StrippedDownNetServices - This library is stripped down version of NetServi…

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idinor Launcher / StrippedDownNetServices

This library is stripped down version of NetServices library. HTTP server and client function is NOT supported.

lwip/core/ipv4/ip.c@0:dcf3c92487ca, 2011-07-20 (annotated)

Committer:: idinor
Date:: Wed Jul 20 11:45:39 2011 +0000
Revision:: 0:dcf3c92487ca

Who changed what in which revision?

User	Revision	Line number	New contents of line
idinor	0:dcf3c92487ca	1	/**
idinor	0:dcf3c92487ca	2	* @file
idinor	0:dcf3c92487ca	3	* This is the IPv4 layer implementation for incoming and outgoing IP traffic.
idinor	0:dcf3c92487ca	4	*
idinor	0:dcf3c92487ca	5	* @see ip_frag.c
idinor	0:dcf3c92487ca	6	*
idinor	0:dcf3c92487ca	7	*/
idinor	0:dcf3c92487ca	8
idinor	0:dcf3c92487ca	9	/*
idinor	0:dcf3c92487ca	10	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
idinor	0:dcf3c92487ca	11	* All rights reserved.
idinor	0:dcf3c92487ca	12	*
idinor	0:dcf3c92487ca	13	* Redistribution and use in source and binary forms, with or without modification,
idinor	0:dcf3c92487ca	14	* are permitted provided that the following conditions are met:
idinor	0:dcf3c92487ca	15	*
idinor	0:dcf3c92487ca	16	* 1. Redistributions of source code must retain the above copyright notice,
idinor	0:dcf3c92487ca	17	* this list of conditions and the following disclaimer.
idinor	0:dcf3c92487ca	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
idinor	0:dcf3c92487ca	19	* this list of conditions and the following disclaimer in the documentation
idinor	0:dcf3c92487ca	20	* and/or other materials provided with the distribution.
idinor	0:dcf3c92487ca	21	* 3. The name of the author may not be used to endorse or promote products
idinor	0:dcf3c92487ca	22	* derived from this software without specific prior written permission.
idinor	0:dcf3c92487ca	23	*
idinor	0:dcf3c92487ca	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
idinor	0:dcf3c92487ca	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
idinor	0:dcf3c92487ca	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
idinor	0:dcf3c92487ca	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
idinor	0:dcf3c92487ca	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
idinor	0:dcf3c92487ca	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
idinor	0:dcf3c92487ca	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
idinor	0:dcf3c92487ca	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
idinor	0:dcf3c92487ca	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
idinor	0:dcf3c92487ca	33	* OF SUCH DAMAGE.
idinor	0:dcf3c92487ca	34	*
idinor	0:dcf3c92487ca	35	* This file is part of the lwIP TCP/IP stack.
idinor	0:dcf3c92487ca	36	*
idinor	0:dcf3c92487ca	37	* Author: Adam Dunkels <adam@sics.se>
idinor	0:dcf3c92487ca	38	*
idinor	0:dcf3c92487ca	39	*/
idinor	0:dcf3c92487ca	40
idinor	0:dcf3c92487ca	41	#include "lwip/opt.h"
idinor	0:dcf3c92487ca	42	#include "lwip/ip.h"
idinor	0:dcf3c92487ca	43	#include "lwip/def.h"
idinor	0:dcf3c92487ca	44	#include "lwip/mem.h"
idinor	0:dcf3c92487ca	45	#include "lwip/ip_frag.h"
idinor	0:dcf3c92487ca	46	#include "lwip/inet_chksum.h"
idinor	0:dcf3c92487ca	47	#include "lwip/netif.h"
idinor	0:dcf3c92487ca	48	#include "lwip/icmp.h"
idinor	0:dcf3c92487ca	49	#include "lwip/igmp.h"
idinor	0:dcf3c92487ca	50	#include "lwip/raw.h"
idinor	0:dcf3c92487ca	51	#include "lwip/udp.h"
idinor	0:dcf3c92487ca	52	#include "lwip/tcp_impl.h"
idinor	0:dcf3c92487ca	53	#include "lwip/snmp.h"
idinor	0:dcf3c92487ca	54	#include "lwip/dhcp.h"
idinor	0:dcf3c92487ca	55	#include "lwip/autoip.h"
idinor	0:dcf3c92487ca	56	#include "lwip/stats.h"
idinor	0:dcf3c92487ca	57	#include "arch/perf.h"
idinor	0:dcf3c92487ca	58
idinor	0:dcf3c92487ca	59	#include <string.h>
idinor	0:dcf3c92487ca	60
idinor	0:dcf3c92487ca	61	/** Set this to 0 in the rare case of wanting to call an extra function to
idinor	0:dcf3c92487ca	62	* generate the IP checksum (in contrast to calculating it on-the-fly). */
idinor	0:dcf3c92487ca	63	#ifndef LWIP_INLINE_IP_CHKSUM
idinor	0:dcf3c92487ca	64	#define LWIP_INLINE_IP_CHKSUM 1
idinor	0:dcf3c92487ca	65	#endif
idinor	0:dcf3c92487ca	66	#if LWIP_INLINE_IP_CHKSUM && CHECKSUM_GEN_IP
idinor	0:dcf3c92487ca	67	#define CHECKSUM_GEN_IP_INLINE 1
idinor	0:dcf3c92487ca	68	#else
idinor	0:dcf3c92487ca	69	#define CHECKSUM_GEN_IP_INLINE 0
idinor	0:dcf3c92487ca	70	#endif
idinor	0:dcf3c92487ca	71
idinor	0:dcf3c92487ca	72	#if LWIP_DHCP \|\| defined(LWIP_IP_ACCEPT_UDP_PORT)
idinor	0:dcf3c92487ca	73	#define IP_ACCEPT_LINK_LAYER_ADDRESSING 1
idinor	0:dcf3c92487ca	74
idinor	0:dcf3c92487ca	75	/** Some defines for DHCP to let link-layer-addressed packets through while the
idinor	0:dcf3c92487ca	76	* netif is down.
idinor	0:dcf3c92487ca	77	* To use this in your own application/protocol, define LWIP_IP_ACCEPT_UDP_PORT
idinor	0:dcf3c92487ca	78	* to return 1 if the port is accepted and 0 if the port is not accepted.
idinor	0:dcf3c92487ca	79	*/
idinor	0:dcf3c92487ca	80	#if LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT)
idinor	0:dcf3c92487ca	81	/* accept DHCP client port and custom port */
idinor	0:dcf3c92487ca	82	#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (((port) == PP_NTOHS(DHCP_CLIENT_PORT)) \
idinor	0:dcf3c92487ca	83	\|\| (LWIP_IP_ACCEPT_UDP_PORT(port)))
idinor	0:dcf3c92487ca	84	#elif defined(LWIP_IP_ACCEPT_UDP_PORT) /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
idinor	0:dcf3c92487ca	85	/* accept custom port only */
idinor	0:dcf3c92487ca	86	#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (LWIP_IP_ACCEPT_UDP_PORT(dst_port))
idinor	0:dcf3c92487ca	87	#else /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
idinor	0:dcf3c92487ca	88	/* accept DHCP client port only */
idinor	0:dcf3c92487ca	89	#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) ((port) == PP_NTOHS(DHCP_CLIENT_PORT))
idinor	0:dcf3c92487ca	90	#endif /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
idinor	0:dcf3c92487ca	91
idinor	0:dcf3c92487ca	92	#else /* LWIP_DHCP */
idinor	0:dcf3c92487ca	93	#define IP_ACCEPT_LINK_LAYER_ADDRESSING 0
idinor	0:dcf3c92487ca	94	#endif /* LWIP_DHCP */
idinor	0:dcf3c92487ca	95
idinor	0:dcf3c92487ca	96	/**
idinor	0:dcf3c92487ca	97	* The interface that provided the packet for the current callback
idinor	0:dcf3c92487ca	98	* invocation.
idinor	0:dcf3c92487ca	99	*/
idinor	0:dcf3c92487ca	100	struct netif *current_netif;
idinor	0:dcf3c92487ca	101
idinor	0:dcf3c92487ca	102	/**
idinor	0:dcf3c92487ca	103	* Header of the input packet currently being processed.
