 #include "lwip/autoip.h"
mr_q 0:d8f2f7d5f31b 56 #include "lwip/stats.h"
mr_q 0:d8f2f7d5f31b 57 #include "arch/perf.h"
mr_q 0:d8f2f7d5f31b 58
mr_q 0:d8f2f7d5f31b 59 #include <string.h>
mr_q 0:d8f2f7d5f31b 60
mr_q 0:d8f2f7d5f31b 61 /** Set this to 0 in the rare case of wanting to call an extra function to
mr_q 0:d8f2f7d5f31b 62 * generate the IP checksum (in contrast to calculating it on-the-fly). */
mr_q 0:d8f2f7d5f31b 63 #ifndef LWIP_INLINE_IP_CHKSUM
mr_q 0:d8f2f7d5f31b 64 #define LWIP_INLINE_IP_CHKSUM 1
mr_q 0:d8f2f7d5f31b 65 #endif
mr_q 0:d8f2f7d5f31b 66 #if LWIP_INLINE_IP_CHKSUM && CHECKSUM_GEN_IP
mr_q 0:d8f2f7d5f31b 67 #define CHECKSUM_GEN_IP_INLINE 1
mr_q 0:d8f2f7d5f31b 68 #else
mr_q 0:d8f2f7d5f31b 69 #define CHECKSUM_GEN_IP_INLINE 0
mr_q 0:d8f2f7d5f31b 70 #endif
mr_q 0:d8f2f7d5f31b 71
mr_q 0:d8f2f7d5f31b 72 #if LWIP_DHCP || defined(LWIP_IP_ACCEPT_UDP_PORT)
mr_q 0:d8f2f7d5f31b 73 #define IP_ACCEPT_LINK_LAYER_ADDRESSING 1
mr_q 0:d8f2f7d5f31b 74
mr_q 0:d8f2f7d5f31b 75 /** Some defines for DHCP to let link-layer-addressed packets through while the
mr_q 0:d8f2f7d5f31b 76 * netif is down.
mr_q 0:d8f2f7d5f31b 77 * To use this in your own application/protocol, define LWIP_IP_ACCEPT_UDP_PORT
mr_q 0:d8f2f7d5f31b 78 * to return 1 if the port is accepted and 0 if the port is not accepted.
mr_q 0:d8f2f7d5f31b 79 */
mr_q 0:d8f2f7d5f31b 80 #if LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT)
mr_q 0:d8f2f7d5f31b 81 /* accept DHCP client port and custom port */
mr_q 0:d8f2f7d5f31b 82 #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (((port) == PP_NTOHS(DHCP_CLIENT_PORT)) \
mr_q 0:d8f2f7d5f31b 83 || (LWIP_IP_ACCEPT_UDP_PORT(port)))
mr_q 0:d8f2f7d5f31b 84 #elif defined(LWIP_IP_ACCEPT_UDP_PORT) /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
mr_q 0:d8f2f7d5f31b 85 /* accept custom port only */
mr_q 0:d8f2f7d5f31b 86 #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (LWIP_IP_ACCEPT_UDP_PORT(dst_port))
mr_q 0:d8f2f7d5f31b 87 #else /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
mr_q 0:d8f2f7d5f31b 88 /* accept DHCP client port only */
mr_q 0:d8f2f7d5f31b 89 #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) ((port) == PP_NTOHS(DHCP_CLIENT_PORT))
mr_q 0:d8f2f7d5f31b 90 #endif /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
mr_q 0:d8f2f7d5f31b 91
mr_q 0:d8f2f7d5f31b 92 #else /* LWIP_DHCP */
mr_q 0:d8f2f7d5f31b 93 #define IP_ACCEPT_LINK_LAYER_ADDRESSING 0
mr_q 0:d8f2f7d5f31b 94 #endif /* LWIP_DHCP */
mr_q 0:d8f2f7d5f31b 95
mr_q 0:d8f2f7d5f31b 96 /**
mr_q 0:d8f2f7d5f31b 97 * The interface that provided the packet for the current callback
mr_q 0:d8f2f7d5f31b 98 * invocation.
mr_q 0:d8f2f7d5f31b 99 */
mr_q 0:d8f2f7d5f31b 100 struct netif *current_netif;
mr_q 0:d8f2f7d5f31b 101
mr_q 0:d8f2f7d5f31b 102 /**
mr_q 0:d8f2f7d5f31b 103 * Header of the input packet currently being processed.
mr_q 0:d8f2f7d5f31b 104 */
mr_q 0:d8f2f7d5f31b 105 const struct ip_hdr *current_header;
mr_q 0:d8f2f7d5f31b 106 /** Source IP address of current_header */
mr_q 0:d8f2f7d5f31b 107 ip_addr_t current_iphdr_src;
mr_q 0:d8f2f7d5f31b 108 /** Destination IP address of current_header */
mr_q 0:d8f2f7d5f31b 109 ip_addr_t current_iphdr_dest;
mr_q 0:d8f2f7d5f31b 110
mr_q 0:d8f2f7d5f31b 111 /** The IP header ID of the next outgoing IP packet */
mr_q 0:d8f2f7d5f31b 112 static u16_t ip_id;
mr_q 0:d8f2f7d5f31b 113
mr_q 0:d8f2f7d5f31b 114 /**
mr_q 0:d8f2f7d5f31b 115 * Finds the appropriate network interface for a given IP address. It
mr_q 0:d8f2f7d5f31b 116 * searches the list of network interfaces linearly. A match is found
mr_q 0:d8f2f7d5f31b 117 * if the masked IP address of the network interface equals the masked
mr_q 0:d8f2f7d5f31b 118 * IP address given to the function.
mr_q 0:d8f2f7d5f31b 119 *
mr_q 0:d8f2f7d5f31b 120 * @param dest the destination IP address for which to find the route
mr_q 0:d8f2f7d5f31b 121 * @return the netif on which to send to reach dest
mr_q 0:d8f2f7d5f31b 122 */
mr_q 0:d8f2f7d5f31b 123 struct netif *
mr_q 0:d8f2f7d5f31b 124 ip_route(ip_addr_t *dest)
mr_q 0:d8f2f7d5f31b 125 {
mr_q 0:d8f2f7d5f31b 126 struct netif *netif;
mr_q 0:d8f2f7d5f31b 127
mr_q 0:d8f2f7d5f31b 128 /* iterate through netifs */
mr_q 0:d8f2f7d5f31b 129 for(netif = netif_list; netif != NULL; netif = netif->next) {
mr_q 0:d8f2f7d5f31b 130 /* network mask matches? */
mr_q 0:d8f2f7d5f31b 131 if (netif_is_up(netif)) {
mr_q 0:d8f2f7d5f31b 132 if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
mr_q 0:d8f2f7d5f31b 133 /* return netif on which to forward IP packet */
mr_q 0:d8f2f7d5f31b 134 return netif;
mr_q 0:d8f2f7d5f31b 135 }
mr_q 0:d8f2f7d5f31b 136 }
mr_q 0:d8f2f7d5f31b 137 }
mr_q 0:d8f2f7d5f31b 138 if ((netif_default == NULL) || (!netif_is_up(netif_default))) {
mr_q 0:d8f2f7d5f31b 139 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_route: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mr_q 0:d8f2f7d5f31b 140 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
mr_q 0:d8f2f7d5f31b 141 IP_STATS_INC(ip.rterr);
mr_q 0:d8f2f7d5f31b 142 snmp_inc_ipoutnoroutes();
mr_q 0:d8f2f7d5f31b 143 return NULL;
mr_q 0:d8f2f7d5f31b 144 }
mr_q 0:d8f2f7d5f31b 145 /* no matching netif found, use default netif */
mr_q 0:d8f2f7d5f31b 146 return netif_default;
mr_q 0:d8f2f7d5f31b 147 }
mr_q 0:d8f2f7d5f31b 148
mr_q 0:d8f2f7d5f31b 149 #if IP_FORWARD
mr_q 0:d8f2f7d5f31b 150 /**
mr_q 0:d8f2f7d5f31b 151 * Forwards an IP packet. It finds an appropriate route for the
mr_q 0:d8f2f7d5f31b 152 * packet, decrements the TTL value of the packet, adjusts the
mr_q 0:d8f2f7d5f31b 153 * checksum and outputs the packet on the appropriate interface.
