Bonjour - First step: AutoIP compiled in and working

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Darran Shepherd / Mbed 2 deprecated Bonjour

First step: AutoIP compiled in and working

lwip/core/ipv4/ip.c@1:4218cacaf696, 2010-06-18 (annotated)

Committer:: darran
Date:: Fri Jun 18 15:54:21 2010 +0000
Revision:: 1:4218cacaf696
Parent:: 0:55a05330f8cc

Who changed what in which revision?

User	Revision	Line number	New contents of line
darran	0:55a05330f8cc	1	/**
darran	0:55a05330f8cc	2	* @file
darran	0:55a05330f8cc	3	* This is the IPv4 layer implementation for incoming and outgoing IP traffic.
darran	0:55a05330f8cc	4	*
darran	0:55a05330f8cc	5	* @see ip_frag.c
darran	0:55a05330f8cc	6	*
darran	0:55a05330f8cc	7	*/
darran	0:55a05330f8cc	8
darran	0:55a05330f8cc	9	/*
darran	0:55a05330f8cc	10	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
darran	0:55a05330f8cc	11	* All rights reserved.
darran	0:55a05330f8cc	12	*
darran	0:55a05330f8cc	13	* Redistribution and use in source and binary forms, with or without modification,
darran	0:55a05330f8cc	14	* are permitted provided that the following conditions are met:
darran	0:55a05330f8cc	15	*
darran	0:55a05330f8cc	16	* 1. Redistributions of source code must retain the above copyright notice,
darran	0:55a05330f8cc	17	* this list of conditions and the following disclaimer.
darran	0:55a05330f8cc	18	* 2. Redistributions in binary form must reproduce the above copyright notice,
darran	0:55a05330f8cc	19	* this list of conditions and the following disclaimer in the documentation
darran	0:55a05330f8cc	20	* and/or other materials provided with the distribution.
darran	0:55a05330f8cc	21	* 3. The name of the author may not be used to endorse or promote products
darran	0:55a05330f8cc	22	* derived from this software without specific prior written permission.
darran	0:55a05330f8cc	23	*
darran	0:55a05330f8cc	24	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
darran	0:55a05330f8cc	25	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
darran	0:55a05330f8cc	26	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
darran	0:55a05330f8cc	27	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
darran	0:55a05330f8cc	28	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
darran	0:55a05330f8cc	29	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
darran	0:55a05330f8cc	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
darran	0:55a05330f8cc	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
darran	0:55a05330f8cc	32	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
darran	0:55a05330f8cc	33	* OF SUCH DAMAGE.
darran	0:55a05330f8cc	34	*
darran	0:55a05330f8cc	35	* This file is part of the lwIP TCP/IP stack.
darran	0:55a05330f8cc	36	*
darran	0:55a05330f8cc	37	* Author: Adam Dunkels <adam@sics.se>
darran	0:55a05330f8cc	38	*
darran	0:55a05330f8cc	39	*/
darran	0:55a05330f8cc	40
darran	0:55a05330f8cc	41	#include "lwip/opt.h"
darran	0:55a05330f8cc	42	#include "lwip/ip.h"
darran	0:55a05330f8cc	43	#include "lwip/def.h"
darran	0:55a05330f8cc	44	#include "lwip/mem.h"
darran	0:55a05330f8cc	45	#include "lwip/ip_frag.h"
darran	0:55a05330f8cc	46	#include "lwip/inet_chksum.h"
darran	0:55a05330f8cc	47	#include "lwip/netif.h"
darran	0:55a05330f8cc	48	#include "lwip/icmp.h"
darran	0:55a05330f8cc	49	#include "lwip/igmp.h"
darran	0:55a05330f8cc	50	#include "lwip/raw.h"
darran	0:55a05330f8cc	51	#include "lwip/udp.h"
darran	0:55a05330f8cc	52	#include "lwip/tcp_impl.h"
darran	0:55a05330f8cc	53	#include "lwip/snmp.h"
darran	0:55a05330f8cc	54	#include "lwip/dhcp.h"
darran	0:55a05330f8cc	55	#include "lwip/autoip.h"
darran	0:55a05330f8cc	56	#include "lwip/stats.h"
darran	0:55a05330f8cc	57	#include "arch/perf.h"
darran	0:55a05330f8cc	58
darran	0:55a05330f8cc	59	#include <string.h>
darran	0:55a05330f8cc	60
darran	0:55a05330f8cc	61	/**
darran	0:55a05330f8cc	62	* The interface that provided the packet for the current callback
darran	0:55a05330f8cc	63	* invocation.
darran	0:55a05330f8cc	64	*/
darran	0:55a05330f8cc	65	struct netif *current_netif;
darran	0:55a05330f8cc	66
darran	0:55a05330f8cc	67	/**
darran	0:55a05330f8cc	68	* Header of the input packet currently being processed.
darran	0:55a05330f8cc	69	*/
darran	0:55a05330f8cc	70	const struct ip_hdr *current_header;
darran	0:55a05330f8cc	71
darran	0:55a05330f8cc	72	/**
darran	0:55a05330f8cc	73	* Finds the appropriate network interface for a given IP address. It
darran	0:55a05330f8cc	74	* searches the list of network interfaces linearly. A match is found
darran	0:55a05330f8cc	75	* if the masked IP address of the network interface equals the masked
darran	0:55a05330f8cc	76	* IP address given to the function.