idinor	0:dcf3c92487ca	104	*/
idinor	0:dcf3c92487ca	105	const struct ip_hdr *current_header;
idinor	0:dcf3c92487ca	106	/** Source IP address of current_header */
idinor	0:dcf3c92487ca	107	ip_addr_t current_iphdr_src;
idinor	0:dcf3c92487ca	108	/** Destination IP address of current_header */
idinor	0:dcf3c92487ca	109	ip_addr_t current_iphdr_dest;
idinor	0:dcf3c92487ca	110
idinor	0:dcf3c92487ca	111	/** The IP header ID of the next outgoing IP packet */
idinor	0:dcf3c92487ca	112	static u16_t ip_id;
idinor	0:dcf3c92487ca	113
idinor	0:dcf3c92487ca	114	/**
idinor	0:dcf3c92487ca	115	* Finds the appropriate network interface for a given IP address. It
idinor	0:dcf3c92487ca	116	* searches the list of network interfaces linearly. A match is found
idinor	0:dcf3c92487ca	117	* if the masked IP address of the network interface equals the masked
idinor	0:dcf3c92487ca	118	* IP address given to the function.
idinor	0:dcf3c92487ca	119	*
idinor	0:dcf3c92487ca	120	* @param dest the destination IP address for which to find the route
idinor	0:dcf3c92487ca	121	* @return the netif on which to send to reach dest
idinor	0:dcf3c92487ca	122	*/
idinor	0:dcf3c92487ca	123	struct netif *
idinor	0:dcf3c92487ca	124	ip_route(ip_addr_t *dest)
idinor	0:dcf3c92487ca	125	{
idinor	0:dcf3c92487ca	126	struct netif *netif;
idinor	0:dcf3c92487ca	127
idinor	0:dcf3c92487ca	128	/* iterate through netifs */
idinor	0:dcf3c92487ca	129	for(netif = netif_list; netif != NULL; netif = netif->next) {
idinor	0:dcf3c92487ca	130	/* network mask matches? */
idinor	0:dcf3c92487ca	131	if (netif_is_up(netif)) {
idinor	0:dcf3c92487ca	132	if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
idinor	0:dcf3c92487ca	133	/* return netif on which to forward IP packet */
idinor	0:dcf3c92487ca	134	return netif;
idinor	0:dcf3c92487ca	135	}
idinor	0:dcf3c92487ca	136	}
idinor	0:dcf3c92487ca	137	}
idinor	0:dcf3c92487ca	138	if ((netif_default == NULL) \|\| (!netif_is_up(netif_default))) {
idinor	0:dcf3c92487ca	139	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("ip_route: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
idinor	0:dcf3c92487ca	140	ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
idinor	0:dcf3c92487ca	141	IP_STATS_INC(ip.rterr);
idinor	0:dcf3c92487ca	142	snmp_inc_ipoutnoroutes();
idinor	0:dcf3c92487ca	143	return NULL;
idinor	0:dcf3c92487ca	144	}
idinor	0:dcf3c92487ca	145	/* no matching netif found, use default netif */
idinor	0:dcf3c92487ca	146	return netif_default;
idinor	0:dcf3c92487ca	147	}
idinor	0:dcf3c92487ca	148
idinor	0:dcf3c92487ca	149	#if IP_FORWARD
idinor	0:dcf3c92487ca	150	/**
idinor	0:dcf3c92487ca	151	* Forwards an IP packet. It finds an appropriate route for the
idinor	0:dcf3c92487ca	152	* packet, decrements the TTL value of the packet, adjusts the
idinor	0:dcf3c92487ca	153	* checksum and outputs the packet on the appropriate interface.
idinor	0:dcf3c92487ca	154	*
idinor	0:dcf3c92487ca	155	* @param p the packet to forward (p->payload points to IP header)
idinor	0:dcf3c92487ca	156	* @param iphdr the IP header of the input packet
idinor	0:dcf3c92487ca	157	* @param inp the netif on which this packet was received
idinor	0:dcf3c92487ca	158	*/
idinor	0:dcf3c92487ca	159	static void
idinor	0:dcf3c92487ca	160	ip_forward(struct pbuf p, struct ip_hdr iphdr, struct netif *inp)
idinor	0:dcf3c92487ca	161	{
idinor	0:dcf3c92487ca	162	struct netif *netif;
idinor	0:dcf3c92487ca	163
idinor	0:dcf3c92487ca	164	PERF_START;
idinor	0:dcf3c92487ca	165
idinor	0:dcf3c92487ca	166	/* RFC3927 2.7: do not forward link-local addresses */
idinor	0:dcf3c92487ca	167	if (ip_addr_islinklocal(&current_iphdr_dest)) {
idinor	0:dcf3c92487ca	168	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not forwarding LLA %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
idinor	0:dcf3c92487ca	169	ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
idinor	0:dcf3c92487ca	170	ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
idinor	0:dcf3c92487ca	171	goto return_noroute;
idinor	0:dcf3c92487ca	172	}
idinor	0:dcf3c92487ca	173
idinor	0:dcf3c92487ca	174	/* Find network interface where to forward this IP packet to. */
idinor	0:dcf3c92487ca	175	netif = ip_route(&current_iphdr_dest);
idinor	0:dcf3c92487ca	176	if (netif == NULL) {
idinor	0:dcf3c92487ca	177	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
idinor	0:dcf3c92487ca	178	ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
idinor	0:dcf3c92487ca	179	ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
idinor	0:dcf3c92487ca	180	goto return_noroute;
idinor	0:dcf3c92487ca	181	}
idinor	0:dcf3c92487ca	182	/* Do not forward packets onto the same network interface on which
idinor	0:dcf3c92487ca	183	* they arrived. */
idinor	0:dcf3c92487ca	184	if (netif == inp) {
idinor	0:dcf3c92487ca	185	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
idinor	0:dcf3c92487ca	186	goto return_noroute;
idinor	0:dcf3c92487ca	187	}
idinor	0:dcf3c92487ca	188
idinor	0:dcf3c92487ca	189	/* decrement TTL */
idinor	0:dcf3c92487ca	190	IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
idinor	0:dcf3c92487ca	191	/* send ICMP if TTL == 0 */
idinor	0:dcf3c92487ca	192	if (IPH_TTL(iphdr) == 0) {
idinor	0:dcf3c92487ca	193	snmp_inc_ipinhdrerrors();
idinor	0:dcf3c92487ca	194	#if LWIP_ICMP
idinor	0:dcf3c92487ca	195	/* Don't send ICMP messages in response to ICMP messages */
idinor	0:dcf3c92487ca	196	if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
idinor	0:dcf3c92487ca	197	icmp_time_exceeded(p, ICMP_TE_TTL);
idinor	0:dcf3c92487ca	198	}
idinor	0:dcf3c92487ca	199	#endif /* LWIP_ICMP */
idinor	0:dcf3c92487ca	200	return;
idinor	0:dcf3c92487ca	201	}
idinor	0:dcf3c92487ca	202
idinor	0:dcf3c92487ca	203	/* Incrementally update the IP checksum. */
idinor	0:dcf3c92487ca	204	if (IPH_CHKSUM(iphdr) >= PP_HTONS(0xffff - 0x100)) {
idinor	0:dcf3c92487ca	205	IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100) + 1);
idinor	0:dcf3c92487ca	206	} else {
idinor	0:dcf3c92487ca	207	IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100));
idinor	0:dcf3c92487ca	208	}
idinor	0:dcf3c92487ca	209
idinor	0:dcf3c92487ca	210	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
idinor	0:dcf3c92487ca	211	ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
idinor	0:dcf3c92487ca	212	ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
idinor	0:dcf3c92487ca	213
idinor	0:dcf3c92487ca	214	IP_STATS_INC(ip.fw);
idinor	0:dcf3c92487ca	215	IP_STATS_INC(ip.xmit);
idinor	0:dcf3c92487ca	216	snmp_inc_ipforwdatagrams();
idinor	0:dcf3c92487ca	217
idinor	0:dcf3c92487ca	218	PERF_STOP("ip_forward");
idinor	0:dcf3c92487ca	219	/* transmit pbuf on chosen interface */
idinor	0:dcf3c92487ca	220	netif->output(netif, p, &current_iphdr_dest);
idinor	0:dcf3c92487ca	221	return;
idinor	0:dcf3c92487ca	222	return_noroute:
idinor	0:dcf3c92487ca	223	snmp_inc_ipoutnoroutes();
idinor	0:dcf3c92487ca	224	}
idinor	0:dcf3c92487ca	225	#endif /* IP_FORWARD */
idinor	0:dcf3c92487ca	226
idinor	0:dcf3c92487ca	227	/**
idinor	0:dcf3c92487ca	228	* This function is called by the network interface device driver when
idinor	0:dcf3c92487ca	229	* an IP packet is received. The function does the basic checks of the
idinor	0:dcf3c92487ca	230	* IP header such as packet size being at least larger than the header
idinor	0:dcf3c92487ca	231	* size etc. If the packet was not destined for us, the packet is
idinor	0:dcf3c92487ca	232	* forwarded (using ip_forward). The IP checksum is always checked.
