TCPSpeedTest - I have a problem getting this to work. Server onl…

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Jesper Taxbøl / Mbed 2 deprecated TCPSpeedTest

I have a problem getting this to work. Server only recieves half of the data being sent. Whats wrong

lwip/core/ipv4/ip.c@0:66300c77c6e9, 2011-03-29 (annotated)

Committer:: tax
Date:: Tue Mar 29 13:20:15 2011 +0000
Revision:: 0:66300c77c6e9

Who changed what in which revision?

User	Revision	Line number	New contents of line
tax	0:66300c77c6e9	1	/**
tax	0:66300c77c6e9	2	* @file
tax	0:66300c77c6e9	3	* This is the IPv4 layer implementation for incoming and outgoing IP traffic.
tax	0:66300c77c6e9	4	*
tax	0:66300c77c6e9	5	* @see ip_frag.c
tax	0:66300c77c6e9	6	*
tax	0:66300c77c6e9	7	*/
tax	0:66300c77c6e9	8
tax	0:66300c77c6e9	9	/*
tax	0:66300c77c6e9	10	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
tax	0:66300c77c6e9	11	* All rights reserved.
tax	0:66300c77c6e9	12	*
tax	0:66300c77c6e9	13	* Redistribution and use in source and binary forms, with or without modification,
tax	0:66300c77c6e9	14	* are permitted provided that the following conditions are met:
tax	0:66300c77c6e9	15	*
tax	0:66300c77c6e9	16	* 1. Redistributions of source code must retain the above copyright notice,
tax	0:66300c77c6e9	17	* this list of conditions and the following disclaimer.
tax	0:66300c77c6e9	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
tax	0:66300c77c6e9	19	* this list of conditions and the following disclaimer in the documentation
tax	0:66300c77c6e9	20	* and/or other materials provided with the distribution.
tax	0:66300c77c6e9	21	* 3. The name of the author may not be used to endorse or promote products
tax	0:66300c77c6e9	22	* derived from this software without specific prior written permission.
tax	0:66300c77c6e9	23	*
tax	0:66300c77c6e9	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
tax	0:66300c77c6e9	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
tax	0:66300c77c6e9	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
tax	0:66300c77c6e9	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
tax	0:66300c77c6e9	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
tax	0:66300c77c6e9	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
tax	0:66300c77c6e9	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
tax	0:66300c77c6e9	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
tax	0:66300c77c6e9	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
tax	0:66300c77c6e9	33	* OF SUCH DAMAGE.
tax	0:66300c77c6e9	34	*
tax	0:66300c77c6e9	35	* This file is part of the lwIP TCP/IP stack.
tax	0:66300c77c6e9	36	*
tax	0:66300c77c6e9	37	* Author: Adam Dunkels <adam@sics.se>
tax	0:66300c77c6e9	38	*
tax	0:66300c77c6e9	39	*/
tax	0:66300c77c6e9	40
tax	0:66300c77c6e9	41	#include "lwip/opt.h"
tax	0:66300c77c6e9	42	#include "lwip/ip.h"
tax	0:66300c77c6e9	43	#include "lwip/def.h"
tax	0:66300c77c6e9	44	#include "lwip/mem.h"
tax	0:66300c77c6e9	45	#include "lwip/ip_frag.h"
tax	0:66300c77c6e9	46	#include "lwip/inet_chksum.h"
tax	0:66300c77c6e9	47	#include "lwip/netif.h"
tax	0:66300c77c6e9	48	#include "lwip/icmp.h"
tax	0:66300c77c6e9	49	#include "lwip/igmp.h"
tax	0:66300c77c6e9	50	#include "lwip/raw.h"
tax	0:66300c77c6e9	51	#include "lwip/udp.h"
tax	0:66300c77c6e9	52	#include "lwip/tcp_impl.h"
tax	0:66300c77c6e9	53	#include "lwip/snmp.h"
tax	0:66300c77c6e9	54	#include "lwip/dhcp.h"
tax	0:66300c77c6e9	55	#include "lwip/autoip.h"
tax	0:66300c77c6e9	56	#include "lwip/stats.h"
tax	0:66300c77c6e9	57	#include "arch/perf.h"
tax	0:66300c77c6e9	58
tax	0:66300c77c6e9	59	#include <string.h>
tax	0:66300c77c6e9	60
tax	0:66300c77c6e9	61	/** Set this to 0 in the rare case of wanting to call an extra function to
tax	0:66300c77c6e9	62	* generate the IP checksum (in contrast to calculating it on-the-fly). */
tax	0:66300c77c6e9	63	#ifndef LWIP_INLINE_IP_CHKSUM
tax	0:66300c77c6e9	64	#define LWIP_INLINE_IP_CHKSUM 1
tax	0:66300c77c6e9	65	#endif
tax	0:66300c77c6e9	66	#if LWIP_INLINE_IP_CHKSUM && CHECKSUM_GEN_IP
tax	0:66300c77c6e9	67	#define CHECKSUM_GEN_IP_INLINE 1
tax	0:66300c77c6e9	68	#else
tax	0:66300c77c6e9	69	#define CHECKSUM_GEN_IP_INLINE 0
tax	0:66300c77c6e9	70	#endif
tax	0:66300c77c6e9	71
tax	0:66300c77c6e9	72	#if LWIP_DHCP \|\| defined(LWIP_IP_ACCEPT_UDP_PORT)
tax	0:66300c77c6e9	73	#define IP_ACCEPT_LINK_LAYER_ADDRESSING 1
tax	0:66300c77c6e9	74
tax	0:66300c77c6e9	75	/** Some defines for DHCP to let link-layer-addressed packets through while the
tax	0:66300c77c6e9	76	* netif is down.
tax	0:66300c77c6e9	77	* To use this in your own application/protocol, define LWIP_IP_ACCEPT_UDP_PORT
tax	0:66300c77c6e9	78	* to return 1 if the port is accepted and 0 if the port is not accepted.
tax	0:66300c77c6e9	79	*/
tax	0:66300c77c6e9	80	#if LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT)
tax	0:66300c77c6e9	81	/* accept DHCP client port and custom port */
tax	0:66300c77c6e9	82	#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (((port) == PP_NTOHS(DHCP_CLIENT_PORT)) \
tax	0:66300c77c6e9	83	\|\| (LWIP_IP_ACCEPT_UDP_PORT(port)))
tax	0:66300c77c6e9	84	#elif defined(LWIP_IP_ACCEPT_UDP_PORT) /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
tax	0:66300c77c6e9	85	/* accept custom port only */
tax	0:66300c77c6e9	86	#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (LWIP_IP_ACCEPT_UDP_PORT(dst_port))
tax	0:66300c77c6e9	87	#else /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
tax	0:66300c77c6e9	88	/* accept DHCP client port only */
tax	0:66300c77c6e9	89	#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) ((port) == PP_NTOHS(DHCP_CLIENT_PORT))
tax	0:66300c77c6e9	90	#endif /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
tax	0:66300c77c6e9	91
tax	0:66300c77c6e9	92	#else /* LWIP_DHCP */
tax	0:66300c77c6e9	93	#define IP_ACCEPT_LINK_LAYER_ADDRESSING 0
tax	0:66300c77c6e9	94	#endif /* LWIP_DHCP */
tax	0:66300c77c6e9	95
tax	0:66300c77c6e9	96	/**
tax	0:66300c77c6e9	97	* The interface that provided the packet for the current callback
tax	0:66300c77c6e9	98	* invocation.
tax	0:66300c77c6e9	99	*/
tax	0:66300c77c6e9	100	struct netif *current_netif;
tax	0:66300c77c6e9	101
tax	0:66300c77c6e9	102	/**
tax	0:66300c77c6e9	103	* Header of the input packet currently being processed.
