NetServicesMinHTTPMod - Copy of NetServicesMin with the HTTP Client libra…

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Copy of NetServicesMin with the HTTP Client library. Includes modification for HTTP servers which send the HTTP status line in its own packet.

lwip/core/ipv4/ip.c@0:18dd877d2c77, 2011-05-26 (annotated)

Committer:: andrewbonney
Date:: Thu May 26 10:02:40 2011 +0000
Revision:: 0:18dd877d2c77

Who changed what in which revision?

User	Revision	Line number	New contents of line
andrewbonney	0:18dd877d2c77	1	/**
andrewbonney	0:18dd877d2c77	2	* @file
andrewbonney	0:18dd877d2c77	3	* This is the IPv4 layer implementation for incoming and outgoing IP traffic.
andrewbonney	0:18dd877d2c77	4	*
andrewbonney	0:18dd877d2c77	5	* @see ip_frag.c
andrewbonney	0:18dd877d2c77	6	*
andrewbonney	0:18dd877d2c77	7	*/
andrewbonney	0:18dd877d2c77	8
andrewbonney	0:18dd877d2c77	9	/*
andrewbonney	0:18dd877d2c77	10	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
andrewbonney	0:18dd877d2c77	11	* All rights reserved.
andrewbonney	0:18dd877d2c77	12	*
andrewbonney	0:18dd877d2c77	13	* Redistribution and use in source and binary forms, with or without modification,
andrewbonney	0:18dd877d2c77	14	* are permitted provided that the following conditions are met:
andrewbonney	0:18dd877d2c77	15	*
andrewbonney	0:18dd877d2c77	16	* 1. Redistributions of source code must retain the above copyright notice,
andrewbonney	0:18dd877d2c77	17	* this list of conditions and the following disclaimer.
andrewbonney	0:18dd877d2c77	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
andrewbonney	0:18dd877d2c77	19	* this list of conditions and the following disclaimer in the documentation
andrewbonney	0:18dd877d2c77	20	* and/or other materials provided with the distribution.
andrewbonney	0:18dd877d2c77	21	* 3. The name of the author may not be used to endorse or promote products
andrewbonney	0:18dd877d2c77	22	* derived from this software without specific prior written permission.
andrewbonney	0:18dd877d2c77	23	*
andrewbonney	0:18dd877d2c77	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
andrewbonney	0:18dd877d2c77	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
andrewbonney	0:18dd877d2c77	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
andrewbonney	0:18dd877d2c77	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
andrewbonney	0:18dd877d2c77	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
andrewbonney	0:18dd877d2c77	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
andrewbonney	0:18dd877d2c77	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
andrewbonney	0:18dd877d2c77	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
andrewbonney	0:18dd877d2c77	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
andrewbonney	0:18dd877d2c77	33	* OF SUCH DAMAGE.
andrewbonney	0:18dd877d2c77	34	*
andrewbonney	0:18dd877d2c77	35	* This file is part of the lwIP TCP/IP stack.
andrewbonney	0:18dd877d2c77	36	*
andrewbonney	0:18dd877d2c77	37	* Author: Adam Dunkels <adam@sics.se>
andrewbonney	0:18dd877d2c77	38	*
andrewbonney	0:18dd877d2c77	39	*/
andrewbonney	0:18dd877d2c77	40
andrewbonney	0:18dd877d2c77	41	#include "lwip/opt.h"
andrewbonney	0:18dd877d2c77	42	#include "lwip/ip.h"
andrewbonney	0:18dd877d2c77	43	#include "lwip/def.h"
andrewbonney	0:18dd877d2c77	44	#include "lwip/mem.h"
andrewbonney	0:18dd877d2c77	45	#include "lwip/ip_frag.h"
andrewbonney	0:18dd877d2c77	46	#include "lwip/inet_chksum.h"
andrewbonney	0:18dd877d2c77	47	#include "lwip/netif.h"
andrewbonney	0:18dd877d2c77	48	#include "lwip/icmp.h"
andrewbonney	0:18dd877d2c77	49	#include "lwip/igmp.h"
andrewbonney	0:18dd877d2c77	50	#include "lwip/raw.h"
andrewbonney	0:18dd877d2c77	51	#include "lwip/udp.h"
andrewbonney	0:18dd877d2c77	52	#include "lwip/tcp_impl.h"
andrewbonney	0:18dd877d2c77	53	#include "lwip/snmp.h"
andrewbonney	0:18dd877d2c77	54	#include "lwip/dhcp.h"
andrewbonney	0:18dd877d2c77	55	#include "lwip/autoip.h"
andrewbonney	0:18dd877d2c77	56	#include "lwip/stats.h"
andrewbonney	0:18dd877d2c77	57	#include "arch/perf.h"
andrewbonney	0:18dd877d2c77	58
andrewbonney	0:18dd877d2c77	59	#include <string.h>
andrewbonney	0:18dd877d2c77	60
andrewbonney	0:18dd877d2c77	61	/** Set this to 0 in the rare case of wanting to call an extra function to
andrewbonney	0:18dd877d2c77	62	* generate the IP checksum (in contrast to calculating it on-the-fly). */
andrewbonney	0:18dd877d2c77	63	#ifndef LWIP_INLINE_IP_CHKSUM
andrewbonney	0:18dd877d2c77	64	#define LWIP_INLINE_IP_CHKSUM 1
andrewbonney	0:18dd877d2c77	65	#endif
andrewbonney	0:18dd877d2c77	66	#if LWIP_INLINE_IP_CHKSUM && CHECKSUM_GEN_IP
andrewbonney	0:18dd877d2c77	67	#define CHECKSUM_GEN_IP_INLINE 1
andrewbonney	0:18dd877d2c77	68	#else
andrewbonney	0:18dd877d2c77	69	#define CHECKSUM_GEN_IP_INLINE 0
andrewbonney	0:18dd877d2c77	70	#endif
andrewbonney	0:18dd877d2c77	71
andrewbonney	0:18dd877d2c77	72	#if LWIP_DHCP \|\| defined(LWIP_IP_ACCEPT_UDP_PORT)
andrewbonney	0:18dd877d2c77	73	#define IP_ACCEPT_LINK_LAYER_ADDRESSING 1
andrewbonney	0:18dd877d2c77	74
andrewbonney	0:18dd877d2c77	75	/** Some defines for DHCP to let link-layer-addressed packets through while the
andrewbonney	0:18dd877d2c77	76	* netif is down.
andrewbonney	0:18dd877d2c77	77	* To use this in your own application/protocol, define LWIP_IP_ACCEPT_UDP_PORT
andrewbonney	0:18dd877d2c77	78	* to return 1 if the port is accepted and 0 if the port is not accepted.
andrewbonney	0:18dd877d2c77	79	*/
andrewbonney	0:18dd877d2c77	80	#if LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT)
andrewbonney	0:18dd877d2c77	81	/* accept DHCP client port and custom port */
andrewbonney	0:18dd877d2c77	82	#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (((port) == PP_NTOHS(DHCP_CLIENT_PORT)) \
andrewbonney	0:18dd877d2c77	83	\|\| (LWIP_IP_ACCEPT_UDP_PORT(port)))
andrewbonney	0:18dd877d2c77	84	#elif defined(LWIP_IP_ACCEPT_UDP_PORT) /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
andrewbonney	0:18dd877d2c77	85	/* accept custom port only */
andrewbonney	0:18dd877d2c77	86	#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (LWIP_IP_ACCEPT_UDP_PORT(dst_port))
andrewbonney	0:18dd877d2c77	87	#else /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
andrewbonney	0:18dd877d2c77	88	/* accept DHCP client port only */
andrewbonney	0:18dd877d2c77	89	#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) ((port) == PP_NTOHS(DHCP_CLIENT_PORT))
andrewbonney	0:18dd877d2c77	90	#endif /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
andrewbonney	0:18dd877d2c77	91
andrewbonney	0:18dd877d2c77	92	#else /* LWIP_DHCP */
andrewbonney	0:18dd877d2c77	93	#define IP_ACCEPT_LINK_LAYER_ADDRESSING 0
andrewbonney	0:18dd877d2c77	94	#endif /* LWIP_DHCP */
andrewbonney	0:18dd877d2c77	95
andrewbonney	0:18dd877d2c77	96	/**
andrewbonney	0:18dd877d2c77	97	* The interface that provided the packet for the current callback
andrewbonney	0:18dd877d2c77	98	* invocation.
andrewbonney	0:18dd877d2c77	99	*/
andrewbonney	0:18dd877d2c77	100	struct netif *current_netif;
andrewbonney	0:18dd877d2c77	101
andrewbonney	0:18dd877d2c77	102	/**
andrewbonney	0:18dd877d2c77	103	* Header of the input packet currently being processed.