darran	0:55a05330f8cc	77	*
darran	0:55a05330f8cc	78	* @param dest the destination IP address for which to find the route
darran	0:55a05330f8cc	79	* @return the netif on which to send to reach dest
darran	0:55a05330f8cc	80	*/
darran	0:55a05330f8cc	81	struct netif *
darran	0:55a05330f8cc	82	ip_route(ip_addr_t *dest)
darran	0:55a05330f8cc	83	{
darran	0:55a05330f8cc	84	struct netif *netif;
darran	0:55a05330f8cc	85
darran	0:55a05330f8cc	86	/* iterate through netifs */
darran	0:55a05330f8cc	87	for(netif = netif_list; netif != NULL; netif = netif->next) {
darran	0:55a05330f8cc	88	/* network mask matches? */
darran	0:55a05330f8cc	89	if (netif_is_up(netif)) {
darran	0:55a05330f8cc	90	if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
darran	0:55a05330f8cc	91	/* return netif on which to forward IP packet */
darran	0:55a05330f8cc	92	return netif;
darran	0:55a05330f8cc	93	}
darran	0:55a05330f8cc	94	}
darran	0:55a05330f8cc	95	}
darran	0:55a05330f8cc	96	if ((netif_default == NULL) \|\| (!netif_is_up(netif_default))) {
darran	0:55a05330f8cc	97	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("ip_route: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
darran	0:55a05330f8cc	98	ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
darran	0:55a05330f8cc	99	IP_STATS_INC(ip.rterr);
darran	0:55a05330f8cc	100	snmp_inc_ipoutnoroutes();
darran	0:55a05330f8cc	101	return NULL;
darran	0:55a05330f8cc	102	}
darran	0:55a05330f8cc	103	/* no matching netif found, use default netif */
darran	0:55a05330f8cc	104	return netif_default;
darran	0:55a05330f8cc	105	}
darran	0:55a05330f8cc	106
darran	0:55a05330f8cc	107	#if IP_FORWARD
darran	0:55a05330f8cc	108	/**
darran	0:55a05330f8cc	109	* Forwards an IP packet. It finds an appropriate route for the
darran	0:55a05330f8cc	110	* packet, decrements the TTL value of the packet, adjusts the
darran	0:55a05330f8cc	111	* checksum and outputs the packet on the appropriate interface.
darran	0:55a05330f8cc	112	*
darran	0:55a05330f8cc	113	* @param p the packet to forward (p->payload points to IP header)
darran	0:55a05330f8cc	114	* @param iphdr the IP header of the input packet
darran	0:55a05330f8cc	115	* @param inp the netif on which this packet was received
darran	0:55a05330f8cc	116	* @return the netif on which the packet was sent (NULL if it wasn't sent)
darran	0:55a05330f8cc	117	*/
darran	0:55a05330f8cc	118	static struct netif *
darran	0:55a05330f8cc	119	ip_forward(struct pbuf p, struct ip_hdr iphdr, struct netif *inp)
darran	0:55a05330f8cc	120	{
darran	0:55a05330f8cc	121	struct netif *netif;
darran	0:55a05330f8cc	122	ip_addr_t dest;
darran	0:55a05330f8cc	123
darran	0:55a05330f8cc	124	PERF_START;
darran	0:55a05330f8cc	125	dest = iphdr->dest;
darran	0:55a05330f8cc	126
darran	0:55a05330f8cc	127	/* RFC3927 2.7: do not forward link-local addresses */
darran	0:55a05330f8cc	128	if (ip_addr_islinklocal(&dest)) {
darran	0:55a05330f8cc	129	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not forwarding LLA %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
darran	0:55a05330f8cc	130	ip4_addr1_16(&dest), ip4_addr2_16(&dest), ip4_addr3_16(&dest), ip4_addr4_16(&dest)));
darran	0:55a05330f8cc	131	snmp_inc_ipoutnoroutes();
darran	0:55a05330f8cc	132	return (struct netif *)NULL;
darran	0:55a05330f8cc	133	}
darran	0:55a05330f8cc	134
darran	0:55a05330f8cc	135	/* Find network interface where to forward this IP packet to. */
darran	0:55a05330f8cc	136	netif = ip_route(&dest);
darran	0:55a05330f8cc	137	if (netif == NULL) {
darran	0:55a05330f8cc	138	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
darran	0:55a05330f8cc	139	ip4_addr1_16(&dest), ip4_addr2_16(&dest), ip4_addr3_16(&dest), ip4_addr4_16(&dest)));
darran	0:55a05330f8cc	140	snmp_inc_ipoutnoroutes();
darran	0:55a05330f8cc	141	return (struct netif *)NULL;
darran	0:55a05330f8cc	142	}
darran	0:55a05330f8cc	143	/* Do not forward packets onto the same network interface on which
darran	0:55a05330f8cc	144	* they arrived. */
darran	0:55a05330f8cc	145	if (netif == inp) {
darran	0:55a05330f8cc	146	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
darran	0:55a05330f8cc	147	snmp_inc_ipoutnoroutes();
darran	0:55a05330f8cc	148	return (struct netif *)NULL;
darran	0:55a05330f8cc	149	}
darran	0:55a05330f8cc	150
darran	0:55a05330f8cc	151	/* decrement TTL */
darran	0:55a05330f8cc	152	IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
darran	0:55a05330f8cc	153	/* send ICMP if TTL == 0 */
darran	0:55a05330f8cc	154	if (IPH_TTL(iphdr) == 0) {
darran	0:55a05330f8cc	155	snmp_inc_ipinhdrerrors();
darran	0:55a05330f8cc	156	#if LWIP_ICMP
darran	0:55a05330f8cc	157	/* Don't send ICMP messages in response to ICMP messages */
darran	0:55a05330f8cc	158	if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
darran	0:55a05330f8cc	159	icmp_time_exceeded(p, ICMP_TE_TTL);
