CK Sin / Mbed 2 deprecated Ethernetwebsocket

Ethernetwebsoc

Dependencies:   C12832_lcd LM75B WebSocketClient mbed-rtos mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/core/ipv4/ip.c@0:0ed2a7c7190c, 2013-05-31 (annotated)

Committer:
GordonSin
Date:
Fri May 31 04:09:54 2013 +0000
Revision:
0:0ed2a7c7190c
31/5/2013;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
GordonSin 0:0ed2a7c7190c 1 /**
GordonSin 0:0ed2a7c7190c 2 * @file
GordonSin 0:0ed2a7c7190c 3 * This is the IPv4 layer implementation for incoming and outgoing IP traffic.
GordonSin 0:0ed2a7c7190c 4 *
GordonSin 0:0ed2a7c7190c 5 * @see ip_frag.c
GordonSin 0:0ed2a7c7190c 6 *
GordonSin 0:0ed2a7c7190c 7 */
GordonSin 0:0ed2a7c7190c 8
GordonSin 0:0ed2a7c7190c 9 /*
GordonSin 0:0ed2a7c7190c 10 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
GordonSin 0:0ed2a7c7190c 11 * All rights reserved.
GordonSin 0:0ed2a7c7190c 12 *
GordonSin 0:0ed2a7c7190c 13 * Redistribution and use in source and binary forms, with or without modification,
GordonSin 0:0ed2a7c7190c 14 * are permitted provided that the following conditions are met:
GordonSin 0:0ed2a7c7190c 15 *
GordonSin 0:0ed2a7c7190c 16 * 1. Redistributions of source code must retain the above copyright notice,
GordonSin 0:0ed2a7c7190c 17 * this list of conditions and the following disclaimer.
GordonSin 0:0ed2a7c7190c 18 * 2. Redistributions in binary form must reproduce the above copyright notice,
GordonSin 0:0ed2a7c7190c 19 * this list of conditions and the following disclaimer in the documentation
GordonSin 0:0ed2a7c7190c 20 * and/or other materials provided with the distribution.
GordonSin 0:0ed2a7c7190c 21 * 3. The name of the author may not be used to endorse or promote products
GordonSin 0:0ed2a7c7190c 22 * derived from this software without specific prior written permission.
GordonSin 0:0ed2a7c7190c 23 *
GordonSin 0:0ed2a7c7190c 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
GordonSin 0:0ed2a7c7190c 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
GordonSin 0:0ed2a7c7190c 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
GordonSin 0:0ed2a7c7190c 27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
GordonSin 0:0ed2a7c7190c 28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
GordonSin 0:0ed2a7c7190c 29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
GordonSin 0:0ed2a7c7190c 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
GordonSin 0:0ed2a7c7190c 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
GordonSin 0:0ed2a7c7190c 32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
GordonSin 0:0ed2a7c7190c 33 * OF SUCH DAMAGE.
GordonSin 0:0ed2a7c7190c 34 *
GordonSin 0:0ed2a7c7190c 35 * This file is part of the lwIP TCP/IP stack.
GordonSin 0:0ed2a7c7190c 36 *
GordonSin 0:0ed2a7c7190c 37 * Author: Adam Dunkels <adam@sics.se>
GordonSin 0:0ed2a7c7190c 38 *
GordonSin 0:0ed2a7c7190c 39 */
GordonSin 0:0ed2a7c7190c 40
GordonSin 0:0ed2a7c7190c 41 #include "lwip/opt.h"
GordonSin 0:0ed2a7c7190c 42 #include "lwip/ip.h"
GordonSin 0:0ed2a7c7190c 43 #include "lwip/def.h"
GordonSin 0:0ed2a7c7190c 44 #include "lwip/mem.h"
GordonSin 0:0ed2a7c7190c 45 #include "lwip/ip_frag.h"
GordonSin 0:0ed2a7c7190c 46 #include "lwip/inet_chksum.h"
GordonSin 0:0ed2a7c7190c 47 #include "lwip/netif.h"
GordonSin 0:0ed2a7c7190c 48 #include "lwip/icmp.h"
GordonSin 0:0ed2a7c7190c 49 #include "lwip/igmp.h"
GordonSin 0:0ed2a7c7190c 50 #include "lwip/raw.h"
GordonSin 0:0ed2a7c7190c 51 #include "lwip/udp.h"
GordonSin 0:0ed2a7c7190c 52 #include "lwip/tcp_impl.h"
GordonSin 0:0ed2a7c7190c 53 #include "lwip/snmp.h"
GordonSin 0:0ed2a7c7190c 54 #include "lwip/dhcp.h"
GordonSin 0:0ed2a7c7190c 55 #include "lwip/autoip.h"
GordonSin 0:0ed2a7c7190c 56 #include "lwip/stats.h"
GordonSin 0:0ed2a7c7190c 57 #include "arch/perf.h"
GordonSin 0:0ed2a7c7190c 58
GordonSin 0:0ed2a7c7190c 59 #include <string.h>
GordonSin 0:0ed2a7c7190c 60
GordonSin 0:0ed2a7c7190c 61 /** Set this to 0 in the rare case of wanting to call an extra function to
GordonSin 0:0ed2a7c7190c 62 * generate the IP checksum (in contrast to calculating it on-the-fly). */
GordonSin 0:0ed2a7c7190c 63 #ifndef LWIP_INLINE_IP_CHKSUM
GordonSin 0:0ed2a7c7190c 64 #define LWIP_INLINE_IP_CHKSUM 1
GordonSin 0:0ed2a7c7190c 65 #endif
GordonSin 0:0ed2a7c7190c 66 #if LWIP_INLINE_IP_CHKSUM && CHECKSUM_GEN_IP
GordonSin 0:0ed2a7c7190c 67 #define CHECKSUM_GEN_IP_INLINE 1
GordonSin 0:0ed2a7c7190c 68 #else
GordonSin 0:0ed2a7c7190c 69 #define CHECKSUM_GEN_IP_INLINE 0
GordonSin 0:0ed2a7c7190c 70 #endif
GordonSin 0:0ed2a7c7190c 71
GordonSin 0:0ed2a7c7190c 72 #if LWIP_DHCP || defined(LWIP_IP_ACCEPT_UDP_PORT)
GordonSin 0:0ed2a7c7190c 73 #define IP_ACCEPT_LINK_LAYER_ADDRESSING 1
GordonSin 0:0ed2a7c7190c 74
GordonSin 0:0ed2a7c7190c 75 /** Some defines for DHCP to let link-layer-addressed packets through while the
GordonSin 0:0ed2a7c7190c 76 * netif is down.
GordonSin 0:0ed2a7c7190c 77 * To use this in your own application/protocol, define LWIP_IP_ACCEPT_UDP_PORT
GordonSin 0:0ed2a7c7190c 78 * to return 1 if the port is accepted and 0 if the port is not accepted.
GordonSin 0:0ed2a7c7190c 79 */
GordonSin 0:0ed2a7c7190c 80 #if LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT)
GordonSin 0:0ed2a7c7190c 81 /* accept DHCP client port and custom port */
GordonSin 0:0ed2a7c7190c 82 #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (((port) == PP_NTOHS(DHCP_CLIENT_PORT)) \
GordonSin 0:0ed2a7c7190c 83 || (LWIP_IP_ACCEPT_UDP_PORT(port)))
GordonSin 0:0ed2a7c7190c 84 #elif defined(LWIP_IP_ACCEPT_UDP_PORT) /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
GordonSin 0:0ed2a7c7190c 85 /* accept custom port only */
GordonSin 0:0ed2a7c7190c 86 #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (LWIP_IP_ACCEPT_UDP_PORT(dst_port))
GordonSin 0:0ed2a7c7190c 87 #else /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
GordonSin 0:0ed2a7c7190c 88 /* accept DHCP client port only */
GordonSin 0:0ed2a7c7190c 89 #define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) ((port) == PP_NTOHS(DHCP_CLIENT_PORT))
GordonSin 0:0ed2a7c7190c 90 #endif /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
GordonSin 0:0ed2a7c7190c 91
GordonSin 0:0ed2a7c7190c 92 #else /* LWIP_DHCP */
GordonSin 0:0ed2a7c7190c 93 #define IP_ACCEPT_LINK_LAYER_ADDRESSING 0
GordonSin 0:0ed2a7c7190c 94 #endif /* LWIP_DHCP */
GordonSin 0:0ed2a7c7190c 95
GordonSin 0:0ed2a7c7190c 96 /**
GordonSin 0:0ed2a7c7190c 97 * The interface that provided the packet for the current callback
GordonSin 0:0ed2a7c7190c 98 * invocation.
GordonSin 0:0ed2a7c7190c 99 */
GordonSin 0:0ed2a7c7190c 100 struct netif *current_netif;
GordonSin 0:0ed2a7c7190c 101
GordonSin 0:0ed2a7c7190c 102 /**
GordonSin 0:0ed2a7c7190c 103 * Header of the input packet currently being processed.