mr_q 0:d8f2f7d5f31b 154 *
mr_q 0:d8f2f7d5f31b 155 * @param p the packet to forward (p->payload points to IP header)
mr_q 0:d8f2f7d5f31b 156 * @param iphdr the IP header of the input packet
mr_q 0:d8f2f7d5f31b 157 * @param inp the netif on which this packet was received
mr_q 0:d8f2f7d5f31b 158 */
mr_q 0:d8f2f7d5f31b 159 static void
mr_q 0:d8f2f7d5f31b 160 ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
mr_q 0:d8f2f7d5f31b 161 {
mr_q 0:d8f2f7d5f31b 162 struct netif *netif;
mr_q 0:d8f2f7d5f31b 163
mr_q 0:d8f2f7d5f31b 164 PERF_START;
mr_q 0:d8f2f7d5f31b 165
mr_q 0:d8f2f7d5f31b 166 /* RFC3927 2.7: do not forward link-local addresses */
mr_q 0:d8f2f7d5f31b 167 if (ip_addr_islinklocal(&current_iphdr_dest)) {
mr_q 0:d8f2f7d5f31b 168 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not forwarding LLA %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mr_q 0:d8f2f7d5f31b 169 ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
mr_q 0:d8f2f7d5f31b 170 ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
mr_q 0:d8f2f7d5f31b 171 goto return_noroute;
mr_q 0:d8f2f7d5f31b 172 }
mr_q 0:d8f2f7d5f31b 173
mr_q 0:d8f2f7d5f31b 174 /* Find network interface where to forward this IP packet to. */
mr_q 0:d8f2f7d5f31b 175 netif = ip_route(&current_iphdr_dest);
mr_q 0:d8f2f7d5f31b 176 if (netif == NULL) {
mr_q 0:d8f2f7d5f31b 177 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
mr_q 0:d8f2f7d5f31b 178 ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
mr_q 0:d8f2f7d5f31b 179 ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
mr_q 0:d8f2f7d5f31b 180 goto return_noroute;
mr_q 0:d8f2f7d5f31b 181 }
mr_q 0:d8f2f7d5f31b 182 /* Do not forward packets onto the same network interface on which
mr_q 0:d8f2f7d5f31b 183 * they arrived. */
mr_q 0:d8f2f7d5f31b 184 if (netif == inp) {
mr_q 0:d8f2f7d5f31b 185 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
mr_q 0:d8f2f7d5f31b 186 goto return_noroute;
mr_q 0:d8f2f7d5f31b 187 }
mr_q 0:d8f2f7d5f31b 188
mr_q 0:d8f2f7d5f31b 189 /* decrement TTL */
mr_q 0:d8f2f7d5f31b 190 IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
mr_q 0:d8f2f7d5f31b 191 /* send ICMP if TTL == 0 */
mr_q 0:d8f2f7d5f31b 192 if (IPH_TTL(iphdr) == 0) {
mr_q 0:d8f2f7d5f31b 193 snmp_inc_ipinhdrerrors();
mr_q 0:d8f2f7d5f31b 194 #if LWIP_ICMP
mr_q 0:d8f2f7d5f31b 195 /* Don't send ICMP messages in response to ICMP messages */
mr_q 0:d8f2f7d5f31b 196 if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
mr_q 0:d8f2f7d5f31b 197 icmp_time_exceeded(p, ICMP_TE_TTL);
mr_q 0:d8f2f7d5f31b 198 }
mr_q 0:d8f2f7d5f31b 199 #endif /* LWIP_ICMP */
mr_q 0:d8f2f7d5f31b 200 return;
mr_q 0:d8f2f7d5f31b 201 }
mr_q 0:d8f2f7d5f31b 202
mr_q 0:d8f2f7d5f31b 203 /* Incrementally update the IP checksum. */
mr_q 0:d8f2f7d5f31b 204 if (IPH_CHKSUM(iphdr) >= PP_HTONS(0xffff - 0x100)) {
mr_q 0:d8f2f7d5f31b 205 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100) + 1);
mr_q 0:d8f2f7d5f31b 206 } else {
mr_q 0:d8f2f7d5f31b 207 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100));
mr_q 0:d8f2f7d5f31b 208 }
mr_q 0:d8f2f7d5f31b 209
mr_q 0:d8f2f7d5f31b 210 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mr_q 0:d8f2f7d5f31b 211 ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
mr_q 0:d8f2f7d5f31b 212 ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
mr_q 0:d8f2f7d5f31b 213
mr_q 0:d8f2f7d5f31b 214 IP_STATS_INC(ip.fw);
mr_q 0:d8f2f7d5f31b 215 IP_STATS_INC(ip.xmit);
mr_q 0:d8f2f7d5f31b 216 snmp_inc_ipforwdatagrams();
mr_q 0:d8f2f7d5f31b 217
mr_q 0:d8f2f7d5f31b 218 PERF_STOP("ip_forward");
mr_q 0:d8f2f7d5f31b 219 /* transmit pbuf on chosen interface */
mr_q 0:d8f2f7d5f31b 220 netif->output(netif, p, &current_iphdr_dest);
mr_q 0:d8f2f7d5f31b 221 return;
mr_q 0:d8f2f7d5f31b 222 return_noroute:
mr_q 0:d8f2f7d5f31b 223 snmp_inc_ipoutnoroutes();
mr_q 0:d8f2f7d5f31b 224 }
mr_q 0:d8f2f7d5f31b 225 #endif /* IP_FORWARD */
mr_q 0:d8f2f7d5f31b 226
mr_q 0:d8f2f7d5f31b 227 /**
mr_q 0:d8f2f7d5f31b 228 * This function is called by the network interface device driver when
mr_q 0:d8f2f7d5f31b 229 * an IP packet is received. The function does the basic checks of the
mr_q 0:d8f2f7d5f31b 230 * IP header such as packet size being at least larger than the header
mr_q 0:d8f2f7d5f31b 231 * size etc. If the packet was not destined for us, the packet is
mr_q 0:d8f2f7d5f31b 232 * forwarded (using ip_forward). The IP checksum is always checked.
mr_q 0:d8f2f7d5f31b 233 *
mr_q 0:d8f2f7d5f31b 234 * Finally, the packet is sent to the upper layer protocol input function.