darran	0:55a05330f8cc	160	}
darran	0:55a05330f8cc	161	#endif /* LWIP_ICMP */
darran	0:55a05330f8cc	162	return (struct netif *)NULL;
darran	0:55a05330f8cc	163	}
darran	0:55a05330f8cc	164
darran	0:55a05330f8cc	165	/* Incrementally update the IP checksum. */
darran	0:55a05330f8cc	166	if (IPH_CHKSUM(iphdr) >= htons(0xffff - 0x100)) {
darran	0:55a05330f8cc	167	IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100) + 1);
darran	0:55a05330f8cc	168	} else {
darran	0:55a05330f8cc	169	IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100));
darran	0:55a05330f8cc	170	}
darran	0:55a05330f8cc	171
darran	0:55a05330f8cc	172	LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
darran	0:55a05330f8cc	173	ip4_addr1_16(&dest), ip4_addr2_16(&dest), ip4_addr3_16(&dest), ip4_addr4_16(&dest)));
darran	0:55a05330f8cc	174
darran	0:55a05330f8cc	175	IP_STATS_INC(ip.fw);
darran	0:55a05330f8cc	176	IP_STATS_INC(ip.xmit);
darran	0:55a05330f8cc	177	snmp_inc_ipforwdatagrams();
darran	0:55a05330f8cc	178
darran	0:55a05330f8cc	179	PERF_STOP("ip_forward");
darran	0:55a05330f8cc	180	/* transmit pbuf on chosen interface */
darran	0:55a05330f8cc	181	netif->output(netif, p, &dest);
darran	0:55a05330f8cc	182	return netif;
darran	0:55a05330f8cc	183	}
darran	0:55a05330f8cc	184	#endif /* IP_FORWARD */
darran	0:55a05330f8cc	185
darran	0:55a05330f8cc	186	/**
darran	0:55a05330f8cc	187	* This function is called by the network interface device driver when
darran	0:55a05330f8cc	188	* an IP packet is received. The function does the basic checks of the
darran	0:55a05330f8cc	189	* IP header such as packet size being at least larger than the header
darran	0:55a05330f8cc	190	* size etc. If the packet was not destined for us, the packet is
darran	0:55a05330f8cc	191	* forwarded (using ip_forward). The IP checksum is always checked.
darran	0:55a05330f8cc	192	*
darran	0:55a05330f8cc	193	* Finally, the packet is sent to the upper layer protocol input function.
darran	0:55a05330f8cc	194	*
darran	0:55a05330f8cc	195	* @param p the received IP packet (p->payload points to IP header)
darran	0:55a05330f8cc	196	* @param inp the netif on which this packet was received
darran	0:55a05330f8cc	197	* @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
darran	0:55a05330f8cc	198	* processed, but currently always returns ERR_OK)
darran	0:55a05330f8cc	199	*/
darran	0:55a05330f8cc	200	err_t
darran	0:55a05330f8cc	201	ip_input(struct pbuf p, struct netif inp)
darran	0:55a05330f8cc	202	{
darran	0:55a05330f8cc	203	struct ip_hdr *iphdr;
darran	0:55a05330f8cc	204	struct netif *netif;
darran	0:55a05330f8cc	205	u16_t iphdr_hlen;
darran	0:55a05330f8cc	206	u16_t iphdr_len;
darran	0:55a05330f8cc	207	#if LWIP_DHCP
darran	0:55a05330f8cc	208	int check_ip_src=1;
darran	0:55a05330f8cc	209	#endif /* LWIP_DHCP */
darran	0:55a05330f8cc	210
darran	0:55a05330f8cc	211	IP_STATS_INC(ip.recv);
darran	0:55a05330f8cc	212	snmp_inc_ipinreceives();
darran	0:55a05330f8cc	213
darran	0:55a05330f8cc	214	/* identify the IP header */
darran	0:55a05330f8cc	215	iphdr = (struct ip_hdr *)p->payload;
darran	0:55a05330f8cc	216	if (IPH_V(iphdr) != 4) {
darran	0:55a05330f8cc	217	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
darran	0:55a05330f8cc	218	ip_debug_print(p);
darran	0:55a05330f8cc	219	pbuf_free(p);
darran	0:55a05330f8cc	220	IP_STATS_INC(ip.err);
darran	0:55a05330f8cc	221	IP_STATS_INC(ip.drop);
darran	0:55a05330f8cc	222	snmp_inc_ipinhdrerrors();
darran	0:55a05330f8cc	223	return ERR_OK;
darran	0:55a05330f8cc	224	}
darran	0:55a05330f8cc	225
darran	0:55a05330f8cc	226	/* obtain IP header length in number of 32-bit words */
darran	0:55a05330f8cc	227	iphdr_hlen = IPH_HL(iphdr);
darran	0:55a05330f8cc	228	/* calculate IP header length in bytes */
darran	0:55a05330f8cc	229	iphdr_hlen *= 4;
darran	0:55a05330f8cc	230	/* obtain ip length in bytes */
darran	0:55a05330f8cc	231	iphdr_len = ntohs(IPH_LEN(iphdr));
darran	0:55a05330f8cc	232
darran	0:55a05330f8cc	233	/* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
darran	0:55a05330f8cc	234	if ((iphdr_hlen > p->len) \|\| (iphdr_len > p->tot_len)) {
darran	0:55a05330f8cc	235	if (iphdr_hlen > p->len) {
darran	0:55a05330f8cc	236	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:55a05330f8cc	237	("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
darran	0:55a05330f8cc	238	iphdr_hlen, p->len));
darran	0:55a05330f8cc	239	}
darran	0:55a05330f8cc	240	if (iphdr_len > p->tot_len) {
darran	0:55a05330f8cc	241	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:55a05330f8cc	242	("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
darran	0:55a05330f8cc	243	iphdr_len, p->tot_len));
darran	0:55a05330f8cc	244	}
darran	0:55a05330f8cc	245	/* free (drop) packet pbufs */
darran	0:55a05330f8cc	246	pbuf_free(p);