idinor	0:dcf3c92487ca	233	*
idinor	0:dcf3c92487ca	234	* Finally, the packet is sent to the upper layer protocol input function.
idinor	0:dcf3c92487ca	235	*
idinor	0:dcf3c92487ca	236	* @param p the received IP packet (p->payload points to IP header)
idinor	0:dcf3c92487ca	237	* @param inp the netif on which this packet was received
idinor	0:dcf3c92487ca	238	* @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
idinor	0:dcf3c92487ca	239	* processed, but currently always returns ERR_OK)
idinor	0:dcf3c92487ca	240	*/
idinor	0:dcf3c92487ca	241	err_t
idinor	0:dcf3c92487ca	242	ip_input(struct pbuf p, struct netif inp)
idinor	0:dcf3c92487ca	243	{
idinor	0:dcf3c92487ca	244	struct ip_hdr *iphdr;
idinor	0:dcf3c92487ca	245	struct netif *netif;
idinor	0:dcf3c92487ca	246	u16_t iphdr_hlen;
idinor	0:dcf3c92487ca	247	u16_t iphdr_len;
idinor	0:dcf3c92487ca	248	#if IP_ACCEPT_LINK_LAYER_ADDRESSING
idinor	0:dcf3c92487ca	249	int check_ip_src=1;
idinor	0:dcf3c92487ca	250	#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
idinor	0:dcf3c92487ca	251
idinor	0:dcf3c92487ca	252	IP_STATS_INC(ip.recv);
idinor	0:dcf3c92487ca	253	snmp_inc_ipinreceives();
idinor	0:dcf3c92487ca	254
idinor	0:dcf3c92487ca	255	/* identify the IP header */
idinor	0:dcf3c92487ca	256	iphdr = (struct ip_hdr *)p->payload;
idinor	0:dcf3c92487ca	257	if (IPH_V(iphdr) != 4) {
idinor	0:dcf3c92487ca	258	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
idinor	0:dcf3c92487ca	259	ip_debug_print(p);
idinor	0:dcf3c92487ca	260	pbuf_free(p);
idinor	0:dcf3c92487ca	261	IP_STATS_INC(ip.err);
idinor	0:dcf3c92487ca	262	IP_STATS_INC(ip.drop);
idinor	0:dcf3c92487ca	263	snmp_inc_ipinhdrerrors();
idinor	0:dcf3c92487ca	264	return ERR_OK;
idinor	0:dcf3c92487ca	265	}
idinor	0:dcf3c92487ca	266
idinor	0:dcf3c92487ca	267	/* obtain IP header length in number of 32-bit words */
idinor	0:dcf3c92487ca	268	iphdr_hlen = IPH_HL(iphdr);
idinor	0:dcf3c92487ca	269	/* calculate IP header length in bytes */
idinor	0:dcf3c92487ca	270	iphdr_hlen *= 4;
idinor	0:dcf3c92487ca	271	/* obtain ip length in bytes */
idinor	0:dcf3c92487ca	272	iphdr_len = ntohs(IPH_LEN(iphdr));
idinor	0:dcf3c92487ca	273
idinor	0:dcf3c92487ca	274	/* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
idinor	0:dcf3c92487ca	275	if ((iphdr_hlen > p->len) \|\| (iphdr_len > p->tot_len)) {
idinor	0:dcf3c92487ca	276	if (iphdr_hlen > p->len) {
idinor	0:dcf3c92487ca	277	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
idinor	0:dcf3c92487ca	278	("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
idinor	0:dcf3c92487ca	279	iphdr_hlen, p->len));
idinor	0:dcf3c92487ca	280	}
idinor	0:dcf3c92487ca	281	if (iphdr_len > p->tot_len) {
idinor	0:dcf3c92487ca	282	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
idinor	0:dcf3c92487ca	283	("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
idinor	0:dcf3c92487ca	284	iphdr_len, p->tot_len));
idinor	0:dcf3c92487ca	285	}
idinor	0:dcf3c92487ca	286	/* free (drop) packet pbufs */
idinor	0:dcf3c92487ca	287	pbuf_free(p);
idinor	0:dcf3c92487ca	288	IP_STATS_INC(ip.lenerr);
idinor	0:dcf3c92487ca	289	IP_STATS_INC(ip.drop);
idinor	0:dcf3c92487ca	290	snmp_inc_ipindiscards();
idinor	0:dcf3c92487ca	291	return ERR_OK;
idinor	0:dcf3c92487ca	292	}
idinor	0:dcf3c92487ca	293
idinor	0:dcf3c92487ca	294	/* verify checksum */
idinor	0:dcf3c92487ca	295	#if CHECKSUM_CHECK_IP
idinor	0:dcf3c92487ca	296	if (inet_chksum(iphdr, iphdr_hlen) != 0) {
idinor	0:dcf3c92487ca	297
idinor	0:dcf3c92487ca	298	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
idinor	0:dcf3c92487ca	299	("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
idinor	0:dcf3c92487ca	300	ip_debug_print(p);
idinor	0:dcf3c92487ca	301	pbuf_free(p);
idinor	0:dcf3c92487ca	302	IP_STATS_INC(ip.chkerr);
idinor	0:dcf3c92487ca	303	IP_STATS_INC(ip.drop);
idinor	0:dcf3c92487ca	304	snmp_inc_ipinhdrerrors();
idinor	0:dcf3c92487ca	305	return ERR_OK;
idinor	0:dcf3c92487ca	306	}
idinor	0:dcf3c92487ca	307	#endif
idinor	0:dcf3c92487ca	308
idinor	0:dcf3c92487ca	309	/* Trim pbuf. This should have been done at the netif layer,
idinor	0:dcf3c92487ca	310	* but we'll do it anyway just to be sure that its done. */
idinor	0:dcf3c92487ca	311	pbuf_realloc(p, iphdr_len);
idinor	0:dcf3c92487ca	312
idinor	0:dcf3c92487ca	313	/* copy IP addresses to aligned ip_addr_t */
idinor	0:dcf3c92487ca	314	ip_addr_copy(current_iphdr_dest, iphdr->dest);
idinor	0:dcf3c92487ca	315	ip_addr_copy(current_iphdr_src, iphdr->src);
idinor	0:dcf3c92487ca	316
idinor	0:dcf3c92487ca	317	/* match packet against an interface, i.e. is this packet for us? */
idinor	0:dcf3c92487ca	318	#if LWIP_IGMP
idinor	0:dcf3c92487ca	319	if (ip_addr_ismulticast(&current_iphdr_dest)) {
idinor	0:dcf3c92487ca	320	if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &current_iphdr_dest))) {
idinor	0:dcf3c92487ca	321	netif = inp;
idinor	0:dcf3c92487ca	322	} else {
idinor	0:dcf3c92487ca	323	netif = NULL;
idinor	0:dcf3c92487ca	324	}
idinor	0:dcf3c92487ca	325	} else
idinor	0:dcf3c92487ca	326	#endif /* LWIP_IGMP */
idinor	0:dcf3c92487ca	327	{
idinor	0:dcf3c92487ca	328	/* start trying with inp. if that's not acceptable, start walking the
idinor	0:dcf3c92487ca	329	list of configured netifs.