GordonSin 0:0ed2a7c7190c 104 */
GordonSin 0:0ed2a7c7190c 105 const struct ip_hdr *current_header;
GordonSin 0:0ed2a7c7190c 106 /** Source IP address of current_header */
GordonSin 0:0ed2a7c7190c 107 ip_addr_t current_iphdr_src;
GordonSin 0:0ed2a7c7190c 108 /** Destination IP address of current_header */
GordonSin 0:0ed2a7c7190c 109 ip_addr_t current_iphdr_dest;
GordonSin 0:0ed2a7c7190c 110
GordonSin 0:0ed2a7c7190c 111 /** The IP header ID of the next outgoing IP packet */
GordonSin 0:0ed2a7c7190c 112 static u16_t ip_id;
GordonSin 0:0ed2a7c7190c 113
GordonSin 0:0ed2a7c7190c 114 /**
GordonSin 0:0ed2a7c7190c 115 * Finds the appropriate network interface for a given IP address. It
GordonSin 0:0ed2a7c7190c 116 * searches the list of network interfaces linearly. A match is found
GordonSin 0:0ed2a7c7190c 117 * if the masked IP address of the network interface equals the masked
GordonSin 0:0ed2a7c7190c 118 * IP address given to the function.
GordonSin 0:0ed2a7c7190c 119 *
GordonSin 0:0ed2a7c7190c 120 * @param dest the destination IP address for which to find the route
GordonSin 0:0ed2a7c7190c 121 * @return the netif on which to send to reach dest
GordonSin 0:0ed2a7c7190c 122 */
GordonSin 0:0ed2a7c7190c 123 struct netif *
GordonSin 0:0ed2a7c7190c 124 ip_route(ip_addr_t *dest)
GordonSin 0:0ed2a7c7190c 125 {
GordonSin 0:0ed2a7c7190c 126 struct netif *netif;
GordonSin 0:0ed2a7c7190c 127
GordonSin 0:0ed2a7c7190c 128 /* iterate through netifs */
GordonSin 0:0ed2a7c7190c 129 for(netif = netif_list; netif != NULL; netif = netif->next) {
GordonSin 0:0ed2a7c7190c 130 /* network mask matches? */
GordonSin 0:0ed2a7c7190c 131 if (netif_is_up(netif)) {
GordonSin 0:0ed2a7c7190c 132 if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
GordonSin 0:0ed2a7c7190c 133 /* return netif on which to forward IP packet */
GordonSin 0:0ed2a7c7190c 134 return netif;
GordonSin 0:0ed2a7c7190c 135 }
GordonSin 0:0ed2a7c7190c 136 }
GordonSin 0:0ed2a7c7190c 137 }
GordonSin 0:0ed2a7c7190c 138 if ((netif_default == NULL) || (!netif_is_up(netif_default))) {
GordonSin 0:0ed2a7c7190c 139 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_route: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
GordonSin 0:0ed2a7c7190c 140 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
GordonSin 0:0ed2a7c7190c 141 IP_STATS_INC(ip.rterr);
GordonSin 0:0ed2a7c7190c 142 snmp_inc_ipoutnoroutes();
GordonSin 0:0ed2a7c7190c 143 return NULL;
GordonSin 0:0ed2a7c7190c 144 }
GordonSin 0:0ed2a7c7190c 145 /* no matching netif found, use default netif */
GordonSin 0:0ed2a7c7190c 146 return netif_default;
GordonSin 0:0ed2a7c7190c 147 }
GordonSin 0:0ed2a7c7190c 148
GordonSin 0:0ed2a7c7190c 149 #if IP_FORWARD
GordonSin 0:0ed2a7c7190c 150 /**
GordonSin 0:0ed2a7c7190c 151 * Forwards an IP packet. It finds an appropriate route for the
GordonSin 0:0ed2a7c7190c 152 * packet, decrements the TTL value of the packet, adjusts the
GordonSin 0:0ed2a7c7190c 153 * checksum and outputs the packet on the appropriate interface.
GordonSin 0:0ed2a7c7190c 154 *
GordonSin 0:0ed2a7c7190c 155 * @param p the packet to forward (p->payload points to IP header)
GordonSin 0:0ed2a7c7190c 156 * @param iphdr the IP header of the input packet
GordonSin 0:0ed2a7c7190c 157 * @param inp the netif on which this packet was received
GordonSin 0:0ed2a7c7190c 158 */
GordonSin 0:0ed2a7c7190c 159 static void
GordonSin 0:0ed2a7c7190c 160 ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
GordonSin 0:0ed2a7c7190c 161 {
GordonSin 0:0ed2a7c7190c 162 struct netif *netif;
GordonSin 0:0ed2a7c7190c 163
GordonSin 0:0ed2a7c7190c 164 PERF_START;
GordonSin 0:0ed2a7c7190c 165
GordonSin 0:0ed2a7c7190c 166 /* RFC3927 2.7: do not forward link-local addresses */
GordonSin 0:0ed2a7c7190c 167 if (ip_addr_islinklocal(&current_iphdr_dest)) {
GordonSin 0:0ed2a7c7190c 168 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not forwarding LLA %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
GordonSin 0:0ed2a7c7190c 169 ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
GordonSin 0:0ed2a7c7190c 170 ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
GordonSin 0:0ed2a7c7190c 171 goto return_noroute;
GordonSin 0:0ed2a7c7190c 172 }
GordonSin 0:0ed2a7c7190c 173
GordonSin 0:0ed2a7c7190c 174 /* Find network interface where to forward this IP packet to. */
GordonSin 0:0ed2a7c7190c 175 netif = ip_route(&current_iphdr_dest);
GordonSin 0:0ed2a7c7190c 176 if (netif == NULL) {
GordonSin 0:0ed2a7c7190c 177 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
GordonSin 0:0ed2a7c7190c 178 ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
GordonSin 0:0ed2a7c7190c 179 ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
GordonSin 0:0ed2a7c7190c 180 goto return_noroute;
GordonSin 0:0ed2a7c7190c 181 }
GordonSin 0:0ed2a7c7190c 182 /* Do not forward packets onto the same network interface on which
GordonSin 0:0ed2a7c7190c 183 * they arrived. */
GordonSin 0:0ed2a7c7190c 184 if (netif == inp) {
GordonSin 0:0ed2a7c7190c 185 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
GordonSin 0:0ed2a7c7190c 186 goto return_noroute;
GordonSin 0:0ed2a7c7190c 187 }
GordonSin 0:0ed2a7c7190c 188
GordonSin 0:0ed2a7c7190c 189 /* decrement TTL */
GordonSin 0:0ed2a7c7190c 190 IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
GordonSin 0:0ed2a7c7190c 191 /* send ICMP if TTL == 0 */
GordonSin 0:0ed2a7c7190c 192 if (IPH_TTL(iphdr) == 0) {
GordonSin 0:0ed2a7c7190c 193 snmp_inc_ipinhdrerrors();
GordonSin 0:0ed2a7c7190c 194 #if LWIP_ICMP
GordonSin 0:0ed2a7c7190c 195 /* Don't send ICMP messages in response to ICMP messages */
GordonSin 0:0ed2a7c7190c 196 if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
GordonSin 0:0ed2a7c7190c 197 icmp_time_exceeded(p, ICMP_TE_TTL);
GordonSin 0:0ed2a7c7190c 198 }
GordonSin 0:0ed2a7c7190c 199 #endif /* LWIP_ICMP */
GordonSin 0:0ed2a7c7190c 200 return;
GordonSin 0:0ed2a7c7190c 201 }
GordonSin 0:0ed2a7c7190c 202
GordonSin 0:0ed2a7c7190c 203 /* Incrementally update the IP checksum. */
GordonSin 0:0ed2a7c7190c 204 if (IPH_CHKSUM(iphdr) >= PP_HTONS(0xffffU - 0x100)) {
GordonSin 0:0ed2a7c7190c 205 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100) + 1);
GordonSin 0:0ed2a7c7190c 206 } else {
GordonSin 0:0ed2a7c7190c 207 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100));
GordonSin 0:0ed2a7c7190c 208 }
GordonSin 0:0ed2a7c7190c 209
GordonSin 0:0ed2a7c7190c 210 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
GordonSin 0:0ed2a7c7190c 211 ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
GordonSin 0:0ed2a7c7190c 212 ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
GordonSin 0:0ed2a7c7190c 213
GordonSin 0:0ed2a7c7190c 214 IP_STATS_INC(ip.fw);
GordonSin 0:0ed2a7c7190c 215 IP_STATS_INC(ip.xmit);
GordonSin 0:0ed2a7c7190c 216 snmp_inc_ipforwdatagrams();
GordonSin 0:0ed2a7c7190c 217
GordonSin 0:0ed2a7c7190c 218 PERF_STOP("ip_forward");
GordonSin 0:0ed2a7c7190c 219 /* transmit pbuf on chosen interface */
GordonSin 0:0ed2a7c7190c 220 netif->output(netif, p, &current_iphdr_dest);
GordonSin 0:0ed2a7c7190c 221 return;
GordonSin 0:0ed2a7c7190c 222 return_noroute:
GordonSin 0:0ed2a7c7190c 223 snmp_inc_ipoutnoroutes();
GordonSin 0:0ed2a7c7190c 224 }
GordonSin 0:0ed2a7c7190c 225 #endif /* IP_FORWARD */
GordonSin 0:0ed2a7c7190c 226
GordonSin 0:0ed2a7c7190c 227 /**
GordonSin 0:0ed2a7c7190c 228 * This function is called by the network interface device driver when
GordonSin 0:0ed2a7c7190c 229 * an IP packet is received. The function does the basic checks of the
GordonSin 0:0ed2a7c7190c 230 * IP header such as packet size being at least larger than the header
GordonSin 0:0ed2a7c7190c 231 * size etc. If the packet was not destined for us, the packet is
GordonSin 0:0ed2a7c7190c 232 * forwarded (using ip_forward). The IP checksum is always checked.