andrewbonney	0:18dd877d2c77	104	*/
andrewbonney	0:18dd877d2c77	105	const struct ip_hdr *current_header;
andrewbonney	0:18dd877d2c77	106	/** Source IP address of current_header */
andrewbonney	0:18dd877d2c77	107	ip_addr_t current_iphdr_src;
andrewbonney	0:18dd877d2c77	108	/** Destination IP address of current_header */
andrewbonney	0:18dd877d2c77	109	ip_addr_t current_iphdr_dest;
andrewbonney	0:18dd877d2c77	110
andrewbonney	0:18dd877d2c77	111	/** The IP header ID of the next outgoing IP packet */
andrewbonney	0:18dd877d2c77	112	static u16_t ip_id;
andrewbonney	0:18dd877d2c77	113
andrewbonney	0:18dd877d2c77	114	/**
andrewbonney	0:18dd877d2c77	115	* Finds the appropriate network interface for a given IP address. It
andrewbonney	0:18dd877d2c77	116	* searches the list of network interfaces linearly. A match is found
andrewbonney	0:18dd877d2c77	117	* if the masked IP address of the network interface equals the masked
andrewbonney	0:18dd877d2c77	118	* IP address given to the function.
andrewbonney	0:18dd877d2c77	119	*
andrewbonney	0:18dd877d2c77	120	* @param dest the destination IP address for which to find the route
andrewbonney	0:18dd877d2c77	121	* @return the netif on which to send to reach dest
andrewbonney	0:18dd877d2c77	122	*/
andrewbonney	0:18dd877d2c77	123	struct netif *
andrewbonney	0:18dd877d2c77	124	ip_route(ip_addr_t *dest)
andrewbonney	0:18dd877d2c77	125	{
andrewbonney	0:18dd877d2c77	126	struct netif *netif;
andrewbonney	0:18dd877d2c77	127
andrewbonney	0:18dd877d2c77	128	/* iterate through netifs */
andrewbonney	0:18dd877d2c77	129	for(netif = netif_list; netif != NULL; netif = netif->next) {
andrewbonney	0:18dd877d2c77	130	/* network mask matches? */
andrewbonney	0:18dd877d2c77	131	if (netif_is_up(netif)) {
andrewbonney	0:18dd877d2c77	132	if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
andrewbonney	0:18dd877d2c77	133	/* return netif on which to forward IP packet */
andrewbonney	0:18dd877d2c77	134	return netif;
andrewbonney	0:18dd877d2c77	135	}
andrewbonney	0:18dd877d2c77	136	}
andrewbonney	0:18dd877d2c77	137	}
andrewbonney	0:18dd877d2c77	138	if ((netif_default == NULL) \|\| (!netif_is_up(netif_default))) {
andrewbonney	0:18dd877d2c77	139	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("ip_route: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
andrewbonney	0:18dd877d2c77	140	ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
andrewbonney	0:18dd877d2c77	141	IP_STATS_INC(ip.rterr);
andrewbonney	0:18dd877d2c77	142	snmp_inc_ipoutnoroutes();
andrewbonney	0:18dd877d2c77	143	return NULL;
andrewbonney	0:18dd877d2c77	144	}
andrewbonney	0:18dd877d2c77	145	/* no matching netif found, use default netif */
andrewbonney	0:18dd877d2c77	146	return netif_default;
andrewbonney	0:18dd877d2c77	147	}
andrewbonney	0:18dd877d2c77	148
andrewbonney	0:18dd877d2c77	149	#if IP_FORWARD
andrewbonney	0:18dd877d2c77	150	/**
andrewbonney	0:18dd877d2c77	151	* Forwards an IP packet. It finds an appropriate route for the
andrewbonney	0:18dd877d2c77	152	* packet, decrements the TTL value of the packet, adjusts the
andrewbonney	0:18dd877d2c77	153	* checksum and outputs the packet on the appropriate interface.
andrewbonney	0:18dd877d2c77	154	*
andrewbonney	0:18dd877d2c77	155	* @param p the packet to forward (p->payload points to IP header)
andrewbonney	0:18dd877d2c77	156	* @param iphdr the IP header of the input packet
andrewbonney	0:18dd877d2c77	157	* @param inp the netif on which this packet was received
andrewbonney	0:18dd877d2c77	158	*/
andrewbonney	0:18dd877d2c77	159	static void
andrewbonney	0:18dd877d2c77	160	ip_forward(struct pbuf p, struct ip_hdr iphdr, struct netif *inp)
andrewbonney	0:18dd877d2c77	161	{
andrewbonney	0:18dd877d2c77	162	struct netif *netif;
andrewbonney	0:18dd877d2c77	163
andrewbonney	0:18dd877d2c77	164	PERF_START;
andrewbonney	0:18dd877d2c77	165
andrewbonney	0:18dd877d2c77	166	/* RFC3927 2.7: do not forward link-local addresses */
andrewbonney	0:18dd877d2c77	167	if (ip_addr_islinklocal(&current_iphdr_dest)) {
andrewbonney	0:18dd877d2c77	168	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not forwarding LLA %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
andrewbonney	0:18dd877d2c77	169	ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
andrewbonney	0:18dd877d2c77	170	ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
andrewbonney	0:18dd877d2c77	171	goto return_noroute;
andrewbonney	0:18dd877d2c77	172	}
andrewbonney	0:18dd877d2c77	173
andrewbonney	0:18dd877d2c77	174	/* Find network interface where to forward this IP packet to. */
andrewbonney	0:18dd877d2c77	175	netif = ip_route(&current_iphdr_dest);
andrewbonney	0:18dd877d2c77	176	if (netif == NULL) {
andrewbonney	0:18dd877d2c77	177	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
andrewbonney	0:18dd877d2c77	178	ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
andrewbonney	0:18dd877d2c77	179	ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
andrewbonney	0:18dd877d2c77	180	goto return_noroute;
andrewbonney	0:18dd877d2c77	181	}
andrewbonney	0:18dd877d2c77	182	/* Do not forward packets onto the same network interface on which
andrewbonney	0:18dd877d2c77	183	* they arrived. */
andrewbonney	0:18dd877d2c77	184	if (netif == inp) {
andrewbonney	0:18dd877d2c77	185	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
andrewbonney	0:18dd877d2c77	186	goto return_noroute;
andrewbonney	0:18dd877d2c77	187	}
andrewbonney	0:18dd877d2c77	188
andrewbonney	0:18dd877d2c77	189	/* decrement TTL */
andrewbonney	0:18dd877d2c77	190	IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
andrewbonney	0:18dd877d2c77	191	/* send ICMP if TTL == 0 */
andrewbonney	0:18dd877d2c77	192	if (IPH_TTL(iphdr) == 0) {
andrewbonney	0:18dd877d2c77	193	snmp_inc_ipinhdrerrors();
andrewbonney	0:18dd877d2c77	194	#if LWIP_ICMP
andrewbonney	0:18dd877d2c77	195	/* Don't send ICMP messages in response to ICMP messages */
andrewbonney	0:18dd877d2c77	196	if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
andrewbonney	0:18dd877d2c77	197	icmp_time_exceeded(p, ICMP_TE_TTL);
andrewbonney	0:18dd877d2c77	198	}
andrewbonney	0:18dd877d2c77	199	#endif /* LWIP_ICMP */
andrewbonney	0:18dd877d2c77	200	return;
andrewbonney	0:18dd877d2c77	201	}
andrewbonney	0:18dd877d2c77	202
andrewbonney	0:18dd877d2c77	203	/* Incrementally update the IP checksum. */
andrewbonney	0:18dd877d2c77	204	if (IPH_CHKSUM(iphdr) >= PP_HTONS(0xffff - 0x100)) {
andrewbonney	0:18dd877d2c77	205	IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100) + 1);
andrewbonney	0:18dd877d2c77	206	} else {
andrewbonney	0:18dd877d2c77	207	IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100));
andrewbonney	0:18dd877d2c77	208	}
andrewbonney	0:18dd877d2c77	209
andrewbonney	0:18dd877d2c77	210	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
andrewbonney	0:18dd877d2c77	211	ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
andrewbonney	0:18dd877d2c77	212	ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
andrewbonney	0:18dd877d2c77	213
andrewbonney	0:18dd877d2c77	214	IP_STATS_INC(ip.fw);
andrewbonney	0:18dd877d2c77	215	IP_STATS_INC(ip.xmit);
andrewbonney	0:18dd877d2c77	216	snmp_inc_ipforwdatagrams();
andrewbonney	0:18dd877d2c77	217
andrewbonney	0:18dd877d2c77	218	PERF_STOP("ip_forward");
andrewbonney	0:18dd877d2c77	219	/* transmit pbuf on chosen interface */
andrewbonney	0:18dd877d2c77	220	netif->output(netif, p, &current_iphdr_dest);
andrewbonney	0:18dd877d2c77	221	return;
andrewbonney	0:18dd877d2c77	222	return_noroute:
andrewbonney	0:18dd877d2c77	223	snmp_inc_ipoutnoroutes();
andrewbonney	0:18dd877d2c77	224	}
andrewbonney	0:18dd877d2c77	225	#endif /* IP_FORWARD */
andrewbonney	0:18dd877d2c77	226
andrewbonney	0:18dd877d2c77	227	/**
andrewbonney	0:18dd877d2c77	228	* This function is called by the network interface device driver when
andrewbonney	0:18dd877d2c77	229	* an IP packet is received. The function does the basic checks of the
andrewbonney	0:18dd877d2c77	230	* IP header such as packet size being at least larger than the header
andrewbonney	0:18dd877d2c77	231	* size etc. If the packet was not destined for us, the packet is
andrewbonney	0:18dd877d2c77	232	* forwarded (using ip_forward). The IP checksum is always checked.