darran	0:55a05330f8cc	247	IP_STATS_INC(ip.lenerr);
darran	0:55a05330f8cc	248	IP_STATS_INC(ip.drop);
darran	0:55a05330f8cc	249	snmp_inc_ipindiscards();
darran	0:55a05330f8cc	250	return ERR_OK;
darran	0:55a05330f8cc	251	}
darran	0:55a05330f8cc	252
darran	0:55a05330f8cc	253	/* verify checksum */
darran	0:55a05330f8cc	254	#if CHECKSUM_CHECK_IP
darran	0:55a05330f8cc	255	if (inet_chksum(iphdr, iphdr_hlen) != 0) {
darran	0:55a05330f8cc	256
darran	0:55a05330f8cc	257	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:55a05330f8cc	258	("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
darran	0:55a05330f8cc	259	ip_debug_print(p);
darran	0:55a05330f8cc	260	pbuf_free(p);
darran	0:55a05330f8cc	261	IP_STATS_INC(ip.chkerr);
darran	0:55a05330f8cc	262	IP_STATS_INC(ip.drop);
darran	0:55a05330f8cc	263	snmp_inc_ipinhdrerrors();
darran	0:55a05330f8cc	264	return ERR_OK;
darran	0:55a05330f8cc	265	}
darran	0:55a05330f8cc	266	#endif
darran	0:55a05330f8cc	267
darran	0:55a05330f8cc	268	/* Trim pbuf. This should have been done at the netif layer,
darran	0:55a05330f8cc	269	* but we'll do it anyway just to be sure that its done. */
darran	0:55a05330f8cc	270	pbuf_realloc(p, iphdr_len);
darran	0:55a05330f8cc	271
darran	0:55a05330f8cc	272	/* match packet against an interface, i.e. is this packet for us? */
darran	0:55a05330f8cc	273	#if LWIP_IGMP
darran	0:55a05330f8cc	274	if (ip_addr_ismulticast(&(iphdr->dest))) {
darran	0:55a05330f8cc	275	if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &(iphdr->dest)))) {
darran	0:55a05330f8cc	276	netif = inp;
darran	0:55a05330f8cc	277	} else {
darran	0:55a05330f8cc	278	netif = NULL;
darran	0:55a05330f8cc	279	}
darran	0:55a05330f8cc	280	} else
darran	0:55a05330f8cc	281	#endif /* LWIP_IGMP */
darran	0:55a05330f8cc	282	{
darran	0:55a05330f8cc	283	/* start trying with inp. if that's not acceptable, start walking the
darran	0:55a05330f8cc	284	list of configured netifs.
darran	0:55a05330f8cc	285	'first' is used as a boolean to mark whether we started walking the list */
darran	0:55a05330f8cc	286	int first = 1;
darran	0:55a05330f8cc	287	netif = inp;
darran	0:55a05330f8cc	288	do {
darran	0:55a05330f8cc	289	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",
darran	0:55a05330f8cc	290	ip4_addr_get_u32(&iphdr->dest), ip4_addr_get_u32(&netif->ip_addr),
darran	0:55a05330f8cc	291	ip4_addr_get_u32(&iphdr->dest) & ip4_addr_get_u32(&netif->netmask),
darran	0:55a05330f8cc	292	ip4_addr_get_u32(&netif->ip_addr) & ip4_addr_get_u32(&netif->netmask),
darran	0:55a05330f8cc	293	ip4_addr_get_u32(&iphdr->dest) & ~ip4_addr_get_u32(&netif->netmask)));
darran	0:55a05330f8cc	294
darran	0:55a05330f8cc	295	/* interface is up and configured? */
darran	0:55a05330f8cc	296	if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
darran	0:55a05330f8cc	297	/* unicast to this interface address? */
darran	0:55a05330f8cc	298	if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) \|\|
darran	0:55a05330f8cc	299	/* or broadcast on this interface network address? */
darran	0:55a05330f8cc	300	ip_addr_isbroadcast(&(iphdr->dest), netif)) {
darran	0:55a05330f8cc	301	LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
darran	0:55a05330f8cc	302	netif->name[0], netif->name[1]));
darran	0:55a05330f8cc	303	/* break out of for loop */
darran	0:55a05330f8cc	304	break;
darran	0:55a05330f8cc	305	}
darran	0:55a05330f8cc	306	#if LWIP_AUTOIP
darran	0:55a05330f8cc	307	/* connections to link-local addresses must persist after changing
darran	0:55a05330f8cc	308	the netif's address (RFC3927 ch. 1.9) */
darran	0:55a05330f8cc	309	if ((netif->autoip != NULL) &&
darran	0:55a05330f8cc	310	ip_addr_cmp(&(iphdr->dest), &(netif->autoip->llipaddr))) {
darran	0:55a05330f8cc	311	LWIP_DEBUGF(IP_DEBUG, ("ip_input: LLA packet accepted on interface %c%c\n",
darran	0:55a05330f8cc	312	netif->name[0], netif->name[1]));
darran	0:55a05330f8cc	313	/* break out of for loop */
darran	0:55a05330f8cc	314	break;
darran	0:55a05330f8cc	315	}
darran	0:55a05330f8cc	316	#endif /* LWIP_AUTOIP */
darran	0:55a05330f8cc	317	}
darran	0:55a05330f8cc	318	if (first) {
darran	0:55a05330f8cc	319	first = 0;
darran	0:55a05330f8cc	320	netif = netif_list;
darran	0:55a05330f8cc	321	} else {
darran	0:55a05330f8cc	322	netif = netif->next;
darran	0:55a05330f8cc	323	}
darran	0:55a05330f8cc	324	if (netif == inp) {
darran	0:55a05330f8cc	325	netif = netif->next;
darran	0:55a05330f8cc	326	}
darran	0:55a05330f8cc	327	} while(netif != NULL);
darran	0:55a05330f8cc	328	}
darran	0:55a05330f8cc	329
darran	0:55a05330f8cc	330	#if LWIP_DHCP
darran	0:55a05330f8cc	331	/* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
darran	0:55a05330f8cc	332	* using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
darran	0:55a05330f8cc	333	* According to RFC 1542 section 3.1.1, referred by RFC 2131).