GordonSin 0:0ed2a7c7190c 233 *
GordonSin 0:0ed2a7c7190c 234 * Finally, the packet is sent to the upper layer protocol input function.
GordonSin 0:0ed2a7c7190c 235 *
GordonSin 0:0ed2a7c7190c 236 * @param p the received IP packet (p->payload points to IP header)
GordonSin 0:0ed2a7c7190c 237 * @param inp the netif on which this packet was received
GordonSin 0:0ed2a7c7190c 238 * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
GordonSin 0:0ed2a7c7190c 239 * processed, but currently always returns ERR_OK)
GordonSin 0:0ed2a7c7190c 240 */
GordonSin 0:0ed2a7c7190c 241 err_t
GordonSin 0:0ed2a7c7190c 242 ip_input(struct pbuf *p, struct netif *inp)
GordonSin 0:0ed2a7c7190c 243 {
GordonSin 0:0ed2a7c7190c 244 struct ip_hdr *iphdr;
GordonSin 0:0ed2a7c7190c 245 struct netif *netif;
GordonSin 0:0ed2a7c7190c 246 u16_t iphdr_hlen;
GordonSin 0:0ed2a7c7190c 247 u16_t iphdr_len;
GordonSin 0:0ed2a7c7190c 248 #if IP_ACCEPT_LINK_LAYER_ADDRESSING
GordonSin 0:0ed2a7c7190c 249 int check_ip_src=1;
GordonSin 0:0ed2a7c7190c 250 #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
GordonSin 0:0ed2a7c7190c 251
GordonSin 0:0ed2a7c7190c 252 IP_STATS_INC(ip.recv);
GordonSin 0:0ed2a7c7190c 253 snmp_inc_ipinreceives();
GordonSin 0:0ed2a7c7190c 254
GordonSin 0:0ed2a7c7190c 255 /* identify the IP header */
GordonSin 0:0ed2a7c7190c 256 iphdr = (struct ip_hdr *)p->payload;
GordonSin 0:0ed2a7c7190c 257 if (IPH_V(iphdr) != 4) {
GordonSin 0:0ed2a7c7190c 258 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
GordonSin 0:0ed2a7c7190c 259 ip_debug_print(p);
GordonSin 0:0ed2a7c7190c 260 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 261 IP_STATS_INC(ip.err);
GordonSin 0:0ed2a7c7190c 262 IP_STATS_INC(ip.drop);
GordonSin 0:0ed2a7c7190c 263 snmp_inc_ipinhdrerrors();
GordonSin 0:0ed2a7c7190c 264 return ERR_OK;
GordonSin 0:0ed2a7c7190c 265 }
GordonSin 0:0ed2a7c7190c 266
GordonSin 0:0ed2a7c7190c 267 /* obtain IP header length in number of 32-bit words */
GordonSin 0:0ed2a7c7190c 268 iphdr_hlen = IPH_HL(iphdr);
GordonSin 0:0ed2a7c7190c 269 /* calculate IP header length in bytes */
GordonSin 0:0ed2a7c7190c 270 iphdr_hlen *= 4;
GordonSin 0:0ed2a7c7190c 271 /* obtain ip length in bytes */
GordonSin 0:0ed2a7c7190c 272 iphdr_len = ntohs(IPH_LEN(iphdr));
GordonSin 0:0ed2a7c7190c 273
GordonSin 0:0ed2a7c7190c 274 /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
GordonSin 0:0ed2a7c7190c 275 if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len)) {
GordonSin 0:0ed2a7c7190c 276 if (iphdr_hlen > p->len) {
GordonSin 0:0ed2a7c7190c 277 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
GordonSin 0:0ed2a7c7190c 278 ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
GordonSin 0:0ed2a7c7190c 279 iphdr_hlen, p->len));
GordonSin 0:0ed2a7c7190c 280 }
GordonSin 0:0ed2a7c7190c 281 if (iphdr_len > p->tot_len) {
GordonSin 0:0ed2a7c7190c 282 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
GordonSin 0:0ed2a7c7190c 283 ("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
GordonSin 0:0ed2a7c7190c 284 iphdr_len, p->tot_len));
GordonSin 0:0ed2a7c7190c 285 }
GordonSin 0:0ed2a7c7190c 286 /* free (drop) packet pbufs */
GordonSin 0:0ed2a7c7190c 287 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 288 IP_STATS_INC(ip.lenerr);
GordonSin 0:0ed2a7c7190c 289 IP_STATS_INC(ip.drop);
GordonSin 0:0ed2a7c7190c 290 snmp_inc_ipindiscards();
GordonSin 0:0ed2a7c7190c 291 return ERR_OK;
GordonSin 0:0ed2a7c7190c 292 }
GordonSin 0:0ed2a7c7190c 293
GordonSin 0:0ed2a7c7190c 294 /* verify checksum */
GordonSin 0:0ed2a7c7190c 295 #if CHECKSUM_CHECK_IP
GordonSin 0:0ed2a7c7190c 296 if (inet_chksum(iphdr, iphdr_hlen) != 0) {
GordonSin 0:0ed2a7c7190c 297
GordonSin 0:0ed2a7c7190c 298 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
GordonSin 0:0ed2a7c7190c 299 ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
GordonSin 0:0ed2a7c7190c 300 ip_debug_print(p);
GordonSin 0:0ed2a7c7190c 301 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 302 IP_STATS_INC(ip.chkerr);
GordonSin 0:0ed2a7c7190c 303 IP_STATS_INC(ip.drop);
GordonSin 0:0ed2a7c7190c 304 snmp_inc_ipinhdrerrors();
GordonSin 0:0ed2a7c7190c 305 return ERR_OK;
GordonSin 0:0ed2a7c7190c 306 }
GordonSin 0:0ed2a7c7190c 307 #endif
GordonSin 0:0ed2a7c7190c 308
GordonSin 0:0ed2a7c7190c 309 /* Trim pbuf. This should have been done at the netif layer,
GordonSin 0:0ed2a7c7190c 310 * but we'll do it anyway just to be sure that its done. */
GordonSin 0:0ed2a7c7190c 311 pbuf_realloc(p, iphdr_len);
GordonSin 0:0ed2a7c7190c 312
GordonSin 0:0ed2a7c7190c 313 /* copy IP addresses to aligned ip_addr_t */
GordonSin 0:0ed2a7c7190c 314 ip_addr_copy(current_iphdr_dest, iphdr->dest);
GordonSin 0:0ed2a7c7190c 315 ip_addr_copy(current_iphdr_src, iphdr->src);
GordonSin 0:0ed2a7c7190c 316
GordonSin 0:0ed2a7c7190c 317 /* match packet against an interface, i.e. is this packet for us? */
GordonSin 0:0ed2a7c7190c 318 #if LWIP_IGMP
GordonSin 0:0ed2a7c7190c 319 if (ip_addr_ismulticast(&current_iphdr_dest)) {
GordonSin 0:0ed2a7c7190c 320 if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &current_iphdr_dest))) {
GordonSin 0:0ed2a7c7190c 321 netif = inp;
GordonSin 0:0ed2a7c7190c 322 } else {
GordonSin 0:0ed2a7c7190c 323 netif = NULL;
GordonSin 0:0ed2a7c7190c 324 }
GordonSin 0:0ed2a7c7190c 325 } else
GordonSin 0:0ed2a7c7190c 326 #endif /* LWIP_IGMP */
GordonSin 0:0ed2a7c7190c 327 {
GordonSin 0:0ed2a7c7190c 328 /* start trying with inp. if that's not acceptable, start walking the
GordonSin 0:0ed2a7c7190c 329 list of configured netifs.
