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1734f29721
These libraries are used only inside tcpip.sys driver so move them close to it.
398 lines
11 KiB
C
398 lines
11 KiB
C
/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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/* ip.c
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*
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* This is the code for the IP layer for IPv6.
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*
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*/
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#include "lwip/opt.h"
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#include "lwip/def.h"
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#include "lwip/mem.h"
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#include "lwip/ip.h"
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#include "lwip/inet.h"
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#include "lwip/netif.h"
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#include "lwip/icmp.h"
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#include "lwip/udp.h"
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#include "lwip/tcp_impl.h"
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#include "lwip/stats.h"
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#include "arch/perf.h"
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/* ip_init:
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*
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* Initializes the IP layer.
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*/
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void
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ip_init(void)
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{
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}
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/* ip_route:
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*
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* Finds the appropriate network interface for a given IP address. It searches the
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* list of network interfaces linearly. A match is found if the masked IP address of
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* the network interface equals the masked IP address given to the function.
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*/
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struct netif *
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ip_route(struct ip_addr *dest)
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{
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struct netif *netif;
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for(netif = netif_list; netif != NULL; netif = netif->next) {
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if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
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return netif;
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}
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}
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return netif_default;
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}
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/* ip_forward:
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*
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* Forwards an IP packet. It finds an appropriate route for the packet, decrements
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* the TTL value of the packet, adjusts the checksum and outputs the packet on the
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* appropriate interface.
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*/
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static void
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ip_forward(struct pbuf *p, struct ip_hdr *iphdr)
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{
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struct netif *netif;
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PERF_START;
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if ((netif = ip_route((struct ip_addr *)&(iphdr->dest))) == NULL) {
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LWIP_DEBUGF(IP_DEBUG, ("ip_input: no forwarding route found for "));
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#if IP_DEBUG
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ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
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#endif /* IP_DEBUG */
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LWIP_DEBUGF(IP_DEBUG, ("\n"));
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pbuf_free(p);
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return;
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}
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/* Decrement TTL and send ICMP if ttl == 0. */
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if (--iphdr->hoplim == 0) {
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#if LWIP_ICMP
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/* Don't send ICMP messages in response to ICMP messages */
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if (iphdr->nexthdr != IP_PROTO_ICMP) {
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icmp_time_exceeded(p, ICMP_TE_TTL);
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}
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#endif /* LWIP_ICMP */
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pbuf_free(p);
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return;
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}
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/* Incremental update of the IP checksum. */
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/* if (iphdr->chksum >= htons(0xffff - 0x100)) {
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iphdr->chksum += htons(0x100) + 1;
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} else {
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iphdr->chksum += htons(0x100);
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}*/
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LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to "));
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#if IP_DEBUG
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ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
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#endif /* IP_DEBUG */
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LWIP_DEBUGF(IP_DEBUG, ("\n"));
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IP_STATS_INC(ip.fw);
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IP_STATS_INC(ip.xmit);
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PERF_STOP("ip_forward");
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netif->output(netif, p, (struct ip_addr *)&(iphdr->dest));
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}
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/* ip_input:
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*
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* This function is called by the network interface device driver when an IP packet is
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* received. The function does the basic checks of the IP header such as packet size
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* being at least larger than the header size etc. If the packet was not destined for
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* us, the packet is forwarded (using ip_forward). The IP checksum is always checked.
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*
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* Finally, the packet is sent to the upper layer protocol input function.
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*/
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void
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ip_input(struct pbuf *p, struct netif *inp) {
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struct ip_hdr *iphdr;
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struct netif *netif;
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PERF_START;
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#if IP_DEBUG
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ip_debug_print(p);
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#endif /* IP_DEBUG */
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IP_STATS_INC(ip.recv);
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/* identify the IP header */
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iphdr = p->payload;
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if (iphdr->v != 6) {
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LWIP_DEBUGF(IP_DEBUG, ("IP packet dropped due to bad version number\n"));
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#if IP_DEBUG
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ip_debug_print(p);
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#endif /* IP_DEBUG */
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pbuf_free(p);
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IP_STATS_INC(ip.err);
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IP_STATS_INC(ip.drop);
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return;
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}
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/* is this packet for us? */
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for(netif = netif_list; netif != NULL; netif = netif->next) {
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#if IP_DEBUG
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LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest "));
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ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
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LWIP_DEBUGF(IP_DEBUG, ("netif->ip_addr "));
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ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
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LWIP_DEBUGF(IP_DEBUG, ("\n"));
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#endif /* IP_DEBUG */
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if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr))) {
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break;
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}
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}
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if (netif == NULL) {
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/* packet not for us, route or discard */
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#if IP_FORWARD
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ip_forward(p, iphdr);
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#endif
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pbuf_free(p);
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return;
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}
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pbuf_realloc(p, IP_HLEN + ntohs(iphdr->len));
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/* send to upper layers */
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#if IP_DEBUG
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/* LWIP_DEBUGF("ip_input: \n");
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ip_debug_print(p);
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LWIP_DEBUGF("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len);*/
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#endif /* IP_DEBUG */
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if(pbuf_header(p, -IP_HLEN)) {
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LWIP_ASSERT("Can't move over header in packet", 0);
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return;
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}
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switch (iphdr->nexthdr) {
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case IP_PROTO_UDP:
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udp_input(p, inp);
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break;
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case IP_PROTO_TCP:
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tcp_input(p, inp);
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break;
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#if LWIP_ICMP
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case IP_PROTO_ICMP:
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icmp_input(p, inp);
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break;
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#endif /* LWIP_ICMP */
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default:
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#if LWIP_ICMP
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/* send ICMP destination protocol unreachable */
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icmp_dest_unreach(p, ICMP_DUR_PROTO);
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#endif /* LWIP_ICMP */
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pbuf_free(p);
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LWIP_DEBUGF(IP_DEBUG, ("Unsupported transport protocol %"U16_F"\n",
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iphdr->nexthdr));
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IP_STATS_INC(ip.proterr);
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IP_STATS_INC(ip.drop);
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}
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PERF_STOP("ip_input");
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}
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/* ip_output_if:
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*
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* Sends an IP packet on a network interface. This function constructs the IP header
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* and calculates the IP header checksum. If the source IP address is NULL,
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* the IP address of the outgoing network interface is filled in as source address.
