Diff: core/ipv6/ip6.c

Revision:

1:6e52445ea8c8

Parent:

0:51ac1d130fd4

Child:

2:fcd6ac34b3f8

--- a/core/ipv6/ip6.c	Fri Jun 22 09:25:39 2012 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,397 +0,0 @@
-/*
- * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- *    derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
- * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
- * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
- * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
- * OF SUCH DAMAGE.
- *
- * This file is part of the lwIP TCP/IP stack.
- *
- * Author: Adam Dunkels <adam@sics.se>
- *
- */
-
-
-
-/* ip.c
- *
- * This is the code for the IP layer for IPv6.
- *
- */
-
-
-#include "lwip/opt.h"
-
-#include "lwip/def.h"
-#include "lwip/mem.h"
-#include "lwip/ip.h"
-#include "lwip/inet.h"
-#include "lwip/netif.h"
-#include "lwip/icmp.h"
-#include "lwip/udp.h"
-#include "lwip/tcp_impl.h"
-
-#include "lwip/stats.h"
-
-#include "arch/perf.h"
-
-/* ip_init:
- *
- * Initializes the IP layer.
- */
-
-void
-ip_init(void)
-{
-}
-
-/* ip_route:
- *
- * Finds the appropriate network interface for a given IP address. It searches the
- * list of network interfaces linearly. A match is found if the masked IP address of
- * the network interface equals the masked IP address given to the function.
- */
-
-struct netif *
-ip_route(struct ip_addr *dest)
-{
-  struct netif *netif;
-
-  for(netif = netif_list; netif != NULL; netif = netif->next) {
-    if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
-      return netif;
-    }
-  }
-
-  return netif_default;
-}
-
-/* ip_forward:
- *
- * Forwards an IP packet. It finds an appropriate route for the packet, decrements
- * the TTL value of the packet, adjusts the checksum and outputs the packet on the
- * appropriate interface.
- */
-
-static void
-ip_forward(struct pbuf *p, struct ip_hdr *iphdr)
-{
-  struct netif *netif;
-
-  PERF_START;
-
-  if ((netif = ip_route((struct ip_addr *)&(iphdr->dest))) == NULL) {
-
-    LWIP_DEBUGF(IP_DEBUG, ("ip_input: no forwarding route found for "));
-#if IP_DEBUG
-    ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
-#endif /* IP_DEBUG */
-    LWIP_DEBUGF(IP_DEBUG, ("\n"));
-    pbuf_free(p);
-    return;
-  }
-  /* Decrement TTL and send ICMP if ttl == 0. */
-  if (--iphdr->hoplim == 0) {
-#if LWIP_ICMP
-    /* Don't send ICMP messages in response to ICMP messages */
-    if (iphdr->nexthdr != IP_PROTO_ICMP) {
-      icmp_time_exceeded(p, ICMP_TE_TTL);
-    }
-#endif /* LWIP_ICMP */
-    pbuf_free(p);
-    return;
-  }
-
-  /* Incremental update of the IP checksum. */
-  /*  if (iphdr->chksum >= htons(0xffff - 0x100)) {
-    iphdr->chksum += htons(0x100) + 1;
-  } else {
-    iphdr->chksum += htons(0x100);
-    }*/
-
-
-  LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to "));
-#if IP_DEBUG
-  ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
-#endif /* IP_DEBUG */
-  LWIP_DEBUGF(IP_DEBUG, ("\n"));
-
-  IP_STATS_INC(ip.fw);
-  IP_STATS_INC(ip.xmit);
-
-  PERF_STOP("ip_forward");
-
-  netif->output(netif, p, (struct ip_addr *)&(iphdr->dest));
-}
-
-/* ip_input:
- *
- * This function is called by the network interface device driver when an IP packet is
- * received. The function does the basic checks of the IP header such as packet size
- * being at least larger than the header size etc. If the packet was not destined for
- * us, the packet is forwarded (using ip_forward). The IP checksum is always checked.
- *
- * Finally, the packet is sent to the upper layer protocol input function.