GordonSin 0:0ed2a7c7190c 330 'first' is used as a boolean to mark whether we started walking the list */
GordonSin 0:0ed2a7c7190c 331 int first = 1;
GordonSin 0:0ed2a7c7190c 332 netif = inp;
GordonSin 0:0ed2a7c7190c 333 do {
GordonSin 0:0ed2a7c7190c 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",
GordonSin 0:0ed2a7c7190c 335 ip4_addr_get_u32(&iphdr->dest), ip4_addr_get_u32(&netif->ip_addr),
GordonSin 0:0ed2a7c7190c 336 ip4_addr_get_u32(&iphdr->dest) & ip4_addr_get_u32(&netif->netmask),
GordonSin 0:0ed2a7c7190c 337 ip4_addr_get_u32(&netif->ip_addr) & ip4_addr_get_u32(&netif->netmask),
GordonSin 0:0ed2a7c7190c 338 ip4_addr_get_u32(&iphdr->dest) & ~ip4_addr_get_u32(&netif->netmask)));
GordonSin 0:0ed2a7c7190c 339
GordonSin 0:0ed2a7c7190c 340 /* interface is up and configured? */
GordonSin 0:0ed2a7c7190c 341 if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
GordonSin 0:0ed2a7c7190c 342 /* unicast to this interface address? */
GordonSin 0:0ed2a7c7190c 343 if (ip_addr_cmp(&current_iphdr_dest, &(netif->ip_addr)) ||
GordonSin 0:0ed2a7c7190c 344 /* or broadcast on this interface network address? */
GordonSin 0:0ed2a7c7190c 345 ip_addr_isbroadcast(&current_iphdr_dest, netif)) {
GordonSin 0:0ed2a7c7190c 346 LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
GordonSin 0:0ed2a7c7190c 347 netif->name[0], netif->name[1]));
GordonSin 0:0ed2a7c7190c 348 /* break out of for loop */
GordonSin 0:0ed2a7c7190c 349 break;
GordonSin 0:0ed2a7c7190c 350 }
GordonSin 0:0ed2a7c7190c 351 #if LWIP_AUTOIP
GordonSin 0:0ed2a7c7190c 352 /* connections to link-local addresses must persist after changing
GordonSin 0:0ed2a7c7190c 353 the netif's address (RFC3927 ch. 1.9) */
GordonSin 0:0ed2a7c7190c 354 if ((netif->autoip != NULL) &&
GordonSin 0:0ed2a7c7190c 355 ip_addr_cmp(&current_iphdr_dest, &(netif->autoip->llipaddr))) {
GordonSin 0:0ed2a7c7190c 356 LWIP_DEBUGF(IP_DEBUG, ("ip_input: LLA packet accepted on interface %c%c\n",
GordonSin 0:0ed2a7c7190c 357 netif->name[0], netif->name[1]));
GordonSin 0:0ed2a7c7190c 358 /* break out of for loop */
GordonSin 0:0ed2a7c7190c 359 break;
GordonSin 0:0ed2a7c7190c 360 }
GordonSin 0:0ed2a7c7190c 361 #endif /* LWIP_AUTOIP */
GordonSin 0:0ed2a7c7190c 362 }
GordonSin 0:0ed2a7c7190c 363 if (first) {
GordonSin 0:0ed2a7c7190c 364 first = 0;
GordonSin 0:0ed2a7c7190c 365 netif = netif_list;
GordonSin 0:0ed2a7c7190c 366 } else {
GordonSin 0:0ed2a7c7190c 367 netif = netif->next;
GordonSin 0:0ed2a7c7190c 368 }
GordonSin 0:0ed2a7c7190c 369 if (netif == inp) {
GordonSin 0:0ed2a7c7190c 370 netif = netif->next;
GordonSin 0:0ed2a7c7190c 371 }
GordonSin 0:0ed2a7c7190c 372 } while(netif != NULL);
GordonSin 0:0ed2a7c7190c 373 }
GordonSin 0:0ed2a7c7190c 374
GordonSin 0:0ed2a7c7190c 375 #if IP_ACCEPT_LINK_LAYER_ADDRESSING
GordonSin 0:0ed2a7c7190c 376 /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
GordonSin 0:0ed2a7c7190c 377 * using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
GordonSin 0:0ed2a7c7190c 378 * According to RFC 1542 section 3.1.1, referred by RFC 2131).
GordonSin 0:0ed2a7c7190c 379 *
GordonSin 0:0ed2a7c7190c 380 * If you want to accept private broadcast communication while a netif is down,
GordonSin 0:0ed2a7c7190c 381 * define LWIP_IP_ACCEPT_UDP_PORT(dst_port), e.g.:
GordonSin 0:0ed2a7c7190c 382 *
GordonSin 0:0ed2a7c7190c 383 * #define LWIP_IP_ACCEPT_UDP_PORT(dst_port) ((dst_port) == PP_NTOHS(12345))
GordonSin 0:0ed2a7c7190c 384 */
GordonSin 0:0ed2a7c7190c 385 if (netif == NULL) {
GordonSin 0:0ed2a7c7190c 386 /* remote port is DHCP server? */
GordonSin 0:0ed2a7c7190c 387 if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
GordonSin 0:0ed2a7c7190c 388 struct udp_hdr *udphdr = (struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen);
GordonSin 0:0ed2a7c7190c 389 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
GordonSin 0:0ed2a7c7190c 390 ntohs(udphdr->dest)));
GordonSin 0:0ed2a7c7190c 391 if (IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(udphdr->dest)) {
GordonSin 0:0ed2a7c7190c 392 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: DHCP packet accepted.\n"));
GordonSin 0:0ed2a7c7190c 393 netif = inp;
GordonSin 0:0ed2a7c7190c 394 check_ip_src = 0;
GordonSin 0:0ed2a7c7190c 395 }
GordonSin 0:0ed2a7c7190c 396 }
GordonSin 0:0ed2a7c7190c 397 }
GordonSin 0:0ed2a7c7190c 398 #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
GordonSin 0:0ed2a7c7190c 399
GordonSin 0:0ed2a7c7190c 400 /* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
GordonSin 0:0ed2a7c7190c 401 #if IP_ACCEPT_LINK_LAYER_ADDRESSING
GordonSin 0:0ed2a7c7190c 402 /* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
GordonSin 0:0ed2a7c7190c 403 if (check_ip_src && !ip_addr_isany(&current_iphdr_src))
GordonSin 0:0ed2a7c7190c 404 #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
GordonSin 0:0ed2a7c7190c 405 { if ((ip_addr_isbroadcast(&current_iphdr_src, inp)) ||
GordonSin 0:0ed2a7c7190c 406 (ip_addr_ismulticast(&current_iphdr_src))) {
GordonSin 0:0ed2a7c7190c 407 /* packet source is not valid */
GordonSin 0:0ed2a7c7190c 408 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("ip_input: packet source is not valid.\n"));
GordonSin 0:0ed2a7c7190c 409 /* free (drop) packet pbufs */
GordonSin 0:0ed2a7c7190c 410 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 411 IP_STATS_INC(ip.drop);
GordonSin 0:0ed2a7c7190c 412 snmp_inc_ipinaddrerrors();
GordonSin 0:0ed2a7c7190c 413 snmp_inc_ipindiscards();
GordonSin 0:0ed2a7c7190c 414 return ERR_OK;
GordonSin 0:0ed2a7c7190c 415 }
GordonSin 0:0ed2a7c7190c 416 }
GordonSin 0:0ed2a7c7190c 417
GordonSin 0:0ed2a7c7190c 418 /* packet not for us? */
GordonSin 0:0ed2a7c7190c 419 if (netif == NULL) {
GordonSin 0:0ed2a7c7190c 420 /* packet not for us, route or discard */
GordonSin 0:0ed2a7c7190c 421 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: packet not for us.\n"));
GordonSin 0:0ed2a7c7190c 422 #if IP_FORWARD
GordonSin 0:0ed2a7c7190c 423 /* non-broadcast packet? */
GordonSin 0:0ed2a7c7190c 424 if (!ip_addr_isbroadcast(&current_iphdr_dest, inp)) {
GordonSin 0:0ed2a7c7190c 425 /* try to forward IP packet on (other) interfaces */
GordonSin 0:0ed2a7c7190c 426 ip_forward(p, iphdr, inp);
GordonSin 0:0ed2a7c7190c 427 } else
GordonSin 0:0ed2a7c7190c 428 #endif /* IP_FORWARD */
GordonSin 0:0ed2a7c7190c 429 {
GordonSin 0:0ed2a7c7190c 430 snmp_inc_ipinaddrerrors();
GordonSin 0:0ed2a7c7190c 431 snmp_inc_ipindiscards();