andrewbonney	0:18dd877d2c77	233	*
andrewbonney	0:18dd877d2c77	234	* Finally, the packet is sent to the upper layer protocol input function.
andrewbonney	0:18dd877d2c77	235	*
andrewbonney	0:18dd877d2c77	236	* @param p the received IP packet (p->payload points to IP header)
andrewbonney	0:18dd877d2c77	237	* @param inp the netif on which this packet was received
andrewbonney	0:18dd877d2c77	238	* @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
andrewbonney	0:18dd877d2c77	239	* processed, but currently always returns ERR_OK)
andrewbonney	0:18dd877d2c77	240	*/
andrewbonney	0:18dd877d2c77	241	err_t
andrewbonney	0:18dd877d2c77	242	ip_input(struct pbuf p, struct netif inp)
andrewbonney	0:18dd877d2c77	243	{
andrewbonney	0:18dd877d2c77	244	struct ip_hdr *iphdr;
andrewbonney	0:18dd877d2c77	245	struct netif *netif;
andrewbonney	0:18dd877d2c77	246	u16_t iphdr_hlen;
andrewbonney	0:18dd877d2c77	247	u16_t iphdr_len;
andrewbonney	0:18dd877d2c77	248	#if IP_ACCEPT_LINK_LAYER_ADDRESSING
andrewbonney	0:18dd877d2c77	249	int check_ip_src=1;
andrewbonney	0:18dd877d2c77	250	#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
andrewbonney	0:18dd877d2c77	251
andrewbonney	0:18dd877d2c77	252	IP_STATS_INC(ip.recv);
andrewbonney	0:18dd877d2c77	253	snmp_inc_ipinreceives();
andrewbonney	0:18dd877d2c77	254
andrewbonney	0:18dd877d2c77	255	/* identify the IP header */
andrewbonney	0:18dd877d2c77	256	iphdr = (struct ip_hdr *)p->payload;
andrewbonney	0:18dd877d2c77	257	if (IPH_V(iphdr) != 4) {
andrewbonney	0:18dd877d2c77	258	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
andrewbonney	0:18dd877d2c77	259	ip_debug_print(p);
andrewbonney	0:18dd877d2c77	260	pbuf_free(p);
andrewbonney	0:18dd877d2c77	261	IP_STATS_INC(ip.err);
andrewbonney	0:18dd877d2c77	262	IP_STATS_INC(ip.drop);
andrewbonney	0:18dd877d2c77	263	snmp_inc_ipinhdrerrors();
andrewbonney	0:18dd877d2c77	264	return ERR_OK;
andrewbonney	0:18dd877d2c77	265	}
andrewbonney	0:18dd877d2c77	266
andrewbonney	0:18dd877d2c77	267	/* obtain IP header length in number of 32-bit words */
andrewbonney	0:18dd877d2c77	268	iphdr_hlen = IPH_HL(iphdr);
andrewbonney	0:18dd877d2c77	269	/* calculate IP header length in bytes */
andrewbonney	0:18dd877d2c77	270	iphdr_hlen *= 4;
andrewbonney	0:18dd877d2c77	271	/* obtain ip length in bytes */
andrewbonney	0:18dd877d2c77	272	iphdr_len = ntohs(IPH_LEN(iphdr));
andrewbonney	0:18dd877d2c77	273
andrewbonney	0:18dd877d2c77	274	/* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
andrewbonney	0:18dd877d2c77	275	if ((iphdr_hlen > p->len) \|\| (iphdr_len > p->tot_len)) {
andrewbonney	0:18dd877d2c77	276	if (iphdr_hlen > p->len) {
andrewbonney	0:18dd877d2c77	277	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
andrewbonney	0:18dd877d2c77	278	("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
andrewbonney	0:18dd877d2c77	279	iphdr_hlen, p->len));
andrewbonney	0:18dd877d2c77	280	}
andrewbonney	0:18dd877d2c77	281	if (iphdr_len > p->tot_len) {
andrewbonney	0:18dd877d2c77	282	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
andrewbonney	0:18dd877d2c77	283	("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
andrewbonney	0:18dd877d2c77	284	iphdr_len, p->tot_len));
andrewbonney	0:18dd877d2c77	285	}
andrewbonney	0:18dd877d2c77	286	/* free (drop) packet pbufs */
andrewbonney	0:18dd877d2c77	287	pbuf_free(p);
andrewbonney	0:18dd877d2c77	288	IP_STATS_INC(ip.lenerr);
andrewbonney	0:18dd877d2c77	289	IP_STATS_INC(ip.drop);
andrewbonney	0:18dd877d2c77	290	snmp_inc_ipindiscards();
andrewbonney	0:18dd877d2c77	291	return ERR_OK;
andrewbonney	0:18dd877d2c77	292	}
andrewbonney	0:18dd877d2c77	293
andrewbonney	0:18dd877d2c77	294	/* verify checksum */
andrewbonney	0:18dd877d2c77	295	#if CHECKSUM_CHECK_IP
andrewbonney	0:18dd877d2c77	296	if (inet_chksum(iphdr, iphdr_hlen) != 0) {
andrewbonney	0:18dd877d2c77	297
andrewbonney	0:18dd877d2c77	298	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
andrewbonney	0:18dd877d2c77	299	("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
andrewbonney	0:18dd877d2c77	300	ip_debug_print(p);
andrewbonney	0:18dd877d2c77	301	pbuf_free(p);
andrewbonney	0:18dd877d2c77	302	IP_STATS_INC(ip.chkerr);
andrewbonney	0:18dd877d2c77	303	IP_STATS_INC(ip.drop);
andrewbonney	0:18dd877d2c77	304	snmp_inc_ipinhdrerrors();
andrewbonney	0:18dd877d2c77	305	return ERR_OK;
andrewbonney	0:18dd877d2c77	306	}
andrewbonney	0:18dd877d2c77	307	#endif
andrewbonney	0:18dd877d2c77	308
andrewbonney	0:18dd877d2c77	309	/* Trim pbuf. This should have been done at the netif layer,
andrewbonney	0:18dd877d2c77	310	* but we'll do it anyway just to be sure that its done. */
andrewbonney	0:18dd877d2c77	311	pbuf_realloc(p, iphdr_len);
andrewbonney	0:18dd877d2c77	312
andrewbonney	0:18dd877d2c77	313	/* copy IP addresses to aligned ip_addr_t */
andrewbonney	0:18dd877d2c77	314	ip_addr_copy(current_iphdr_dest, iphdr->dest);
andrewbonney	0:18dd877d2c77	315	ip_addr_copy(current_iphdr_src, iphdr->src);
andrewbonney	0:18dd877d2c77	316
andrewbonney	0:18dd877d2c77	317	/* match packet against an interface, i.e. is this packet for us? */
andrewbonney	0:18dd877d2c77	318	#if LWIP_IGMP
andrewbonney	0:18dd877d2c77	319	if (ip_addr_ismulticast(&current_iphdr_dest)) {
andrewbonney	0:18dd877d2c77	320	if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &current_iphdr_dest))) {
andrewbonney	0:18dd877d2c77	321	netif = inp;
andrewbonney	0:18dd877d2c77	322	} else {
andrewbonney	0:18dd877d2c77	323	netif = NULL;
andrewbonney	0:18dd877d2c77	324	}
andrewbonney	0:18dd877d2c77	325	} else
andrewbonney	0:18dd877d2c77	326	#endif /* LWIP_IGMP */
andrewbonney	0:18dd877d2c77	327	{
andrewbonney	0:18dd877d2c77	328	/* start trying with inp. if that's not acceptable, start walking the
andrewbonney	0:18dd877d2c77	329	list of configured netifs.