tax	0:66300c77c6e9	104	*/
tax	0:66300c77c6e9	105	const struct ip_hdr *current_header;
tax	0:66300c77c6e9	106	/** Source IP address of current_header */
tax	0:66300c77c6e9	107	ip_addr_t current_iphdr_src;
tax	0:66300c77c6e9	108	/** Destination IP address of current_header */
tax	0:66300c77c6e9	109	ip_addr_t current_iphdr_dest;
tax	0:66300c77c6e9	110
tax	0:66300c77c6e9	111	/** The IP header ID of the next outgoing IP packet */
tax	0:66300c77c6e9	112	static u16_t ip_id;
tax	0:66300c77c6e9	113
tax	0:66300c77c6e9	114	/**
tax	0:66300c77c6e9	115	* Finds the appropriate network interface for a given IP address. It
tax	0:66300c77c6e9	116	* searches the list of network interfaces linearly. A match is found
tax	0:66300c77c6e9	117	* if the masked IP address of the network interface equals the masked
tax	0:66300c77c6e9	118	* IP address given to the function.
tax	0:66300c77c6e9	119	*
tax	0:66300c77c6e9	120	* @param dest the destination IP address for which to find the route
tax	0:66300c77c6e9	121	* @return the netif on which to send to reach dest
tax	0:66300c77c6e9	122	*/
tax	0:66300c77c6e9	123	struct netif *
tax	0:66300c77c6e9	124	ip_route(ip_addr_t *dest)
tax	0:66300c77c6e9	125	{
tax	0:66300c77c6e9	126	struct netif *netif;
tax	0:66300c77c6e9	127
tax	0:66300c77c6e9	128	/* iterate through netifs */
tax	0:66300c77c6e9	129	for(netif = netif_list; netif != NULL; netif = netif->next) {
tax	0:66300c77c6e9	130	/* network mask matches? */
tax	0:66300c77c6e9	131	if (netif_is_up(netif)) {
tax	0:66300c77c6e9	132	if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
tax	0:66300c77c6e9	133	/* return netif on which to forward IP packet */
tax	0:66300c77c6e9	134	return netif;
tax	0:66300c77c6e9	135	}
tax	0:66300c77c6e9	136	}
tax	0:66300c77c6e9	137	}
tax	0:66300c77c6e9	138	if ((netif_default == NULL) \|\| (!netif_is_up(netif_default))) {
tax	0:66300c77c6e9	139	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("ip_route: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
tax	0:66300c77c6e9	140	ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
tax	0:66300c77c6e9	141	IP_STATS_INC(ip.rterr);
tax	0:66300c77c6e9	142	snmp_inc_ipoutnoroutes();
tax	0:66300c77c6e9	143	return NULL;
tax	0:66300c77c6e9	144	}
tax	0:66300c77c6e9	145	/* no matching netif found, use default netif */
tax	0:66300c77c6e9	146	return netif_default;
tax	0:66300c77c6e9	147	}
tax	0:66300c77c6e9	148
tax	0:66300c77c6e9	149	#if IP_FORWARD
tax	0:66300c77c6e9	150	/**
tax	0:66300c77c6e9	151	* Forwards an IP packet. It finds an appropriate route for the
tax	0:66300c77c6e9	152	* packet, decrements the TTL value of the packet, adjusts the
tax	0:66300c77c6e9	153	* checksum and outputs the packet on the appropriate interface.
tax	0:66300c77c6e9	154	*
tax	0:66300c77c6e9	155	* @param p the packet to forward (p->payload points to IP header)
tax	0:66300c77c6e9	156	* @param iphdr the IP header of the input packet
tax	0:66300c77c6e9	157	* @param inp the netif on which this packet was received
tax	0:66300c77c6e9	158	*/
tax	0:66300c77c6e9	159	static void
tax	0:66300c77c6e9	160	ip_forward(struct pbuf p, struct ip_hdr iphdr, struct netif *inp)
tax	0:66300c77c6e9	161	{
tax	0:66300c77c6e9	162	struct netif *netif;
tax	0:66300c77c6e9	163
tax	0:66300c77c6e9	164	PERF_START;
tax	0:66300c77c6e9	165
tax	0:66300c77c6e9	166	/* RFC3927 2.7: do not forward link-local addresses */
tax	0:66300c77c6e9	167	if (ip_addr_islinklocal(&current_iphdr_dest)) {
tax	0:66300c77c6e9	168	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not forwarding LLA %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
tax	0:66300c77c6e9	169	ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
tax	0:66300c77c6e9	170	ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
tax	0:66300c77c6e9	171	goto return_noroute;
tax	0:66300c77c6e9	172	}
tax	0:66300c77c6e9	173
tax	0:66300c77c6e9	174	/* Find network interface where to forward this IP packet to. */
tax	0:66300c77c6e9	175	netif = ip_route(&current_iphdr_dest);
tax	0:66300c77c6e9	176	if (netif == NULL) {
tax	0:66300c77c6e9	177	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
tax	0:66300c77c6e9	178	ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
tax	0:66300c77c6e9	179	ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
tax	0:66300c77c6e9	180	goto return_noroute;
tax	0:66300c77c6e9	181	}
tax	0:66300c77c6e9	182	/* Do not forward packets onto the same network interface on which
tax	0:66300c77c6e9	183	* they arrived. */
tax	0:66300c77c6e9	184	if (netif == inp) {
tax	0:66300c77c6e9	185	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
tax	0:66300c77c6e9	186	goto return_noroute;
tax	0:66300c77c6e9	187	}
tax	0:66300c77c6e9	188
tax	0:66300c77c6e9	189	/* decrement TTL */
tax	0:66300c77c6e9	190	IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
tax	0:66300c77c6e9	191	/* send ICMP if TTL == 0 */
tax	0:66300c77c6e9	192	if (IPH_TTL(iphdr) == 0) {
tax	0:66300c77c6e9	193	snmp_inc_ipinhdrerrors();
tax	0:66300c77c6e9	194	#if LWIP_ICMP
tax	0:66300c77c6e9	195	/* Don't send ICMP messages in response to ICMP messages */
tax	0:66300c77c6e9	196	if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
tax	0:66300c77c6e9	197	icmp_time_exceeded(p, ICMP_TE_TTL);
tax	0:66300c77c6e9	198	}
tax	0:66300c77c6e9	199	#endif /* LWIP_ICMP */
tax	0:66300c77c6e9	200	return;
tax	0:66300c77c6e9	201	}
tax	0:66300c77c6e9	202
tax	0:66300c77c6e9	203	/* Incrementally update the IP checksum. */
tax	0:66300c77c6e9	204	if (IPH_CHKSUM(iphdr) >= PP_HTONS(0xffff - 0x100)) {
tax	0:66300c77c6e9	205	IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100) + 1);
tax	0:66300c77c6e9	206	} else {
tax	0:66300c77c6e9	207	IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100));
tax	0:66300c77c6e9	208	}
tax	0:66300c77c6e9	209
tax	0:66300c77c6e9	210	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
tax	0:66300c77c6e9	211	ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
tax	0:66300c77c6e9	212	ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
tax	0:66300c77c6e9	213
tax	0:66300c77c6e9	214	IP_STATS_INC(ip.fw);
tax	0:66300c77c6e9	215	IP_STATS_INC(ip.xmit);
tax	0:66300c77c6e9	216	snmp_inc_ipforwdatagrams();
tax	0:66300c77c6e9	217
tax	0:66300c77c6e9	218	PERF_STOP("ip_forward");
tax	0:66300c77c6e9	219	/* transmit pbuf on chosen interface */
tax	0:66300c77c6e9	220	netif->output(netif, p, &current_iphdr_dest);
tax	0:66300c77c6e9	221	return;
tax	0:66300c77c6e9	222	return_noroute:
tax	0:66300c77c6e9	223	snmp_inc_ipoutnoroutes();
tax	0:66300c77c6e9	224	}
tax	0:66300c77c6e9	225	#endif /* IP_FORWARD */
tax	0:66300c77c6e9	226
tax	0:66300c77c6e9	227	/**
tax	0:66300c77c6e9	228	* This function is called by the network interface device driver when
tax	0:66300c77c6e9	229	* an IP packet is received. The function does the basic checks of the
tax	0:66300c77c6e9	230	* IP header such as packet size being at least larger than the header
tax	0:66300c77c6e9	231	* size etc. If the packet was not destined for us, the packet is
tax	0:66300c77c6e9	232	* forwarded (using ip_forward). The IP checksum is always checked.