GordonSin 0:0ed2a7c7190c 432 }
GordonSin 0:0ed2a7c7190c 433 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 434 return ERR_OK;
GordonSin 0:0ed2a7c7190c 435 }
GordonSin 0:0ed2a7c7190c 436 /* packet consists of multiple fragments? */
GordonSin 0:0ed2a7c7190c 437 if ((IPH_OFFSET(iphdr) & PP_HTONS(IP_OFFMASK | IP_MF)) != 0) {
GordonSin 0:0ed2a7c7190c 438 #if IP_REASSEMBLY /* packet fragment reassembly code present? */
GordonSin 0:0ed2a7c7190c 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",
GordonSin 0:0ed2a7c7190c 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));
GordonSin 0:0ed2a7c7190c 441 /* reassemble the packet*/
GordonSin 0:0ed2a7c7190c 442 p = ip_reass(p);
GordonSin 0:0ed2a7c7190c 443 /* packet not fully reassembled yet? */
GordonSin 0:0ed2a7c7190c 444 if (p == NULL) {
GordonSin 0:0ed2a7c7190c 445 return ERR_OK;
GordonSin 0:0ed2a7c7190c 446 }
GordonSin 0:0ed2a7c7190c 447 iphdr = (struct ip_hdr *)p->payload;
GordonSin 0:0ed2a7c7190c 448 #else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
GordonSin 0:0ed2a7c7190c 449 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 450 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
GordonSin 0:0ed2a7c7190c 451 ntohs(IPH_OFFSET(iphdr))));
GordonSin 0:0ed2a7c7190c 452 IP_STATS_INC(ip.opterr);
GordonSin 0:0ed2a7c7190c 453 IP_STATS_INC(ip.drop);
GordonSin 0:0ed2a7c7190c 454 /* unsupported protocol feature */
GordonSin 0:0ed2a7c7190c 455 snmp_inc_ipinunknownprotos();
GordonSin 0:0ed2a7c7190c 456 return ERR_OK;
GordonSin 0:0ed2a7c7190c 457 #endif /* IP_REASSEMBLY */
GordonSin 0:0ed2a7c7190c 458 }
GordonSin 0:0ed2a7c7190c 459
GordonSin 0:0ed2a7c7190c 460 #if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
GordonSin 0:0ed2a7c7190c 461
GordonSin 0:0ed2a7c7190c 462 #if LWIP_IGMP
GordonSin 0:0ed2a7c7190c 463 /* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
GordonSin 0:0ed2a7c7190c 464 if((iphdr_hlen > IP_HLEN) && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
GordonSin 0:0ed2a7c7190c 465 #else
GordonSin 0:0ed2a7c7190c 466 if (iphdr_hlen > IP_HLEN) {
GordonSin 0:0ed2a7c7190c 467 #endif /* LWIP_IGMP */
GordonSin 0:0ed2a7c7190c 468 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
GordonSin 0:0ed2a7c7190c 469 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 470 IP_STATS_INC(ip.opterr);
GordonSin 0:0ed2a7c7190c 471 IP_STATS_INC(ip.drop);
GordonSin 0:0ed2a7c7190c 472 /* unsupported protocol feature */
GordonSin 0:0ed2a7c7190c 473 snmp_inc_ipinunknownprotos();
GordonSin 0:0ed2a7c7190c 474 return ERR_OK;
GordonSin 0:0ed2a7c7190c 475 }
GordonSin 0:0ed2a7c7190c 476 #endif /* IP_OPTIONS_ALLOWED == 0 */
GordonSin 0:0ed2a7c7190c 477
GordonSin 0:0ed2a7c7190c 478 /* send to upper layers */
GordonSin 0:0ed2a7c7190c 479 LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
GordonSin 0:0ed2a7c7190c 480 ip_debug_print(p);
GordonSin 0:0ed2a7c7190c 481 LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
GordonSin 0:0ed2a7c7190c 482
GordonSin 0:0ed2a7c7190c 483 current_netif = inp;
GordonSin 0:0ed2a7c7190c 484 current_header = iphdr;
GordonSin 0:0ed2a7c7190c 485
GordonSin 0:0ed2a7c7190c 486 #if LWIP_RAW
GordonSin 0:0ed2a7c7190c 487 /* raw input did not eat the packet? */
GordonSin 0:0ed2a7c7190c 488 if (raw_input(p, inp) == 0)
GordonSin 0:0ed2a7c7190c 489 #endif /* LWIP_RAW */
GordonSin 0:0ed2a7c7190c 490 {
GordonSin 0:0ed2a7c7190c 491
GordonSin 0:0ed2a7c7190c 492 switch (IPH_PROTO(iphdr)) {
GordonSin 0:0ed2a7c7190c 493 #if LWIP_UDP
GordonSin 0:0ed2a7c7190c 494 case IP_PROTO_UDP:
GordonSin 0:0ed2a7c7190c 495 #if LWIP_UDPLITE
GordonSin 0:0ed2a7c7190c 496 case IP_PROTO_UDPLITE:
GordonSin 0:0ed2a7c7190c 497 #endif /* LWIP_UDPLITE */
GordonSin 0:0ed2a7c7190c 498 snmp_inc_ipindelivers();
GordonSin 0:0ed2a7c7190c 499 udp_input(p, inp);
GordonSin 0:0ed2a7c7190c 500 break;
GordonSin 0:0ed2a7c7190c 501 #endif /* LWIP_UDP */
GordonSin 0:0ed2a7c7190c 502 #if LWIP_TCP
GordonSin 0:0ed2a7c7190c 503 case IP_PROTO_TCP:
GordonSin 0:0ed2a7c7190c 504 snmp_inc_ipindelivers();
GordonSin 0:0ed2a7c7190c 505 tcp_input(p, inp);
GordonSin 0:0ed2a7c7190c 506 break;
GordonSin 0:0ed2a7c7190c 507 #endif /* LWIP_TCP */
GordonSin 0:0ed2a7c7190c 508 #if LWIP_ICMP
GordonSin 0:0ed2a7c7190c 509 case IP_PROTO_ICMP:
GordonSin 0:0ed2a7c7190c 510 snmp_inc_ipindelivers();
GordonSin 0:0ed2a7c7190c 511 icmp_input(p, inp);
GordonSin 0:0ed2a7c7190c 512 break;
GordonSin 0:0ed2a7c7190c 513 #endif /* LWIP_ICMP */
GordonSin 0:0ed2a7c7190c 514 #if LWIP_IGMP
GordonSin 0:0ed2a7c7190c 515 case IP_PROTO_IGMP:
GordonSin 0:0ed2a7c7190c 516 igmp_input(p, inp, &current_iphdr_dest);
GordonSin 0:0ed2a7c7190c 517 break;
GordonSin 0:0ed2a7c7190c 518 #endif /* LWIP_IGMP */
GordonSin 0:0ed2a7c7190c 519 default:
GordonSin 0:0ed2a7c7190c 520 #if LWIP_ICMP
GordonSin 0:0ed2a7c7190c 521 /* send ICMP destination protocol unreachable unless is was a broadcast */
GordonSin 0:0ed2a7c7190c 522 if (!ip_addr_isbroadcast(&current_iphdr_dest, inp) &&
GordonSin 0:0ed2a7c7190c 523 !ip_addr_ismulticast(&current_iphdr_dest)) {
GordonSin 0:0ed2a7c7190c 524 p->payload = iphdr;
GordonSin 0:0ed2a7c7190c 525 icmp_dest_unreach(p, ICMP_DUR_PROTO);
GordonSin 0:0ed2a7c7190c 526 }
GordonSin 0:0ed2a7c7190c 527 #endif /* LWIP_ICMP */
GordonSin 0:0ed2a7c7190c 528 pbuf_free(p);
GordonSin 0:0ed2a7c7190c 529
GordonSin 0:0ed2a7c7190c 530 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
GordonSin 0:0ed2a7c7190c 531
GordonSin 0:0ed2a7c7190c 532 IP_STATS_INC(ip.proterr);
GordonSin 0:0ed2a7c7190c 533 IP_STATS_INC(ip.drop);
GordonSin 0:0ed2a7c7190c 534 snmp_inc_ipinunknownprotos();
GordonSin 0:0ed2a7c7190c 535 }
GordonSin 0:0ed2a7c7190c 536 }
GordonSin 0:0ed2a7c7190c 537
GordonSin 0:0ed2a7c7190c 538 current_netif = NULL;
GordonSin 0:0ed2a7c7190c 539 current_header = NULL;
GordonSin 0:0ed2a7c7190c 540 ip_addr_set_any(&current_iphdr_src);
GordonSin 0:0ed2a7c7190c 541 ip_addr_set_any(&current_iphdr_dest);
GordonSin 0:0ed2a7c7190c 542
GordonSin 0:0ed2a7c7190c 543 return ERR_OK;
GordonSin 0:0ed2a7c7190c 544 }
GordonSin 0:0ed2a7c7190c 545
GordonSin 0:0ed2a7c7190c 546 /**
GordonSin 0:0ed2a7c7190c 547 * Sends an IP packet on a network interface. This function constructs
GordonSin 0:0ed2a7c7190c 548 * the IP header and calculates the IP header checksum. If the source
GordonSin 0:0ed2a7c7190c 549 * IP address is NULL, the IP address of the outgoing network
GordonSin 0:0ed2a7c7190c 550 * interface is filled in as source address.
