516 lines
16 KiB
C
516 lines
16 KiB
C
/* @file
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*
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* This is the IP layer implementation for incoming and outgoing IP traffic.
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*
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* @see ip_frag.c
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*
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*/
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/*
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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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#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/ip_frag.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/raw.h"
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#include "lwip/udp.h"
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#include "lwip/tcp.h"
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#include "lwip/stats.h"
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#include "arch/perf.h"
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#include "lwip/snmp.h"
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#if LWIP_DHCP
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# include "lwip/dhcp.h"
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#endif /* LWIP_DHCP */
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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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#if IP_FRAG
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ip_frag_init();
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#endif
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}
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/**
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* Finds the appropriate network interface for a given IP address. It
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* searches the list of network interfaces linearly. A match is found
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* if the masked IP address of the network interface equals the masked
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* 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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/* iterate through netifs */
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for(netif = netif_list; netif != NULL; netif = netif->next) {
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/* network mask matches? */
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if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
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/* return netif on which to forward IP packet */
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return netif;
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}
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}
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/* no matching netif found, use default netif */
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return netif_default;
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}
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#if IP_FORWARD
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/**
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* Forwards an IP packet. It finds an appropriate route for the
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* packet, decrements the TTL value of the packet, adjusts the
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* checksum and outputs the packet on the appropriate interface.
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*/
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static struct netif *
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ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
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{
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struct netif *netif;
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PERF_START;
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/* Find network interface where to forward this IP packet to. */
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netif = ip_route((struct ip_addr *)&(iphdr->dest));
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if (netif == NULL) {
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LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for 0x%"X32_F" found\n",
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iphdr->dest.addr));
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snmp_inc_ipoutnoroutes();
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return (struct netif *)NULL;
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}
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/* Do not forward packets onto the same network interface on which
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* they arrived. */
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if (netif == inp) {
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LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
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snmp_inc_ipoutnoroutes();
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return (struct netif *)NULL;
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}
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/* decrement TTL */
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IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
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/* send ICMP if TTL == 0 */
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if (IPH_TTL(iphdr) == 0) {
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snmp_inc_ipinhdrerrors();
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/* Don't send ICMP messages in response to ICMP messages */
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if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
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icmp_time_exceeded(p, ICMP_TE_TTL);
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}
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return (struct netif *)NULL;
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}
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/* Incrementally update the IP checksum. */
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if (IPH_CHKSUM(iphdr) >= htons(0xffff - 0x100)) {
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IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100) + 1);
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} else {
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IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100));
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}
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LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to 0x%"X32_F"\n",
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iphdr->dest.addr));
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IP_STATS_INC(ip.fw);
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IP_STATS_INC(ip.xmit);
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snmp_inc_ipforwdatagrams();
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PERF_STOP("ip_forward");
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/* transmit pbuf on chosen interface */
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netif->output(netif, p, (struct ip_addr *)&(iphdr->dest));
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return netif;
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}
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#endif /* IP_FORWARD */
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/**
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* This function is called by the network interface device driver when
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* an IP packet is received. The function does the basic checks of the
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* IP header such as packet size being at least larger than the header
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* size etc. If the packet was not destined for us, the packet is
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* 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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*
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*
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*/
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err_t
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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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u16_t iphdrlen;
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IP_STATS_INC(ip.recv);
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snmp_inc_ipinreceives();
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/* identify the IP header */
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iphdr = p->payload;
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if (IPH_V(iphdr) != 4) {
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LWIP_DEBUGF(IP_DEBUG | 1, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
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ip_debug_print(p);
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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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snmp_inc_ipinhdrerrors();
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return ERR_OK;
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}
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/* obtain IP header length in number of 32-bit words */
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iphdrlen = IPH_HL(iphdr);
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/* calculate IP header length in bytes */
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iphdrlen *= 4;
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/* header length exceeds first pbuf length? */
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if (iphdrlen > p->len) {
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LWIP_DEBUGF(IP_DEBUG | 2, ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet droppped.\n",