- */
-
-void
-ip_input(struct pbuf *p, struct netif *inp) {
-  struct ip_hdr *iphdr;
-  struct netif *netif;
-
-
-  PERF_START;
-
-#if IP_DEBUG
-  ip_debug_print(p);
-#endif /* IP_DEBUG */
-
-
-  IP_STATS_INC(ip.recv);
-
-  /* identify the IP header */
-  iphdr = p->payload;
-
-
-  if (iphdr->v != 6) {
-    LWIP_DEBUGF(IP_DEBUG, ("IP packet dropped due to bad version number\n"));
-#if IP_DEBUG
-    ip_debug_print(p);
-#endif /* IP_DEBUG */
-    pbuf_free(p);
-    IP_STATS_INC(ip.err);
-    IP_STATS_INC(ip.drop);
-    return;
-  }
-
-  /* is this packet for us? */
-  for(netif = netif_list; netif != NULL; netif = netif->next) {
-#if IP_DEBUG
-    LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest "));
-    ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
-    LWIP_DEBUGF(IP_DEBUG, ("netif->ip_addr "));
-    ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
-    LWIP_DEBUGF(IP_DEBUG, ("\n"));
-#endif /* IP_DEBUG */
-    if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr))) {
-      break;
-    }
-  }
-
-
-  if (netif == NULL) {
-    /* packet not for us, route or discard */
-#if IP_FORWARD
-    ip_forward(p, iphdr);
-#endif
-    pbuf_free(p);
-    return;
-  }
-
-  pbuf_realloc(p, IP_HLEN + ntohs(iphdr->len));
-
-  /* send to upper layers */
-#if IP_DEBUG
-  /*  LWIP_DEBUGF("ip_input: \n");
-  ip_debug_print(p);
-  LWIP_DEBUGF("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len);*/
-#endif /* IP_DEBUG */
-
-  if(pbuf_header(p, -IP_HLEN)) {
-    LWIP_ASSERT("Can't move over header in packet", 0);
-    return;
-  }
-
-  switch (iphdr->nexthdr) {
-  case IP_PROTO_UDP:
-    udp_input(p, inp);
-    break;
-  case IP_PROTO_TCP:
-    tcp_input(p, inp);
-    break;
-#if LWIP_ICMP
-  case IP_PROTO_ICMP:
-    icmp_input(p, inp);
-    break;
-#endif /* LWIP_ICMP */
-  default:
-#if LWIP_ICMP
-    /* send ICMP destination protocol unreachable */
-    icmp_dest_unreach(p, ICMP_DUR_PROTO);
-#endif /* LWIP_ICMP */
-    pbuf_free(p);
-    LWIP_DEBUGF(IP_DEBUG, ("Unsupported transport protocol %"U16_F"\n",
-          iphdr->nexthdr));
-
-    IP_STATS_INC(ip.proterr);
-    IP_STATS_INC(ip.drop);
-  }
-  PERF_STOP("ip_input");
-}
-
-
-/* ip_output_if:
- *
- * Sends an IP packet on a network interface. This function constructs the IP header
- * and calculates the IP header checksum. If the source IP address is NULL,
- * the IP address of the outgoing network interface is filled in as source address.
- */
-
-err_t
-ip_output_if (struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
-       u8_t ttl,
-       u8_t proto, struct netif *netif)
-{
-  struct ip_hdr *iphdr;
-
-  PERF_START;
-
-  LWIP_DEBUGF(IP_DEBUG, ("len %"U16_F" tot_len %"U16_F"\n", p->len, p->tot_len));
-  if (pbuf_header(p, IP_HLEN)) {
-    LWIP_DEBUGF(IP_DEBUG, ("ip_output: not enough room for IP header in pbuf\n"));
-    IP_STATS_INC(ip.err);
-
-    return ERR_BUF;
-  }
-  LWIP_DEBUGF(IP_DEBUG, ("len %"U16_F" tot_len %"U16_F"\n", p->len, p->tot_len));
-
-  iphdr = p->payload;
-
-
-  if (dest != IP_HDRINCL) {
-    LWIP_DEBUGF(IP_DEBUG, ("!IP_HDRLINCL\n"));
-    iphdr->hoplim = ttl;
-    iphdr->nexthdr = proto;
-    iphdr->len = htons(p->tot_len - IP_HLEN);
-    ip_addr_set(&(iphdr->dest), dest);
-
-    iphdr->v = 6;
-
-    if (ip_addr_isany(src)) {
-      ip_addr_set(&(iphdr->src), &(netif->ip_addr));
-    } else {
-      ip_addr_set(&(iphdr->src), src);
-    }
-
-  } else {
-    dest = &(iphdr->dest);
-  }
-
-  IP_STATS_INC(ip.xmit);
-