idinor	0:dcf3c92487ca	330	'first' is used as a boolean to mark whether we started walking the list */
idinor	0:dcf3c92487ca	331	int first = 1;
idinor	0:dcf3c92487ca	332	netif = inp;
idinor	0:dcf3c92487ca	333	do {
idinor	0:dcf3c92487ca	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",
idinor	0:dcf3c92487ca	335	ip4_addr_get_u32(&iphdr->dest), ip4_addr_get_u32(&netif->ip_addr),
idinor	0:dcf3c92487ca	336	ip4_addr_get_u32(&iphdr->dest) & ip4_addr_get_u32(&netif->netmask),
idinor	0:dcf3c92487ca	337	ip4_addr_get_u32(&netif->ip_addr) & ip4_addr_get_u32(&netif->netmask),
idinor	0:dcf3c92487ca	338	ip4_addr_get_u32(&iphdr->dest) & ~ip4_addr_get_u32(&netif->netmask)));
idinor	0:dcf3c92487ca	339
idinor	0:dcf3c92487ca	340	/* interface is up and configured? */
idinor	0:dcf3c92487ca	341	if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
idinor	0:dcf3c92487ca	342	/* unicast to this interface address? */
idinor	0:dcf3c92487ca	343	if (ip_addr_cmp(&current_iphdr_dest, &(netif->ip_addr)) \|\|
idinor	0:dcf3c92487ca	344	/* or broadcast on this interface network address? */
idinor	0:dcf3c92487ca	345	ip_addr_isbroadcast(&current_iphdr_dest, netif)) {
idinor	0:dcf3c92487ca	346	LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
idinor	0:dcf3c92487ca	347	netif->name[0], netif->name[1]));
idinor	0:dcf3c92487ca	348	/* break out of for loop */
idinor	0:dcf3c92487ca	349	break;
idinor	0:dcf3c92487ca	350	}
idinor	0:dcf3c92487ca	351	#if LWIP_AUTOIP
idinor	0:dcf3c92487ca	352	/* connections to link-local addresses must persist after changing
idinor	0:dcf3c92487ca	353	the netif's address (RFC3927 ch. 1.9) */
idinor	0:dcf3c92487ca	354	if ((netif->autoip != NULL) &&
idinor	0:dcf3c92487ca	355	ip_addr_cmp(&current_iphdr_dest, &(netif->autoip->llipaddr))) {
idinor	0:dcf3c92487ca	356	LWIP_DEBUGF(IP_DEBUG, ("ip_input: LLA packet accepted on interface %c%c\n",
idinor	0:dcf3c92487ca	357	netif->name[0], netif->name[1]));
idinor	0:dcf3c92487ca	358	/* break out of for loop */
idinor	0:dcf3c92487ca	359	break;
idinor	0:dcf3c92487ca	360	}
idinor	0:dcf3c92487ca	361	#endif /* LWIP_AUTOIP */
idinor	0:dcf3c92487ca	362	}
idinor	0:dcf3c92487ca	363	if (first) {
idinor	0:dcf3c92487ca	364	first = 0;
idinor	0:dcf3c92487ca	365	netif = netif_list;
idinor	0:dcf3c92487ca	366	} else {
idinor	0:dcf3c92487ca	367	netif = netif->next;
idinor	0:dcf3c92487ca	368	}
idinor	0:dcf3c92487ca	369	if (netif == inp) {
idinor	0:dcf3c92487ca	370	netif = netif->next;
idinor	0:dcf3c92487ca	371	}
idinor	0:dcf3c92487ca	372	} while(netif != NULL);
idinor	0:dcf3c92487ca	373	}
idinor	0:dcf3c92487ca	374
idinor	0:dcf3c92487ca	375	#if IP_ACCEPT_LINK_LAYER_ADDRESSING
idinor	0:dcf3c92487ca	376	/* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
idinor	0:dcf3c92487ca	377	* using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
idinor	0:dcf3c92487ca	378	* According to RFC 1542 section 3.1.1, referred by RFC 2131).
idinor	0:dcf3c92487ca	379	*
idinor	0:dcf3c92487ca	380	* If you want to accept private broadcast communication while a netif is down,
idinor	0:dcf3c92487ca	381	* define LWIP_IP_ACCEPT_UDP_PORT(dst_port), e.g.:
idinor	0:dcf3c92487ca	382	*
idinor	0:dcf3c92487ca	383	* #define LWIP_IP_ACCEPT_UDP_PORT(dst_port) ((dst_port) == PP_NTOHS(12345))
idinor	0:dcf3c92487ca	384	*/
idinor	0:dcf3c92487ca	385	if (netif == NULL) {
idinor	0:dcf3c92487ca	386	/* remote port is DHCP server? */
idinor	0:dcf3c92487ca	387	if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
idinor	0:dcf3c92487ca	388	struct udp_hdr udphdr = (struct udp_hdr )((u8_t *)iphdr + iphdr_hlen);
idinor	0:dcf3c92487ca	389	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
idinor	0:dcf3c92487ca	390	ntohs(udphdr->dest)));
idinor	0:dcf3c92487ca	391	if (IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(udphdr->dest)) {
idinor	0:dcf3c92487ca	392	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE, ("ip_input: DHCP packet accepted.\n"));
idinor	0:dcf3c92487ca	393	netif = inp;
idinor	0:dcf3c92487ca	394	check_ip_src = 0;
idinor	0:dcf3c92487ca	395	}
idinor	0:dcf3c92487ca	396	}
idinor	0:dcf3c92487ca	397	}
idinor	0:dcf3c92487ca	398	#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
idinor	0:dcf3c92487ca	399
idinor	0:dcf3c92487ca	400	/* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
idinor	0:dcf3c92487ca	401	#if IP_ACCEPT_LINK_LAYER_ADDRESSING
idinor	0:dcf3c92487ca	402	/* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
idinor	0:dcf3c92487ca	403	if (check_ip_src && !ip_addr_isany(&current_iphdr_src))
idinor	0:dcf3c92487ca	404	#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
idinor	0:dcf3c92487ca	405	{ if ((ip_addr_isbroadcast(&current_iphdr_src, inp)) \|\|
idinor	0:dcf3c92487ca	406	(ip_addr_ismulticast(&current_iphdr_src))) {
idinor	0:dcf3c92487ca	407	/* packet source is not valid */
idinor	0:dcf3c92487ca	408	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("ip_input: packet source is not valid.\n"));
idinor	0:dcf3c92487ca	409	/* free (drop) packet pbufs */
idinor	0:dcf3c92487ca	410	pbuf_free(p);
idinor	0:dcf3c92487ca	411	IP_STATS_INC(ip.drop);
idinor	0:dcf3c92487ca	412	snmp_inc_ipinaddrerrors();
idinor	0:dcf3c92487ca	413	snmp_inc_ipindiscards();
idinor	0:dcf3c92487ca	414	return ERR_OK;
idinor	0:dcf3c92487ca	415	}
idinor	0:dcf3c92487ca	416	}
idinor	0:dcf3c92487ca	417
idinor	0:dcf3c92487ca	418	/* packet not for us? */
idinor	0:dcf3c92487ca	419	if (netif == NULL) {
idinor	0:dcf3c92487ca	420	/* packet not for us, route or discard */
idinor	0:dcf3c92487ca	421	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE, ("ip_input: packet not for us.\n"));
idinor	0:dcf3c92487ca	422	#if IP_FORWARD
idinor	0:dcf3c92487ca	423	/* non-broadcast packet? */
idinor	0:dcf3c92487ca	424	if (!ip_addr_isbroadcast(&current_iphdr_dest, inp)) {
idinor	0:dcf3c92487ca	425	/* try to forward IP packet on (other) interfaces */
idinor	0:dcf3c92487ca	426	ip_forward(p, iphdr, inp);
idinor	0:dcf3c92487ca	427	} else
idinor	0:dcf3c92487ca	428	#endif /* IP_FORWARD */
idinor	0:dcf3c92487ca	429	{
idinor	0:dcf3c92487ca	430	snmp_inc_ipinaddrerrors();