GordonSin 0:0ed2a7c7190c 551 * If the destination IP address is IP_HDRINCL, p is assumed to already
GordonSin 0:0ed2a7c7190c 552 * include an IP header and p->payload points to it instead of the data.
GordonSin 0:0ed2a7c7190c 553 *
GordonSin 0:0ed2a7c7190c 554 * @param p the packet to send (p->payload points to the data, e.g. next
GordonSin 0:0ed2a7c7190c 555 protocol header; if dest == IP_HDRINCL, p already includes an IP
GordonSin 0:0ed2a7c7190c 556 header and p->payload points to that IP header)
GordonSin 0:0ed2a7c7190c 557 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
GordonSin 0:0ed2a7c7190c 558 * IP address of the netif used to send is used as source address)
GordonSin 0:0ed2a7c7190c 559 * @param dest the destination IP address to send the packet to
GordonSin 0:0ed2a7c7190c 560 * @param ttl the TTL value to be set in the IP header
GordonSin 0:0ed2a7c7190c 561 * @param tos the TOS value to be set in the IP header
GordonSin 0:0ed2a7c7190c 562 * @param proto the PROTOCOL to be set in the IP header
GordonSin 0:0ed2a7c7190c 563 * @param netif the netif on which to send this packet
GordonSin 0:0ed2a7c7190c 564 * @return ERR_OK if the packet was sent OK
GordonSin 0:0ed2a7c7190c 565 * ERR_BUF if p doesn't have enough space for IP/LINK headers
GordonSin 0:0ed2a7c7190c 566 * returns errors returned by netif->output
GordonSin 0:0ed2a7c7190c 567 *
GordonSin 0:0ed2a7c7190c 568 * @note ip_id: RFC791 "some host may be able to simply use
GordonSin 0:0ed2a7c7190c 569 * unique identifiers independent of destination"
GordonSin 0:0ed2a7c7190c 570 */
GordonSin 0:0ed2a7c7190c 571 err_t
GordonSin 0:0ed2a7c7190c 572 ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
GordonSin 0:0ed2a7c7190c 573 u8_t ttl, u8_t tos,
GordonSin 0:0ed2a7c7190c 574 u8_t proto, struct netif *netif)
GordonSin 0:0ed2a7c7190c 575 {
GordonSin 0:0ed2a7c7190c 576 #if IP_OPTIONS_SEND
GordonSin 0:0ed2a7c7190c 577 return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
GordonSin 0:0ed2a7c7190c 578 }
GordonSin 0:0ed2a7c7190c 579
GordonSin 0:0ed2a7c7190c 580 /**
GordonSin 0:0ed2a7c7190c 581 * Same as ip_output_if() but with the possibility to include IP options:
GordonSin 0:0ed2a7c7190c 582 *
GordonSin 0:0ed2a7c7190c 583 * @ param ip_options pointer to the IP options, copied into the IP header
GordonSin 0:0ed2a7c7190c 584 * @ param optlen length of ip_options
GordonSin 0:0ed2a7c7190c 585 */
GordonSin 0:0ed2a7c7190c 586 err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
GordonSin 0:0ed2a7c7190c 587 u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
GordonSin 0:0ed2a7c7190c 588 u16_t optlen)
GordonSin 0:0ed2a7c7190c 589 {
GordonSin 0:0ed2a7c7190c 590 #endif /* IP_OPTIONS_SEND */
GordonSin 0:0ed2a7c7190c 591 struct ip_hdr *iphdr;
GordonSin 0:0ed2a7c7190c 592 ip_addr_t dest_addr;
GordonSin 0:0ed2a7c7190c 593 #if CHECKSUM_GEN_IP_INLINE
GordonSin 0:0ed2a7c7190c 594 u32_t chk_sum = 0;
GordonSin 0:0ed2a7c7190c 595 #endif /* CHECKSUM_GEN_IP_INLINE */
GordonSin 0:0ed2a7c7190c 596
GordonSin 0:0ed2a7c7190c 597 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
GordonSin 0:0ed2a7c7190c 598 gets altered as the packet is passed down the stack */
GordonSin 0:0ed2a7c7190c 599 LWIP_ASSERT("p->ref == 1", p->ref == 1);
GordonSin 0:0ed2a7c7190c 600
GordonSin 0:0ed2a7c7190c 601 snmp_inc_ipoutrequests();
GordonSin 0:0ed2a7c7190c 602
GordonSin 0:0ed2a7c7190c 603 /* Should the IP header be generated or is it already included in p? */
GordonSin 0:0ed2a7c7190c 604 if (dest != IP_HDRINCL) {
GordonSin 0:0ed2a7c7190c 605 u16_t ip_hlen = IP_HLEN;
GordonSin 0:0ed2a7c7190c 606 #if IP_OPTIONS_SEND
GordonSin 0:0ed2a7c7190c 607 u16_t optlen_aligned = 0;
GordonSin 0:0ed2a7c7190c 608 if (optlen != 0) {
GordonSin 0:0ed2a7c7190c 609 #if CHECKSUM_GEN_IP_INLINE
GordonSin 0:0ed2a7c7190c 610 int i;
GordonSin 0:0ed2a7c7190c 611 #endif /* CHECKSUM_GEN_IP_INLINE */
GordonSin 0:0ed2a7c7190c 612 /* round up to a multiple of 4 */
GordonSin 0:0ed2a7c7190c 613 optlen_aligned = ((optlen + 3) & ~3);
GordonSin 0:0ed2a7c7190c 614 ip_hlen += optlen_aligned;
GordonSin 0:0ed2a7c7190c 615 /* First write in the IP options */
GordonSin 0:0ed2a7c7190c 616 if (pbuf_header(p, optlen_aligned)) {
GordonSin 0:0ed2a7c7190c 617 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
GordonSin 0:0ed2a7c7190c 618 IP_STATS_INC(ip.err);
GordonSin 0:0ed2a7c7190c 619 snmp_inc_ipoutdiscards();
GordonSin 0:0ed2a7c7190c 620 return ERR_BUF;
GordonSin 0:0ed2a7c7190c 621 }
GordonSin 0:0ed2a7c7190c 622 MEMCPY(p->payload, ip_options, optlen);
GordonSin 0:0ed2a7c7190c 623 if (optlen < optlen_aligned) {
GordonSin 0:0ed2a7c7190c 624 /* zero the remaining bytes */
GordonSin 0:0ed2a7c7190c 625 memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
GordonSin 0:0ed2a7c7190c 626 }
GordonSin 0:0ed2a7c7190c 627 #if CHECKSUM_GEN_IP_INLINE
GordonSin 0:0ed2a7c7190c 628 for (i = 0; i < optlen_aligned/2; i++) {
GordonSin 0:0ed2a7c7190c 629 chk_sum += ((u16_t*)p->payload)[i];
GordonSin 0:0ed2a7c7190c 630 }
GordonSin 0:0ed2a7c7190c 631 #endif /* CHECKSUM_GEN_IP_INLINE */
GordonSin 0:0ed2a7c7190c 632 }
GordonSin 0:0ed2a7c7190c 633 #endif /* IP_OPTIONS_SEND */
GordonSin 0:0ed2a7c7190c 634 /* generate IP header */
GordonSin 0:0ed2a7c7190c 635 if (pbuf_header(p, IP_HLEN)) {
GordonSin 0:0ed2a7c7190c 636 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output: not enough room for IP header in pbuf\n"));