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iphdrlen, p->len));
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/* free (drop) packet pbufs */
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pbuf_free(p);
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IP_STATS_INC(ip.lenerr);
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IP_STATS_INC(ip.drop);
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snmp_inc_ipindiscards();
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return ERR_OK;
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}
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/* verify checksum */
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#if CHECKSUM_CHECK_IP
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if (inet_chksum(iphdr, iphdrlen) != 0) {
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LWIP_DEBUGF(IP_DEBUG | 2, ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdrlen)));
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ip_debug_print(p);
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pbuf_free(p);
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IP_STATS_INC(ip.chkerr);
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IP_STATS_INC(ip.drop);
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snmp_inc_ipinhdrerrors();
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return ERR_OK;
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}
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#endif
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/* Trim pbuf. This should have been done at the netif layer,
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* but we'll do it anyway just to be sure that its done. */
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pbuf_realloc(p, ntohs(IPH_LEN(iphdr)));
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/* match packet against an interface, i.e. is this packet for us? */
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for (netif = netif_list; netif != NULL; netif = netif->next) {
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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",
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iphdr->dest.addr, netif->ip_addr.addr,
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iphdr->dest.addr & netif->netmask.addr,
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netif->ip_addr.addr & netif->netmask.addr,
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iphdr->dest.addr & ~(netif->netmask.addr)));
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/* interface is up and configured? */
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if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr))))
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{
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/* unicast to this interface address? */
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if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
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/* or broadcast on this interface network address? */
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ip_addr_isbroadcast(&(iphdr->dest), netif)) {
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LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
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netif->name[0], netif->name[1]));
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/* break out of for loop */
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break;
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}
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}
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}
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#if LWIP_DHCP
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/* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
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* using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
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* According to RFC 1542 section 3.1.1, referred by RFC 2131).
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*/
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if (netif == NULL) {
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/* remote port is DHCP server? */
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if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
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LWIP_DEBUGF(IP_DEBUG | DBG_TRACE | 1, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
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ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdrlen))->dest)));
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if (ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdrlen))->dest) == DHCP_CLIENT_PORT) {
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LWIP_DEBUGF(IP_DEBUG | DBG_TRACE | 1, ("ip_input: DHCP packet accepted.\n"));
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netif = inp;
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}
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}
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}
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#endif /* LWIP_DHCP */
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/* packet not for us? */
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if (netif == NULL) {
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/* packet not for us, route or discard */
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LWIP_DEBUGF(IP_DEBUG | DBG_TRACE | 1, ("ip_input: packet not for us.\n"));
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#if IP_FORWARD
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/* non-broadcast packet? */
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if (!ip_addr_isbroadcast(&(iphdr->dest), inp)) {
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/* try to forward IP packet on (other) interfaces */
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ip_forward(p, iphdr, inp);
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}
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else
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#endif /* IP_FORWARD */
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{
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snmp_inc_ipinaddrerrors();
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snmp_inc_ipindiscards();
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}
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pbuf_free(p);
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return ERR_OK;
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}
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/* packet consists of multiple fragments? */
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if ((IPH_OFFSET(iphdr) & htons(IP_OFFMASK | IP_MF)) != 0) {
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#if IP_REASSEMBLY /* packet fragment reassembly code present? */
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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",
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ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & htons(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)*8));
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/* reassemble the packet*/
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p = ip_reass(p);
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/* packet not fully reassembled yet? */
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if (p == NULL) {
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return ERR_OK;
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}
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iphdr = p->payload;
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#else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
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pbuf_free(p);
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LWIP_DEBUGF(IP_DEBUG | 2, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
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ntohs(IPH_OFFSET(iphdr))));
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IP_STATS_INC(ip.opterr);
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IP_STATS_INC(ip.drop);
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/* unsupported protocol feature */
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snmp_inc_ipinunknownprotos();
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return ERR_OK;
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#endif /* IP_REASSEMBLY */
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}
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#if IP_OPTIONS == 0 /* no support for IP options in the IP header? */
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if (iphdrlen > IP_HLEN) {
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LWIP_DEBUGF(IP_DEBUG | 2, ("IP packet dropped since there were IP options (while IP_OPTIONS == 0).\n"));
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pbuf_free(p);
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IP_STATS_INC(ip.opterr);
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IP_STATS_INC(ip.drop);
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/* unsupported protocol feature */
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snmp_inc_ipinunknownprotos();
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return ERR_OK;
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}
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#endif /* IP_OPTIONS == 0 */
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/* send to upper layers */
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LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
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ip_debug_print(p);
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LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
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#if LWIP_RAW
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/* raw input did not eat the packet? */
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if (raw_input(p, inp) == 0) {
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#endif /* LWIP_RAW */