idinor	0:dcf3c92487ca	431	snmp_inc_ipindiscards();
idinor	0:dcf3c92487ca	432	}
idinor	0:dcf3c92487ca	433	pbuf_free(p);
idinor	0:dcf3c92487ca	434	return ERR_OK;
idinor	0:dcf3c92487ca	435	}
idinor	0:dcf3c92487ca	436	/* packet consists of multiple fragments? */
idinor	0:dcf3c92487ca	437	if ((IPH_OFFSET(iphdr) & PP_HTONS(IP_OFFMASK \| IP_MF)) != 0) {
idinor	0:dcf3c92487ca	438	#if IP_REASSEMBLY /* packet fragment reassembly code present? */
idinor	0:dcf3c92487ca	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",
idinor	0:dcf3c92487ca	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));
idinor	0:dcf3c92487ca	441	/* reassemble the packet*/
idinor	0:dcf3c92487ca	442	p = ip_reass(p);
idinor	0:dcf3c92487ca	443	/* packet not fully reassembled yet? */
idinor	0:dcf3c92487ca	444	if (p == NULL) {
idinor	0:dcf3c92487ca	445	return ERR_OK;
idinor	0:dcf3c92487ca	446	}
idinor	0:dcf3c92487ca	447	iphdr = (struct ip_hdr *)p->payload;
idinor	0:dcf3c92487ca	448	#else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
idinor	0:dcf3c92487ca	449	pbuf_free(p);
idinor	0:dcf3c92487ca	450	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
idinor	0:dcf3c92487ca	451	ntohs(IPH_OFFSET(iphdr))));
idinor	0:dcf3c92487ca	452	IP_STATS_INC(ip.opterr);
idinor	0:dcf3c92487ca	453	IP_STATS_INC(ip.drop);
idinor	0:dcf3c92487ca	454	/* unsupported protocol feature */
idinor	0:dcf3c92487ca	455	snmp_inc_ipinunknownprotos();
idinor	0:dcf3c92487ca	456	return ERR_OK;
idinor	0:dcf3c92487ca	457	#endif /* IP_REASSEMBLY */
idinor	0:dcf3c92487ca	458	}
idinor	0:dcf3c92487ca	459
idinor	0:dcf3c92487ca	460	#if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
idinor	0:dcf3c92487ca	461
idinor	0:dcf3c92487ca	462	#if LWIP_IGMP
idinor	0:dcf3c92487ca	463	/* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
idinor	0:dcf3c92487ca	464	if((iphdr_hlen > IP_HLEN) && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
idinor	0:dcf3c92487ca	465	#else
idinor	0:dcf3c92487ca	466	if (iphdr_hlen > IP_HLEN) {
idinor	0:dcf3c92487ca	467	#endif /* LWIP_IGMP */
idinor	0:dcf3c92487ca	468	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
idinor	0:dcf3c92487ca	469	pbuf_free(p);
idinor	0:dcf3c92487ca	470	IP_STATS_INC(ip.opterr);
idinor	0:dcf3c92487ca	471	IP_STATS_INC(ip.drop);
idinor	0:dcf3c92487ca	472	/* unsupported protocol feature */
idinor	0:dcf3c92487ca	473	snmp_inc_ipinunknownprotos();
idinor	0:dcf3c92487ca	474	return ERR_OK;
idinor	0:dcf3c92487ca	475	}
idinor	0:dcf3c92487ca	476	#endif /* IP_OPTIONS_ALLOWED == 0 */
idinor	0:dcf3c92487ca	477
idinor	0:dcf3c92487ca	478	/* send to upper layers */
idinor	0:dcf3c92487ca	479	LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
idinor	0:dcf3c92487ca	480	ip_debug_print(p);
idinor	0:dcf3c92487ca	481	LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
idinor	0:dcf3c92487ca	482
idinor	0:dcf3c92487ca	483	current_netif = inp;
idinor	0:dcf3c92487ca	484	current_header = iphdr;
idinor	0:dcf3c92487ca	485
idinor	0:dcf3c92487ca	486	#if LWIP_RAW
idinor	0:dcf3c92487ca	487	/* raw input did not eat the packet? */
idinor	0:dcf3c92487ca	488	if (raw_input(p, inp) == 0)
idinor	0:dcf3c92487ca	489	#endif /* LWIP_RAW */
idinor	0:dcf3c92487ca	490	{
idinor	0:dcf3c92487ca	491
idinor	0:dcf3c92487ca	492	switch (IPH_PROTO(iphdr)) {
idinor	0:dcf3c92487ca	493	#if LWIP_UDP
idinor	0:dcf3c92487ca	494	case IP_PROTO_UDP:
idinor	0:dcf3c92487ca	495	#if LWIP_UDPLITE
idinor	0:dcf3c92487ca	496	case IP_PROTO_UDPLITE:
idinor	0:dcf3c92487ca	497	#endif /* LWIP_UDPLITE */
idinor	0:dcf3c92487ca	498	snmp_inc_ipindelivers();
idinor	0:dcf3c92487ca	499	udp_input(p, inp);
idinor	0:dcf3c92487ca	500	break;
idinor	0:dcf3c92487ca	501	#endif /* LWIP_UDP */
idinor	0:dcf3c92487ca	502	#if LWIP_TCP
idinor	0:dcf3c92487ca	503	case IP_PROTO_TCP:
idinor	0:dcf3c92487ca	504	snmp_inc_ipindelivers();
idinor	0:dcf3c92487ca	505	tcp_input(p, inp);
idinor	0:dcf3c92487ca	506	break;
idinor	0:dcf3c92487ca	507	#endif /* LWIP_TCP */
idinor	0:dcf3c92487ca	508	#if LWIP_ICMP
idinor	0:dcf3c92487ca	509	case IP_PROTO_ICMP:
idinor	0:dcf3c92487ca	510	snmp_inc_ipindelivers();
idinor	0:dcf3c92487ca	511	icmp_input(p, inp);
idinor	0:dcf3c92487ca	512	break;
idinor	0:dcf3c92487ca	513	#endif /* LWIP_ICMP */
idinor	0:dcf3c92487ca	514	#if LWIP_IGMP
idinor	0:dcf3c92487ca	515	case IP_PROTO_IGMP:
idinor	0:dcf3c92487ca	516	igmp_input(p, inp, &current_iphdr_dest);
idinor	0:dcf3c92487ca	517	break;
idinor	0:dcf3c92487ca	518	#endif /* LWIP_IGMP */
idinor	0:dcf3c92487ca	519	default:
idinor	0:dcf3c92487ca	520	#if LWIP_ICMP
idinor	0:dcf3c92487ca	521	/* send ICMP destination protocol unreachable unless is was a broadcast */
idinor	0:dcf3c92487ca	522	if (!ip_addr_isbroadcast(&current_iphdr_dest, inp) &&
idinor	0:dcf3c92487ca	523	!ip_addr_ismulticast(&current_iphdr_dest)) {
idinor	0:dcf3c92487ca	524	p->payload = iphdr;
idinor	0:dcf3c92487ca	525	icmp_dest_unreach(p, ICMP_DUR_PROTO);
idinor	0:dcf3c92487ca	526	}
idinor	0:dcf3c92487ca	527	#endif /* LWIP_ICMP */
idinor	0:dcf3c92487ca	528	pbuf_free(p);
idinor	0:dcf3c92487ca	529
idinor	0:dcf3c92487ca	530	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
idinor	0:dcf3c92487ca	531
idinor	0:dcf3c92487ca	532	IP_STATS_INC(ip.proterr);
idinor	0:dcf3c92487ca	533	IP_STATS_INC(ip.drop);
idinor	0:dcf3c92487ca	534	snmp_inc_ipinunknownprotos();
idinor	0:dcf3c92487ca	535	}
idinor	0:dcf3c92487ca	536	}
idinor	0:dcf3c92487ca	537
idinor	0:dcf3c92487ca	538	current_netif = NULL;
idinor	0:dcf3c92487ca	539	current_header = NULL;
idinor	0:dcf3c92487ca	540	ip_addr_set_any(&current_iphdr_src);
idinor	0:dcf3c92487ca	541	ip_addr_set_any(&current_iphdr_dest);
idinor	0:dcf3c92487ca	542
idinor	0:dcf3c92487ca	543	return ERR_OK;
idinor	0:dcf3c92487ca	544	}
idinor	0:dcf3c92487ca	545
idinor	0:dcf3c92487ca	546	/**
idinor	0:dcf3c92487ca	547	* Sends an IP packet on a network interface. This function constructs
idinor	0:dcf3c92487ca	548	* the IP header and calculates the IP header checksum. If the source
idinor	0:dcf3c92487ca	549	* IP address is NULL, the IP address of the outgoing network
idinor	0:dcf3c92487ca	550	* interface is filled in as source address.