andrewbonney	0:18dd877d2c77	330	'first' is used as a boolean to mark whether we started walking the list */
andrewbonney	0:18dd877d2c77	331	int first = 1;
andrewbonney	0:18dd877d2c77	332	netif = inp;
andrewbonney	0:18dd877d2c77	333	do {
andrewbonney	0:18dd877d2c77	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",
andrewbonney	0:18dd877d2c77	335	ip4_addr_get_u32(&iphdr->dest), ip4_addr_get_u32(&netif->ip_addr),
andrewbonney	0:18dd877d2c77	336	ip4_addr_get_u32(&iphdr->dest) & ip4_addr_get_u32(&netif->netmask),
andrewbonney	0:18dd877d2c77	337	ip4_addr_get_u32(&netif->ip_addr) & ip4_addr_get_u32(&netif->netmask),
andrewbonney	0:18dd877d2c77	338	ip4_addr_get_u32(&iphdr->dest) & ~ip4_addr_get_u32(&netif->netmask)));
andrewbonney	0:18dd877d2c77	339
andrewbonney	0:18dd877d2c77	340	/* interface is up and configured? */
andrewbonney	0:18dd877d2c77	341	if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
andrewbonney	0:18dd877d2c77	342	/* unicast to this interface address? */
andrewbonney	0:18dd877d2c77	343	if (ip_addr_cmp(&current_iphdr_dest, &(netif->ip_addr)) \|\|
andrewbonney	0:18dd877d2c77	344	/* or broadcast on this interface network address? */
andrewbonney	0:18dd877d2c77	345	ip_addr_isbroadcast(&current_iphdr_dest, netif)) {
andrewbonney	0:18dd877d2c77	346	LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
andrewbonney	0:18dd877d2c77	347	netif->name[0], netif->name[1]));
andrewbonney	0:18dd877d2c77	348	/* break out of for loop */
andrewbonney	0:18dd877d2c77	349	break;
andrewbonney	0:18dd877d2c77	350	}
andrewbonney	0:18dd877d2c77	351	#if LWIP_AUTOIP
andrewbonney	0:18dd877d2c77	352	/* connections to link-local addresses must persist after changing
andrewbonney	0:18dd877d2c77	353	the netif's address (RFC3927 ch. 1.9) */
andrewbonney	0:18dd877d2c77	354	if ((netif->autoip != NULL) &&
andrewbonney	0:18dd877d2c77	355	ip_addr_cmp(&current_iphdr_dest, &(netif->autoip->llipaddr))) {
andrewbonney	0:18dd877d2c77	356	LWIP_DEBUGF(IP_DEBUG, ("ip_input: LLA packet accepted on interface %c%c\n",
andrewbonney	0:18dd877d2c77	357	netif->name[0], netif->name[1]));
andrewbonney	0:18dd877d2c77	358	/* break out of for loop */
andrewbonney	0:18dd877d2c77	359	break;
andrewbonney	0:18dd877d2c77	360	}
andrewbonney	0:18dd877d2c77	361	#endif /* LWIP_AUTOIP */
andrewbonney	0:18dd877d2c77	362	}
andrewbonney	0:18dd877d2c77	363	if (first) {
andrewbonney	0:18dd877d2c77	364	first = 0;
andrewbonney	0:18dd877d2c77	365	netif = netif_list;
andrewbonney	0:18dd877d2c77	366	} else {
andrewbonney	0:18dd877d2c77	367	netif = netif->next;
andrewbonney	0:18dd877d2c77	368	}
andrewbonney	0:18dd877d2c77	369	if (netif == inp) {
andrewbonney	0:18dd877d2c77	370	netif = netif->next;
andrewbonney	0:18dd877d2c77	371	}
andrewbonney	0:18dd877d2c77	372	} while(netif != NULL);
andrewbonney	0:18dd877d2c77	373	}
andrewbonney	0:18dd877d2c77	374
andrewbonney	0:18dd877d2c77	375	#if IP_ACCEPT_LINK_LAYER_ADDRESSING
andrewbonney	0:18dd877d2c77	376	/* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
andrewbonney	0:18dd877d2c77	377	* using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
andrewbonney	0:18dd877d2c77	378	* According to RFC 1542 section 3.1.1, referred by RFC 2131).
andrewbonney	0:18dd877d2c77	379	*
andrewbonney	0:18dd877d2c77	380	* If you want to accept private broadcast communication while a netif is down,
andrewbonney	0:18dd877d2c77	381	* define LWIP_IP_ACCEPT_UDP_PORT(dst_port), e.g.:
andrewbonney	0:18dd877d2c77	382	*
andrewbonney	0:18dd877d2c77	383	* #define LWIP_IP_ACCEPT_UDP_PORT(dst_port) ((dst_port) == PP_NTOHS(12345))
andrewbonney	0:18dd877d2c77	384	*/
andrewbonney	0:18dd877d2c77	385	if (netif == NULL) {
andrewbonney	0:18dd877d2c77	386	/* remote port is DHCP server? */
andrewbonney	0:18dd877d2c77	387	if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
andrewbonney	0:18dd877d2c77	388	struct udp_hdr udphdr = (struct udp_hdr )((u8_t *)iphdr + iphdr_hlen);
andrewbonney	0:18dd877d2c77	389	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
andrewbonney	0:18dd877d2c77	390	ntohs(udphdr->dest)));
andrewbonney	0:18dd877d2c77	391	if (IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(udphdr->dest)) {
andrewbonney	0:18dd877d2c77	392	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE, ("ip_input: DHCP packet accepted.\n"));
andrewbonney	0:18dd877d2c77	393	netif = inp;
andrewbonney	0:18dd877d2c77	394	check_ip_src = 0;
andrewbonney	0:18dd877d2c77	395	}
andrewbonney	0:18dd877d2c77	396	}
andrewbonney	0:18dd877d2c77	397	}
andrewbonney	0:18dd877d2c77	398	#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
andrewbonney	0:18dd877d2c77	399
andrewbonney	0:18dd877d2c77	400	/* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
andrewbonney	0:18dd877d2c77	401	#if IP_ACCEPT_LINK_LAYER_ADDRESSING
andrewbonney	0:18dd877d2c77	402	/* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
andrewbonney	0:18dd877d2c77	403	if (check_ip_src && !ip_addr_isany(&current_iphdr_src))
andrewbonney	0:18dd877d2c77	404	#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
andrewbonney	0:18dd877d2c77	405	{ if ((ip_addr_isbroadcast(&current_iphdr_src, inp)) \|\|
andrewbonney	0:18dd877d2c77	406	(ip_addr_ismulticast(&current_iphdr_src))) {
andrewbonney	0:18dd877d2c77	407	/* packet source is not valid */
andrewbonney	0:18dd877d2c77	408	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("ip_input: packet source is not valid.\n"));
andrewbonney	0:18dd877d2c77	409	/* free (drop) packet pbufs */
andrewbonney	0:18dd877d2c77	410	pbuf_free(p);
andrewbonney	0:18dd877d2c77	411	IP_STATS_INC(ip.drop);
andrewbonney	0:18dd877d2c77	412	snmp_inc_ipinaddrerrors();
andrewbonney	0:18dd877d2c77	413	snmp_inc_ipindiscards();
andrewbonney	0:18dd877d2c77	414	return ERR_OK;
andrewbonney	0:18dd877d2c77	415	}
andrewbonney	0:18dd877d2c77	416	}
andrewbonney	0:18dd877d2c77	417
andrewbonney	0:18dd877d2c77	418	/* packet not for us? */
andrewbonney	0:18dd877d2c77	419	if (netif == NULL) {
andrewbonney	0:18dd877d2c77	420	/* packet not for us, route or discard */
andrewbonney	0:18dd877d2c77	421	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE, ("ip_input: packet not for us.\n"));
andrewbonney	0:18dd877d2c77	422	#if IP_FORWARD
andrewbonney	0:18dd877d2c77	423	/* non-broadcast packet? */
andrewbonney	0:18dd877d2c77	424	if (!ip_addr_isbroadcast(&current_iphdr_dest, inp)) {
andrewbonney	0:18dd877d2c77	425	/* try to forward IP packet on (other) interfaces */
andrewbonney	0:18dd877d2c77	426	ip_forward(p, iphdr, inp);
andrewbonney	0:18dd877d2c77	427	} else
andrewbonney	0:18dd877d2c77	428	#endif /* IP_FORWARD */
andrewbonney	0:18dd877d2c77	429	{
andrewbonney	0:18dd877d2c77	430	snmp_inc_ipinaddrerrors();
andrewbonney	0:18dd877d2c77	431	snmp_inc_ipindiscards();
andrewbonney	0:18dd877d2c77	432	}