tax	0:66300c77c6e9	233	*
tax	0:66300c77c6e9	234	* Finally, the packet is sent to the upper layer protocol input function.
tax	0:66300c77c6e9	235	*
tax	0:66300c77c6e9	236	* @param p the received IP packet (p->payload points to IP header)
tax	0:66300c77c6e9	237	* @param inp the netif on which this packet was received
tax	0:66300c77c6e9	238	* @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
tax	0:66300c77c6e9	239	* processed, but currently always returns ERR_OK)
tax	0:66300c77c6e9	240	*/
tax	0:66300c77c6e9	241	err_t
tax	0:66300c77c6e9	242	ip_input(struct pbuf p, struct netif inp)
tax	0:66300c77c6e9	243	{
tax	0:66300c77c6e9	244	struct ip_hdr *iphdr;
tax	0:66300c77c6e9	245	struct netif *netif;
tax	0:66300c77c6e9	246	u16_t iphdr_hlen;
tax	0:66300c77c6e9	247	u16_t iphdr_len;
tax	0:66300c77c6e9	248	#if IP_ACCEPT_LINK_LAYER_ADDRESSING
tax	0:66300c77c6e9	249	int check_ip_src=1;
tax	0:66300c77c6e9	250	#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
tax	0:66300c77c6e9	251
tax	0:66300c77c6e9	252	IP_STATS_INC(ip.recv);
tax	0:66300c77c6e9	253	snmp_inc_ipinreceives();
tax	0:66300c77c6e9	254
tax	0:66300c77c6e9	255	/* identify the IP header */
tax	0:66300c77c6e9	256	iphdr = (struct ip_hdr *)p->payload;
tax	0:66300c77c6e9	257	if (IPH_V(iphdr) != 4) {
tax	0:66300c77c6e9	258	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
tax	0:66300c77c6e9	259	ip_debug_print(p);
tax	0:66300c77c6e9	260	pbuf_free(p);
tax	0:66300c77c6e9	261	IP_STATS_INC(ip.err);
tax	0:66300c77c6e9	262	IP_STATS_INC(ip.drop);
tax	0:66300c77c6e9	263	snmp_inc_ipinhdrerrors();
tax	0:66300c77c6e9	264	return ERR_OK;
tax	0:66300c77c6e9	265	}
tax	0:66300c77c6e9	266
tax	0:66300c77c6e9	267	/* obtain IP header length in number of 32-bit words */
tax	0:66300c77c6e9	268	iphdr_hlen = IPH_HL(iphdr);
tax	0:66300c77c6e9	269	/* calculate IP header length in bytes */
tax	0:66300c77c6e9	270	iphdr_hlen *= 4;
tax	0:66300c77c6e9	271	/* obtain ip length in bytes */
tax	0:66300c77c6e9	272	iphdr_len = ntohs(IPH_LEN(iphdr));
tax	0:66300c77c6e9	273
tax	0:66300c77c6e9	274	/* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
tax	0:66300c77c6e9	275	if ((iphdr_hlen > p->len) \|\| (iphdr_len > p->tot_len)) {
tax	0:66300c77c6e9	276	if (iphdr_hlen > p->len) {
tax	0:66300c77c6e9	277	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
tax	0:66300c77c6e9	278	("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
tax	0:66300c77c6e9	279	iphdr_hlen, p->len));
tax	0:66300c77c6e9	280	}
tax	0:66300c77c6e9	281	if (iphdr_len > p->tot_len) {
tax	0:66300c77c6e9	282	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
tax	0:66300c77c6e9	283	("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
tax	0:66300c77c6e9	284	iphdr_len, p->tot_len));
tax	0:66300c77c6e9	285	}
tax	0:66300c77c6e9	286	/* free (drop) packet pbufs */
tax	0:66300c77c6e9	287	pbuf_free(p);
tax	0:66300c77c6e9	288	IP_STATS_INC(ip.lenerr);
tax	0:66300c77c6e9	289	IP_STATS_INC(ip.drop);
tax	0:66300c77c6e9	290	snmp_inc_ipindiscards();
tax	0:66300c77c6e9	291	return ERR_OK;
tax	0:66300c77c6e9	292	}
tax	0:66300c77c6e9	293
tax	0:66300c77c6e9	294	/* verify checksum */
tax	0:66300c77c6e9	295	#if CHECKSUM_CHECK_IP
tax	0:66300c77c6e9	296	if (inet_chksum(iphdr, iphdr_hlen) != 0) {
tax	0:66300c77c6e9	297
tax	0:66300c77c6e9	298	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
tax	0:66300c77c6e9	299	("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
tax	0:66300c77c6e9	300	ip_debug_print(p);
tax	0:66300c77c6e9	301	pbuf_free(p);
tax	0:66300c77c6e9	302	IP_STATS_INC(ip.chkerr);
tax	0:66300c77c6e9	303	IP_STATS_INC(ip.drop);
tax	0:66300c77c6e9	304	snmp_inc_ipinhdrerrors();
tax	0:66300c77c6e9	305	return ERR_OK;
tax	0:66300c77c6e9	306	}
tax	0:66300c77c6e9	307	#endif
tax	0:66300c77c6e9	308
tax	0:66300c77c6e9	309	/* Trim pbuf. This should have been done at the netif layer,
tax	0:66300c77c6e9	310	* but we'll do it anyway just to be sure that its done. */
tax	0:66300c77c6e9	311	pbuf_realloc(p, iphdr_len);
tax	0:66300c77c6e9	312
tax	0:66300c77c6e9	313	/* copy IP addresses to aligned ip_addr_t */
tax	0:66300c77c6e9	314	ip_addr_copy(current_iphdr_dest, iphdr->dest);
tax	0:66300c77c6e9	315	ip_addr_copy(current_iphdr_src, iphdr->src);
tax	0:66300c77c6e9	316
tax	0:66300c77c6e9	317	/* match packet against an interface, i.e. is this packet for us? */
tax	0:66300c77c6e9	318	#if LWIP_IGMP
tax	0:66300c77c6e9	319	if (ip_addr_ismulticast(&current_iphdr_dest)) {
tax	0:66300c77c6e9	320	if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &current_iphdr_dest))) {
tax	0:66300c77c6e9	321	netif = inp;
tax	0:66300c77c6e9	322	} else {
tax	0:66300c77c6e9	323	netif = NULL;
tax	0:66300c77c6e9	324	}
tax	0:66300c77c6e9	325	} else
tax	0:66300c77c6e9	326	#endif /* LWIP_IGMP */
tax	0:66300c77c6e9	327	{
tax	0:66300c77c6e9	328	/* start trying with inp. if that's not acceptable, start walking the
tax	0:66300c77c6e9	329	list of configured netifs.