darran	0:55a05330f8cc	334	*/
darran	0:55a05330f8cc	335	if (netif == NULL) {
darran	0:55a05330f8cc	336	/* remote port is DHCP server? */
darran	0:55a05330f8cc	337	if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
darran	0:55a05330f8cc	338	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
darran	0:55a05330f8cc	339	ntohs(((struct udp_hdr )((u8_t )iphdr + iphdr_hlen))->dest)));
darran	0:55a05330f8cc	340	if (ntohs(((struct udp_hdr )((u8_t )iphdr + iphdr_hlen))->dest) == DHCP_CLIENT_PORT) {
darran	0:55a05330f8cc	341	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE, ("ip_input: DHCP packet accepted.\n"));
darran	0:55a05330f8cc	342	netif = inp;
darran	0:55a05330f8cc	343	check_ip_src = 0;
darran	0:55a05330f8cc	344	}
darran	0:55a05330f8cc	345	}
darran	0:55a05330f8cc	346	}
darran	0:55a05330f8cc	347	#endif /* LWIP_DHCP */
darran	0:55a05330f8cc	348
darran	0:55a05330f8cc	349	/* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
darran	0:55a05330f8cc	350	#if LWIP_DHCP
darran	0:55a05330f8cc	351	/* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
darran	0:55a05330f8cc	352	if (check_ip_src && !ip_addr_isany(&iphdr->src))
darran	0:55a05330f8cc	353	#endif /* LWIP_DHCP */
darran	0:55a05330f8cc	354	{ if ((ip_addr_isbroadcast(&(iphdr->src), inp)) \|\|
darran	0:55a05330f8cc	355	(ip_addr_ismulticast(&(iphdr->src)))) {
darran	0:55a05330f8cc	356	/* packet source is not valid */
darran	0:55a05330f8cc	357	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_WARNING, ("ip_input: packet source is not valid.\n"));
darran	0:55a05330f8cc	358	/* free (drop) packet pbufs */
darran	0:55a05330f8cc	359	pbuf_free(p);
darran	0:55a05330f8cc	360	IP_STATS_INC(ip.drop);
darran	0:55a05330f8cc	361	snmp_inc_ipinaddrerrors();
darran	0:55a05330f8cc	362	snmp_inc_ipindiscards();
darran	0:55a05330f8cc	363	return ERR_OK;
darran	0:55a05330f8cc	364	}
darran	0:55a05330f8cc	365	}
darran	0:55a05330f8cc	366
darran	0:55a05330f8cc	367	/* packet not for us? */
darran	0:55a05330f8cc	368	if (netif == NULL) {
darran	0:55a05330f8cc	369	/* packet not for us, route or discard */
darran	0:55a05330f8cc	370	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_TRACE, ("ip_input: packet not for us.\n"));
darran	0:55a05330f8cc	371	#if IP_FORWARD
darran	0:55a05330f8cc	372	/* non-broadcast packet? */
darran	0:55a05330f8cc	373	if (!ip_addr_isbroadcast(&(iphdr->dest), inp)) {
darran	0:55a05330f8cc	374	/* try to forward IP packet on (other) interfaces */
darran	0:55a05330f8cc	375	ip_forward(p, iphdr, inp);
darran	0:55a05330f8cc	376	} else
darran	0:55a05330f8cc	377	#endif /* IP_FORWARD */
darran	0:55a05330f8cc	378	{
darran	0:55a05330f8cc	379	snmp_inc_ipinaddrerrors();
darran	0:55a05330f8cc	380	snmp_inc_ipindiscards();
darran	0:55a05330f8cc	381	}
darran	0:55a05330f8cc	382	pbuf_free(p);
darran	0:55a05330f8cc	383	return ERR_OK;
darran	0:55a05330f8cc	384	}
darran	0:55a05330f8cc	385	/* packet consists of multiple fragments? */
darran	0:55a05330f8cc	386	if ((IPH_OFFSET(iphdr) & htons(IP_OFFMASK \| IP_MF)) != 0) {
darran	0:55a05330f8cc	387	#if IP_REASSEMBLY /* packet fragment reassembly code present? */
darran	0:55a05330f8cc	388	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",
darran	0:55a05330f8cc	389	ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & htons(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)*8));
darran	0:55a05330f8cc	390	/* reassemble the packet*/
darran	0:55a05330f8cc	391	p = ip_reass(p);
darran	0:55a05330f8cc	392	/* packet not fully reassembled yet? */
darran	0:55a05330f8cc	393	if (p == NULL) {
darran	0:55a05330f8cc	394	return ERR_OK;
darran	0:55a05330f8cc	395	}
darran	0:55a05330f8cc	396	iphdr = (struct ip_hdr *)p->payload;
darran	0:55a05330f8cc	397	#else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
darran	0:55a05330f8cc	398	pbuf_free(p);
darran	0:55a05330f8cc	399	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
darran	0:55a05330f8cc	400	ntohs(IPH_OFFSET(iphdr))));
darran	0:55a05330f8cc	401	IP_STATS_INC(ip.opterr);
darran	0:55a05330f8cc	402	IP_STATS_INC(ip.drop);
darran	0:55a05330f8cc	403	/* unsupported protocol feature */
darran	0:55a05330f8cc	404	snmp_inc_ipinunknownprotos();
darran	0:55a05330f8cc	405	return ERR_OK;
darran	0:55a05330f8cc	406	#endif /* IP_REASSEMBLY */
darran	0:55a05330f8cc	407	}
darran	0:55a05330f8cc	408