GordonSin 0:0ed2a7c7190c 637
GordonSin 0:0ed2a7c7190c 638 IP_STATS_INC(ip.err);
GordonSin 0:0ed2a7c7190c 639 snmp_inc_ipoutdiscards();
GordonSin 0:0ed2a7c7190c 640 return ERR_BUF;
GordonSin 0:0ed2a7c7190c 641 }
GordonSin 0:0ed2a7c7190c 642
GordonSin 0:0ed2a7c7190c 643 iphdr = (struct ip_hdr *)p->payload;
GordonSin 0:0ed2a7c7190c 644 LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
GordonSin 0:0ed2a7c7190c 645 (p->len >= sizeof(struct ip_hdr)));
GordonSin 0:0ed2a7c7190c 646
GordonSin 0:0ed2a7c7190c 647 IPH_TTL_SET(iphdr, ttl);
GordonSin 0:0ed2a7c7190c 648 IPH_PROTO_SET(iphdr, proto);
GordonSin 0:0ed2a7c7190c 649 #if CHECKSUM_GEN_IP_INLINE
GordonSin 0:0ed2a7c7190c 650 chk_sum += LWIP_MAKE_U16(proto, ttl);
GordonSin 0:0ed2a7c7190c 651 #endif /* CHECKSUM_GEN_IP_INLINE */
GordonSin 0:0ed2a7c7190c 652
GordonSin 0:0ed2a7c7190c 653 /* dest cannot be NULL here */
GordonSin 0:0ed2a7c7190c 654 ip_addr_copy(iphdr->dest, *dest);
GordonSin 0:0ed2a7c7190c 655 #if CHECKSUM_GEN_IP_INLINE
GordonSin 0:0ed2a7c7190c 656 chk_sum += ip4_addr_get_u32(&iphdr->dest) & 0xFFFF;
GordonSin 0:0ed2a7c7190c 657 chk_sum += ip4_addr_get_u32(&iphdr->dest) >> 16;
GordonSin 0:0ed2a7c7190c 658 #endif /* CHECKSUM_GEN_IP_INLINE */
GordonSin 0:0ed2a7c7190c 659
GordonSin 0:0ed2a7c7190c 660 IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
GordonSin 0:0ed2a7c7190c 661 #if CHECKSUM_GEN_IP_INLINE
GordonSin 0:0ed2a7c7190c 662 chk_sum += iphdr->_v_hl_tos;
GordonSin 0:0ed2a7c7190c 663 #endif /* CHECKSUM_GEN_IP_INLINE */
GordonSin 0:0ed2a7c7190c 664 IPH_LEN_SET(iphdr, htons(p->tot_len));
GordonSin 0:0ed2a7c7190c 665 #if CHECKSUM_GEN_IP_INLINE
GordonSin 0:0ed2a7c7190c 666 chk_sum += iphdr->_len;
GordonSin 0:0ed2a7c7190c 667 #endif /* CHECKSUM_GEN_IP_INLINE */
GordonSin 0:0ed2a7c7190c 668 IPH_OFFSET_SET(iphdr, 0);
GordonSin 0:0ed2a7c7190c 669 IPH_ID_SET(iphdr, htons(ip_id));
GordonSin 0:0ed2a7c7190c 670 #if CHECKSUM_GEN_IP_INLINE
GordonSin 0:0ed2a7c7190c 671 chk_sum += iphdr->_id;
GordonSin 0:0ed2a7c7190c 672 #endif /* CHECKSUM_GEN_IP_INLINE */
GordonSin 0:0ed2a7c7190c 673 ++ip_id;
GordonSin 0:0ed2a7c7190c 674
GordonSin 0:0ed2a7c7190c 675 if (ip_addr_isany(src)) {
GordonSin 0:0ed2a7c7190c 676 ip_addr_copy(iphdr->src, netif->ip_addr);
GordonSin 0:0ed2a7c7190c 677 } else {
GordonSin 0:0ed2a7c7190c 678 /* src cannot be NULL here */
GordonSin 0:0ed2a7c7190c 679 ip_addr_copy(iphdr->src, *src);
GordonSin 0:0ed2a7c7190c 680 }
GordonSin 0:0ed2a7c7190c 681
GordonSin 0:0ed2a7c7190c 682 #if CHECKSUM_GEN_IP_INLINE
GordonSin 0:0ed2a7c7190c 683 chk_sum += ip4_addr_get_u32(&iphdr->src) & 0xFFFF;
GordonSin 0:0ed2a7c7190c 684 chk_sum += ip4_addr_get_u32(&iphdr->src) >> 16;
GordonSin 0:0ed2a7c7190c 685 chk_sum = (chk_sum >> 16) + (chk_sum & 0xFFFF);
GordonSin 0:0ed2a7c7190c 686 chk_sum = (chk_sum >> 16) + chk_sum;
GordonSin 0:0ed2a7c7190c 687 chk_sum = ~chk_sum;
GordonSin 0:0ed2a7c7190c 688 iphdr->_chksum = chk_sum; /* network order */
GordonSin 0:0ed2a7c7190c 689 #else /* CHECKSUM_GEN_IP_INLINE */
GordonSin 0:0ed2a7c7190c 690 IPH_CHKSUM_SET(iphdr, 0);
GordonSin 0:0ed2a7c7190c 691 #if CHECKSUM_GEN_IP
GordonSin 0:0ed2a7c7190c 692 IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
GordonSin 0:0ed2a7c7190c 693 #endif
GordonSin 0:0ed2a7c7190c 694 #endif /* CHECKSUM_GEN_IP_INLINE */
GordonSin 0:0ed2a7c7190c 695 } else {
GordonSin 0:0ed2a7c7190c 696 /* IP header already included in p */
GordonSin 0:0ed2a7c7190c 697 iphdr = (struct ip_hdr *)p->payload;
GordonSin 0:0ed2a7c7190c 698 ip_addr_copy(dest_addr, iphdr->dest);
GordonSin 0:0ed2a7c7190c 699 dest = &dest_addr;
GordonSin 0:0ed2a7c7190c 700 }
GordonSin 0:0ed2a7c7190c 701
GordonSin 0:0ed2a7c7190c 702 IP_STATS_INC(ip.xmit);
GordonSin 0:0ed2a7c7190c 703
GordonSin 0:0ed2a7c7190c 704 LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
GordonSin 0:0ed2a7c7190c 705 ip_debug_print(p);
GordonSin 0:0ed2a7c7190c 706
GordonSin 0:0ed2a7c7190c 707 #if ENABLE_LOOPBACK
GordonSin 0:0ed2a7c7190c 708 if (ip_addr_cmp(dest, &netif->ip_addr)) {
GordonSin 0:0ed2a7c7190c 709 /* Packet to self, enqueue it for loopback */
GordonSin 0:0ed2a7c7190c 710 LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
GordonSin 0:0ed2a7c7190c 711 return netif_loop_output(netif, p, dest);
GordonSin 0:0ed2a7c7190c 712 }
GordonSin 0:0ed2a7c7190c 713 #if LWIP_IGMP
GordonSin 0:0ed2a7c7190c 714 if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) {
GordonSin 0:0ed2a7c7190c 715 netif_loop_output(netif, p, dest);
GordonSin 0:0ed2a7c7190c 716 }
GordonSin 0:0ed2a7c7190c 717 #endif /* LWIP_IGMP */
GordonSin 0:0ed2a7c7190c 718 #endif /* ENABLE_LOOPBACK */
GordonSin 0:0ed2a7c7190c 719 #if IP_FRAG
GordonSin 0:0ed2a7c7190c 720 /* don't fragment if interface has mtu set to 0 [loopif] */
GordonSin 0:0ed2a7c7190c 721 if (netif->mtu && (p->tot_len > netif->mtu)) {
GordonSin 0:0ed2a7c7190c 722 return ip_frag(p, netif, dest);
GordonSin 0:0ed2a7c7190c 723 }
GordonSin 0:0ed2a7c7190c 724 #endif /* IP_FRAG */
GordonSin 0:0ed2a7c7190c 725
GordonSin 0:0ed2a7c7190c 726 LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
GordonSin 0:0ed2a7c7190c 727 return netif->output(netif, p, dest);
GordonSin 0:0ed2a7c7190c 728 }
GordonSin 0:0ed2a7c7190c 729
GordonSin 0:0ed2a7c7190c 730 /**
GordonSin 0:0ed2a7c7190c 731 * Simple interface to ip_output_if. It finds the outgoing network
GordonSin 0:0ed2a7c7190c 732 * interface and calls upon ip_output_if to do the actual work.