idinor	0:dcf3c92487ca	551	* If the destination IP address is IP_HDRINCL, p is assumed to already
idinor	0:dcf3c92487ca	552	* include an IP header and p->payload points to it instead of the data.
idinor	0:dcf3c92487ca	553	*
idinor	0:dcf3c92487ca	554	* @param p the packet to send (p->payload points to the data, e.g. next
idinor	0:dcf3c92487ca	555	protocol header; if dest == IP_HDRINCL, p already includes an IP
idinor	0:dcf3c92487ca	556	header and p->payload points to that IP header)
idinor	0:dcf3c92487ca	557	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
idinor	0:dcf3c92487ca	558	* IP address of the netif used to send is used as source address)
idinor	0:dcf3c92487ca	559	* @param dest the destination IP address to send the packet to
idinor	0:dcf3c92487ca	560	* @param ttl the TTL value to be set in the IP header
idinor	0:dcf3c92487ca	561	* @param tos the TOS value to be set in the IP header
idinor	0:dcf3c92487ca	562	* @param proto the PROTOCOL to be set in the IP header
idinor	0:dcf3c92487ca	563	* @param netif the netif on which to send this packet
idinor	0:dcf3c92487ca	564	* @return ERR_OK if the packet was sent OK
idinor	0:dcf3c92487ca	565	* ERR_BUF if p doesn't have enough space for IP/LINK headers
idinor	0:dcf3c92487ca	566	* returns errors returned by netif->output
idinor	0:dcf3c92487ca	567	*
idinor	0:dcf3c92487ca	568	* @note ip_id: RFC791 "some host may be able to simply use
idinor	0:dcf3c92487ca	569	* unique identifiers independent of destination"
idinor	0:dcf3c92487ca	570	*/
idinor	0:dcf3c92487ca	571	err_t
idinor	0:dcf3c92487ca	572	ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
idinor	0:dcf3c92487ca	573	u8_t ttl, u8_t tos,
idinor	0:dcf3c92487ca	574	u8_t proto, struct netif *netif)
idinor	0:dcf3c92487ca	575	{
idinor	0:dcf3c92487ca	576	#if IP_OPTIONS_SEND
idinor	0:dcf3c92487ca	577	return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
idinor	0:dcf3c92487ca	578	}
idinor	0:dcf3c92487ca	579
idinor	0:dcf3c92487ca	580	/**
idinor	0:dcf3c92487ca	581	* Same as ip_output_if() but with the possibility to include IP options:
idinor	0:dcf3c92487ca	582	*
idinor	0:dcf3c92487ca	583	* @ param ip_options pointer to the IP options, copied into the IP header
idinor	0:dcf3c92487ca	584	* @ param optlen length of ip_options
idinor	0:dcf3c92487ca	585	*/
idinor	0:dcf3c92487ca	586	err_t ip_output_if_opt(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
idinor	0:dcf3c92487ca	587	u8_t ttl, u8_t tos, u8_t proto, struct netif netif, void ip_options,
idinor	0:dcf3c92487ca	588	u16_t optlen)
idinor	0:dcf3c92487ca	589	{
idinor	0:dcf3c92487ca	590	#endif /* IP_OPTIONS_SEND */
idinor	0:dcf3c92487ca	591	struct ip_hdr *iphdr;
idinor	0:dcf3c92487ca	592	ip_addr_t dest_addr;
idinor	0:dcf3c92487ca	593	#if CHECKSUM_GEN_IP_INLINE
idinor	0:dcf3c92487ca	594	u32_t chk_sum = 0;
idinor	0:dcf3c92487ca	595	#endif /* CHECKSUM_GEN_IP_INLINE */
idinor	0:dcf3c92487ca	596
idinor	0:dcf3c92487ca	597	/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
idinor	0:dcf3c92487ca	598	gets altered as the packet is passed down the stack */
idinor	0:dcf3c92487ca	599	LWIP_ASSERT("p->ref == 1", p->ref == 1);
idinor	0:dcf3c92487ca	600
idinor	0:dcf3c92487ca	601	snmp_inc_ipoutrequests();
idinor	0:dcf3c92487ca	602
idinor	0:dcf3c92487ca	603	/* Should the IP header be generated or is it already included in p? */
idinor	0:dcf3c92487ca	604	if (dest != IP_HDRINCL) {
idinor	0:dcf3c92487ca	605	u16_t ip_hlen = IP_HLEN;
idinor	0:dcf3c92487ca	606	#if IP_OPTIONS_SEND
idinor	0:dcf3c92487ca	607	u16_t optlen_aligned = 0;
idinor	0:dcf3c92487ca	608	if (optlen != 0) {
idinor	0:dcf3c92487ca	609	#if CHECKSUM_GEN_IP_INLINE
idinor	0:dcf3c92487ca	610	int i;
idinor	0:dcf3c92487ca	611	#endif /* CHECKSUM_GEN_IP_INLINE */
idinor	0:dcf3c92487ca	612	/* round up to a multiple of 4 */
idinor	0:dcf3c92487ca	613	optlen_aligned = ((optlen + 3) & ~3);
idinor	0:dcf3c92487ca	614	ip_hlen += optlen_aligned;
idinor	0:dcf3c92487ca	615	/* First write in the IP options */
idinor	0:dcf3c92487ca	616	if (pbuf_header(p, optlen_aligned)) {
idinor	0:dcf3c92487ca	617	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
idinor	0:dcf3c92487ca	618	IP_STATS_INC(ip.err);
idinor	0:dcf3c92487ca	619	snmp_inc_ipoutdiscards();
idinor	0:dcf3c92487ca	620	return ERR_BUF;
idinor	0:dcf3c92487ca	621	}
idinor	0:dcf3c92487ca	622	MEMCPY(p->payload, ip_options, optlen);
idinor	0:dcf3c92487ca	623	if (optlen < optlen_aligned) {
idinor	0:dcf3c92487ca	624	/* zero the remaining bytes */
idinor	0:dcf3c92487ca	625	memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
idinor	0:dcf3c92487ca	626	}
idinor	0:dcf3c92487ca	627	#if CHECKSUM_GEN_IP_INLINE
idinor	0:dcf3c92487ca	628	for (i = 0; i < optlen_aligned; i += sizeof(u16_t)) {
idinor	0:dcf3c92487ca	629	chk_sum += ((u16_t*)p->payload)[i];
idinor	0:dcf3c92487ca	630	}
idinor	0:dcf3c92487ca	631	#endif /* CHECKSUM_GEN_IP_INLINE */
idinor	0:dcf3c92487ca	632	}
idinor	0:dcf3c92487ca	633	#endif /* IP_OPTIONS_SEND */
idinor	0:dcf3c92487ca	634	/* generate IP header */
idinor	0:dcf3c92487ca	635	if (pbuf_header(p, IP_HLEN)) {
idinor	0:dcf3c92487ca	636	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("ip_output: not enough room for IP header in pbuf\n"));
idinor	0:dcf3c92487ca	637
idinor	0:dcf3c92487ca	638	IP_STATS_INC(ip.err);
idinor	0:dcf3c92487ca	639	snmp_inc_ipoutdiscards();
idinor	0:dcf3c92487ca	640	return ERR_BUF;
idinor	0:dcf3c92487ca	641	}
idinor	0:dcf3c92487ca	642
idinor	0:dcf3c92487ca	643	iphdr = (struct ip_hdr *)p->payload;
idinor	0:dcf3c92487ca	644	LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
idinor	0:dcf3c92487ca	645	(p->len >= sizeof(struct ip_hdr)));
idinor	0:dcf3c92487ca	646
idinor	0:dcf3c92487ca	647	IPH_TTL_SET(iphdr, ttl);
idinor	0:dcf3c92487ca	648	IPH_PROTO_SET(iphdr, proto);
idinor	0:dcf3c92487ca	649	#if CHECKSUM_GEN_IP_INLINE
idinor	0:dcf3c92487ca	650	chk_sum += LWIP_MAKE_U16(proto, ttl);
idinor	0:dcf3c92487ca	651	#endif /* CHECKSUM_GEN_IP_INLINE */
idinor	0:dcf3c92487ca	652
idinor	0:dcf3c92487ca	653	/* dest cannot be NULL here */
idinor	0:dcf3c92487ca	654	ip_addr_copy(iphdr->dest, *dest);
idinor	0:dcf3c92487ca	655	#if CHECKSUM_GEN_IP_INLINE
idinor	0:dcf3c92487ca	656	chk_sum += ip4_addr_get_u32(&iphdr->dest) & 0xFFFF;
idinor	0:dcf3c92487ca	657	chk_sum += ip4_addr_get_u32(&iphdr->dest) >> 16;