mr_q 0:d8f2f7d5f31b 235 *
mr_q 0:d8f2f7d5f31b 236 * @param p the received IP packet (p->payload points to IP header)
mr_q 0:d8f2f7d5f31b 237 * @param inp the netif on which this packet was received
mr_q 0:d8f2f7d5f31b 238 * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
mr_q 0:d8f2f7d5f31b 239 * processed, but currently always returns ERR_OK)
mr_q 0:d8f2f7d5f31b 240 */
mr_q 0:d8f2f7d5f31b 241 err_t
mr_q 0:d8f2f7d5f31b 242 ip_input(struct pbuf *p, struct netif *inp)
mr_q 0:d8f2f7d5f31b 243 {
mr_q 0:d8f2f7d5f31b 244 struct ip_hdr *iphdr;
mr_q 0:d8f2f7d5f31b 245 struct netif *netif;
mr_q 0:d8f2f7d5f31b 246 u16_t iphdr_hlen;
mr_q 0:d8f2f7d5f31b 247 u16_t iphdr_len;
mr_q 0:d8f2f7d5f31b 248 #if IP_ACCEPT_LINK_LAYER_ADDRESSING
mr_q 0:d8f2f7d5f31b 249 int check_ip_src=1;
mr_q 0:d8f2f7d5f31b 250 #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
mr_q 0:d8f2f7d5f31b 251
mr_q 0:d8f2f7d5f31b 252 IP_STATS_INC(ip.recv);
mr_q 0:d8f2f7d5f31b 253 snmp_inc_ipinreceives();
mr_q 0:d8f2f7d5f31b 254
mr_q 0:d8f2f7d5f31b 255 /* identify the IP header */
mr_q 0:d8f2f7d5f31b 256 iphdr = (struct ip_hdr *)p->payload;
mr_q 0:d8f2f7d5f31b 257 if (IPH_V(iphdr) != 4) {
mr_q 0:d8f2f7d5f31b 258 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
mr_q 0:d8f2f7d5f31b 259 ip_debug_print(p);
mr_q 0:d8f2f7d5f31b 260 pbuf_free(p);
mr_q 0:d8f2f7d5f31b 261 IP_STATS_INC(ip.err);
mr_q 0:d8f2f7d5f31b 262 IP_STATS_INC(ip.drop);
mr_q 0:d8f2f7d5f31b 263 snmp_inc_ipinhdrerrors();
mr_q 0:d8f2f7d5f31b 264 return ERR_OK;
mr_q 0:d8f2f7d5f31b 265 }
mr_q 0:d8f2f7d5f31b 266
mr_q 0:d8f2f7d5f31b 267 /* obtain IP header length in number of 32-bit words */
mr_q 0:d8f2f7d5f31b 268 iphdr_hlen = IPH_HL(iphdr);
mr_q 0:d8f2f7d5f31b 269 /* calculate IP header length in bytes */
mr_q 0:d8f2f7d5f31b 270 iphdr_hlen *= 4;
mr_q 0:d8f2f7d5f31b 271 /* obtain ip length in bytes */
mr_q 0:d8f2f7d5f31b 272 iphdr_len = ntohs(IPH_LEN(iphdr));
mr_q 0:d8f2f7d5f31b 273
mr_q 0:d8f2f7d5f31b 274 /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
mr_q 0:d8f2f7d5f31b 275 if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len)) {
mr_q 0:d8f2f7d5f31b 276 if (iphdr_hlen > p->len) {
mr_q 0:d8f2f7d5f31b 277 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
mr_q 0:d8f2f7d5f31b 278 ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
mr_q 0:d8f2f7d5f31b 279 iphdr_hlen, p->len));
mr_q 0:d8f2f7d5f31b 280 }
mr_q 0:d8f2f7d5f31b 281 if (iphdr_len > p->tot_len) {
mr_q 0:d8f2f7d5f31b 282 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
mr_q 0:d8f2f7d5f31b 283 ("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
mr_q 0:d8f2f7d5f31b 284 iphdr_len, p->tot_len));
mr_q 0:d8f2f7d5f31b 285 }
mr_q 0:d8f2f7d5f31b 286 /* free (drop) packet pbufs */
mr_q 0:d8f2f7d5f31b 287 pbuf_free(p);
mr_q 0:d8f2f7d5f31b 288 IP_STATS_INC(ip.lenerr);
mr_q 0:d8f2f7d5f31b 289 IP_STATS_INC(ip.drop);
mr_q 0:d8f2f7d5f31b 290 snmp_inc_ipindiscards();
mr_q 0:d8f2f7d5f31b 291 return ERR_OK;
mr_q 0:d8f2f7d5f31b 292 }
mr_q 0:d8f2f7d5f31b 293
mr_q 0:d8f2f7d5f31b 294 /* verify checksum */
mr_q 0:d8f2f7d5f31b 295 #if CHECKSUM_CHECK_IP
mr_q 0:d8f2f7d5f31b 296 if (inet_chksum(iphdr, iphdr_hlen) != 0) {
mr_q 0:d8f2f7d5f31b 297
mr_q 0:d8f2f7d5f31b 298 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
mr_q 0:d8f2f7d5f31b 299 ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
mr_q 0:d8f2f7d5f31b 300 ip_debug_print(p);
mr_q 0:d8f2f7d5f31b 301 pbuf_free(p);
mr_q 0:d8f2f7d5f31b 302 IP_STATS_INC(ip.chkerr);
mr_q 0:d8f2f7d5f31b 303 IP_STATS_INC(ip.drop);
mr_q 0:d8f2f7d5f31b 304 snmp_inc_ipinhdrerrors();
mr_q 0:d8f2f7d5f31b 305 return ERR_OK;
mr_q 0:d8f2f7d5f31b 306 }
mr_q 0:d8f2f7d5f31b 307 #endif
mr_q 0:d8f2f7d5f31b 308
mr_q 0:d8f2f7d5f31b 309 /* Trim pbuf. This should have been done at the netif layer,
mr_q 0:d8f2f7d5f31b 310 * but we'll do it anyway just to be sure that its done. */
mr_q 0:d8f2f7d5f31b 311 pbuf_realloc(p, iphdr_len);
mr_q 0:d8f2f7d5f31b 312
mr_q 0:d8f2f7d5f31b 313 /* copy IP addresses to aligned ip_addr_t */
mr_q 0:d8f2f7d5f31b 314 ip_addr_copy(current_iphdr_dest, iphdr->dest);
mr_q 0:d8f2f7d5f31b 315 ip_addr_copy(current_iphdr_src, iphdr->src);
mr_q 0:d8f2f7d5f31b 316
mr_q 0:d8f2f7d5f31b 317 /* match packet against an interface, i.e. is this packet for us? */
mr_q 0:d8f2f7d5f31b 318 #if LWIP_IGMP
mr_q 0:d8f2f7d5f31b 319 if (ip_addr_ismulticast(&current_iphdr_dest)) {
mr_q 0:d8f2f7d5f31b 320 if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &current_iphdr_dest))) {
mr_q 0:d8f2f7d5f31b 321 netif = inp;
mr_q 0:d8f2f7d5f31b 322 } else {
mr_q 0:d8f2f7d5f31b 323 netif = NULL;
mr_q 0:d8f2f7d5f31b 324 }
mr_q 0:d8f2f7d5f31b 325 } else
mr_q 0:d8f2f7d5f31b 326 #endif /* LWIP_IGMP */
mr_q 0:d8f2f7d5f31b 327 {
mr_q 0:d8f2f7d5f31b 328 /* start trying with inp. if that's not acceptable, start walking the
mr_q 0:d8f2f7d5f31b 329 list of configured netifs.
mr_q 0:d8f2f7d5f31b 330 'first' is used as a boolean to mark whether we started walking the list */
mr_q 0:d8f2f7d5f31b 331 int first = 1;
mr_q 0:d8f2f7d5f31b 332 netif = inp;
mr_q 0:d8f2f7d5f31b 333 do {
mr_q 0:d8f2f7d5f31b 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",
mr_q 0:d8f2f7d5f31b 335 ip4_addr_get_u32(&iphdr->dest), ip4_addr_get_u32(&netif->ip_addr),
mr_q 0:d8f2f7d5f31b 336 ip4_addr_get_u32(&iphdr->dest) & ip4_addr_get_u32(&netif->netmask),
mr_q 0:d8f2f7d5f31b 337 ip4_addr_get_u32(&netif->ip_addr) & ip4_addr_get_u32(&netif->netmask),
mr_q 0:d8f2f7d5f31b 338 ip4_addr_get_u32(&iphdr->dest) & ~ip4_addr_get_u32(&netif->netmask)));
mr_q 0:d8f2f7d5f31b 339
mr_q 0:d8f2f7d5f31b 340 /* interface is up and configured? */
mr_q 0:d8f2f7d5f31b 341 if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
mr_q 0:d8f2f7d5f31b 342 /* unicast to this interface address? */
mr_q 0:d8f2f7d5f31b 343 if (ip_addr_cmp(&current_iphdr_dest, &(netif->ip_addr)) ||
mr_q 0:d8f2f7d5f31b 344 /* or broadcast on this interface network address? */
mr_q 0:d8f2f7d5f31b 345 ip_addr_isbroadcast(&current_iphdr_dest, netif)) {
mr_q 0:d8f2f7d5f31b 346 LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
mr_q 0:d8f2f7d5f31b 347 netif->name[0], netif->name[1]));
mr_q 0:d8f2f7d5f31b 348 /* break out of for loop */
mr_q 0:d8f2f7d5f31b 349 break;
mr_q 0:d8f2f7d5f31b 350 }
mr_q 0:d8f2f7d5f31b 351 #if LWIP_AUTOIP
mr_q 0:d8f2f7d5f31b 352 /* connections to link-local addresses must persist after changing
mr_q 0:d8f2f7d5f31b 353 the netif's address (RFC3927 ch. 1.9) */
mr_q 0:d8f2f7d5f31b 354 if ((netif->autoip != NULL) &&
mr_q 0:d8f2f7d5f31b 355 ip_addr_cmp(&current_iphdr_dest, &(netif->autoip->llipaddr))) {
mr_q 0:d8f2f7d5f31b 356 LWIP_DEBUGF(IP_DEBUG, ("ip_input: LLA packet accepted on interface %c%c\n",
mr_q 0:d8f2f7d5f31b 357 netif->name[0], netif->name[1]));
mr_q 0:d8f2f7d5f31b 358 /* break out of for loop */
mr_q 0:d8f2f7d5f31b 359 break;
mr_q 0:d8f2f7d5f31b 360 }
mr_q 0:d8f2f7d5f31b 361 #endif /* LWIP_AUTOIP */
mr_q 0:d8f2f7d5f31b 362 }
mr_q 0:d8f2f7d5f31b 363 if (first) {
mr_q 0:d8f2f7d5f31b 364 first = 0;
mr_q 0:d8f2f7d5f31b 365 netif = netif_list;
mr_q 0:d8f2f7d5f31b 366 } else {
mr_q 0:d8f2f7d5f31b 367 netif = netif->next;
mr_q 0:d8f2f7d5f31b 368 }
mr_q 0:d8f2f7d5f31b 369 if (netif == inp) {
mr_q 0:d8f2f7d5f31b 370 netif = netif->next;
mr_q 0:d8f2f7d5f31b 371 }
mr_q 0:d8f2f7d5f31b 372 } while(netif != NULL);
mr_q 0:d8f2f7d5f31b 373 }
mr_q 0:d8f2f7d5f31b 374
mr_q 0:d8f2f7d5f31b 375 #if IP_ACCEPT_LINK_LAYER_ADDRESSING
mr_q 0:d8f2f7d5f31b 376 /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
mr_q 0:d8f2f7d5f31b 377 * using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
mr_q 0:d8f2f7d5f31b 378 * According to RFC 1542 section 3.1.1, referred by RFC 2131).