tax	0:66300c77c6e9	330	'first' is used as a boolean to mark whether we started walking the list */
tax	0:66300c77c6e9	331	int first = 1;
tax	0:66300c77c6e9	332	netif = inp;
tax	0:66300c77c6e9	333	do {
tax	0:66300c77c6e9	334	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",
tax	0:66300c77c6e9	335	ip4_addr_get_u32(&iphdr->dest), ip4_addr_get_u32(&netif->ip_addr),
tax	0:66300c77c6e9	336	ip4_addr_get_u32(&iphdr->dest) & ip4_addr_get_u32(&netif->netmask),
tax	0:66300c77c6e9	337	ip4_addr_get_u32(&netif->ip_addr) & ip4_addr_get_u32(&netif->netmask),
tax	0:66300c77c6e9	338	ip4_addr_get_u32(&iphdr->dest) & ~ip4_addr_get_u32(&netif->netmask)));
tax	0:66300c77c6e9	339
tax	0:66300c77c6e9	340	/* interface is up and configured? */
tax	0:66300c77c6e9	341	if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
tax	0:66300c77c6e9	342	/* unicast to this interface address? */
tax	0:66300c77c6e9	343	if (ip_addr_cmp(&current_iphdr_dest, &(netif->ip_addr)) \|\|
tax	0:66300c77c6e9	344	/* or broadcast on this interface network address? */
tax	0:66300c77c6e9	345	ip_addr_isbroadcast(&current_iphdr_dest, netif)) {
tax	0:66300c77c6e9	346	LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
tax	0:66300c77c6e9	347	netif->name[0], netif->name[1]));
tax	0:66300c77c6e9	348	/* break out of for loop */
tax	0:66300c77c6e9	349	break;
tax	0:66300c77c6e9	350	}
tax	0:66300c77c6e9	351	#if LWIP_AUTOIP
tax	0:66300c77c6e9	352	/* connections to link-local addresses must persist after changing
tax	0:66300c77c6e9	353	the netif's address (RFC3927 ch. 1.9) */
tax	0:66300c77c6e9	354	if ((netif->autoip != NULL) &&
tax	0:66300c77c6e9	355	ip_addr_cmp(&current_iphdr_dest, &(netif->autoip->llipaddr))) {
tax	0:66300c77c6e9	356	LWIP_DEBUGF(IP_DEBUG, ("ip_input: LLA packet accepted on interface %c%c\n",
tax	0:66300c77c6e9	357	netif->name[0], netif->name[1]));
tax	0:66300c77c6e9	358	/* break out of for loop */
tax	0:66300c77c6e9	359	break;
tax	0:66300c77c6e9	360	}
tax	0:66300c77c6e9	361	#endif /* LWIP_AUTOIP */
tax	0:66300c77c6e9	362	}
tax	0:66300c77c6e9	363	if (first) {
tax	0:66300c77c6e9	364	first = 0;
tax	0:66300c77c6e9	365	netif = netif_list;
tax	0:66300c77c6e9	366	} else {
tax	0:66300c77c6e9	367	netif = netif->next;
tax	0:66300c77c6e9	368	}
tax	0:66300c77c6e9	369	if (netif == inp) {
tax	0:66300c77c6e9	370	netif = netif->next;
tax	0:66300c77c6e9	371	}
tax	0:66300c77c6e9	372	} while(netif != NULL);
tax	0:66300c77c6e9	373	}
tax	0:66300c77c6e9	374
tax	0:66300c77c6e9	375	#if IP_ACCEPT_LINK_LAYER_ADDRESSING
tax	0:66300c77c6e9	376	/* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
tax	0:66300c77c6e9	377	* using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
tax	0:66300c77c6e9	378	* According to RFC 1542 section 3.1.1, referred by RFC 2131).
tax	0:66300c77c6e9	379	*
tax	0:66300c77c6e9	380	* If you want to accept private broadcast communication while a netif is down,
tax	0:66300c77c6e9	381	* define LWIP_IP_ACCEPT_UDP_PORT(dst_port), e.g.:
tax	0:66300c77c6e9	382	*
tax	0:66300c77c6e9	383	* #define LWIP_IP_ACCEPT_UDP_PORT(dst_port) ((dst_port) == PP_NTOHS(12345))
tax	0:66300c77c6e9	384	*/
tax	0:66300c77c6e9	385	if (netif == NULL) {
tax	0:66300c77c6e9	386	/* remote port is DHCP server? */
tax	0:66300c77c6e9	387	if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
tax	0:66300c77c6e9	388	struct udp_hdr udphdr = (struct udp_hdr )((u8_t *)iphdr + iphdr_hlen);
tax	0:66300c77c6e9	389	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
tax	0:66300c77c6e9	390	ntohs(udphdr->dest)));
tax	0:66300c77c6e9	391	if (IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(udphdr->dest)) {
tax	0:66300c77c6e9	392	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE, ("ip_input: DHCP packet accepted.\n"));
tax	0:66300c77c6e9	393	netif = inp;
tax	0:66300c77c6e9	394	check_ip_src = 0;
tax	0:66300c77c6e9	395	}
tax	0:66300c77c6e9	396	}
tax	0:66300c77c6e9	397	}
tax	0:66300c77c6e9	398	#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
tax	0:66300c77c6e9	399
tax	0:66300c77c6e9	400	/* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
tax	0:66300c77c6e9	401	#if IP_ACCEPT_LINK_LAYER_ADDRESSING
tax	0:66300c77c6e9	402	/* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
tax	0:66300c77c6e9	403	if (check_ip_src && !ip_addr_isany(&current_iphdr_src))
tax	0:66300c77c6e9	404	#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
tax	0:66300c77c6e9	405	{ if ((ip_addr_isbroadcast(&current_iphdr_src, inp)) \|\|
tax	0:66300c77c6e9	406	(ip_addr_ismulticast(&current_iphdr_src))) {
tax	0:66300c77c6e9	407	/* packet source is not valid */
tax	0:66300c77c6e9	408	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("ip_input: packet source is not valid.\n"));
tax	0:66300c77c6e9	409	/* free (drop) packet pbufs */
tax	0:66300c77c6e9	410	pbuf_free(p);
tax	0:66300c77c6e9	411	IP_STATS_INC(ip.drop);
tax	0:66300c77c6e9	412	snmp_inc_ipinaddrerrors();
tax	0:66300c77c6e9	413	snmp_inc_ipindiscards();
tax	0:66300c77c6e9	414	return ERR_OK;
tax	0:66300c77c6e9	415	}
tax	0:66300c77c6e9	416	}
tax	0:66300c77c6e9	417
tax	0:66300c77c6e9	418	/* packet not for us? */
tax	0:66300c77c6e9	419	if (netif == NULL) {
tax	0:66300c77c6e9	420	/* packet not for us, route or discard */
tax	0:66300c77c6e9	421	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE, ("ip_input: packet not for us.\n"));
tax	0:66300c77c6e9	422	#if IP_FORWARD
tax	0:66300c77c6e9	423	/* non-broadcast packet? */
tax	0:66300c77c6e9	424	if (!ip_addr_isbroadcast(&current_iphdr_dest, inp)) {
tax	0:66300c77c6e9	425	/* try to forward IP packet on (other) interfaces */
tax	0:66300c77c6e9	426	ip_forward(p, iphdr, inp);
tax	0:66300c77c6e9	427	} else
tax	0:66300c77c6e9	428	#endif /* IP_FORWARD */
tax	0:66300c77c6e9	429	{
tax	0:66300c77c6e9	430	snmp_inc_ipinaddrerrors();
tax	0:66300c77c6e9	431	snmp_inc_ipindiscards();