darran	0:55a05330f8cc	409	#if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
darran	0:55a05330f8cc	410
darran	0:55a05330f8cc	411	#if LWIP_IGMP
darran	0:55a05330f8cc	412	/* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
darran	0:55a05330f8cc	413	if((iphdr_hlen > IP_HLEN) && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
darran	0:55a05330f8cc	414	#else
darran	0:55a05330f8cc	415	if (iphdr_hlen > IP_HLEN) {
darran	0:55a05330f8cc	416	#endif /* LWIP_IGMP */
darran	0:55a05330f8cc	417	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
darran	0:55a05330f8cc	418	pbuf_free(p);
darran	0:55a05330f8cc	419	IP_STATS_INC(ip.opterr);
darran	0:55a05330f8cc	420	IP_STATS_INC(ip.drop);
darran	0:55a05330f8cc	421	/* unsupported protocol feature */
darran	0:55a05330f8cc	422	snmp_inc_ipinunknownprotos();
darran	0:55a05330f8cc	423	return ERR_OK;
darran	0:55a05330f8cc	424	}
darran	0:55a05330f8cc	425	#endif /* IP_OPTIONS_ALLOWED == 0 */
darran	0:55a05330f8cc	426
darran	0:55a05330f8cc	427	/* send to upper layers */
darran	0:55a05330f8cc	428	LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
darran	0:55a05330f8cc	429	ip_debug_print(p);
darran	0:55a05330f8cc	430	LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
darran	0:55a05330f8cc	431
darran	0:55a05330f8cc	432	current_netif = inp;
darran	0:55a05330f8cc	433	current_header = iphdr;
darran	0:55a05330f8cc	434
darran	0:55a05330f8cc	435	#if LWIP_RAW
darran	0:55a05330f8cc	436	/* raw input did not eat the packet? */
darran	0:55a05330f8cc	437	if (raw_input(p, inp) == 0)
darran	0:55a05330f8cc	438	#endif /* LWIP_RAW */
darran	0:55a05330f8cc	439	{
darran	0:55a05330f8cc	440
darran	0:55a05330f8cc	441	switch (IPH_PROTO(iphdr)) {
darran	0:55a05330f8cc	442	#if LWIP_UDP
darran	0:55a05330f8cc	443	case IP_PROTO_UDP:
darran	0:55a05330f8cc	444	#if LWIP_UDPLITE
darran	0:55a05330f8cc	445	case IP_PROTO_UDPLITE:
darran	0:55a05330f8cc	446	#endif /* LWIP_UDPLITE */
darran	0:55a05330f8cc	447	snmp_inc_ipindelivers();
darran	0:55a05330f8cc	448	udp_input(p, inp);
darran	0:55a05330f8cc	449	break;
darran	0:55a05330f8cc	450	#endif /* LWIP_UDP */
darran	0:55a05330f8cc	451	#if LWIP_TCP
darran	0:55a05330f8cc	452	case IP_PROTO_TCP:
darran	0:55a05330f8cc	453	snmp_inc_ipindelivers();
darran	0:55a05330f8cc	454	tcp_input(p, inp);
darran	0:55a05330f8cc	455	break;
darran	0:55a05330f8cc	456	#endif /* LWIP_TCP */
darran	0:55a05330f8cc	457	#if LWIP_ICMP
darran	0:55a05330f8cc	458	case IP_PROTO_ICMP:
darran	0:55a05330f8cc	459	snmp_inc_ipindelivers();
darran	0:55a05330f8cc	460	icmp_input(p, inp);
darran	0:55a05330f8cc	461	break;
darran	0:55a05330f8cc	462	#endif /* LWIP_ICMP */
darran	0:55a05330f8cc	463	#if LWIP_IGMP
darran	0:55a05330f8cc	464	case IP_PROTO_IGMP:
darran	0:55a05330f8cc	465	igmp_input(p,inp,&(iphdr->dest));
darran	0:55a05330f8cc	466	break;
darran	0:55a05330f8cc	467	#endif /* LWIP_IGMP */
darran	0:55a05330f8cc	468	default:
darran	0:55a05330f8cc	469	#if LWIP_ICMP
darran	0:55a05330f8cc	470	/* send ICMP destination protocol unreachable unless is was a broadcast */
darran	0:55a05330f8cc	471	if (!ip_addr_isbroadcast(&(iphdr->dest), inp) &&
darran	0:55a05330f8cc	472	!ip_addr_ismulticast(&(iphdr->dest))) {
darran	0:55a05330f8cc	473	p->payload = iphdr;
darran	0:55a05330f8cc	474	icmp_dest_unreach(p, ICMP_DUR_PROTO);
darran	0:55a05330f8cc	475	}
darran	0:55a05330f8cc	476	#endif /* LWIP_ICMP */
darran	0:55a05330f8cc	477	pbuf_free(p);
darran	0:55a05330f8cc	478
darran	0:55a05330f8cc	479	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
darran	0:55a05330f8cc	480
darran	0:55a05330f8cc	481	IP_STATS_INC(ip.proterr);
darran	0:55a05330f8cc	482	IP_STATS_INC(ip.drop);
darran	0:55a05330f8cc	483	snmp_inc_ipinunknownprotos();
darran	0:55a05330f8cc	484	}
darran	0:55a05330f8cc	485	}
darran	0:55a05330f8cc	486
darran	0:55a05330f8cc	487	current_netif = NULL;
darran	0:55a05330f8cc	488	current_header = NULL;
darran	0:55a05330f8cc	489
darran	0:55a05330f8cc	490	return ERR_OK;
darran	0:55a05330f8cc	491	}
darran	0:55a05330f8cc	492
darran	0:55a05330f8cc	493	/**
darran	0:55a05330f8cc	494	* Sends an IP packet on a network interface. This function constructs
darran	0:55a05330f8cc	495	* the IP header and calculates the IP header checksum. If the source
darran	0:55a05330f8cc	496	* IP address is NULL, the IP address of the outgoing network
darran	0:55a05330f8cc	497	* interface is filled in as source address.