mr_q 0:d8f2f7d5f31b 379 *
mr_q 0:d8f2f7d5f31b 380 * If you want to accept private broadcast communication while a netif is down,
mr_q 0:d8f2f7d5f31b 381 * define LWIP_IP_ACCEPT_UDP_PORT(dst_port), e.g.:
mr_q 0:d8f2f7d5f31b 382 *
mr_q 0:d8f2f7d5f31b 383 * #define LWIP_IP_ACCEPT_UDP_PORT(dst_port) ((dst_port) == PP_NTOHS(12345))
mr_q 0:d8f2f7d5f31b 384 */
mr_q 0:d8f2f7d5f31b 385 if (netif == NULL) {
mr_q 0:d8f2f7d5f31b 386 /* remote port is DHCP server? */
mr_q 0:d8f2f7d5f31b 387 if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
mr_q 0:d8f2f7d5f31b 388 struct udp_hdr *udphdr = (struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen);
mr_q 0:d8f2f7d5f31b 389 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
mr_q 0:d8f2f7d5f31b 390 ntohs(udphdr->dest)));
mr_q 0:d8f2f7d5f31b 391 if (IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(udphdr->dest)) {
mr_q 0:d8f2f7d5f31b 392 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: DHCP packet accepted.\n"));
mr_q 0:d8f2f7d5f31b 393 netif = inp;
mr_q 0:d8f2f7d5f31b 394 check_ip_src = 0;
mr_q 0:d8f2f7d5f31b 395 }
mr_q 0:d8f2f7d5f31b 396 }
mr_q 0:d8f2f7d5f31b 397 }
mr_q 0:d8f2f7d5f31b 398 #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
mr_q 0:d8f2f7d5f31b 399
mr_q 0:d8f2f7d5f31b 400 /* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
mr_q 0:d8f2f7d5f31b 401 #if IP_ACCEPT_LINK_LAYER_ADDRESSING
mr_q 0:d8f2f7d5f31b 402 /* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
mr_q 0:d8f2f7d5f31b 403 if (check_ip_src && !ip_addr_isany(&current_iphdr_src))
mr_q 0:d8f2f7d5f31b 404 #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
mr_q 0:d8f2f7d5f31b 405 { if ((ip_addr_isbroadcast(&current_iphdr_src, inp)) ||
mr_q 0:d8f2f7d5f31b 406 (ip_addr_ismulticast(&current_iphdr_src))) {
mr_q 0:d8f2f7d5f31b 407 /* packet source is not valid */
mr_q 0:d8f2f7d5f31b 408 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("ip_input: packet source is not valid.\n"));
mr_q 0:d8f2f7d5f31b 409 /* free (drop) packet pbufs */
mr_q 0:d8f2f7d5f31b 410 pbuf_free(p);
mr_q 0:d8f2f7d5f31b 411 IP_STATS_INC(ip.drop);
mr_q 0:d8f2f7d5f31b 412 snmp_inc_ipinaddrerrors();
mr_q 0:d8f2f7d5f31b 413 snmp_inc_ipindiscards();
mr_q 0:d8f2f7d5f31b 414 return ERR_OK;
mr_q 0:d8f2f7d5f31b 415 }
mr_q 0:d8f2f7d5f31b 416 }
mr_q 0:d8f2f7d5f31b 417
mr_q 0:d8f2f7d5f31b 418 /* packet not for us? */
mr_q 0:d8f2f7d5f31b 419 if (netif == NULL) {
mr_q 0:d8f2f7d5f31b 420 /* packet not for us, route or discard */
mr_q 0:d8f2f7d5f31b 421 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: packet not for us.\n"));
mr_q 0:d8f2f7d5f31b 422 #if IP_FORWARD
mr_q 0:d8f2f7d5f31b 423 /* non-broadcast packet? */
mr_q 0:d8f2f7d5f31b 424 if (!ip_addr_isbroadcast(&current_iphdr_dest, inp)) {
mr_q 0:d8f2f7d5f31b 425 /* try to forward IP packet on (other) interfaces */
mr_q 0:d8f2f7d5f31b 426 ip_forward(p, iphdr, inp);
mr_q 0:d8f2f7d5f31b 427 } else
mr_q 0:d8f2f7d5f31b 428 #endif /* IP_FORWARD */
mr_q 0:d8f2f7d5f31b 429 {
mr_q 0:d8f2f7d5f31b 430 snmp_inc_ipinaddrerrors();
mr_q 0:d8f2f7d5f31b 431 snmp_inc_ipindiscards();
mr_q 0:d8f2f7d5f31b 432 }
mr_q 0:d8f2f7d5f31b 433 pbuf_free(p);
mr_q 0:d8f2f7d5f31b 434 return ERR_OK;
mr_q 0:d8f2f7d5f31b 435 }
mr_q 0:d8f2f7d5f31b 436 /* packet consists of multiple fragments? */
mr_q 0:d8f2f7d5f31b 437 if ((IPH_OFFSET(iphdr) & PP_HTONS(IP_OFFMASK | IP_MF)) != 0) {
mr_q 0:d8f2f7d5f31b 438 #if IP_REASSEMBLY /* packet fragment reassembly code present? */
mr_q 0:d8f2f7d5f31b 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",
mr_q 0:d8f2f7d5f31b 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));
mr_q 0:d8f2f7d5f31b 441 /* reassemble the packet*/
mr_q 0:d8f2f7d5f31b 442 p = ip_reass(p);
mr_q 0:d8f2f7d5f31b 443 /* packet not fully reassembled yet? */
mr_q 0:d8f2f7d5f31b 444 if (p == NULL) {
mr_q 0:d8f2f7d5f31b 445 return ERR_OK;
mr_q 0:d8f2f7d5f31b 446 }
mr_q 0:d8f2f7d5f31b 447 iphdr = (struct ip_hdr *)p->payload;
mr_q 0:d8f2f7d5f31b 448 #else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
mr_q 0:d8f2f7d5f31b 449 pbuf_free(p);
mr_q 0:d8f2f7d5f31b 450 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
mr_q 0:d8f2f7d5f31b 451 ntohs(IPH_OFFSET(iphdr))));
mr_q 0:d8f2f7d5f31b 452 IP_STATS_INC(ip.opterr);
mr_q 0:d8f2f7d5f31b 453 IP_STATS_INC(ip.drop);
mr_q 0:d8f2f7d5f31b 454 /* unsupported protocol feature */
mr_q 0:d8f2f7d5f31b 455 snmp_inc_ipinunknownprotos();
mr_q 0:d8f2f7d5f31b 456 return ERR_OK;
mr_q 0:d8f2f7d5f31b 457 #endif /* IP_REASSEMBLY */
mr_q 0:d8f2f7d5f31b 458 }
mr_q 0:d8f2f7d5f31b 459