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switch (IPH_PROTO(iphdr)) {
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#if LWIP_UDP
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case IP_PROTO_UDP:
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case IP_PROTO_UDPLITE:
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snmp_inc_ipindelivers();
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udp_input(p, inp);
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break;
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#endif /* LWIP_UDP */
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#if LWIP_TCP
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case IP_PROTO_TCP:
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snmp_inc_ipindelivers();
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tcp_input(p, inp);
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break;
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#endif /* LWIP_TCP */
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case IP_PROTO_ICMP:
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snmp_inc_ipindelivers();
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icmp_input(p, inp);
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break;
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default:
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/* send ICMP destination protocol unreachable unless is was a broadcast */
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if (!ip_addr_isbroadcast(&(iphdr->dest), inp) &&
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!ip_addr_ismulticast(&(iphdr->dest))) {
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p->payload = iphdr;
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icmp_dest_unreach(p, ICMP_DUR_PROTO);
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}
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pbuf_free(p);
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LWIP_DEBUGF(IP_DEBUG | 2, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
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IP_STATS_INC(ip.proterr);
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IP_STATS_INC(ip.drop);
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snmp_inc_ipinunknownprotos();
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}
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#if LWIP_RAW
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} /* LWIP_RAW */
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#endif
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return ERR_OK;
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}
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/**
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* Sends an IP packet on a network interface. This function constructs
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* the IP header and calculates the IP header checksum. If the source
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* IP address is NULL, the IP address of the outgoing network
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* interface is filled in as source address.
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*
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* @note ip_id: RFC791 "some host may be able to simply use
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* unique identifiers independent of destination"
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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, u8_t tos,
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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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static u16_t ip_id = 0;
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snmp_inc_ipoutrequests();
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if (dest != IP_HDRINCL) {
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if (pbuf_header(p, IP_HLEN)) {
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LWIP_DEBUGF(IP_DEBUG | 2, ("ip_output: not enough room for IP header in pbuf\n"));
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IP_STATS_INC(ip.err);
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snmp_inc_ipoutdiscards();
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return ERR_BUF;
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}
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iphdr = p->payload;
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IPH_TTL_SET(iphdr, ttl);
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IPH_PROTO_SET(iphdr, proto);
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ip_addr_set(&(iphdr->dest), dest);
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IPH_VHLTOS_SET(iphdr, 4, IP_HLEN / 4, tos);
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IPH_LEN_SET(iphdr, htons(p->tot_len));
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IPH_OFFSET_SET(iphdr, htons(IP_DF));
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IPH_ID_SET(iphdr, htons(ip_id));
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++ip_id;
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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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IPH_CHKSUM_SET(iphdr, 0);
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#if CHECKSUM_GEN_IP
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IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
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#endif
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} else {
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iphdr = p->payload;
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dest = &(iphdr->dest);
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}
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#if IP_FRAG
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/* don't fragment if interface has mtu set to 0 [loopif] */
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if (netif->mtu && (p->tot_len > netif->mtu))
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return ip_frag(p,netif,dest);
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#endif
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IP_STATS_INC(ip.xmit);
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LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
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ip_debug_print(p);
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LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
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return netif->output(netif, p, dest);
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}
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/**
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* Simple interface to ip_output_if. It finds the outgoing network
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* interface and 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 tos, 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 | 2, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
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IP_STATS_INC(ip.rterr);
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snmp_inc_ipoutnoroutes();
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return ERR_RTE;
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}
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return ip_output_if(p, src, dest, ttl, tos, proto, netif);
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}
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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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u8_t *payload;
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payload = (u8_t *)iphdr + IP_HLEN;
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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" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n",
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IPH_V(iphdr),
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IPH_HL(iphdr),
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IPH_TOS(iphdr),
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ntohs(IPH_LEN(iphdr))));
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LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n",
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ntohs(IPH_ID(iphdr)),
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ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
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ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
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ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
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ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
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LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n",
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IPH_TTL(iphdr),
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IPH_PROTO(iphdr),
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ntohs(IPH_CHKSUM(iphdr))));
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LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n",
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ip4_addr1(&iphdr->src),
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ip4_addr2(&iphdr->src),
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ip4_addr3(&iphdr->src),
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ip4_addr4(&iphdr->src)));
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LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n",
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ip4_addr1(&iphdr->dest),
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ip4_addr2(&iphdr->dest),
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ip4_addr3(&iphdr->dest),
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ip4_addr4(&iphdr->dest)));
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LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
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}
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#endif /* IP_DEBUG */
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