andrewbonney	0:18dd877d2c77	433	pbuf_free(p);
andrewbonney	0:18dd877d2c77	434	return ERR_OK;
andrewbonney	0:18dd877d2c77	435	}
andrewbonney	0:18dd877d2c77	436	/* packet consists of multiple fragments? */
andrewbonney	0:18dd877d2c77	437	if ((IPH_OFFSET(iphdr) & PP_HTONS(IP_OFFMASK \| IP_MF)) != 0) {
andrewbonney	0:18dd877d2c77	438	#if IP_REASSEMBLY /* packet fragment reassembly code present? */
andrewbonney	0:18dd877d2c77	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",
andrewbonney	0:18dd877d2c77	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));
andrewbonney	0:18dd877d2c77	441	/* reassemble the packet*/
andrewbonney	0:18dd877d2c77	442	p = ip_reass(p);
andrewbonney	0:18dd877d2c77	443	/* packet not fully reassembled yet? */
andrewbonney	0:18dd877d2c77	444	if (p == NULL) {
andrewbonney	0:18dd877d2c77	445	return ERR_OK;
andrewbonney	0:18dd877d2c77	446	}
andrewbonney	0:18dd877d2c77	447	iphdr = (struct ip_hdr *)p->payload;
andrewbonney	0:18dd877d2c77	448	#else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
andrewbonney	0:18dd877d2c77	449	pbuf_free(p);
andrewbonney	0:18dd877d2c77	450	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
andrewbonney	0:18dd877d2c77	451	ntohs(IPH_OFFSET(iphdr))));
andrewbonney	0:18dd877d2c77	452	IP_STATS_INC(ip.opterr);
andrewbonney	0:18dd877d2c77	453	IP_STATS_INC(ip.drop);
andrewbonney	0:18dd877d2c77	454	/* unsupported protocol feature */
andrewbonney	0:18dd877d2c77	455	snmp_inc_ipinunknownprotos();
andrewbonney	0:18dd877d2c77	456	return ERR_OK;
andrewbonney	0:18dd877d2c77	457	#endif /* IP_REASSEMBLY */
andrewbonney	0:18dd877d2c77	458	}
andrewbonney	0:18dd877d2c77	459
andrewbonney	0:18dd877d2c77	460	#if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
andrewbonney	0:18dd877d2c77	461
andrewbonney	0:18dd877d2c77	462	#if LWIP_IGMP
andrewbonney	0:18dd877d2c77	463	/* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
andrewbonney	0:18dd877d2c77	464	if((iphdr_hlen > IP_HLEN) && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
andrewbonney	0:18dd877d2c77	465	#else
andrewbonney	0:18dd877d2c77	466	if (iphdr_hlen > IP_HLEN) {
andrewbonney	0:18dd877d2c77	467	#endif /* LWIP_IGMP */
andrewbonney	0:18dd877d2c77	468	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
andrewbonney	0:18dd877d2c77	469	pbuf_free(p);
andrewbonney	0:18dd877d2c77	470	IP_STATS_INC(ip.opterr);
andrewbonney	0:18dd877d2c77	471	IP_STATS_INC(ip.drop);
andrewbonney	0:18dd877d2c77	472	/* unsupported protocol feature */
andrewbonney	0:18dd877d2c77	473	snmp_inc_ipinunknownprotos();
andrewbonney	0:18dd877d2c77	474	return ERR_OK;
andrewbonney	0:18dd877d2c77	475	}
andrewbonney	0:18dd877d2c77	476	#endif /* IP_OPTIONS_ALLOWED == 0 */
andrewbonney	0:18dd877d2c77	477
andrewbonney	0:18dd877d2c77	478	/* send to upper layers */
andrewbonney	0:18dd877d2c77	479	LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
andrewbonney	0:18dd877d2c77	480	ip_debug_print(p);
andrewbonney	0:18dd877d2c77	481	LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
andrewbonney	0:18dd877d2c77	482
andrewbonney	0:18dd877d2c77	483	current_netif = inp;
andrewbonney	0:18dd877d2c77	484	current_header = iphdr;
andrewbonney	0:18dd877d2c77	485
andrewbonney	0:18dd877d2c77	486	#if LWIP_RAW
andrewbonney	0:18dd877d2c77	487	/* raw input did not eat the packet? */
andrewbonney	0:18dd877d2c77	488	if (raw_input(p, inp) == 0)
andrewbonney	0:18dd877d2c77	489	#endif /* LWIP_RAW */
andrewbonney	0:18dd877d2c77	490	{
andrewbonney	0:18dd877d2c77	491
andrewbonney	0:18dd877d2c77	492	switch (IPH_PROTO(iphdr)) {
andrewbonney	0:18dd877d2c77	493	#if LWIP_UDP
andrewbonney	0:18dd877d2c77	494	case IP_PROTO_UDP:
andrewbonney	0:18dd877d2c77	495	#if LWIP_UDPLITE
andrewbonney	0:18dd877d2c77	496	case IP_PROTO_UDPLITE:
andrewbonney	0:18dd877d2c77	497	#endif /* LWIP_UDPLITE */
andrewbonney	0:18dd877d2c77	498	snmp_inc_ipindelivers();
andrewbonney	0:18dd877d2c77	499	udp_input(p, inp);
andrewbonney	0:18dd877d2c77	500	break;
andrewbonney	0:18dd877d2c77	501	#endif /* LWIP_UDP */
andrewbonney	0:18dd877d2c77	502	#if LWIP_TCP
andrewbonney	0:18dd877d2c77	503	case IP_PROTO_TCP:
andrewbonney	0:18dd877d2c77	504	snmp_inc_ipindelivers();
andrewbonney	0:18dd877d2c77	505	tcp_input(p, inp);
andrewbonney	0:18dd877d2c77	506	break;
andrewbonney	0:18dd877d2c77	507	#endif /* LWIP_TCP */
andrewbonney	0:18dd877d2c77	508	#if LWIP_ICMP
andrewbonney	0:18dd877d2c77	509	case IP_PROTO_ICMP:
andrewbonney	0:18dd877d2c77	510	snmp_inc_ipindelivers();
andrewbonney	0:18dd877d2c77	511	icmp_input(p, inp);
andrewbonney	0:18dd877d2c77	512	break;
andrewbonney	0:18dd877d2c77	513	#endif /* LWIP_ICMP */
andrewbonney	0:18dd877d2c77	514	#if LWIP_IGMP
andrewbonney	0:18dd877d2c77	515	case IP_PROTO_IGMP:
andrewbonney	0:18dd877d2c77	516	igmp_input(p, inp, &current_iphdr_dest);
andrewbonney	0:18dd877d2c77	517	break;
andrewbonney	0:18dd877d2c77	518	#endif /* LWIP_IGMP */
andrewbonney	0:18dd877d2c77	519	default:
andrewbonney	0:18dd877d2c77	520	#if LWIP_ICMP
andrewbonney	0:18dd877d2c77	521	/* send ICMP destination protocol unreachable unless is was a broadcast */
andrewbonney	0:18dd877d2c77	522	if (!ip_addr_isbroadcast(&current_iphdr_dest, inp) &&
andrewbonney	0:18dd877d2c77	523	!ip_addr_ismulticast(&current_iphdr_dest)) {
andrewbonney	0:18dd877d2c77	524	p->payload = iphdr;
andrewbonney	0:18dd877d2c77	525	icmp_dest_unreach(p, ICMP_DUR_PROTO);
andrewbonney	0:18dd877d2c77	526	}
andrewbonney	0:18dd877d2c77	527	#endif /* LWIP_ICMP */
andrewbonney	0:18dd877d2c77	528	pbuf_free(p);
andrewbonney	0:18dd877d2c77	529
andrewbonney	0:18dd877d2c77	530	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
andrewbonney	0:18dd877d2c77	531
andrewbonney	0:18dd877d2c77	532	IP_STATS_INC(ip.proterr);
andrewbonney	0:18dd877d2c77	533	IP_STATS_INC(ip.drop);
andrewbonney	0:18dd877d2c77	534	snmp_inc_ipinunknownprotos();
andrewbonney	0:18dd877d2c77	535	}
andrewbonney	0:18dd877d2c77	536	}
andrewbonney	0:18dd877d2c77	537
andrewbonney	0:18dd877d2c77	538	current_netif = NULL;
andrewbonney	0:18dd877d2c77	539	current_header = NULL;
andrewbonney	0:18dd877d2c77	540	ip_addr_set_any(&current_iphdr_src);
andrewbonney	0:18dd877d2c77	541	ip_addr_set_any(&current_iphdr_dest);
andrewbonney	0:18dd877d2c77	542
andrewbonney	0:18dd877d2c77	543	return ERR_OK;
andrewbonney	0:18dd877d2c77	544	}
andrewbonney	0:18dd877d2c77	545
andrewbonney	0:18dd877d2c77	546	/**
andrewbonney	0:18dd877d2c77	547	* Sends an IP packet on a network interface. This function constructs
andrewbonney	0:18dd877d2c77	548	* the IP header and calculates the IP header checksum. If the source
andrewbonney	0:18dd877d2c77	549	* IP address is NULL, the IP address of the outgoing network
andrewbonney	0:18dd877d2c77	550	* interface is filled in as source address.