mr_q 0:d8f2f7d5f31b 460 #if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
mr_q 0:d8f2f7d5f31b 461
mr_q 0:d8f2f7d5f31b 462 #if LWIP_IGMP
mr_q 0:d8f2f7d5f31b 463 /* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
mr_q 0:d8f2f7d5f31b 464 if((iphdr_hlen > IP_HLEN) && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
mr_q 0:d8f2f7d5f31b 465 #else
mr_q 0:d8f2f7d5f31b 466 if (iphdr_hlen > IP_HLEN) {
mr_q 0:d8f2f7d5f31b 467 #endif /* LWIP_IGMP */
mr_q 0:d8f2f7d5f31b 468 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
mr_q 0:d8f2f7d5f31b 469 pbuf_free(p);
mr_q 0:d8f2f7d5f31b 470 IP_STATS_INC(ip.opterr);
mr_q 0:d8f2f7d5f31b 471 IP_STATS_INC(ip.drop);
mr_q 0:d8f2f7d5f31b 472 /* unsupported protocol feature */
mr_q 0:d8f2f7d5f31b 473 snmp_inc_ipinunknownprotos();
mr_q 0:d8f2f7d5f31b 474 return ERR_OK;
mr_q 0:d8f2f7d5f31b 475 }
mr_q 0:d8f2f7d5f31b 476 #endif /* IP_OPTIONS_ALLOWED == 0 */
mr_q 0:d8f2f7d5f31b 477
mr_q 0:d8f2f7d5f31b 478 /* send to upper layers */
mr_q 0:d8f2f7d5f31b 479 LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
mr_q 0:d8f2f7d5f31b 480 ip_debug_print(p);
mr_q 0:d8f2f7d5f31b 481 LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
mr_q 0:d8f2f7d5f31b 482
mr_q 0:d8f2f7d5f31b 483 current_netif = inp;
mr_q 0:d8f2f7d5f31b 484 current_header = iphdr;
mr_q 0:d8f2f7d5f31b 485
mr_q 0:d8f2f7d5f31b 486 #if LWIP_RAW
mr_q 0:d8f2f7d5f31b 487 /* raw input did not eat the packet? */
mr_q 0:d8f2f7d5f31b 488 if (raw_input(p, inp) == 0)
mr_q 0:d8f2f7d5f31b 489 #endif /* LWIP_RAW */
mr_q 0:d8f2f7d5f31b 490 {
mr_q 0:d8f2f7d5f31b 491
mr_q 0:d8f2f7d5f31b 492 switch (IPH_PROTO(iphdr)) {
mr_q 0:d8f2f7d5f31b 493 #if LWIP_UDP
mr_q 0:d8f2f7d5f31b 494 case IP_PROTO_UDP:
mr_q 0:d8f2f7d5f31b 495 #if LWIP_UDPLITE
mr_q 0:d8f2f7d5f31b 496 case IP_PROTO_UDPLITE:
mr_q 0:d8f2f7d5f31b 497 #endif /* LWIP_UDPLITE */
mr_q 0:d8f2f7d5f31b 498 snmp_inc_ipindelivers();
mr_q 0:d8f2f7d5f31b 499 udp_input(p, inp);
mr_q 0:d8f2f7d5f31b 500 break;
mr_q 0:d8f2f7d5f31b 501 #endif /* LWIP_UDP */
mr_q 0:d8f2f7d5f31b 502 #if LWIP_TCP
mr_q 0:d8f2f7d5f31b 503 case IP_PROTO_TCP:
mr_q 0:d8f2f7d5f31b 504 snmp_inc_ipindelivers();
mr_q 0:d8f2f7d5f31b 505 tcp_input(p, inp);
mr_q 0:d8f2f7d5f31b 506 break;
mr_q 0:d8f2f7d5f31b 507 #endif /* LWIP_TCP */
mr_q 0:d8f2f7d5f31b 508 #if LWIP_ICMP
mr_q 0:d8f2f7d5f31b 509 case IP_PROTO_ICMP:
mr_q 0:d8f2f7d5f31b 510 snmp_inc_ipindelivers();
mr_q 0:d8f2f7d5f31b 511 icmp_input(p, inp);
mr_q 0:d8f2f7d5f31b 512 break;
mr_q 0:d8f2f7d5f31b 513 #endif /* LWIP_ICMP */
mr_q 0:d8f2f7d5f31b 514 #if LWIP_IGMP
mr_q 0:d8f2f7d5f31b 515 case IP_PROTO_IGMP:
mr_q 0:d8f2f7d5f31b 516 igmp_input(p, inp, &current_iphdr_dest);
mr_q 0:d8f2f7d5f31b 517 break;
mr_q 0:d8f2f7d5f31b 518 #endif /* LWIP_IGMP */
mr_q 0:d8f2f7d5f31b 519 default:
mr_q 0:d8f2f7d5f31b 520 #if LWIP_ICMP
mr_q 0:d8f2f7d5f31b 521 /* send ICMP destination protocol unreachable unless is was a broadcast */
mr_q 0:d8f2f7d5f31b 522 if (!ip_addr_isbroadcast(&current_iphdr_dest, inp) &&
mr_q 0:d8f2f7d5f31b 523 !ip_addr_ismulticast(&current_iphdr_dest)) {
mr_q 0:d8f2f7d5f31b 524 p->payload = iphdr;
mr_q 0:d8f2f7d5f31b 525 icmp_dest_unreach(p, ICMP_DUR_PROTO);
mr_q 0:d8f2f7d5f31b 526 }
mr_q 0:d8f2f7d5f31b 527 #endif /* LWIP_ICMP */
mr_q 0:d8f2f7d5f31b 528 pbuf_free(p);
mr_q 0:d8f2f7d5f31b 529
mr_q 0:d8f2f7d5f31b 530 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
mr_q 0:d8f2f7d5f31b 531
mr_q 0:d8f2f7d5f31b 532 IP_STATS_INC(ip.proterr);
mr_q 0:d8f2f7d5f31b 533 IP_STATS_INC(ip.drop);
mr_q 0:d8f2f7d5f31b 534 snmp_inc_ipinunknownprotos();
mr_q 0:d8f2f7d5f31b 535 }
mr_q 0:d8f2f7d5f31b 536 }
mr_q 0:d8f2f7d5f31b 537
mr_q 0:d8f2f7d5f31b 538 current_netif = NULL;
mr_q 0:d8f2f7d5f31b 539 current_header = NULL;
mr_q 0:d8f2f7d5f31b 540 ip_addr_set_any(&current_iphdr_src);
mr_q 0:d8f2f7d5f31b 541 ip_addr_set_any(&current_iphdr_dest);
mr_q 0:d8f2f7d5f31b 542
mr_q 0:d8f2f7d5f31b 543 return ERR_OK;
mr_q 0:d8f2f7d5f31b 544 }
mr_q 0:d8f2f7d5f31b 545
mr_q 0:d8f2f7d5f31b 546 /**
mr_q 0:d8f2f7d5f31b 547 * Sends an IP packet on a network interface. This function constructs
mr_q 0:d8f2f7d5f31b 548 * the IP header and calculates the IP header checksum. If the source
mr_q 0:d8f2f7d5f31b 549 * IP address is NULL, the IP address of the outgoing network
mr_q 0:d8f2f7d5f31b 550 * interface is filled in as source address.
mr_q 0:d8f2f7d5f31b 551 * If the destination IP address is IP_HDRINCL, p is assumed to already
mr_q 0:d8f2f7d5f31b 552 * include an IP header and p->payload points to it instead of the data.
