--- /dev/null
+/*
+ * 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.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 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 */