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*/
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err_t
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ip_output_if (struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
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u8_t ttl,
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u8_t proto, struct netif *netif)
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{
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struct ip_hdr *iphdr;
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PERF_START;
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LWIP_DEBUGF(IP_DEBUG, ("len %"U16_F" tot_len %"U16_F"\n", p->len, p->tot_len));
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if (pbuf_header(p, IP_HLEN)) {
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LWIP_DEBUGF(IP_DEBUG, ("ip_output: not enough room for IP header in pbuf\n"));
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IP_STATS_INC(ip.err);
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return ERR_BUF;
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}
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LWIP_DEBUGF(IP_DEBUG, ("len %"U16_F" tot_len %"U16_F"\n", p->len, p->tot_len));
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iphdr = p->payload;
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if (dest != IP_HDRINCL) {
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LWIP_DEBUGF(IP_DEBUG, ("!IP_HDRLINCL\n"));
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iphdr->hoplim = ttl;
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iphdr->nexthdr = proto;
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iphdr->len = htons(p->tot_len - IP_HLEN);
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ip_addr_set(&(iphdr->dest), dest);
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iphdr->v = 6;
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if (ip_addr_isany(src)) {
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ip_addr_set(&(iphdr->src), &(netif->ip_addr));
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} else {
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ip_addr_set(&(iphdr->src), src);
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}
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} else {
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dest = &(iphdr->dest);
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}
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IP_STATS_INC(ip.xmit);
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LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c (len %"U16_F")\n", netif->name[0], netif->name[1], p->tot_len));
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#if IP_DEBUG
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ip_debug_print(p);
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#endif /* IP_DEBUG */
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PERF_STOP("ip_output_if");
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return netif->output(netif, p, dest);
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}
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/* ip_output:
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*
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* Simple interface to ip_output_if. It finds the outgoing network interface and
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* calls upon ip_output_if to do the actual work.
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*/
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err_t
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ip_output(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
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u8_t ttl, u8_t proto)
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{
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struct netif *netif;
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if ((netif = ip_route(dest)) == NULL) {
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LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
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IP_STATS_INC(ip.rterr);
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return ERR_RTE;
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}
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return ip_output_if (p, src, dest, ttl, proto, netif);
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}
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#if LWIP_NETIF_HWADDRHINT
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err_t
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ip_output_hinted(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
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u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
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{
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struct netif *netif;
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err_t err;
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if ((netif = ip_route(dest)) == NULL) {
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LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
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IP_STATS_INC(ip.rterr);
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return ERR_RTE;
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}
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LWIP_NETIF_HWADDRHINT(netif, addr_hint);
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err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
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LWIP_NETIF_HWADDRHINT(netif, NULL);
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return err;
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}
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#endif /* LWIP_NETIF_HWADDRHINT*/
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#if IP_DEBUG
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void
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ip_debug_print(struct pbuf *p)
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{
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struct ip_hdr *iphdr = p->payload;
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LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
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LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" | %"X16_F"%"X16_F" | %"X16_F"%"X16_F" | (v, traffic class, flow label)\n",
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iphdr->v,
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iphdr->tclass1, iphdr->tclass2,
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iphdr->flow1, iphdr->flow2));
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LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" | %2"U16_F" | %2"U16_F" | (len, nexthdr, hoplim)\n",
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ntohs(iphdr->len),
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iphdr->nexthdr,
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iphdr->hoplim));
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LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (src)\n",
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(ntohl(iphdr->src.addr[0]) >> 16) & 0xffff,
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ntohl(iphdr->src.addr[0]) & 0xffff));
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LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (src)\n",
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(ntohl(iphdr->src.addr[1]) >> 16) & 0xffff,
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ntohl(iphdr->src.addr[1]) & 0xffff));
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LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (src)\n",
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(ntohl(iphdr->src.addr[2]) >> 16) & 0xffff,
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ntohl(iphdr->src.addr[2]) & 0xffff));
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LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (src)\n",
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(ntohl(iphdr->src.addr[3]) >> 16) & 0xffff,
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ntohl(iphdr->src.addr[3]) & 0xffff));
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LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (dest)\n",
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(ntohl(iphdr->dest.addr[0]) >> 16) & 0xffff,
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ntohl(iphdr->dest.addr[0]) & 0xffff));
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LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (dest)\n",
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(ntohl(iphdr->dest.addr[1]) >> 16) & 0xffff,
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ntohl(iphdr->dest.addr[1]) & 0xffff));
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LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (dest)\n",
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(ntohl(iphdr->dest.addr[2]) >> 16) & 0xffff,
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ntohl(iphdr->dest.addr[2]) & 0xffff));
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LWIP_DEBUGF(IP_DEBUG, ("| %4"X32_F" | %4"X32_F" | (dest)\n",
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(ntohl(iphdr->dest.addr[3]) >> 16) & 0xffff,
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ntohl(iphdr->dest.addr[3]) & 0xffff));
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LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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}
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#endif /* IP_DEBUG */
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