andrewbonney	0:18dd877d2c77	551	* If the destination IP address is IP_HDRINCL, p is assumed to already
andrewbonney	0:18dd877d2c77	552	* include an IP header and p->payload points to it instead of the data.
andrewbonney	0:18dd877d2c77	553	*
andrewbonney	0:18dd877d2c77	554	* @param p the packet to send (p->payload points to the data, e.g. next
andrewbonney	0:18dd877d2c77	555	protocol header; if dest == IP_HDRINCL, p already includes an IP
andrewbonney	0:18dd877d2c77	556	header and p->payload points to that IP header)
andrewbonney	0:18dd877d2c77	557	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
andrewbonney	0:18dd877d2c77	558	* IP address of the netif used to send is used as source address)
andrewbonney	0:18dd877d2c77	559	* @param dest the destination IP address to send the packet to
andrewbonney	0:18dd877d2c77	560	* @param ttl the TTL value to be set in the IP header
andrewbonney	0:18dd877d2c77	561	* @param tos the TOS value to be set in the IP header
andrewbonney	0:18dd877d2c77	562	* @param proto the PROTOCOL to be set in the IP header
andrewbonney	0:18dd877d2c77	563	* @param netif the netif on which to send this packet
andrewbonney	0:18dd877d2c77	564	* @return ERR_OK if the packet was sent OK
andrewbonney	0:18dd877d2c77	565	* ERR_BUF if p doesn't have enough space for IP/LINK headers
andrewbonney	0:18dd877d2c77	566	* returns errors returned by netif->output
andrewbonney	0:18dd877d2c77	567	*
andrewbonney	0:18dd877d2c77	568	* @note ip_id: RFC791 "some host may be able to simply use
andrewbonney	0:18dd877d2c77	569	* unique identifiers independent of destination"
andrewbonney	0:18dd877d2c77	570	*/
andrewbonney	0:18dd877d2c77	571	err_t
andrewbonney	0:18dd877d2c77	572	ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
andrewbonney	0:18dd877d2c77	573	u8_t ttl, u8_t tos,
andrewbonney	0:18dd877d2c77	574	u8_t proto, struct netif *netif)
andrewbonney	0:18dd877d2c77	575	{
andrewbonney	0:18dd877d2c77	576	#if IP_OPTIONS_SEND
andrewbonney	0:18dd877d2c77	577	return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
andrewbonney	0:18dd877d2c77	578	}
andrewbonney	0:18dd877d2c77	579
andrewbonney	0:18dd877d2c77	580	/**
andrewbonney	0:18dd877d2c77	581	* Same as ip_output_if() but with the possibility to include IP options:
andrewbonney	0:18dd877d2c77	582	*
andrewbonney	0:18dd877d2c77	583	* @ param ip_options pointer to the IP options, copied into the IP header
andrewbonney	0:18dd877d2c77	584	* @ param optlen length of ip_options
andrewbonney	0:18dd877d2c77	585	*/
andrewbonney	0:18dd877d2c77	586	err_t ip_output_if_opt(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
andrewbonney	0:18dd877d2c77	587	u8_t ttl, u8_t tos, u8_t proto, struct netif netif, void ip_options,
andrewbonney	0:18dd877d2c77	588	u16_t optlen)
andrewbonney	0:18dd877d2c77	589	{
andrewbonney	0:18dd877d2c77	590	#endif /* IP_OPTIONS_SEND */
andrewbonney	0:18dd877d2c77	591	struct ip_hdr *iphdr;
andrewbonney	0:18dd877d2c77	592	ip_addr_t dest_addr;
andrewbonney	0:18dd877d2c77	593	#if CHECKSUM_GEN_IP_INLINE
andrewbonney	0:18dd877d2c77	594	u32_t chk_sum = 0;
andrewbonney	0:18dd877d2c77	595	#endif /* CHECKSUM_GEN_IP_INLINE */
andrewbonney	0:18dd877d2c77	596
andrewbonney	0:18dd877d2c77	597	/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
andrewbonney	0:18dd877d2c77	598	gets altered as the packet is passed down the stack */
andrewbonney	0:18dd877d2c77	599	LWIP_ASSERT("p->ref == 1", p->ref == 1);
andrewbonney	0:18dd877d2c77	600
andrewbonney	0:18dd877d2c77	601	snmp_inc_ipoutrequests();
andrewbonney	0:18dd877d2c77	602
andrewbonney	0:18dd877d2c77	603	/* Should the IP header be generated or is it already included in p? */
andrewbonney	0:18dd877d2c77	604	if (dest != IP_HDRINCL) {
andrewbonney	0:18dd877d2c77	605	u16_t ip_hlen = IP_HLEN;
andrewbonney	0:18dd877d2c77	606	#if IP_OPTIONS_SEND
andrewbonney	0:18dd877d2c77	607	u16_t optlen_aligned = 0;
andrewbonney	0:18dd877d2c77	608	if (optlen != 0) {
andrewbonney	0:18dd877d2c77	609	#if CHECKSUM_GEN_IP_INLINE
andrewbonney	0:18dd877d2c77	610	int i;
andrewbonney	0:18dd877d2c77	611	#endif /* CHECKSUM_GEN_IP_INLINE */
andrewbonney	0:18dd877d2c77	612	/* round up to a multiple of 4 */
andrewbonney	0:18dd877d2c77	613	optlen_aligned = ((optlen + 3) & ~3);
andrewbonney	0:18dd877d2c77	614	ip_hlen += optlen_aligned;
andrewbonney	0:18dd877d2c77	615	/* First write in the IP options */
andrewbonney	0:18dd877d2c77	616	if (pbuf_header(p, optlen_aligned)) {
andrewbonney	0:18dd877d2c77	617	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
andrewbonney	0:18dd877d2c77	618	IP_STATS_INC(ip.err);
andrewbonney	0:18dd877d2c77	619	snmp_inc_ipoutdiscards();
andrewbonney	0:18dd877d2c77	620	return ERR_BUF;
andrewbonney	0:18dd877d2c77	621	}
andrewbonney	0:18dd877d2c77	622	MEMCPY(p->payload, ip_options, optlen);
andrewbonney	0:18dd877d2c77	623	if (optlen < optlen_aligned) {
andrewbonney	0:18dd877d2c77	624	/* zero the remaining bytes */
andrewbonney	0:18dd877d2c77	625	memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
andrewbonney	0:18dd877d2c77	626	}
andrewbonney	0:18dd877d2c77	627	#if CHECKSUM_GEN_IP_INLINE
andrewbonney	0:18dd877d2c77	628	for (i = 0; i < optlen_aligned; i += sizeof(u16_t)) {
andrewbonney	0:18dd877d2c77	629	chk_sum += ((u16_t*)p->payload)[i];
andrewbonney	0:18dd877d2c77	630	}
andrewbonney	0:18dd877d2c77	631	#endif /* CHECKSUM_GEN_IP_INLINE */
andrewbonney	0:18dd877d2c77	632	}
andrewbonney	0:18dd877d2c77	633	#endif /* IP_OPTIONS_SEND */
andrewbonney	0:18dd877d2c77	634	/* generate IP header */
andrewbonney	0:18dd877d2c77	635	if (pbuf_header(p, IP_HLEN)) {
andrewbonney	0:18dd877d2c77	636	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("ip_output: not enough room for IP header in pbuf\n"));
andrewbonney	0:18dd877d2c77	637
andrewbonney	0:18dd877d2c77	638	IP_STATS_INC(ip.err);
andrewbonney	0:18dd877d2c77	639	snmp_inc_ipoutdiscards();
andrewbonney	0:18dd877d2c77	640	return ERR_BUF;
andrewbonney	0:18dd877d2c77	641	}
andrewbonney	0:18dd877d2c77	642
andrewbonney	0:18dd877d2c77	643	iphdr = (struct ip_hdr *)p->payload;
andrewbonney	0:18dd877d2c77	644	LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
andrewbonney	0:18dd877d2c77	645	(p->len >= sizeof(struct ip_hdr)));
andrewbonney	0:18dd877d2c77	646
andrewbonney	0:18dd877d2c77	647	IPH_TTL_SET(iphdr, ttl);
andrewbonney	0:18dd877d2c77	648	IPH_PROTO_SET(iphdr, proto);
andrewbonney	0:18dd877d2c77	649	#if CHECKSUM_GEN_IP_INLINE
andrewbonney	0:18dd877d2c77	650	chk_sum += LWIP_MAKE_U16(proto, ttl);
andrewbonney	0:18dd877d2c77	651	#endif /* CHECKSUM_GEN_IP_INLINE */
andrewbonney	0:18dd877d2c77	652
andrewbonney	0:18dd877d2c77	653	/* dest cannot be NULL here */
andrewbonney	0:18dd877d2c77	654	ip_addr_copy(iphdr->dest, *dest);
andrewbonney	0:18dd877d2c77	655	#if CHECKSUM_GEN_IP_INLINE
andrewbonney	0:18dd877d2c77	656	chk_sum += ip4_addr_get_u32(&iphdr->dest) & 0xFFFF;
andrewbonney	0:18dd877d2c77	657	chk_sum += ip4_addr_get_u32(&iphdr->dest) >> 16;
