| /* |
| * 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 */ |