tax	0:66300c77c6e9	432	}
tax	0:66300c77c6e9	433	pbuf_free(p);
tax	0:66300c77c6e9	434	return ERR_OK;
tax	0:66300c77c6e9	435	}
tax	0:66300c77c6e9	436	/* packet consists of multiple fragments? */
tax	0:66300c77c6e9	437	if ((IPH_OFFSET(iphdr) & PP_HTONS(IP_OFFMASK \| IP_MF)) != 0) {
tax	0:66300c77c6e9	438	#if IP_REASSEMBLY /* packet fragment reassembly code present? */
tax	0:66300c77c6e9	439	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",
tax	0:66300c77c6e9	440	ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & PP_HTONS(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)*8));
tax	0:66300c77c6e9	441	/* reassemble the packet*/
tax	0:66300c77c6e9	442	p = ip_reass(p);
tax	0:66300c77c6e9	443	/* packet not fully reassembled yet? */
tax	0:66300c77c6e9	444	if (p == NULL) {
tax	0:66300c77c6e9	445	return ERR_OK;
tax	0:66300c77c6e9	446	}
tax	0:66300c77c6e9	447	iphdr = (struct ip_hdr *)p->payload;
tax	0:66300c77c6e9	448	#else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
tax	0:66300c77c6e9	449	pbuf_free(p);
tax	0:66300c77c6e9	450	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
tax	0:66300c77c6e9	451	ntohs(IPH_OFFSET(iphdr))));
tax	0:66300c77c6e9	452	IP_STATS_INC(ip.opterr);
tax	0:66300c77c6e9	453	IP_STATS_INC(ip.drop);
tax	0:66300c77c6e9	454	/* unsupported protocol feature */
tax	0:66300c77c6e9	455	snmp_inc_ipinunknownprotos();
tax	0:66300c77c6e9	456	return ERR_OK;
tax	0:66300c77c6e9	457	#endif /* IP_REASSEMBLY */
tax	0:66300c77c6e9	458	}
tax	0:66300c77c6e9	459
tax	0:66300c77c6e9	460	#if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
tax	0:66300c77c6e9	461
tax	0:66300c77c6e9	462	#if LWIP_IGMP
tax	0:66300c77c6e9	463	/* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
tax	0:66300c77c6e9	464	if((iphdr_hlen > IP_HLEN) && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
tax	0:66300c77c6e9	465	#else
tax	0:66300c77c6e9	466	if (iphdr_hlen > IP_HLEN) {
tax	0:66300c77c6e9	467	#endif /* LWIP_IGMP */
tax	0:66300c77c6e9	468	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
tax	0:66300c77c6e9	469	pbuf_free(p);
tax	0:66300c77c6e9	470	IP_STATS_INC(ip.opterr);
tax	0:66300c77c6e9	471	IP_STATS_INC(ip.drop);
tax	0:66300c77c6e9	472	/* unsupported protocol feature */
tax	0:66300c77c6e9	473	snmp_inc_ipinunknownprotos();
tax	0:66300c77c6e9	474	return ERR_OK;
tax	0:66300c77c6e9	475	}
tax	0:66300c77c6e9	476	#endif /* IP_OPTIONS_ALLOWED == 0 */
tax	0:66300c77c6e9	477
tax	0:66300c77c6e9	478	/* send to upper layers */
tax	0:66300c77c6e9	479	LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
tax	0:66300c77c6e9	480	ip_debug_print(p);
tax	0:66300c77c6e9	481	LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
tax	0:66300c77c6e9	482
tax	0:66300c77c6e9	483	current_netif = inp;
tax	0:66300c77c6e9	484	current_header = iphdr;
tax	0:66300c77c6e9	485
tax	0:66300c77c6e9	486	#if LWIP_RAW
tax	0:66300c77c6e9	487	/* raw input did not eat the packet? */
tax	0:66300c77c6e9	488	if (raw_input(p, inp) == 0)
tax	0:66300c77c6e9	489	#endif /* LWIP_RAW */
tax	0:66300c77c6e9	490	{
tax	0:66300c77c6e9	491
tax	0:66300c77c6e9	492	switch (IPH_PROTO(iphdr)) {
tax	0:66300c77c6e9	493	#if LWIP_UDP
tax	0:66300c77c6e9	494	case IP_PROTO_UDP:
tax	0:66300c77c6e9	495	#if LWIP_UDPLITE
tax	0:66300c77c6e9	496	case IP_PROTO_UDPLITE:
tax	0:66300c77c6e9	497	#endif /* LWIP_UDPLITE */
tax	0:66300c77c6e9	498	snmp_inc_ipindelivers();
tax	0:66300c77c6e9	499	udp_input(p, inp);
tax	0:66300c77c6e9	500	break;
tax	0:66300c77c6e9	501	#endif /* LWIP_UDP */
tax	0:66300c77c6e9	502	#if LWIP_TCP
tax	0:66300c77c6e9	503	case IP_PROTO_TCP:
tax	0:66300c77c6e9	504	snmp_inc_ipindelivers();
tax	0:66300c77c6e9	505	tcp_input(p, inp);
tax	0:66300c77c6e9	506	break;
tax	0:66300c77c6e9	507	#endif /* LWIP_TCP */
tax	0:66300c77c6e9	508	#if LWIP_ICMP
tax	0:66300c77c6e9	509	case IP_PROTO_ICMP:
tax	0:66300c77c6e9	510	snmp_inc_ipindelivers();
tax	0:66300c77c6e9	511	icmp_input(p, inp);
tax	0:66300c77c6e9	512	break;
tax	0:66300c77c6e9	513	#endif /* LWIP_ICMP */
tax	0:66300c77c6e9	514	#if LWIP_IGMP
tax	0:66300c77c6e9	515	case IP_PROTO_IGMP:
tax	0:66300c77c6e9	516	igmp_input(p, inp, &current_iphdr_dest);
tax	0:66300c77c6e9	517	break;
tax	0:66300c77c6e9	518	#endif /* LWIP_IGMP */
tax	0:66300c77c6e9	519	default:
tax	0:66300c77c6e9	520	#if LWIP_ICMP
tax	0:66300c77c6e9	521	/* send ICMP destination protocol unreachable unless is was a broadcast */
tax	0:66300c77c6e9	522	if (!ip_addr_isbroadcast(&current_iphdr_dest, inp) &&
tax	0:66300c77c6e9	523	!ip_addr_ismulticast(&current_iphdr_dest)) {
tax	0:66300c77c6e9	524	p->payload = iphdr;
tax	0:66300c77c6e9	525	icmp_dest_unreach(p, ICMP_DUR_PROTO);
tax	0:66300c77c6e9	526	}
tax	0:66300c77c6e9	527	#endif /* LWIP_ICMP */
tax	0:66300c77c6e9	528	pbuf_free(p);
tax	0:66300c77c6e9	529
tax	0:66300c77c6e9	530	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
tax	0:66300c77c6e9	531
tax	0:66300c77c6e9	532	IP_STATS_INC(ip.proterr);
tax	0:66300c77c6e9	533	IP_STATS_INC(ip.drop);
tax	0:66300c77c6e9	534	snmp_inc_ipinunknownprotos();
tax	0:66300c77c6e9	535	}
tax	0:66300c77c6e9	536	}
tax	0:66300c77c6e9	537
tax	0:66300c77c6e9	538	current_netif = NULL;
tax	0:66300c77c6e9	539	current_header = NULL;
tax	0:66300c77c6e9	540	ip_addr_set_any(&current_iphdr_src);
tax	0:66300c77c6e9	541	ip_addr_set_any(&current_iphdr_dest);
tax	0:66300c77c6e9	542
tax	0:66300c77c6e9	543	return ERR_OK;
tax	0:66300c77c6e9	544	}
tax	0:66300c77c6e9	545
tax	0:66300c77c6e9	546	/**
tax	0:66300c77c6e9	547	* Sends an IP packet on a network interface. This function constructs
tax	0:66300c77c6e9	548	* the IP header and calculates the IP header checksum. If the source
tax	0:66300c77c6e9	549	* IP address is NULL, the IP address of the outgoing network
tax	0:66300c77c6e9	550	* interface is filled in as source address.