andrewbonney	0:18dd877d2c77	658	#endif /* CHECKSUM_GEN_IP_INLINE */
andrewbonney	0:18dd877d2c77	659
andrewbonney	0:18dd877d2c77	660	IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
andrewbonney	0:18dd877d2c77	661	#if CHECKSUM_GEN_IP_INLINE
andrewbonney	0:18dd877d2c77	662	chk_sum += iphdr->_v_hl_tos;
andrewbonney	0:18dd877d2c77	663	#endif /* CHECKSUM_GEN_IP_INLINE */
andrewbonney	0:18dd877d2c77	664	IPH_LEN_SET(iphdr, htons(p->tot_len));
andrewbonney	0:18dd877d2c77	665	#if CHECKSUM_GEN_IP_INLINE
andrewbonney	0:18dd877d2c77	666	chk_sum += iphdr->_len;
andrewbonney	0:18dd877d2c77	667	#endif /* CHECKSUM_GEN_IP_INLINE */
andrewbonney	0:18dd877d2c77	668	IPH_OFFSET_SET(iphdr, 0);
andrewbonney	0:18dd877d2c77	669	IPH_ID_SET(iphdr, htons(ip_id));
andrewbonney	0:18dd877d2c77	670	#if CHECKSUM_GEN_IP_INLINE
andrewbonney	0:18dd877d2c77	671	chk_sum += iphdr->_id;
andrewbonney	0:18dd877d2c77	672	#endif /* CHECKSUM_GEN_IP_INLINE */
andrewbonney	0:18dd877d2c77	673	++ip_id;
andrewbonney	0:18dd877d2c77	674
andrewbonney	0:18dd877d2c77	675	if (ip_addr_isany(src)) {
andrewbonney	0:18dd877d2c77	676	ip_addr_copy(iphdr->src, netif->ip_addr);
andrewbonney	0:18dd877d2c77	677	} else {
andrewbonney	0:18dd877d2c77	678	/* src cannot be NULL here */
andrewbonney	0:18dd877d2c77	679	ip_addr_copy(iphdr->src, *src);
andrewbonney	0:18dd877d2c77	680	}
andrewbonney	0:18dd877d2c77	681
andrewbonney	0:18dd877d2c77	682	#if CHECKSUM_GEN_IP_INLINE
andrewbonney	0:18dd877d2c77	683	chk_sum += ip4_addr_get_u32(&iphdr->src) & 0xFFFF;
andrewbonney	0:18dd877d2c77	684	chk_sum += ip4_addr_get_u32(&iphdr->src) >> 16;
andrewbonney	0:18dd877d2c77	685	chk_sum = (chk_sum >> 16) + (chk_sum & 0xFFFF);
andrewbonney	0:18dd877d2c77	686	chk_sum = (chk_sum >> 16) + chk_sum;
andrewbonney	0:18dd877d2c77	687	chk_sum = ~chk_sum;
andrewbonney	0:18dd877d2c77	688	iphdr->_chksum = chk_sum; /* network order */
andrewbonney	0:18dd877d2c77	689	#else /* CHECKSUM_GEN_IP_INLINE */
andrewbonney	0:18dd877d2c77	690	IPH_CHKSUM_SET(iphdr, 0);
andrewbonney	0:18dd877d2c77	691	#if CHECKSUM_GEN_IP
andrewbonney	0:18dd877d2c77	692	IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
andrewbonney	0:18dd877d2c77	693	#endif
andrewbonney	0:18dd877d2c77	694	#endif /* CHECKSUM_GEN_IP_INLINE */
andrewbonney	0:18dd877d2c77	695	} else {
andrewbonney	0:18dd877d2c77	696	/* IP header already included in p */
andrewbonney	0:18dd877d2c77	697	iphdr = (struct ip_hdr *)p->payload;
andrewbonney	0:18dd877d2c77	698	ip_addr_copy(dest_addr, iphdr->dest);
andrewbonney	0:18dd877d2c77	699	dest = &dest_addr;
andrewbonney	0:18dd877d2c77	700	}
andrewbonney	0:18dd877d2c77	701
andrewbonney	0:18dd877d2c77	702	IP_STATS_INC(ip.xmit);
andrewbonney	0:18dd877d2c77	703
andrewbonney	0:18dd877d2c77	704	LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
andrewbonney	0:18dd877d2c77	705	ip_debug_print(p);
andrewbonney	0:18dd877d2c77	706
andrewbonney	0:18dd877d2c77	707	#if ENABLE_LOOPBACK
andrewbonney	0:18dd877d2c77	708	if (ip_addr_cmp(dest, &netif->ip_addr)) {
andrewbonney	0:18dd877d2c77	709	/* Packet to self, enqueue it for loopback */
andrewbonney	0:18dd877d2c77	710	LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
andrewbonney	0:18dd877d2c77	711	return netif_loop_output(netif, p, dest);
andrewbonney	0:18dd877d2c77	712	}
andrewbonney	0:18dd877d2c77	713	#if LWIP_IGMP
andrewbonney	0:18dd877d2c77	714	if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) {
andrewbonney	0:18dd877d2c77	715	netif_loop_output(netif, p, dest);
andrewbonney	0:18dd877d2c77	716	}
andrewbonney	0:18dd877d2c77	717	#endif /* LWIP_IGMP */
andrewbonney	0:18dd877d2c77	718	#endif /* ENABLE_LOOPBACK */
andrewbonney	0:18dd877d2c77	719	#if IP_FRAG
andrewbonney	0:18dd877d2c77	720	/* don't fragment if interface has mtu set to 0 [loopif] */
andrewbonney	0:18dd877d2c77	721	if (netif->mtu && (p->tot_len > netif->mtu)) {
andrewbonney	0:18dd877d2c77	722	return ip_frag(p, netif, dest);
andrewbonney	0:18dd877d2c77	723	}
andrewbonney	0:18dd877d2c77	724	#endif /* IP_FRAG */
andrewbonney	0:18dd877d2c77	725
andrewbonney	0:18dd877d2c77	726	LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
andrewbonney	0:18dd877d2c77	727	return netif->output(netif, p, dest);
andrewbonney	0:18dd877d2c77	728	}
andrewbonney	0:18dd877d2c77	729
andrewbonney	0:18dd877d2c77	730	/**
andrewbonney	0:18dd877d2c77	731	* Simple interface to ip_output_if. It finds the outgoing network
andrewbonney	0:18dd877d2c77	732	* interface and calls upon ip_output_if to do the actual work.
andrewbonney	0:18dd877d2c77	733	*
andrewbonney	0:18dd877d2c77	734	* @param p the packet to send (p->payload points to the data, e.g. next
andrewbonney	0:18dd877d2c77	735	protocol header; if dest == IP_HDRINCL, p already includes an IP
andrewbonney	0:18dd877d2c77	736	header and p->payload points to that IP header)
andrewbonney	0:18dd877d2c77	737	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
andrewbonney	0:18dd877d2c77	738	* IP address of the netif used to send is used as source address)
andrewbonney	0:18dd877d2c77	739	* @param dest the destination IP address to send the packet to
andrewbonney	0:18dd877d2c77	740	* @param ttl the TTL value to be set in the IP header
andrewbonney	0:18dd877d2c77	741	* @param tos the TOS value to be set in the IP header
andrewbonney	0:18dd877d2c77	742	* @param proto the PROTOCOL to be set in the IP header
andrewbonney	0:18dd877d2c77	743	*
andrewbonney	0:18dd877d2c77	744	* @return ERR_RTE if no route is found
andrewbonney	0:18dd877d2c77	745	* see ip_output_if() for more return values
andrewbonney	0:18dd877d2c77	746	*/
andrewbonney	0:18dd877d2c77	747	err_t
andrewbonney	0:18dd877d2c77	748	ip_output(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
andrewbonney	0:18dd877d2c77	749	u8_t ttl, u8_t tos, u8_t proto)
andrewbonney	0:18dd877d2c77	750	{
andrewbonney	0:18dd877d2c77	751	struct netif *netif;
andrewbonney	0:18dd877d2c77	752
andrewbonney	0:18dd877d2c77	753	/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
andrewbonney	0:18dd877d2c77	754	gets altered as the packet is passed down the stack */
andrewbonney	0:18dd877d2c77	755	LWIP_ASSERT("p->ref == 1", p->ref == 1);
andrewbonney	0:18dd877d2c77	756
andrewbonney	0:18dd877d2c77	757	if ((netif = ip_route(dest)) == NULL) {
andrewbonney	0:18dd877d2c77	758	LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
andrewbonney	0:18dd877d2c77	759	ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
andrewbonney	0:18dd877d2c77	760	IP_STATS_INC(ip.rterr);
andrewbonney	0:18dd877d2c77	761	return ERR_RTE;
andrewbonney	0:18dd877d2c77	762	}
andrewbonney	0:18dd877d2c77	763
andrewbonney	0:18dd877d2c77	764	return ip_output_if(p, src, dest, ttl, tos, proto, netif);
andrewbonney	0:18dd877d2c77	765	}
andrewbonney	0:18dd877d2c77	766
andrewbonney	0:18dd877d2c77	767	#if LWIP_NETIF_HWADDRHINT
andrewbonney	0:18dd877d2c77	768	/** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
andrewbonney	0:18dd877d2c77	769	* before calling ip_output_if.