GordonSin 0:0ed2a7c7190c 733 *
GordonSin 0:0ed2a7c7190c 734 * @param p the packet to send (p->payload points to the data, e.g. next
GordonSin 0:0ed2a7c7190c 735 protocol header; if dest == IP_HDRINCL, p already includes an IP
GordonSin 0:0ed2a7c7190c 736 header and p->payload points to that IP header)
GordonSin 0:0ed2a7c7190c 737 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
GordonSin 0:0ed2a7c7190c 738 * IP address of the netif used to send is used as source address)
GordonSin 0:0ed2a7c7190c 739 * @param dest the destination IP address to send the packet to
GordonSin 0:0ed2a7c7190c 740 * @param ttl the TTL value to be set in the IP header
GordonSin 0:0ed2a7c7190c 741 * @param tos the TOS value to be set in the IP header
GordonSin 0:0ed2a7c7190c 742 * @param proto the PROTOCOL to be set in the IP header
GordonSin 0:0ed2a7c7190c 743 *
GordonSin 0:0ed2a7c7190c 744 * @return ERR_RTE if no route is found
GordonSin 0:0ed2a7c7190c 745 * see ip_output_if() for more return values
GordonSin 0:0ed2a7c7190c 746 */
GordonSin 0:0ed2a7c7190c 747 err_t
GordonSin 0:0ed2a7c7190c 748 ip_output(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
GordonSin 0:0ed2a7c7190c 749 u8_t ttl, u8_t tos, u8_t proto)
GordonSin 0:0ed2a7c7190c 750 {
GordonSin 0:0ed2a7c7190c 751 struct netif *netif;
GordonSin 0:0ed2a7c7190c 752
GordonSin 0:0ed2a7c7190c 753 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
GordonSin 0:0ed2a7c7190c 754 gets altered as the packet is passed down the stack */
GordonSin 0:0ed2a7c7190c 755 LWIP_ASSERT("p->ref == 1", p->ref == 1);
GordonSin 0:0ed2a7c7190c 756
GordonSin 0:0ed2a7c7190c 757 if ((netif = ip_route(dest)) == NULL) {
GordonSin 0:0ed2a7c7190c 758 LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
GordonSin 0:0ed2a7c7190c 759 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
GordonSin 0:0ed2a7c7190c 760 IP_STATS_INC(ip.rterr);
GordonSin 0:0ed2a7c7190c 761 return ERR_RTE;
GordonSin 0:0ed2a7c7190c 762 }
GordonSin 0:0ed2a7c7190c 763
GordonSin 0:0ed2a7c7190c 764 return ip_output_if(p, src, dest, ttl, tos, proto, netif);
GordonSin 0:0ed2a7c7190c 765 }
GordonSin 0:0ed2a7c7190c 766
GordonSin 0:0ed2a7c7190c 767 #if LWIP_NETIF_HWADDRHINT
GordonSin 0:0ed2a7c7190c 768 /** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
GordonSin 0:0ed2a7c7190c 769 * before calling ip_output_if.
GordonSin 0:0ed2a7c7190c 770 *
GordonSin 0:0ed2a7c7190c 771 * @param p the packet to send (p->payload points to the data, e.g. next
GordonSin 0:0ed2a7c7190c 772 protocol header; if dest == IP_HDRINCL, p already includes an IP
GordonSin 0:0ed2a7c7190c 773 header and p->payload points to that IP header)
GordonSin 0:0ed2a7c7190c 774 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
GordonSin 0:0ed2a7c7190c 775 * IP address of the netif used to send is used as source address)
GordonSin 0:0ed2a7c7190c 776 * @param dest the destination IP address to send the packet to
GordonSin 0:0ed2a7c7190c 777 * @param ttl the TTL value to be set in the IP header
GordonSin 0:0ed2a7c7190c 778 * @param tos the TOS value to be set in the IP header
GordonSin 0:0ed2a7c7190c 779 * @param proto the PROTOCOL to be set in the IP header
GordonSin 0:0ed2a7c7190c 780 * @param addr_hint address hint pointer set to netif->addr_hint before
GordonSin 0:0ed2a7c7190c 781 * calling ip_output_if()
GordonSin 0:0ed2a7c7190c 782 *
GordonSin 0:0ed2a7c7190c 783 * @return ERR_RTE if no route is found
GordonSin 0:0ed2a7c7190c 784 * see ip_output_if() for more return values
GordonSin 0:0ed2a7c7190c 785 */
GordonSin 0:0ed2a7c7190c 786 err_t
GordonSin 0:0ed2a7c7190c 787 ip_output_hinted(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
GordonSin 0:0ed2a7c7190c 788 u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
GordonSin 0:0ed2a7c7190c 789 {
GordonSin 0:0ed2a7c7190c 790 struct netif *netif;
GordonSin 0:0ed2a7c7190c 791 err_t err;
GordonSin 0:0ed2a7c7190c 792
GordonSin 0:0ed2a7c7190c 793 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
GordonSin 0:0ed2a7c7190c 794 gets altered as the packet is passed down the stack */
GordonSin 0:0ed2a7c7190c 795 LWIP_ASSERT("p->ref == 1", p->ref == 1);
GordonSin 0:0ed2a7c7190c 796
GordonSin 0:0ed2a7c7190c 797 if ((netif = ip_route(dest)) == NULL) {
GordonSin 0:0ed2a7c7190c 798 LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
GordonSin 0:0ed2a7c7190c 799 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
GordonSin 0:0ed2a7c7190c 800 IP_STATS_INC(ip.rterr);
GordonSin 0:0ed2a7c7190c 801 return ERR_RTE;
GordonSin 0:0ed2a7c7190c 802 }
GordonSin 0:0ed2a7c7190c 803
GordonSin 0:0ed2a7c7190c 804 netif->addr_hint = addr_hint;
GordonSin 0:0ed2a7c7190c 805 err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
GordonSin 0:0ed2a7c7190c 806 netif->addr_hint = NULL;
GordonSin 0:0ed2a7c7190c 807
GordonSin 0:0ed2a7c7190c 808 return err;
GordonSin 0:0ed2a7c7190c 809 }
GordonSin 0:0ed2a7c7190c 810 #endif /* LWIP_NETIF_HWADDRHINT*/
GordonSin 0:0ed2a7c7190c 811
GordonSin 0:0ed2a7c7190c 812 #if IP_DEBUG
GordonSin 0:0ed2a7c7190c 813 /* Print an IP header by using LWIP_DEBUGF
GordonSin 0:0ed2a7c7190c 814 * @param p an IP packet, p->payload pointing to the IP header
GordonSin 0:0ed2a7c7190c 815 */
GordonSin 0:0ed2a7c7190c 816 void
GordonSin 0:0ed2a7c7190c 817 ip_debug_print(struct pbuf *p)
GordonSin 0:0ed2a7c7190c 818 {
GordonSin 0:0ed2a7c7190c 819 struct ip_hdr *iphdr = (struct ip_hdr *)p->payload;
GordonSin 0:0ed2a7c7190c 820 u8_t *payload;
GordonSin 0:0ed2a7c7190c 821
GordonSin 0:0ed2a7c7190c 822 payload = (u8_t *)iphdr + IP_HLEN;
GordonSin 0:0ed2a7c7190c 823
GordonSin 0:0ed2a7c7190c 824 LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
GordonSin 0:0ed2a7c7190c 825 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
GordonSin 0:0ed2a7c7190c 826 LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n",
GordonSin 0:0ed2a7c7190c 827 IPH_V(iphdr),
GordonSin 0:0ed2a7c7190c 828 IPH_HL(iphdr),
GordonSin 0:0ed2a7c7190c 829 IPH_TOS(iphdr),
GordonSin 0:0ed2a7c7190c 830 ntohs(IPH_LEN(iphdr))));
GordonSin 0:0ed2a7c7190c 831 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
GordonSin 0:0ed2a7c7190c 832 LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n",
GordonSin 0:0ed2a7c7190c 833 ntohs(IPH_ID(iphdr)),
GordonSin 0:0ed2a7c7190c 834 ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
GordonSin 0:0ed2a7c7190c 835 ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
GordonSin 0:0ed2a7c7190c 836 ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
GordonSin 0:0ed2a7c7190c 837 ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
GordonSin 0:0ed2a7c7190c 838 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
GordonSin 0:0ed2a7c7190c 839 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n",
GordonSin 0:0ed2a7c7190c 840 IPH_TTL(iphdr),
GordonSin 0:0ed2a7c7190c 841 IPH_PROTO(iphdr),
GordonSin 0:0ed2a7c7190c 842 ntohs(IPH_CHKSUM(iphdr))));
GordonSin 0:0ed2a7c7190c 843 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
GordonSin 0:0ed2a7c7190c 844 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n",
GordonSin 0:0ed2a7c7190c 845 ip4_addr1_16(&iphdr->src),
GordonSin 0:0ed2a7c7190c 846 ip4_addr2_16(&iphdr->src),
GordonSin 0:0ed2a7c7190c 847 ip4_addr3_16(&iphdr->src),
GordonSin 0:0ed2a7c7190c 848 ip4_addr4_16(&iphdr->src)));
GordonSin 0:0ed2a7c7190c 849 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
GordonSin 0:0ed2a7c7190c 850 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n",
GordonSin 0:0ed2a7c7190c 851 ip4_addr1_16(&iphdr->dest),
GordonSin 0:0ed2a7c7190c 852 ip4_addr2_16(&iphdr->dest),
GordonSin 0:0ed2a7c7190c 853 ip4_addr3_16(&iphdr->dest),
GordonSin 0:0ed2a7c7190c 854 ip4_addr4_16(&iphdr->dest)));
GordonSin 0:0ed2a7c7190c 855 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
GordonSin 0:0ed2a7c7190c 856 }
GordonSin 0:0ed2a7c7190c 857 #endif /* IP_DEBUG */