tax	0:66300c77c6e9	551	* If the destination IP address is IP_HDRINCL, p is assumed to already
tax	0:66300c77c6e9	552	* include an IP header and p->payload points to it instead of the data.
tax	0:66300c77c6e9	553	*
tax	0:66300c77c6e9	554	* @param p the packet to send (p->payload points to the data, e.g. next
tax	0:66300c77c6e9	555	protocol header; if dest == IP_HDRINCL, p already includes an IP
tax	0:66300c77c6e9	556	header and p->payload points to that IP header)
tax	0:66300c77c6e9	557	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
tax	0:66300c77c6e9	558	* IP address of the netif used to send is used as source address)
tax	0:66300c77c6e9	559	* @param dest the destination IP address to send the packet to
tax	0:66300c77c6e9	560	* @param ttl the TTL value to be set in the IP header
tax	0:66300c77c6e9	561	* @param tos the TOS value to be set in the IP header
tax	0:66300c77c6e9	562	* @param proto the PROTOCOL to be set in the IP header
tax	0:66300c77c6e9	563	* @param netif the netif on which to send this packet
tax	0:66300c77c6e9	564	* @return ERR_OK if the packet was sent OK
tax	0:66300c77c6e9	565	* ERR_BUF if p doesn't have enough space for IP/LINK headers
tax	0:66300c77c6e9	566	* returns errors returned by netif->output
tax	0:66300c77c6e9	567	*
tax	0:66300c77c6e9	568	* @note ip_id: RFC791 "some host may be able to simply use
tax	0:66300c77c6e9	569	* unique identifiers independent of destination"
tax	0:66300c77c6e9	570	*/
tax	0:66300c77c6e9	571	err_t
tax	0:66300c77c6e9	572	ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
tax	0:66300c77c6e9	573	u8_t ttl, u8_t tos,
tax	0:66300c77c6e9	574	u8_t proto, struct netif *netif)
tax	0:66300c77c6e9	575	{
tax	0:66300c77c6e9	576	#if IP_OPTIONS_SEND
tax	0:66300c77c6e9	577	return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
tax	0:66300c77c6e9	578	}
tax	0:66300c77c6e9	579
tax	0:66300c77c6e9	580	/**
tax	0:66300c77c6e9	581	* Same as ip_output_if() but with the possibility to include IP options:
tax	0:66300c77c6e9	582	*
tax	0:66300c77c6e9	583	* @ param ip_options pointer to the IP options, copied into the IP header
tax	0:66300c77c6e9	584	* @ param optlen length of ip_options
tax	0:66300c77c6e9	585	*/
tax	0:66300c77c6e9	586	err_t ip_output_if_opt(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
tax	0:66300c77c6e9	587	u8_t ttl, u8_t tos, u8_t proto, struct netif netif, void ip_options,
tax	0:66300c77c6e9	588	u16_t optlen)
tax	0:66300c77c6e9	589	{
tax	0:66300c77c6e9	590	#endif /* IP_OPTIONS_SEND */
tax	0:66300c77c6e9	591	struct ip_hdr *iphdr;
tax	0:66300c77c6e9	592	ip_addr_t dest_addr;
tax	0:66300c77c6e9	593	#if CHECKSUM_GEN_IP_INLINE
tax	0:66300c77c6e9	594	u32_t chk_sum = 0;
tax	0:66300c77c6e9	595	#endif /* CHECKSUM_GEN_IP_INLINE */
tax	0:66300c77c6e9	596
tax	0:66300c77c6e9	597	/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
tax	0:66300c77c6e9	598	gets altered as the packet is passed down the stack */
tax	0:66300c77c6e9	599	LWIP_ASSERT("p->ref == 1", p->ref == 1);
tax	0:66300c77c6e9	600
tax	0:66300c77c6e9	601	snmp_inc_ipoutrequests();
tax	0:66300c77c6e9	602
tax	0:66300c77c6e9	603	/* Should the IP header be generated or is it already included in p? */
tax	0:66300c77c6e9	604	if (dest != IP_HDRINCL) {
tax	0:66300c77c6e9	605	u16_t ip_hlen = IP_HLEN;
tax	0:66300c77c6e9	606	#if IP_OPTIONS_SEND
tax	0:66300c77c6e9	607	u16_t optlen_aligned = 0;
tax	0:66300c77c6e9	608	if (optlen != 0) {
tax	0:66300c77c6e9	609	#if CHECKSUM_GEN_IP_INLINE
tax	0:66300c77c6e9	610	int i;
tax	0:66300c77c6e9	611	#endif /* CHECKSUM_GEN_IP_INLINE */
tax	0:66300c77c6e9	612	/* round up to a multiple of 4 */
tax	0:66300c77c6e9	613	optlen_aligned = ((optlen + 3) & ~3);
tax	0:66300c77c6e9	614	ip_hlen += optlen_aligned;
tax	0:66300c77c6e9	615	/* First write in the IP options */
tax	0:66300c77c6e9	616	if (pbuf_header(p, optlen_aligned)) {
tax	0:66300c77c6e9	617	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
tax	0:66300c77c6e9	618	IP_STATS_INC(ip.err);
tax	0:66300c77c6e9	619	snmp_inc_ipoutdiscards();
tax	0:66300c77c6e9	620	return ERR_BUF;
tax	0:66300c77c6e9	621	}
tax	0:66300c77c6e9	622	MEMCPY(p->payload, ip_options, optlen);
tax	0:66300c77c6e9	623	if (optlen < optlen_aligned) {
tax	0:66300c77c6e9	624	/* zero the remaining bytes */
tax	0:66300c77c6e9	625	memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
tax	0:66300c77c6e9	626	}
tax	0:66300c77c6e9	627	#if CHECKSUM_GEN_IP_INLINE
tax	0:66300c77c6e9	628	for (i = 0; i < optlen_aligned; i += sizeof(u16_t)) {
tax	0:66300c77c6e9	629	chk_sum += ((u16_t*)p->payload)[i];
tax	0:66300c77c6e9	630	}
tax	0:66300c77c6e9	631	#endif /* CHECKSUM_GEN_IP_INLINE */
tax	0:66300c77c6e9	632	}
tax	0:66300c77c6e9	633	#endif /* IP_OPTIONS_SEND */
tax	0:66300c77c6e9	634	/* generate IP header */
tax	0:66300c77c6e9	635	if (pbuf_header(p, IP_HLEN)) {
tax	0:66300c77c6e9	636	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("ip_output: not enough room for IP header in pbuf\n"));
tax	0:66300c77c6e9	637
tax	0:66300c77c6e9	638	IP_STATS_INC(ip.err);
tax	0:66300c77c6e9	639	snmp_inc_ipoutdiscards();
tax	0:66300c77c6e9	640	return ERR_BUF;
tax	0:66300c77c6e9	641	}
tax	0:66300c77c6e9	642
tax	0:66300c77c6e9	643	iphdr = (struct ip_hdr *)p->payload;
tax	0:66300c77c6e9	644	LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
tax	0:66300c77c6e9	645	(p->len >= sizeof(struct ip_hdr)));
tax	0:66300c77c6e9	646
tax	0:66300c77c6e9	647	IPH_TTL_SET(iphdr, ttl);
tax	0:66300c77c6e9	648	IPH_PROTO_SET(iphdr, proto);
tax	0:66300c77c6e9	649	#if CHECKSUM_GEN_IP_INLINE
tax	0:66300c77c6e9	650	chk_sum += LWIP_MAKE_U16(proto, ttl);
tax	0:66300c77c6e9	651	#endif /* CHECKSUM_GEN_IP_INLINE */
tax	0:66300c77c6e9	652
tax	0:66300c77c6e9	653	/* dest cannot be NULL here */
tax	0:66300c77c6e9	654	ip_addr_copy(iphdr->dest, *dest);
tax	0:66300c77c6e9	655	#if CHECKSUM_GEN_IP_INLINE
tax	0:66300c77c6e9	656	chk_sum += ip4_addr_get_u32(&iphdr->dest) & 0xFFFF;
tax	0:66300c77c6e9	657	chk_sum += ip4_addr_get_u32(&iphdr->dest) >> 16;