mr_q 0:d8f2f7d5f31b 553 *
mr_q 0:d8f2f7d5f31b 554 * @param p the packet to send (p->payload points to the data, e.g. next
mr_q 0:d8f2f7d5f31b 555 protocol header; if dest == IP_HDRINCL, p already includes an IP
mr_q 0:d8f2f7d5f31b 556 header and p->payload points to that IP header)
mr_q 0:d8f2f7d5f31b 557 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
mr_q 0:d8f2f7d5f31b 558 * IP address of the netif used to send is used as source address)
mr_q 0:d8f2f7d5f31b 559 * @param dest the destination IP address to send the packet to
mr_q 0:d8f2f7d5f31b 560 * @param ttl the TTL value to be set in the IP header
mr_q 0:d8f2f7d5f31b 561 * @param tos the TOS value to be set in the IP header
mr_q 0:d8f2f7d5f31b 562 * @param proto the PROTOCOL to be set in the IP header
mr_q 0:d8f2f7d5f31b 563 * @param netif the netif on which to send this packet
mr_q 0:d8f2f7d5f31b 564 * @return ERR_OK if the packet was sent OK
mr_q 0:d8f2f7d5f31b 565 * ERR_BUF if p doesn't have enough space for IP/LINK headers
mr_q 0:d8f2f7d5f31b 566 * returns errors returned by netif->output
mr_q 0:d8f2f7d5f31b 567 *
mr_q 0:d8f2f7d5f31b 568 * @note ip_id: RFC791 "some host may be able to simply use
mr_q 0:d8f2f7d5f31b 569 * unique identifiers independent of destination"
mr_q 0:d8f2f7d5f31b 570 */
mr_q 0:d8f2f7d5f31b 571 err_t
mr_q 0:d8f2f7d5f31b 572 ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
mr_q 0:d8f2f7d5f31b 573 u8_t ttl, u8_t tos,
mr_q 0:d8f2f7d5f31b 574 u8_t proto, struct netif *netif)
mr_q 0:d8f2f7d5f31b 575 {
mr_q 0:d8f2f7d5f31b 576 #if IP_OPTIONS_SEND
mr_q 0:d8f2f7d5f31b 577 return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
mr_q 0:d8f2f7d5f31b 578 }
mr_q 0:d8f2f7d5f31b 579
mr_q 0:d8f2f7d5f31b 580 /**
mr_q 0:d8f2f7d5f31b 581 * Same as ip_output_if() but with the possibility to include IP options:
mr_q 0:d8f2f7d5f31b 582 *
mr_q 0:d8f2f7d5f31b 583 * @ param ip_options pointer to the IP options, copied into the IP header
mr_q 0:d8f2f7d5f31b 584 * @ param optlen length of ip_options
mr_q 0:d8f2f7d5f31b 585 */
mr_q 0:d8f2f7d5f31b 586 err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
mr_q 0:d8f2f7d5f31b 587 u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
mr_q 0:d8f2f7d5f31b 588 u16_t optlen)
mr_q 0:d8f2f7d5f31b 589 {
mr_q 0:d8f2f7d5f31b 590 #endif /* IP_OPTIONS_SEND */
mr_q 0:d8f2f7d5f31b 591 struct ip_hdr *iphdr;
mr_q 0:d8f2f7d5f31b 592 ip_addr_t dest_addr;
mr_q 0:d8f2f7d5f31b 593 #if CHECKSUM_GEN_IP_INLINE
mr_q 0:d8f2f7d5f31b 594 u32_t chk_sum = 0;
mr_q 0:d8f2f7d5f31b 595 #endif /* CHECKSUM_GEN_IP_INLINE */
mr_q 0:d8f2f7d5f31b 596
mr_q 0:d8f2f7d5f31b 597 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
mr_q 0:d8f2f7d5f31b 598 gets altered as the packet is passed down the stack */
mr_q 0:d8f2f7d5f31b 599 LWIP_ASSERT("p->ref == 1", p->ref == 1);
mr_q 0:d8f2f7d5f31b 600
mr_q 0:d8f2f7d5f31b 601 snmp_inc_ipoutrequests();
mr_q 0:d8f2f7d5f31b 602
mr_q 0:d8f2f7d5f31b 603 /* Should the IP header be generated or is it already included in p? */
mr_q 0:d8f2f7d5f31b 604 if (dest != IP_HDRINCL) {
mr_q 0:d8f2f7d5f31b 605 u16_t ip_hlen = IP_HLEN;
mr_q 0:d8f2f7d5f31b 606 #if IP_OPTIONS_SEND
mr_q 0:d8f2f7d5f31b 607 u16_t optlen_aligned = 0;
mr_q 0:d8f2f7d5f31b 608 if (optlen != 0) {
mr_q 0:d8f2f7d5f31b 609 #if CHECKSUM_GEN_IP_INLINE
mr_q 0:d8f2f7d5f31b 610 int i;
mr_q 0:d8f2f7d5f31b 611 #endif /* CHECKSUM_GEN_IP_INLINE */
mr_q 0:d8f2f7d5f31b 612 /* round up to a multiple of 4 */
mr_q 0:d8f2f7d5f31b 613 optlen_aligned = ((optlen + 3) & ~3);
mr_q 0:d8f2f7d5f31b 614 ip_hlen += optlen_aligned;
mr_q 0:d8f2f7d5f31b 615 /* First write in the IP options */
mr_q 0:d8f2f7d5f31b 616 if (pbuf_header(p, optlen_aligned)) {
mr_q 0:d8f2f7d5f31b 617 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
mr_q 0:d8f2f7d5f31b 618 IP_STATS_INC(ip.err);
mr_q 0:d8f2f7d5f31b 619 snmp_inc_ipoutdiscards();
mr_q 0:d8f2f7d5f31b 620 return ERR_BUF;
mr_q 0:d8f2f7d5f31b 621 }
mr_q 0:d8f2f7d5f31b 622 MEMCPY(p->payload, ip_options, optlen);
mr_q 0:d8f2f7d5f31b 623 if (optlen < optlen_aligned) {
mr_q 0:d8f2f7d5f31b 624 /* zero the remaining bytes */
mr_q 0:d8f2f7d5f31b 625 memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
mr_q 0:d8f2f7d5f31b 626 }
mr_q 0:d8f2f7d5f31b 627 #if CHECKSUM_GEN_IP_INLINE
mr_q 0:d8f2f7d5f31b 628 for (i = 0; i < optlen_aligned; i += sizeof(u16_t)) {
mr_q 0:d8f2f7d5f31b 629 chk_sum += ((u16_t*)p->payload)[i];
mr_q 0:d8f2f7d5f31b 630 }
mr_q 0:d8f2f7d5f31b 631 #endif /* CHECKSUM_GEN_IP_INLINE */
mr_q 0:d8f2f7d5f31b 632 }
mr_q 0:d8f2f7d5f31b 633 #endif /* IP_OPTIONS_SEND */
mr_q 0:d8f2f7d5f31b 634 /* generate IP header */
mr_q 0:d8f2f7d5f31b 635 if (pbuf_header(p, IP_HLEN)) {
mr_q 0:d8f2f7d5f31b 636 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output: not enough room for IP header in pbuf\n"));
mr_q 0:d8f2f7d5f31b 637
mr_q 0:d8f2f7d5f31b 638 IP_STATS_INC(ip.err);
mr_q 0:d8f2f7d5f31b 639 snmp_inc_ipoutdiscards();
mr_q 0:d8f2f7d5f31b 640 return ERR_BUF;
mr_q 0:d8f2f7d5f31b 641 }
mr_q 0:d8f2f7d5f31b 642
mr_q 0:d8f2f7d5f31b 643 iphdr = (struct ip_hdr *)p->payload;
mr_q 0:d8f2f7d5f31b 644 LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
mr_q 0:d8f2f7d5f31b 645 (p->len >= sizeof(struct ip_hdr)));
mr_q 0:d8f2f7d5f31b 646
mr_q 0:d8f2f7d5f31b 647 IPH_TTL_SET(iphdr, ttl);
mr_q 0:d8f2f7d5f31b 648 IPH_PROTO_SET(iphdr, proto);
mr_q 0:d8f2f7d5f31b 649 #if CHECKSUM_GEN_IP_INLINE
mr_q 0:d8f2f7d5f31b 650 chk_sum += LWIP_MAKE_U16(proto, ttl);
mr_q 0:d8f2f7d5f31b 651 #endif /* CHECKSUM_GEN_IP_INLINE */
mr_q 0:d8f2f7d5f31b 652
mr_q 0:d8f2f7d5f31b 653 /* dest cannot be NULL here */
mr_q 0:d8f2f7d5f31b 654 ip_addr_copy(iphdr->dest, *dest);
mr_q 0:d8f2f7d5f31b 655 #if CHECKSUM_GEN_IP_INLINE
mr_q 0:d8f2f7d5f31b 656 chk_sum += ip4_addr_get_u32(&iphdr->dest) & 0xFFFF;
mr_q 0:d8f2f7d5f31b 657 chk_sum += ip4_addr_get_u32(&iphdr->dest) >> 16;
mr_q 0:d8f2f7d5f31b 658 #endif /* CHECKSUM_GEN_IP_INLINE */
mr_q 0:d8f2f7d5f31b 659
