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Adpated comments to match Doxygen/JavaDoc style.
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@ -1,3 +1,10 @@
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/* @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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@ -30,18 +37,8 @@
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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.
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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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@ -63,18 +60,17 @@
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#endif /* LWIP_DHCP */
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/* ip_init:
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*
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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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/* no initializations as of yet */
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}
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/* ip_route:
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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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@ -99,8 +95,7 @@ ip_route(struct ip_addr *dest)
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}
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#if IP_FORWARD
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/* ip_forward:
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*
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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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@ -121,7 +116,7 @@ ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
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return;
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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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* 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_ipnoroutes();
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@ -160,8 +155,7 @@ ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
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}
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#endif /* IP_FORWARD */
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/* ip_input:
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*
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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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@ -223,7 +217,7 @@ ip_input(struct pbuf *p, struct netif *inp) {
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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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* 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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/* is this packet for us? */
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@ -254,8 +248,8 @@ ip_input(struct pbuf *p, struct netif *inp) {
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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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* 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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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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@ -286,19 +280,19 @@ ip_input(struct pbuf *p, struct netif *inp) {
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pbuf_free(p);
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return ERR_OK;
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}
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#if IP_REASSEMBLY
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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%04x tot_len=%u len=%u MF=%u offset=%u), 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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}
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#else /* IP_REASSEMBLY */
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if ((IPH_OFFSET(iphdr) & htons(IP_OFFMASK | IP_MF)) != 0) {
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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%x) (while IP_REASSEMBLY == 0).\n",
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ntohs(IPH_OFFSET(iphdr))));
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@ -306,10 +300,10 @@ ip_input(struct pbuf *p, struct netif *inp) {
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IP_STATS_INC(ip.drop);
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snmp_inc_ipunknownprotos();
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return ERR_OK;
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}
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#endif /* IP_REASSEMBLY */
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}
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#if IP_OPTIONS == 0
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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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@ -326,7 +320,8 @@ ip_input(struct pbuf *p, struct netif *inp) {
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LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %d p->tot_len %d\n", p->len, p->tot_len));
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#if LWIP_RAW
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if (!raw_input(p, inp)) {
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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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@ -361,7 +356,6 @@ ip_input(struct pbuf *p, struct netif *inp) {
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IP_STATS_INC(ip.proterr);
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IP_STATS_INC(ip.drop);
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snmp_inc_ipunknownprotos();
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}
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#if LWIP_RAW
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} /* LWIP_RAW */
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@ -369,9 +363,7 @@ ip_input(struct pbuf *p, struct netif *inp) {
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return ERR_OK;
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}
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/* ip_output_if:
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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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@ -441,8 +433,7 @@ ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
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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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/**
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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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@ -1,3 +1,9 @@
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/* @file
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*
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* This is the IP packet segmentation and reassembly implementation.
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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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@ -31,14 +37,6 @@
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*
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*/
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/* ip_frag.c
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*
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* This is the code for IP segmentation and reassembly
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*
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*/
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#include "lwip/opt.h"
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#include "lwip/sys.h"
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#include "lwip/ip.h"
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@ -294,7 +292,6 @@ ip_frag(struct pbuf *p, struct netif *netif, struct ip_addr *dest)
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rambuf->tot_len = rambuf->len = mtu;
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rambuf->payload = MEM_ALIGN((void *)buf);
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/* Copy the IP header in it */
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iphdr = rambuf->payload;
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memcpy(iphdr, p->payload, IP_HLEN);
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