tax	0:66300c77c6e9	658	#endif /* CHECKSUM_GEN_IP_INLINE */
tax	0:66300c77c6e9	659
tax	0:66300c77c6e9	660	IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
tax	0:66300c77c6e9	661	#if CHECKSUM_GEN_IP_INLINE
tax	0:66300c77c6e9	662	chk_sum += iphdr->_v_hl_tos;
tax	0:66300c77c6e9	663	#endif /* CHECKSUM_GEN_IP_INLINE */
tax	0:66300c77c6e9	664	IPH_LEN_SET(iphdr, htons(p->tot_len));
tax	0:66300c77c6e9	665	#if CHECKSUM_GEN_IP_INLINE
tax	0:66300c77c6e9	666	chk_sum += iphdr->_len;
tax	0:66300c77c6e9	667	#endif /* CHECKSUM_GEN_IP_INLINE */
tax	0:66300c77c6e9	668	IPH_OFFSET_SET(iphdr, 0);
tax	0:66300c77c6e9	669	IPH_ID_SET(iphdr, htons(ip_id));
tax	0:66300c77c6e9	670	#if CHECKSUM_GEN_IP_INLINE
tax	0:66300c77c6e9	671	chk_sum += iphdr->_id;
tax	0:66300c77c6e9	672	#endif /* CHECKSUM_GEN_IP_INLINE */
tax	0:66300c77c6e9	673	++ip_id;
tax	0:66300c77c6e9	674
tax	0:66300c77c6e9	675	if (ip_addr_isany(src)) {
tax	0:66300c77c6e9	676	ip_addr_copy(iphdr->src, netif->ip_addr);
tax	0:66300c77c6e9	677	} else {
tax	0:66300c77c6e9	678	/* src cannot be NULL here */
tax	0:66300c77c6e9	679	ip_addr_copy(iphdr->src, *src);
tax	0:66300c77c6e9	680	}
tax	0:66300c77c6e9	681
tax	0:66300c77c6e9	682	#if CHECKSUM_GEN_IP_INLINE
tax	0:66300c77c6e9	683	chk_sum += ip4_addr_get_u32(&iphdr->src) & 0xFFFF;
tax	0:66300c77c6e9	684	chk_sum += ip4_addr_get_u32(&iphdr->src) >> 16;
tax	0:66300c77c6e9	685	chk_sum = (chk_sum >> 16) + (chk_sum & 0xFFFF);
tax	0:66300c77c6e9	686	chk_sum = (chk_sum >> 16) + chk_sum;
tax	0:66300c77c6e9	687	chk_sum = ~chk_sum;
tax	0:66300c77c6e9	688	iphdr->_chksum = chk_sum; /* network order */
tax	0:66300c77c6e9	689	#else /* CHECKSUM_GEN_IP_INLINE */
tax	0:66300c77c6e9	690	IPH_CHKSUM_SET(iphdr, 0);
tax	0:66300c77c6e9	691	#if CHECKSUM_GEN_IP
tax	0:66300c77c6e9	692	IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
tax	0:66300c77c6e9	693	#endif
tax	0:66300c77c6e9	694	#endif /* CHECKSUM_GEN_IP_INLINE */
tax	0:66300c77c6e9	695	} else {
tax	0:66300c77c6e9	696	/* IP header already included in p */
tax	0:66300c77c6e9	697	iphdr = (struct ip_hdr *)p->payload;
tax	0:66300c77c6e9	698	ip_addr_copy(dest_addr, iphdr->dest);
tax	0:66300c77c6e9	699	dest = &dest_addr;
tax	0:66300c77c6e9	700	}
tax	0:66300c77c6e9	701
tax	0:66300c77c6e9	702	IP_STATS_INC(ip.xmit);
tax	0:66300c77c6e9	703
tax	0:66300c77c6e9	704	LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
tax	0:66300c77c6e9	705	ip_debug_print(p);
tax	0:66300c77c6e9	706
tax	0:66300c77c6e9	707	#if ENABLE_LOOPBACK
tax	0:66300c77c6e9	708	if (ip_addr_cmp(dest, &netif->ip_addr)) {
tax	0:66300c77c6e9	709	/* Packet to self, enqueue it for loopback */
tax	0:66300c77c6e9	710	LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
tax	0:66300c77c6e9	711	return netif_loop_output(netif, p, dest);
tax	0:66300c77c6e9	712	}
tax	0:66300c77c6e9	713	#if LWIP_IGMP
tax	0:66300c77c6e9	714	if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) {
tax	0:66300c77c6e9	715	netif_loop_output(netif, p, dest);
tax	0:66300c77c6e9	716	}
tax	0:66300c77c6e9	717	#endif /* LWIP_IGMP */
tax	0:66300c77c6e9	718	#endif /* ENABLE_LOOPBACK */
tax	0:66300c77c6e9	719	#if IP_FRAG
tax	0:66300c77c6e9	720	/* don't fragment if interface has mtu set to 0 [loopif] */
tax	0:66300c77c6e9	721	if (netif->mtu && (p->tot_len > netif->mtu)) {
tax	0:66300c77c6e9	722	return ip_frag(p, netif, dest);
tax	0:66300c77c6e9	723	}
tax	0:66300c77c6e9	724	#endif /* IP_FRAG */
tax	0:66300c77c6e9	725
tax	0:66300c77c6e9	726	LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
tax	0:66300c77c6e9	727	return netif->output(netif, p, dest);
tax	0:66300c77c6e9	728	}
tax	0:66300c77c6e9	729
tax	0:66300c77c6e9	730	/**
tax	0:66300c77c6e9	731	* Simple interface to ip_output_if. It finds the outgoing network
tax	0:66300c77c6e9	732	* interface and calls upon ip_output_if to do the actual work.
tax	0:66300c77c6e9	733	*
tax	0:66300c77c6e9	734	* @param p the packet to send (p->payload points to the data, e.g. next
tax	0:66300c77c6e9	735	protocol header; if dest == IP_HDRINCL, p already includes an IP
tax	0:66300c77c6e9	736	header and p->payload points to that IP header)
tax	0:66300c77c6e9	737	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
tax	0:66300c77c6e9	738	* IP address of the netif used to send is used as source address)
tax	0:66300c77c6e9	739	* @param dest the destination IP address to send the packet to
tax	0:66300c77c6e9	740	* @param ttl the TTL value to be set in the IP header
tax	0:66300c77c6e9	741	* @param tos the TOS value to be set in the IP header
tax	0:66300c77c6e9	742	* @param proto the PROTOCOL to be set in the IP header
tax	0:66300c77c6e9	743	*
tax	0:66300c77c6e9	744	* @return ERR_RTE if no route is found
tax	0:66300c77c6e9	745	* see ip_output_if() for more return values
tax	0:66300c77c6e9	746	*/
tax	0:66300c77c6e9	747	err_t
tax	0:66300c77c6e9	748	ip_output(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
tax	0:66300c77c6e9	749	u8_t ttl, u8_t tos, u8_t proto)
tax	0:66300c77c6e9	750	{
tax	0:66300c77c6e9	751	struct netif *netif;
tax	0:66300c77c6e9	752
tax	0:66300c77c6e9	753	/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
tax	0:66300c77c6e9	754	gets altered as the packet is passed down the stack */
tax	0:66300c77c6e9	755	LWIP_ASSERT("p->ref == 1", p->ref == 1);
tax	0:66300c77c6e9	756
tax	0:66300c77c6e9	757	if ((netif = ip_route(dest)) == NULL) {
tax	0:66300c77c6e9	758	LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
tax	0:66300c77c6e9	759	ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
tax	0:66300c77c6e9	760	IP_STATS_INC(ip.rterr);
tax	0:66300c77c6e9	761	return ERR_RTE;
tax	0:66300c77c6e9	762	}
tax	0:66300c77c6e9	763
tax	0:66300c77c6e9	764	return ip_output_if(p, src, dest, ttl, tos, proto, netif);
tax	0:66300c77c6e9	765	}
tax	0:66300c77c6e9	766
tax	0:66300c77c6e9	767	#if LWIP_NETIF_HWADDRHINT
tax	0:66300c77c6e9	768	/** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
tax	0:66300c77c6e9	769	* before calling ip_output_if.