-  LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c (len %"U16_F")\n", netif->name[0], netif->name[1], p->tot_len));
-#if IP_DEBUG
-  ip_debug_print(p);
-#endif /* IP_DEBUG */
-
-  PERF_STOP("ip_output_if");
-  return netif->output(netif, p, dest);
-}
-
-/* ip_output:
- *
- * Simple interface to ip_output_if. It finds the outgoing network interface and
- * calls upon ip_output_if to do the actual work.
- */
-
-err_t
-ip_output(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
-    u8_t ttl, u8_t proto)
-{
-  struct netif *netif;
-  if ((netif = ip_route(dest)) == NULL) {
-    LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
-    IP_STATS_INC(ip.rterr);
-    return ERR_RTE;
-  }
-
-  return ip_output_if (p, src, dest, ttl, proto, netif);
-}
-
-#if LWIP_NETIF_HWADDRHINT
-err_t
-ip_output_hinted(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
-          u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
-{
-  struct netif *netif;
-  err_t err;
-
-  if ((netif = ip_route(dest)) == NULL) {
-    LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
-    IP_STATS_INC(ip.rterr);
-    return ERR_RTE;
-  }
-
-  netif->addr_hint = addr_hint;
-  err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
-  netif->addr_hint = NULL;
-
-  return err;
-}
-#endif /* LWIP_NETIF_HWADDRHINT*/
-
-#if IP_DEBUG
-void
-ip_debug_print(struct pbuf *p)
-{
-  struct ip_hdr *iphdr = p->payload;
-
-  LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
-  LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
-  LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |  %"X16_F"%"X16_F"  |      %"X16_F"%"X16_F"           | (v, traffic class, flow label)\n",
-        iphdr->v,
-        iphdr->tclass1, iphdr->tclass2,
-        iphdr->flow1, iphdr->flow2));
-  LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
-  LWIP_DEBUGF(IP_DEBUG, ("|    %5"U16_F"      | %2"U16_F"  |  %2"U16_F"   | (len, nexthdr, hoplim)\n",
-        ntohs(iphdr->len),
-        iphdr->nexthdr,
-        iphdr->hoplim));
-  LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
-  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (src)\n",
-        (ntohl(iphdr->src.addr[0]) >> 16) & 0xffff,
-        ntohl(iphdr->src.addr[0]) & 0xffff));
-  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (src)\n",
-        (ntohl(iphdr->src.addr[1]) >> 16) & 0xffff,
-        ntohl(iphdr->src.addr[1]) & 0xffff));
-  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (src)\n",
-        (ntohl(iphdr->src.addr[2]) >> 16) & 0xffff,
-        ntohl(iphdr->src.addr[2]) & 0xffff));
-  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (src)\n",
-        (ntohl(iphdr->src.addr[3]) >> 16) & 0xffff,
-        ntohl(iphdr->src.addr[3]) & 0xffff));
-  LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
-  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (dest)\n",
-        (ntohl(iphdr->dest.addr[0]) >> 16) & 0xffff,
-        ntohl(iphdr->dest.addr[0]) & 0xffff));
-  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (dest)\n",
-        (ntohl(iphdr->dest.addr[1]) >> 16) & 0xffff,
-        ntohl(iphdr->dest.addr[1]) & 0xffff));
-  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (dest)\n",
-        (ntohl(iphdr->dest.addr[2]) >> 16) & 0xffff,
-        ntohl(iphdr->dest.addr[2]) & 0xffff));
-  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (dest)\n",
-        (ntohl(iphdr->dest.addr[3]) >> 16) & 0xffff,
-        ntohl(iphdr->dest.addr[3]) & 0xffff));
-  LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
-}
-#endif /* IP_DEBUG */