mr_q 0:d8f2f7d5f31b 660 IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
mr_q 0:d8f2f7d5f31b 661 #if CHECKSUM_GEN_IP_INLINE
mr_q 0:d8f2f7d5f31b 662 chk_sum += iphdr->_v_hl_tos;
mr_q 0:d8f2f7d5f31b 663 #endif /* CHECKSUM_GEN_IP_INLINE */
mr_q 0:d8f2f7d5f31b 664 IPH_LEN_SET(iphdr, htons(p->tot_len));
mr_q 0:d8f2f7d5f31b 665 #if CHECKSUM_GEN_IP_INLINE
mr_q 0:d8f2f7d5f31b 666 chk_sum += iphdr->_len;
mr_q 0:d8f2f7d5f31b 667 #endif /* CHECKSUM_GEN_IP_INLINE */
mr_q 0:d8f2f7d5f31b 668 IPH_OFFSET_SET(iphdr, 0);
mr_q 0:d8f2f7d5f31b 669 IPH_ID_SET(iphdr, htons(ip_id));
mr_q 0:d8f2f7d5f31b 670 #if CHECKSUM_GEN_IP_INLINE
mr_q 0:d8f2f7d5f31b 671 chk_sum += iphdr->_id;
mr_q 0:d8f2f7d5f31b 672 #endif /* CHECKSUM_GEN_IP_INLINE */
mr_q 0:d8f2f7d5f31b 673 ++ip_id;
mr_q 0:d8f2f7d5f31b 674
mr_q 0:d8f2f7d5f31b 675 if (ip_addr_isany(src)) {
mr_q 0:d8f2f7d5f31b 676 ip_addr_copy(iphdr->src, netif->ip_addr);
mr_q 0:d8f2f7d5f31b 677 } else {
mr_q 0:d8f2f7d5f31b 678 /* src cannot be NULL here */
mr_q 0:d8f2f7d5f31b 679 ip_addr_copy(iphdr->src, *src);
mr_q 0:d8f2f7d5f31b 680 }
mr_q 0:d8f2f7d5f31b 681
mr_q 0:d8f2f7d5f31b 682 #if CHECKSUM_GEN_IP_INLINE
mr_q 0:d8f2f7d5f31b 683 chk_sum += ip4_addr_get_u32(&iphdr->src) & 0xFFFF;
mr_q 0:d8f2f7d5f31b 684 chk_sum += ip4_addr_get_u32(&iphdr->src) >> 16;
mr_q 0:d8f2f7d5f31b 685 chk_sum = (chk_sum >> 16) + (chk_sum & 0xFFFF);
mr_q 0:d8f2f7d5f31b 686 chk_sum = (chk_sum >> 16) + chk_sum;
mr_q 0:d8f2f7d5f31b 687 chk_sum = ~chk_sum;
mr_q 0:d8f2f7d5f31b 688 iphdr->_chksum = chk_sum; /* network order */
mr_q 0:d8f2f7d5f31b 689 #else /* CHECKSUM_GEN_IP_INLINE */
mr_q 0:d8f2f7d5f31b 690 IPH_CHKSUM_SET(iphdr, 0);
mr_q 0:d8f2f7d5f31b 691 #if CHECKSUM_GEN_IP
mr_q 0:d8f2f7d5f31b 692 IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
mr_q 0:d8f2f7d5f31b 693 #endif
mr_q 0:d8f2f7d5f31b 694 #endif /* CHECKSUM_GEN_IP_INLINE */
mr_q 0:d8f2f7d5f31b 695 } else {
mr_q 0:d8f2f7d5f31b 696 /* IP header already included in p */
mr_q 0:d8f2f7d5f31b 697 iphdr = (struct ip_hdr *)p->payload;
mr_q 0:d8f2f7d5f31b 698 ip_addr_copy(dest_addr, iphdr->dest);
mr_q 0:d8f2f7d5f31b 699 dest = &dest_addr;
mr_q 0:d8f2f7d5f31b 700 }
mr_q 0:d8f2f7d5f31b 701
mr_q 0:d8f2f7d5f31b 702 IP_STATS_INC(ip.xmit);
mr_q 0:d8f2f7d5f31b 703
mr_q 0:d8f2f7d5f31b 704 LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
mr_q 0:d8f2f7d5f31b 705 ip_debug_print(p);
mr_q 0:d8f2f7d5f31b 706
mr_q 0:d8f2f7d5f31b 707 #if ENABLE_LOOPBACK
mr_q 0:d8f2f7d5f31b 708 if (ip_addr_cmp(dest, &netif->ip_addr)) {
mr_q 0:d8f2f7d5f31b 709 /* Packet to self, enqueue it for loopback */
mr_q 0:d8f2f7d5f31b 710 LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
mr_q 0:d8f2f7d5f31b 711 return netif_loop_output(netif, p, dest);
mr_q 0:d8f2f7d5f31b 712 }
mr_q 0:d8f2f7d5f31b 713 #if LWIP_IGMP
mr_q 0:d8f2f7d5f31b 714 if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) {
mr_q 0:d8f2f7d5f31b 715 netif_loop_output(netif, p, dest);
mr_q 0:d8f2f7d5f31b 716 }
mr_q 0:d8f2f7d5f31b 717 #endif /* LWIP_IGMP */
mr_q 0:d8f2f7d5f31b 718 #endif /* ENABLE_LOOPBACK */
mr_q 0:d8f2f7d5f31b 719 #if IP_FRAG
mr_q 0:d8f2f7d5f31b 720 /* don't fragment if interface has mtu set to 0 [loopif] */
mr_q 0:d8f2f7d5f31b 721 if (netif->mtu && (p->tot_len > netif->mtu)) {
mr_q 0:d8f2f7d5f31b 722 return ip_frag(p, netif, dest);
mr_q 0:d8f2f7d5f31b 723 }
mr_q 0:d8f2f7d5f31b 724 #endif /* IP_FRAG */
mr_q 0:d8f2f7d5f31b 725
mr_q 0:d8f2f7d5f31b 726 LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
mr_q 0:d8f2f7d5f31b 727 return netif->output(netif, p, dest);
mr_q 0:d8f2f7d5f31b 728 }
mr_q 0:d8f2f7d5f31b 729
mr_q 0:d8f2f7d5f31b 730 /**
mr_q 0:d8f2f7d5f31b 731 * Simple interface to ip_output_if. It finds the outgoing network
mr_q 0:d8f2f7d5f31b 732 * interface and calls upon ip_output_if to do the actual work.
mr_q 0:d8f2f7d5f31b 733 *
mr_q 0:d8f2f7d5f31b 734 * @param p the packet to send (p->payload points to the data, e.g. next
mr_q 0:d8f2f7d5f31b 735 protocol header; if dest == IP_HDRINCL, p already includes an IP
mr_q 0:d8f2f7d5f31b 736 header and p->payload points to that IP header)
mr_q 0:d8f2f7d5f31b 737 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
mr_q 0:d8f2f7d5f31b 738 * IP address of the netif used to send is used as source address)
mr_q 0:d8f2f7d5f31b 739 * @param dest the destination IP address to send the packet to
mr_q 0:d8f2f7d5f31b 740 * @param ttl the TTL value to be set in the IP header
mr_q 0:d8f2f7d5f31b 741 * @param tos the TOS value to be set in the IP header
mr_q 0:d8f2f7d5f31b 742 * @param proto the PROTOCOL to be set in the IP header
mr_q 0:d8f2f7d5f31b 743 *
mr_q 0:d8f2f7d5f31b 744 * @return ERR_RTE if no route is found
mr_q 0:d8f2f7d5f31b 745 * see ip_output_if() for more return values
mr_q 0:d8f2f7d5f31b 746 */
mr_q 0:d8f2f7d5f31b 747 err_t
mr_q 0:d8f2f7d5f31b 748 ip_output(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
mr_q 0:d8f2f7d5f31b 749 u8_t ttl, u8_t tos, u8_t proto)
mr_q 0:d8f2f7d5f31b 750 {
mr_q 0:d8f2f7d5f31b 751 struct netif *netif;
mr_q 0:d8f2f7d5f31b 752
mr_q 0:d8f2f7d5f31b 753 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
mr_q 0:d8f2f7d5f31b 754 gets altered as the packet is passed down the stack */
mr_q 0:d8f2f7d5f31b 755 LWIP_ASSERT("p->ref == 1", p->ref == 1);
mr_q 0:d8f2f7d5f31b 756
mr_q 0:d8f2f7d5f31b 757 if ((netif = ip_route(dest)) == NULL) {
mr_q 0:d8f2f7d5f31b 758 LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mr_q 0:d8f2f7d5f31b 759 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
mr_q 0:d8f2f7d5f31b 760 IP_STATS_INC(ip.rterr);
mr_q 0:d8f2f7d5f31b 761 return ERR_RTE;
mr_q 0:d8f2f7d5f31b 762 }
mr_q 0:d8f2f7d5f31b 763
mr_q 0:d8f2f7d5f31b 764 return ip_output_if(p, src, dest, ttl, tos, proto, netif);
mr_q 0:d8f2f7d5f31b 765 }
mr_q 0:d8f2f7d5f31b 766
mr_q 0:d8f2f7d5f31b 767 #if LWIP_NETIF_HWADDRHINT
mr_q 0:d8f2f7d5f31b 768 /** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
mr_q 0:d8f2f7d5f31b 769 * before calling ip_output_if.