tax	0:66300c77c6e9	770	*
tax	0:66300c77c6e9	771	* @param p the packet to send (p->payload points to the data, e.g. next
tax	0:66300c77c6e9	772	protocol header; if dest == IP_HDRINCL, p already includes an IP
tax	0:66300c77c6e9	773	header and p->payload points to that IP header)
tax	0:66300c77c6e9	774	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
tax	0:66300c77c6e9	775	* IP address of the netif used to send is used as source address)
tax	0:66300c77c6e9	776	* @param dest the destination IP address to send the packet to
tax	0:66300c77c6e9	777	* @param ttl the TTL value to be set in the IP header
tax	0:66300c77c6e9	778	* @param tos the TOS value to be set in the IP header
tax	0:66300c77c6e9	779	* @param proto the PROTOCOL to be set in the IP header
tax	0:66300c77c6e9	780	* @param addr_hint address hint pointer set to netif->addr_hint before
tax	0:66300c77c6e9	781	* calling ip_output_if()
tax	0:66300c77c6e9	782	*
tax	0:66300c77c6e9	783	* @return ERR_RTE if no route is found
tax	0:66300c77c6e9	784	* see ip_output_if() for more return values
tax	0:66300c77c6e9	785	*/
tax	0:66300c77c6e9	786	err_t
tax	0:66300c77c6e9	787	ip_output_hinted(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
tax	0:66300c77c6e9	788	u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
tax	0:66300c77c6e9	789	{
tax	0:66300c77c6e9	790	struct netif *netif;
tax	0:66300c77c6e9	791	err_t err;
tax	0:66300c77c6e9	792
tax	0:66300c77c6e9	793	/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
tax	0:66300c77c6e9	794	gets altered as the packet is passed down the stack */
tax	0:66300c77c6e9	795	LWIP_ASSERT("p->ref == 1", p->ref == 1);
tax	0:66300c77c6e9	796
tax	0:66300c77c6e9	797	if ((netif = ip_route(dest)) == NULL) {
tax	0:66300c77c6e9	798	LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
tax	0:66300c77c6e9	799	ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
tax	0:66300c77c6e9	800	IP_STATS_INC(ip.rterr);
tax	0:66300c77c6e9	801	return ERR_RTE;
tax	0:66300c77c6e9	802	}
tax	0:66300c77c6e9	803
tax	0:66300c77c6e9	804	netif->addr_hint = addr_hint;
tax	0:66300c77c6e9	805	err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
tax	0:66300c77c6e9	806	netif->addr_hint = NULL;
tax	0:66300c77c6e9	807
tax	0:66300c77c6e9	808	return err;
tax	0:66300c77c6e9	809	}
tax	0:66300c77c6e9	810	#endif /* LWIP_NETIF_HWADDRHINT*/
tax	0:66300c77c6e9	811
tax	0:66300c77c6e9	812	#if IP_DEBUG
tax	0:66300c77c6e9	813	/* Print an IP header by using LWIP_DEBUGF
tax	0:66300c77c6e9	814	* @param p an IP packet, p->payload pointing to the IP header
tax	0:66300c77c6e9	815	*/
tax	0:66300c77c6e9	816	void
tax	0:66300c77c6e9	817	ip_debug_print(struct pbuf *p)
tax	0:66300c77c6e9	818	{
tax	0:66300c77c6e9	819	struct ip_hdr iphdr = (struct ip_hdr )p->payload;
tax	0:66300c77c6e9	820	u8_t *payload;
tax	0:66300c77c6e9	821
tax	0:66300c77c6e9	822	payload = (u8_t *)iphdr + IP_HLEN;
tax	0:66300c77c6e9	823
tax	0:66300c77c6e9	824	LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
tax	0:66300c77c6e9	825	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
tax	0:66300c77c6e9	826	LWIP_DEBUGF(IP_DEBUG, ("\|%2"S16_F" \|%2"S16_F" \| 0x%02"X16_F" \| %5"U16_F" \| (v, hl, tos, len)\n",
tax	0:66300c77c6e9	827	IPH_V(iphdr),
tax	0:66300c77c6e9	828	IPH_HL(iphdr),
tax	0:66300c77c6e9	829	IPH_TOS(iphdr),
tax	0:66300c77c6e9	830	ntohs(IPH_LEN(iphdr))));
tax	0:66300c77c6e9	831	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
tax	0:66300c77c6e9	832	LWIP_DEBUGF(IP_DEBUG, ("\| %5"U16_F" \|%"U16_F"%"U16_F"%"U16_F"\| %4"U16_F" \| (id, flags, offset)\n",
tax	0:66300c77c6e9	833	ntohs(IPH_ID(iphdr)),
tax	0:66300c77c6e9	834	ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
tax	0:66300c77c6e9	835	ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
tax	0:66300c77c6e9	836	ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
tax	0:66300c77c6e9	837	ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
tax	0:66300c77c6e9	838	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
tax	0:66300c77c6e9	839	LWIP_DEBUGF(IP_DEBUG, ("\| %3"U16_F" \| %3"U16_F" \| 0x%04"X16_F" \| (ttl, proto, chksum)\n",
tax	0:66300c77c6e9	840	IPH_TTL(iphdr),
tax	0:66300c77c6e9	841	IPH_PROTO(iphdr),
tax	0:66300c77c6e9	842	ntohs(IPH_CHKSUM(iphdr))));
tax	0:66300c77c6e9	843	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
tax	0:66300c77c6e9	844	LWIP_DEBUGF(IP_DEBUG, ("\| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| (src)\n",
tax	0:66300c77c6e9	845	ip4_addr1_16(&iphdr->src),
tax	0:66300c77c6e9	846	ip4_addr2_16(&iphdr->src),
tax	0:66300c77c6e9	847	ip4_addr3_16(&iphdr->src),
tax	0:66300c77c6e9	848	ip4_addr4_16(&iphdr->src)));
tax	0:66300c77c6e9	849	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
tax	0:66300c77c6e9	850	LWIP_DEBUGF(IP_DEBUG, ("\| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| (dest)\n",
tax	0:66300c77c6e9	851	ip4_addr1_16(&iphdr->dest),
tax	0:66300c77c6e9	852	ip4_addr2_16(&iphdr->dest),
tax	0:66300c77c6e9	853	ip4_addr3_16(&iphdr->dest),
tax	0:66300c77c6e9	854	ip4_addr4_16(&iphdr->dest)));
tax	0:66300c77c6e9	855	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
tax	0:66300c77c6e9	856	}
tax	0:66300c77c6e9	857	#endif /* IP_DEBUG */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	29 Mar 2011
Imports:	16
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

lwip/core/ipv4/ip.c@0:66300c77c6e9, 2011-03-29 (annotated)

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