idinor	0:dcf3c92487ca	658	#endif /* CHECKSUM_GEN_IP_INLINE */
idinor	0:dcf3c92487ca	659
idinor	0:dcf3c92487ca	660	IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
idinor	0:dcf3c92487ca	661	#if CHECKSUM_GEN_IP_INLINE
idinor	0:dcf3c92487ca	662	chk_sum += iphdr->_v_hl_tos;
idinor	0:dcf3c92487ca	663	#endif /* CHECKSUM_GEN_IP_INLINE */
idinor	0:dcf3c92487ca	664	IPH_LEN_SET(iphdr, htons(p->tot_len));
idinor	0:dcf3c92487ca	665	#if CHECKSUM_GEN_IP_INLINE
idinor	0:dcf3c92487ca	666	chk_sum += iphdr->_len;
idinor	0:dcf3c92487ca	667	#endif /* CHECKSUM_GEN_IP_INLINE */
idinor	0:dcf3c92487ca	668	IPH_OFFSET_SET(iphdr, 0);
idinor	0:dcf3c92487ca	669	IPH_ID_SET(iphdr, htons(ip_id));
idinor	0:dcf3c92487ca	670	#if CHECKSUM_GEN_IP_INLINE
idinor	0:dcf3c92487ca	671	chk_sum += iphdr->_id;
idinor	0:dcf3c92487ca	672	#endif /* CHECKSUM_GEN_IP_INLINE */
idinor	0:dcf3c92487ca	673	++ip_id;
idinor	0:dcf3c92487ca	674
idinor	0:dcf3c92487ca	675	if (ip_addr_isany(src)) {
idinor	0:dcf3c92487ca	676	ip_addr_copy(iphdr->src, netif->ip_addr);
idinor	0:dcf3c92487ca	677	} else {
idinor	0:dcf3c92487ca	678	/* src cannot be NULL here */
idinor	0:dcf3c92487ca	679	ip_addr_copy(iphdr->src, *src);
idinor	0:dcf3c92487ca	680	}
idinor	0:dcf3c92487ca	681
idinor	0:dcf3c92487ca	682	#if CHECKSUM_GEN_IP_INLINE
idinor	0:dcf3c92487ca	683	chk_sum += ip4_addr_get_u32(&iphdr->src) & 0xFFFF;
idinor	0:dcf3c92487ca	684	chk_sum += ip4_addr_get_u32(&iphdr->src) >> 16;
idinor	0:dcf3c92487ca	685	chk_sum = (chk_sum >> 16) + (chk_sum & 0xFFFF);
idinor	0:dcf3c92487ca	686	chk_sum = (chk_sum >> 16) + chk_sum;
idinor	0:dcf3c92487ca	687	chk_sum = ~chk_sum;
idinor	0:dcf3c92487ca	688	iphdr->_chksum = chk_sum; /* network order */
idinor	0:dcf3c92487ca	689	#else /* CHECKSUM_GEN_IP_INLINE */
idinor	0:dcf3c92487ca	690	IPH_CHKSUM_SET(iphdr, 0);
idinor	0:dcf3c92487ca	691	#if CHECKSUM_GEN_IP
idinor	0:dcf3c92487ca	692	IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
idinor	0:dcf3c92487ca	693	#endif
idinor	0:dcf3c92487ca	694	#endif /* CHECKSUM_GEN_IP_INLINE */
idinor	0:dcf3c92487ca	695	} else {
idinor	0:dcf3c92487ca	696	/* IP header already included in p */
idinor	0:dcf3c92487ca	697	iphdr = (struct ip_hdr *)p->payload;
idinor	0:dcf3c92487ca	698	ip_addr_copy(dest_addr, iphdr->dest);
idinor	0:dcf3c92487ca	699	dest = &dest_addr;
idinor	0:dcf3c92487ca	700	}
idinor	0:dcf3c92487ca	701
idinor	0:dcf3c92487ca	702	IP_STATS_INC(ip.xmit);
idinor	0:dcf3c92487ca	703
idinor	0:dcf3c92487ca	704	LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
idinor	0:dcf3c92487ca	705	ip_debug_print(p);
idinor	0:dcf3c92487ca	706
idinor	0:dcf3c92487ca	707	#if ENABLE_LOOPBACK
idinor	0:dcf3c92487ca	708	if (ip_addr_cmp(dest, &netif->ip_addr)) {
idinor	0:dcf3c92487ca	709	/* Packet to self, enqueue it for loopback */
idinor	0:dcf3c92487ca	710	LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
idinor	0:dcf3c92487ca	711	return netif_loop_output(netif, p, dest);
idinor	0:dcf3c92487ca	712	}
idinor	0:dcf3c92487ca	713	#if LWIP_IGMP
idinor	0:dcf3c92487ca	714	if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) {
idinor	0:dcf3c92487ca	715	netif_loop_output(netif, p, dest);
idinor	0:dcf3c92487ca	716	}
idinor	0:dcf3c92487ca	717	#endif /* LWIP_IGMP */
idinor	0:dcf3c92487ca	718	#endif /* ENABLE_LOOPBACK */
idinor	0:dcf3c92487ca	719	#if IP_FRAG
idinor	0:dcf3c92487ca	720	/* don't fragment if interface has mtu set to 0 [loopif] */
idinor	0:dcf3c92487ca	721	if (netif->mtu && (p->tot_len > netif->mtu)) {
idinor	0:dcf3c92487ca	722	return ip_frag(p, netif, dest);
idinor	0:dcf3c92487ca	723	}
idinor	0:dcf3c92487ca	724	#endif /* IP_FRAG */
idinor	0:dcf3c92487ca	725
idinor	0:dcf3c92487ca	726	LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
idinor	0:dcf3c92487ca	727	return netif->output(netif, p, dest);
idinor	0:dcf3c92487ca	728	}
idinor	0:dcf3c92487ca	729
idinor	0:dcf3c92487ca	730	/**
idinor	0:dcf3c92487ca	731	* Simple interface to ip_output_if. It finds the outgoing network
idinor	0:dcf3c92487ca	732	* interface and calls upon ip_output_if to do the actual work.
idinor	0:dcf3c92487ca	733	*
idinor	0:dcf3c92487ca	734	* @param p the packet to send (p->payload points to the data, e.g. next
idinor	0:dcf3c92487ca	735	protocol header; if dest == IP_HDRINCL, p already includes an IP
idinor	0:dcf3c92487ca	736	header and p->payload points to that IP header)
idinor	0:dcf3c92487ca	737	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
idinor	0:dcf3c92487ca	738	* IP address of the netif used to send is used as source address)
idinor	0:dcf3c92487ca	739	* @param dest the destination IP address to send the packet to
idinor	0:dcf3c92487ca	740	* @param ttl the TTL value to be set in the IP header
idinor	0:dcf3c92487ca	741	* @param tos the TOS value to be set in the IP header
idinor	0:dcf3c92487ca	742	* @param proto the PROTOCOL to be set in the IP header
idinor	0:dcf3c92487ca	743	*
idinor	0:dcf3c92487ca	744	* @return ERR_RTE if no route is found
idinor	0:dcf3c92487ca	745	* see ip_output_if() for more return values
idinor	0:dcf3c92487ca	746	*/
idinor	0:dcf3c92487ca	747	err_t
idinor	0:dcf3c92487ca	748	ip_output(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
idinor	0:dcf3c92487ca	749	u8_t ttl, u8_t tos, u8_t proto)
idinor	0:dcf3c92487ca	750	{
idinor	0:dcf3c92487ca	751	struct netif *netif;
idinor	0:dcf3c92487ca	752
idinor	0:dcf3c92487ca	753	/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
idinor	0:dcf3c92487ca	754	gets altered as the packet is passed down the stack */
idinor	0:dcf3c92487ca	755	LWIP_ASSERT("p->ref == 1", p->ref == 1);
idinor	0:dcf3c92487ca	756
idinor	0:dcf3c92487ca	757	if ((netif = ip_route(dest)) == NULL) {
idinor	0:dcf3c92487ca	758	LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
idinor	0:dcf3c92487ca	759	ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
idinor	0:dcf3c92487ca	760	IP_STATS_INC(ip.rterr);
idinor	0:dcf3c92487ca	761	return ERR_RTE;
idinor	0:dcf3c92487ca	762	}
idinor	0:dcf3c92487ca	763
idinor	0:dcf3c92487ca	764	return ip_output_if(p, src, dest, ttl, tos, proto, netif);
idinor	0:dcf3c92487ca	765	}
idinor	0:dcf3c92487ca	766
idinor	0:dcf3c92487ca	767	#if LWIP_NETIF_HWADDRHINT
idinor	0:dcf3c92487ca	768	/** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
idinor	0:dcf3c92487ca	769	* before calling ip_output_if.