andrewbonney	0:18dd877d2c77	770	*
andrewbonney	0:18dd877d2c77	771	* @param p the packet to send (p->payload points to the data, e.g. next
andrewbonney	0:18dd877d2c77	772	protocol header; if dest == IP_HDRINCL, p already includes an IP
andrewbonney	0:18dd877d2c77	773	header and p->payload points to that IP header)
andrewbonney	0:18dd877d2c77	774	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
andrewbonney	0:18dd877d2c77	775	* IP address of the netif used to send is used as source address)
andrewbonney	0:18dd877d2c77	776	* @param dest the destination IP address to send the packet to
andrewbonney	0:18dd877d2c77	777	* @param ttl the TTL value to be set in the IP header
andrewbonney	0:18dd877d2c77	778	* @param tos the TOS value to be set in the IP header
andrewbonney	0:18dd877d2c77	779	* @param proto the PROTOCOL to be set in the IP header
andrewbonney	0:18dd877d2c77	780	* @param addr_hint address hint pointer set to netif->addr_hint before
andrewbonney	0:18dd877d2c77	781	* calling ip_output_if()
andrewbonney	0:18dd877d2c77	782	*
andrewbonney	0:18dd877d2c77	783	* @return ERR_RTE if no route is found
andrewbonney	0:18dd877d2c77	784	* see ip_output_if() for more return values
andrewbonney	0:18dd877d2c77	785	*/
andrewbonney	0:18dd877d2c77	786	err_t
andrewbonney	0:18dd877d2c77	787	ip_output_hinted(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
andrewbonney	0:18dd877d2c77	788	u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
andrewbonney	0:18dd877d2c77	789	{
andrewbonney	0:18dd877d2c77	790	struct netif *netif;
andrewbonney	0:18dd877d2c77	791	err_t err;
andrewbonney	0:18dd877d2c77	792
andrewbonney	0:18dd877d2c77	793	/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
andrewbonney	0:18dd877d2c77	794	gets altered as the packet is passed down the stack */
andrewbonney	0:18dd877d2c77	795	LWIP_ASSERT("p->ref == 1", p->ref == 1);
andrewbonney	0:18dd877d2c77	796
andrewbonney	0:18dd877d2c77	797	if ((netif = ip_route(dest)) == NULL) {
andrewbonney	0:18dd877d2c77	798	LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
andrewbonney	0:18dd877d2c77	799	ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
andrewbonney	0:18dd877d2c77	800	IP_STATS_INC(ip.rterr);
andrewbonney	0:18dd877d2c77	801	return ERR_RTE;
andrewbonney	0:18dd877d2c77	802	}
andrewbonney	0:18dd877d2c77	803
andrewbonney	0:18dd877d2c77	804	netif->addr_hint = addr_hint;
andrewbonney	0:18dd877d2c77	805	err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
andrewbonney	0:18dd877d2c77	806	netif->addr_hint = NULL;
andrewbonney	0:18dd877d2c77	807
andrewbonney	0:18dd877d2c77	808	return err;
andrewbonney	0:18dd877d2c77	809	}
andrewbonney	0:18dd877d2c77	810	#endif /* LWIP_NETIF_HWADDRHINT*/
andrewbonney	0:18dd877d2c77	811
andrewbonney	0:18dd877d2c77	812	#if IP_DEBUG
andrewbonney	0:18dd877d2c77	813	/* Print an IP header by using LWIP_DEBUGF
andrewbonney	0:18dd877d2c77	814	* @param p an IP packet, p->payload pointing to the IP header
andrewbonney	0:18dd877d2c77	815	*/
andrewbonney	0:18dd877d2c77	816	void
andrewbonney	0:18dd877d2c77	817	ip_debug_print(struct pbuf *p)
andrewbonney	0:18dd877d2c77	818	{
andrewbonney	0:18dd877d2c77	819	struct ip_hdr iphdr = (struct ip_hdr )p->payload;
andrewbonney	0:18dd877d2c77	820	u8_t *payload;
andrewbonney	0:18dd877d2c77	821
andrewbonney	0:18dd877d2c77	822	payload = (u8_t *)iphdr + IP_HLEN;
andrewbonney	0:18dd877d2c77	823
andrewbonney	0:18dd877d2c77	824	LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
andrewbonney	0:18dd877d2c77	825	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
andrewbonney	0:18dd877d2c77	826	LWIP_DEBUGF(IP_DEBUG, ("\|%2"S16_F" \|%2"S16_F" \| 0x%02"X16_F" \| %5"U16_F" \| (v, hl, tos, len)\n",
andrewbonney	0:18dd877d2c77	827	IPH_V(iphdr),
andrewbonney	0:18dd877d2c77	828	IPH_HL(iphdr),
andrewbonney	0:18dd877d2c77	829	IPH_TOS(iphdr),
andrewbonney	0:18dd877d2c77	830	ntohs(IPH_LEN(iphdr))));
andrewbonney	0:18dd877d2c77	831	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
andrewbonney	0:18dd877d2c77	832	LWIP_DEBUGF(IP_DEBUG, ("\| %5"U16_F" \|%"U16_F"%"U16_F"%"U16_F"\| %4"U16_F" \| (id, flags, offset)\n",
andrewbonney	0:18dd877d2c77	833	ntohs(IPH_ID(iphdr)),
andrewbonney	0:18dd877d2c77	834	ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
andrewbonney	0:18dd877d2c77	835	ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
andrewbonney	0:18dd877d2c77	836	ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
andrewbonney	0:18dd877d2c77	837	ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
andrewbonney	0:18dd877d2c77	838	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
andrewbonney	0:18dd877d2c77	839	LWIP_DEBUGF(IP_DEBUG, ("\| %3"U16_F" \| %3"U16_F" \| 0x%04"X16_F" \| (ttl, proto, chksum)\n",
andrewbonney	0:18dd877d2c77	840	IPH_TTL(iphdr),
andrewbonney	0:18dd877d2c77	841	IPH_PROTO(iphdr),
andrewbonney	0:18dd877d2c77	842	ntohs(IPH_CHKSUM(iphdr))));
andrewbonney	0:18dd877d2c77	843	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
andrewbonney	0:18dd877d2c77	844	LWIP_DEBUGF(IP_DEBUG, ("\| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| (src)\n",
andrewbonney	0:18dd877d2c77	845	ip4_addr1_16(&iphdr->src),
andrewbonney	0:18dd877d2c77	846	ip4_addr2_16(&iphdr->src),
andrewbonney	0:18dd877d2c77	847	ip4_addr3_16(&iphdr->src),
andrewbonney	0:18dd877d2c77	848	ip4_addr4_16(&iphdr->src)));
andrewbonney	0:18dd877d2c77	849	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
andrewbonney	0:18dd877d2c77	850	LWIP_DEBUGF(IP_DEBUG, ("\| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| (dest)\n",
andrewbonney	0:18dd877d2c77	851	ip4_addr1_16(&iphdr->dest),
andrewbonney	0:18dd877d2c77	852	ip4_addr2_16(&iphdr->dest),
andrewbonney	0:18dd877d2c77	853	ip4_addr3_16(&iphdr->dest),
andrewbonney	0:18dd877d2c77	854	ip4_addr4_16(&iphdr->dest)));
andrewbonney	0:18dd877d2c77	855	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
andrewbonney	0:18dd877d2c77	856	}
andrewbonney	0:18dd877d2c77	857	#endif /* IP_DEBUG */

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Type:	Library
Created:	26 May 2011
Imports:	33
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

lwip/core/ipv4/ip.c@0:18dd877d2c77, 2011-05-26 (annotated)

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