mr_q 0:d8f2f7d5f31b 770 *
mr_q 0:d8f2f7d5f31b 771 * @param p the packet to send (p->payload points to the data, e.g. next
mr_q 0:d8f2f7d5f31b 772 protocol header; if dest == IP_HDRINCL, p already includes an IP
mr_q 0:d8f2f7d5f31b 773 header and p->payload points to that IP header)
mr_q 0:d8f2f7d5f31b 774 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
mr_q 0:d8f2f7d5f31b 775 * IP address of the netif used to send is used as source address)
mr_q 0:d8f2f7d5f31b 776 * @param dest the destination IP address to send the packet to
mr_q 0:d8f2f7d5f31b 777 * @param ttl the TTL value to be set in the IP header
mr_q 0:d8f2f7d5f31b 778 * @param tos the TOS value to be set in the IP header
mr_q 0:d8f2f7d5f31b 779 * @param proto the PROTOCOL to be set in the IP header
mr_q 0:d8f2f7d5f31b 780 * @param addr_hint address hint pointer set to netif->addr_hint before
mr_q 0:d8f2f7d5f31b 781 * calling ip_output_if()
mr_q 0:d8f2f7d5f31b 782 *
mr_q 0:d8f2f7d5f31b 783 * @return ERR_RTE if no route is found
mr_q 0:d8f2f7d5f31b 784 * see ip_output_if() for more return values
mr_q 0:d8f2f7d5f31b 785 */
mr_q 0:d8f2f7d5f31b 786 err_t
mr_q 0:d8f2f7d5f31b 787 ip_output_hinted(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
mr_q 0:d8f2f7d5f31b 788 u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
mr_q 0:d8f2f7d5f31b 789 {
mr_q 0:d8f2f7d5f31b 790 struct netif *netif;
mr_q 0:d8f2f7d5f31b 791 err_t err;
mr_q 0:d8f2f7d5f31b 792
mr_q 0:d8f2f7d5f31b 793 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
mr_q 0:d8f2f7d5f31b 794 gets altered as the packet is passed down the stack */
mr_q 0:d8f2f7d5f31b 795 LWIP_ASSERT("p->ref == 1", p->ref == 1);
mr_q 0:d8f2f7d5f31b 796
mr_q 0:d8f2f7d5f31b 797 if ((netif = ip_route(dest)) == NULL) {
mr_q 0:d8f2f7d5f31b 798 LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
mr_q 0:d8f2f7d5f31b 799 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
mr_q 0:d8f2f7d5f31b 800 IP_STATS_INC(ip.rterr);
mr_q 0:d8f2f7d5f31b 801 return ERR_RTE;
mr_q 0:d8f2f7d5f31b 802 }
mr_q 0:d8f2f7d5f31b 803
mr_q 0:d8f2f7d5f31b 804 netif->addr_hint = addr_hint;
mr_q 0:d8f2f7d5f31b 805 err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
mr_q 0:d8f2f7d5f31b 806 netif->addr_hint = NULL;
mr_q 0:d8f2f7d5f31b 807
mr_q 0:d8f2f7d5f31b 808 return err;
mr_q 0:d8f2f7d5f31b 809 }
mr_q 0:d8f2f7d5f31b 810 #endif /* LWIP_NETIF_HWADDRHINT*/
mr_q 0:d8f2f7d5f31b 811
mr_q 0:d8f2f7d5f31b 812 #if IP_DEBUG
mr_q 0:d8f2f7d5f31b 813 /* Print an IP header by using LWIP_DEBUGF
mr_q 0:d8f2f7d5f31b 814 * @param p an IP packet, p->payload pointing to the IP header
mr_q 0:d8f2f7d5f31b 815 */
mr_q 0:d8f2f7d5f31b 816 void
mr_q 0:d8f2f7d5f31b 817 ip_debug_print(struct pbuf *p)
mr_q 0:d8f2f7d5f31b 818 {
mr_q 0:d8f2f7d5f31b 819 struct ip_hdr *iphdr = (struct ip_hdr *)p->payload;
mr_q 0:d8f2f7d5f31b 820 u8_t *payload;
mr_q 0:d8f2f7d5f31b 821
mr_q 0:d8f2f7d5f31b 822 payload = (u8_t *)iphdr + IP_HLEN;
mr_q 0:d8f2f7d5f31b 823
mr_q 0:d8f2f7d5f31b 824 LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
mr_q 0:d8f2f7d5f31b 825 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
mr_q 0:d8f2f7d5f31b 826 LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n",
mr_q 0:d8f2f7d5f31b 827 IPH_V(iphdr),
mr_q 0:d8f2f7d5f31b 828 IPH_HL(iphdr),
mr_q 0:d8f2f7d5f31b 829 IPH_TOS(iphdr),
mr_q 0:d8f2f7d5f31b 830 ntohs(IPH_LEN(iphdr))));
mr_q 0:d8f2f7d5f31b 831 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
mr_q 0:d8f2f7d5f31b 832 LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n",
mr_q 0:d8f2f7d5f31b 833 ntohs(IPH_ID(iphdr)),
mr_q 0:d8f2f7d5f31b 834 ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
mr_q 0:d8f2f7d5f31b 835 ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
mr_q 0:d8f2f7d5f31b 836 ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
mr_q 0:d8f2f7d5f31b 837 ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
mr_q 0:d8f2f7d5f31b 838 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
mr_q 0:d8f2f7d5f31b 839 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n",
mr_q 0:d8f2f7d5f31b 840 IPH_TTL(iphdr),
mr_q 0:d8f2f7d5f31b 841 IPH_PROTO(iphdr),
mr_q 0:d8f2f7d5f31b 842 ntohs(IPH_CHKSUM(iphdr))));
mr_q 0:d8f2f7d5f31b 843 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
mr_q 0:d8f2f7d5f31b 844 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n",
mr_q 0:d8f2f7d5f31b 845 ip4_addr1_16(&iphdr->src),
mr_q 0:d8f2f7d5f31b 846 ip4_addr2_16(&iphdr->src),
mr_q 0:d8f2f7d5f31b 847 ip4_addr3_16(&iphdr->src),
mr_q 0:d8f2f7d5f31b 848 ip4_addr4_16(&iphdr->src)));
mr_q 0:d8f2f7d5f31b 849 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
mr_q 0:d8f2f7d5f31b 850 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n",
mr_q 0:d8f2f7d5f31b 851 ip4_addr1_16(&iphdr->dest),
mr_q 0:d8f2f7d5f31b 852 ip4_addr2_16(&iphdr->dest),
mr_q 0:d8f2f7d5f31b 853 ip4_addr3_16(&iphdr->dest),
mr_q 0:d8f2f7d5f31b 854 ip4_addr4_16(&iphdr->dest)));
mr_q 0:d8f2f7d5f31b 855 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
mr_q 0:d8f2f7d5f31b 856 }
mr_q 0:d8f2f7d5f31b 857 #endif /* IP_DEBUG */