darran	0:55a05330f8cc	498	* If the destination IP address is IP_HDRINCL, p is assumed to already
darran	0:55a05330f8cc	499	* include an IP header and p->payload points to it instead of the data.
darran	0:55a05330f8cc	500	*
darran	0:55a05330f8cc	501	* @param p the packet to send (p->payload points to the data, e.g. next
darran	0:55a05330f8cc	502	protocol header; if dest == IP_HDRINCL, p already includes an IP
darran	0:55a05330f8cc	503	header and p->payload points to that IP header)
darran	0:55a05330f8cc	504	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
darran	0:55a05330f8cc	505	* IP address of the netif used to send is used as source address)
darran	0:55a05330f8cc	506	* @param dest the destination IP address to send the packet to
darran	0:55a05330f8cc	507	* @param ttl the TTL value to be set in the IP header
darran	0:55a05330f8cc	508	* @param tos the TOS value to be set in the IP header
darran	0:55a05330f8cc	509	* @param proto the PROTOCOL to be set in the IP header
darran	0:55a05330f8cc	510	* @param netif the netif on which to send this packet
darran	0:55a05330f8cc	511	* @return ERR_OK if the packet was sent OK
darran	0:55a05330f8cc	512	* ERR_BUF if p doesn't have enough space for IP/LINK headers
darran	0:55a05330f8cc	513	* returns errors returned by netif->output
darran	0:55a05330f8cc	514	*
darran	0:55a05330f8cc	515	* @note ip_id: RFC791 "some host may be able to simply use
darran	0:55a05330f8cc	516	* unique identifiers independent of destination"
darran	0:55a05330f8cc	517	*/
darran	0:55a05330f8cc	518	err_t
darran	0:55a05330f8cc	519	ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
darran	0:55a05330f8cc	520	u8_t ttl, u8_t tos,
darran	0:55a05330f8cc	521	u8_t proto, struct netif *netif)
darran	0:55a05330f8cc	522	{
darran	0:55a05330f8cc	523	#if IP_OPTIONS_SEND
darran	0:55a05330f8cc	524	return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
darran	0:55a05330f8cc	525	}
darran	0:55a05330f8cc	526
darran	0:55a05330f8cc	527	/**
darran	0:55a05330f8cc	528	* Same as ip_output_if() but with the possibility to include IP options:
darran	0:55a05330f8cc	529	*
darran	0:55a05330f8cc	530	* @ param ip_options pointer to the IP options, copied into the IP header
darran	0:55a05330f8cc	531	* @ param optlen length of ip_options
darran	0:55a05330f8cc	532	*/
darran	0:55a05330f8cc	533	err_t ip_output_if_opt(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
darran	0:55a05330f8cc	534	u8_t ttl, u8_t tos, u8_t proto, struct netif netif, void ip_options,
darran	0:55a05330f8cc	535	u16_t optlen)
darran	0:55a05330f8cc	536	{
darran	0:55a05330f8cc	537	#endif /* IP_OPTIONS_SEND */
darran	0:55a05330f8cc	538	struct ip_hdr *iphdr;
darran	0:55a05330f8cc	539	static u16_t ip_id = 0;
darran	0:55a05330f8cc	540
darran	0:55a05330f8cc	541	/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
darran	0:55a05330f8cc	542	gets altered as the packet is passed down the stack */
darran	0:55a05330f8cc	543	LWIP_ASSERT("p->ref == 1", p->ref == 1);
darran	0:55a05330f8cc	544
darran	0:55a05330f8cc	545	snmp_inc_ipoutrequests();
darran	0:55a05330f8cc	546
darran	0:55a05330f8cc	547	/* Should the IP header be generated or is it already included in p? */
darran	0:55a05330f8cc	548	if (dest != IP_HDRINCL) {
darran	0:55a05330f8cc	549	u16_t ip_hlen = IP_HLEN;
darran	0:55a05330f8cc	550	#if IP_OPTIONS_SEND
darran	0:55a05330f8cc	551	u16_t optlen_aligned = 0;
darran	0:55a05330f8cc	552	if (optlen != 0) {
darran	0:55a05330f8cc	553	/* round up to a multiple of 4 */
darran	0:55a05330f8cc	554	optlen_aligned = ((optlen + 3) & ~3);
darran	0:55a05330f8cc	555	ip_hlen += optlen_aligned;
darran	0:55a05330f8cc	556	/* First write in the IP options */
darran	0:55a05330f8cc	557	if (pbuf_header(p, optlen_aligned)) {
darran	0:55a05330f8cc	558	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