idinor	0:dcf3c92487ca	770	*
idinor	0:dcf3c92487ca	771	* @param p the packet to send (p->payload points to the data, e.g. next
idinor	0:dcf3c92487ca	772	protocol header; if dest == IP_HDRINCL, p already includes an IP
idinor	0:dcf3c92487ca	773	header and p->payload points to that IP header)
idinor	0:dcf3c92487ca	774	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
idinor	0:dcf3c92487ca	775	* IP address of the netif used to send is used as source address)
idinor	0:dcf3c92487ca	776	* @param dest the destination IP address to send the packet to
idinor	0:dcf3c92487ca	777	* @param ttl the TTL value to be set in the IP header
idinor	0:dcf3c92487ca	778	* @param tos the TOS value to be set in the IP header
idinor	0:dcf3c92487ca	779	* @param proto the PROTOCOL to be set in the IP header
idinor	0:dcf3c92487ca	780	* @param addr_hint address hint pointer set to netif->addr_hint before
idinor	0:dcf3c92487ca	781	* calling ip_output_if()
idinor	0:dcf3c92487ca	782	*
idinor	0:dcf3c92487ca	783	* @return ERR_RTE if no route is found
idinor	0:dcf3c92487ca	784	* see ip_output_if() for more return values
idinor	0:dcf3c92487ca	785	*/
idinor	0:dcf3c92487ca	786	err_t
idinor	0:dcf3c92487ca	787	ip_output_hinted(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
idinor	0:dcf3c92487ca	788	u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
idinor	0:dcf3c92487ca	789	{
idinor	0:dcf3c92487ca	790	struct netif *netif;
idinor	0:dcf3c92487ca	791	err_t err;
idinor	0:dcf3c92487ca	792
idinor	0:dcf3c92487ca	793	/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
idinor	0:dcf3c92487ca	794	gets altered as the packet is passed down the stack */
idinor	0:dcf3c92487ca	795	LWIP_ASSERT("p->ref == 1", p->ref == 1);
idinor	0:dcf3c92487ca	796
idinor	0:dcf3c92487ca	797	if ((netif = ip_route(dest)) == NULL) {
idinor	0:dcf3c92487ca	798	LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
idinor	0:dcf3c92487ca	799	ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
idinor	0:dcf3c92487ca	800	IP_STATS_INC(ip.rterr);
idinor	0:dcf3c92487ca	801	return ERR_RTE;
idinor	0:dcf3c92487ca	802	}
idinor	0:dcf3c92487ca	803
idinor	0:dcf3c92487ca	804	netif->addr_hint = addr_hint;
idinor	0:dcf3c92487ca	805	err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
idinor	0:dcf3c92487ca	806	netif->addr_hint = NULL;
idinor	0:dcf3c92487ca	807
idinor	0:dcf3c92487ca	808	return err;
idinor	0:dcf3c92487ca	809	}
idinor	0:dcf3c92487ca	810	#endif /* LWIP_NETIF_HWADDRHINT*/
idinor	0:dcf3c92487ca	811
idinor	0:dcf3c92487ca	812	#if IP_DEBUG
idinor	0:dcf3c92487ca	813	/* Print an IP header by using LWIP_DEBUGF
idinor	0:dcf3c92487ca	814	* @param p an IP packet, p->payload pointing to the IP header
idinor	0:dcf3c92487ca	815	*/
idinor	0:dcf3c92487ca	816	void
idinor	0:dcf3c92487ca	817	ip_debug_print(struct pbuf *p)
idinor	0:dcf3c92487ca	818	{
idinor	0:dcf3c92487ca	819	struct ip_hdr iphdr = (struct ip_hdr )p->payload;
idinor	0:dcf3c92487ca	820	u8_t *payload;
idinor	0:dcf3c92487ca	821
idinor	0:dcf3c92487ca	822	payload = (u8_t *)iphdr + IP_HLEN;
idinor	0:dcf3c92487ca	823
idinor	0:dcf3c92487ca	824	LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
idinor	0:dcf3c92487ca	825	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	826	LWIP_DEBUGF(IP_DEBUG, ("\|%2"S16_F" \|%2"S16_F" \| 0x%02"X16_F" \| %5"U16_F" \| (v, hl, tos, len)\n",
idinor	0:dcf3c92487ca	827	IPH_V(iphdr),
idinor	0:dcf3c92487ca	828	IPH_HL(iphdr),
idinor	0:dcf3c92487ca	829	IPH_TOS(iphdr),
idinor	0:dcf3c92487ca	830	ntohs(IPH_LEN(iphdr))));
idinor	0:dcf3c92487ca	831	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	832	LWIP_DEBUGF(IP_DEBUG, ("\| %5"U16_F" \|%"U16_F"%"U16_F"%"U16_F"\| %4"U16_F" \| (id, flags, offset)\n",
idinor	0:dcf3c92487ca	833	ntohs(IPH_ID(iphdr)),
idinor	0:dcf3c92487ca	834	ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
idinor	0:dcf3c92487ca	835	ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
idinor	0:dcf3c92487ca	836	ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
idinor	0:dcf3c92487ca	837	ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
idinor	0:dcf3c92487ca	838	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	839	LWIP_DEBUGF(IP_DEBUG, ("\| %3"U16_F" \| %3"U16_F" \| 0x%04"X16_F" \| (ttl, proto, chksum)\n",
idinor	0:dcf3c92487ca	840	IPH_TTL(iphdr),
idinor	0:dcf3c92487ca	841	IPH_PROTO(iphdr),
idinor	0:dcf3c92487ca	842	ntohs(IPH_CHKSUM(iphdr))));
idinor	0:dcf3c92487ca	843	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	844	LWIP_DEBUGF(IP_DEBUG, ("\| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| (src)\n",
idinor	0:dcf3c92487ca	845	ip4_addr1_16(&iphdr->src),
idinor	0:dcf3c92487ca	846	ip4_addr2_16(&iphdr->src),
idinor	0:dcf3c92487ca	847	ip4_addr3_16(&iphdr->src),
idinor	0:dcf3c92487ca	848	ip4_addr4_16(&iphdr->src)));
idinor	0:dcf3c92487ca	849	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	850	LWIP_DEBUGF(IP_DEBUG, ("\| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| (dest)\n",
idinor	0:dcf3c92487ca	851	ip4_addr1_16(&iphdr->dest),
idinor	0:dcf3c92487ca	852	ip4_addr2_16(&iphdr->dest),
idinor	0:dcf3c92487ca	853	ip4_addr3_16(&iphdr->dest),
idinor	0:dcf3c92487ca	854	ip4_addr4_16(&iphdr->dest)));
idinor	0:dcf3c92487ca	855	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	856	}
idinor	0:dcf3c92487ca	857	#endif /* IP_DEBUG */

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Type:	Library
Created:	20 Jul 2011
Imports:	35
Forks:	0
Commits:	1
Dependents:	1
Dependencies:	0
Followers:	1

lwip/core/ipv4/ip.c@0:dcf3c92487ca, 2011-07-20 (annotated)

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