darran	0:55a05330f8cc	559	IP_STATS_INC(ip.err);
darran	0:55a05330f8cc	560	snmp_inc_ipoutdiscards();
darran	0:55a05330f8cc	561	return ERR_BUF;
darran	0:55a05330f8cc	562	}
darran	0:55a05330f8cc	563	MEMCPY(p->payload, ip_options, optlen);
darran	0:55a05330f8cc	564	if (optlen < optlen_aligned) {
darran	0:55a05330f8cc	565	/* zero the remaining bytes */
darran	0:55a05330f8cc	566	memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
darran	0:55a05330f8cc	567	}
darran	0:55a05330f8cc	568	}
darran	0:55a05330f8cc	569	#endif /* IP_OPTIONS_SEND */
darran	0:55a05330f8cc	570	/* generate IP header */
darran	0:55a05330f8cc	571	if (pbuf_header(p, IP_HLEN)) {
darran	0:55a05330f8cc	572	LWIP_DEBUGF(IP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("ip_output: not enough room for IP header in pbuf\n"));
darran	0:55a05330f8cc	573
darran	0:55a05330f8cc	574	IP_STATS_INC(ip.err);
darran	0:55a05330f8cc	575	snmp_inc_ipoutdiscards();
darran	0:55a05330f8cc	576	return ERR_BUF;
darran	0:55a05330f8cc	577	}
darran	0:55a05330f8cc	578
darran	0:55a05330f8cc	579	iphdr = (struct ip_hdr *)p->payload;
darran	0:55a05330f8cc	580	LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
darran	0:55a05330f8cc	581	(p->len >= sizeof(struct ip_hdr)));
darran	0:55a05330f8cc	582
darran	0:55a05330f8cc	583	IPH_TTL_SET(iphdr, ttl);
darran	0:55a05330f8cc	584	IPH_PROTO_SET(iphdr, proto);
darran	0:55a05330f8cc	585
darran	0:55a05330f8cc	586	/* dest cannot be NULL here */
darran	0:55a05330f8cc	587	ip_addr_copy(iphdr->dest, *dest);
darran	0:55a05330f8cc	588
darran	0:55a05330f8cc	589	IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
darran	0:55a05330f8cc	590	IPH_LEN_SET(iphdr, htons(p->tot_len));
darran	0:55a05330f8cc	591	IPH_OFFSET_SET(iphdr, 0);
darran	0:55a05330f8cc	592	IPH_ID_SET(iphdr, htons(ip_id));
darran	0:55a05330f8cc	593	++ip_id;
darran	0:55a05330f8cc	594
darran	0:55a05330f8cc	595	if (ip_addr_isany(src)) {
darran	0:55a05330f8cc	596	ip_addr_copy(iphdr->src, netif->ip_addr);
darran	0:55a05330f8cc	597	} else {
darran	0:55a05330f8cc	598	/* src cannot be NULL here */
darran	0:55a05330f8cc	599	ip_addr_copy(iphdr->src, *src);
darran	0:55a05330f8cc	600	}
darran	0:55a05330f8cc	601
darran	0:55a05330f8cc	602	IPH_CHKSUM_SET(iphdr, 0);
darran	0:55a05330f8cc	603	#if CHECKSUM_GEN_IP
darran	0:55a05330f8cc	604	IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
darran	0:55a05330f8cc	605	#endif
darran	0:55a05330f8cc	606	} else {
darran	0:55a05330f8cc	607	/* IP header already included in p */
darran	0:55a05330f8cc	608	iphdr = (struct ip_hdr *)p->payload;
darran	0:55a05330f8cc	609	dest = &(iphdr->dest);
darran	0:55a05330f8cc	610	}
darran	0:55a05330f8cc	611
darran	0:55a05330f8cc	612	IP_STATS_INC(ip.xmit);
darran	0:55a05330f8cc	613
darran	0:55a05330f8cc	614	LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
darran	0:55a05330f8cc	615	ip_debug_print(p);
darran	0:55a05330f8cc	616
darran	0:55a05330f8cc	617	#if ENABLE_LOOPBACK
darran	0:55a05330f8cc	618	if (ip_addr_cmp(dest, &netif->ip_addr)) {
darran	0:55a05330f8cc	619	/* Packet to self, enqueue it for loopback */
darran	0:55a05330f8cc	620	LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
darran	0:55a05330f8cc	621	return netif_loop_output(netif, p, dest);
darran	0:55a05330f8cc	622	}
darran	0:55a05330f8cc	623	#endif /* ENABLE_LOOPBACK */
darran	0:55a05330f8cc	624	#if IP_FRAG
darran	0:55a05330f8cc	625	/* don't fragment if interface has mtu set to 0 [loopif] */
darran	0:55a05330f8cc	626	if (netif->mtu && (p->tot_len > netif->mtu)) {
darran	0:55a05330f8cc	627	return ip_frag(p,netif,dest);
darran	0:55a05330f8cc	628	}
darran	0:55a05330f8cc	629	#endif
darran	0:55a05330f8cc	630
darran	0:55a05330f8cc	631	LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
darran	0:55a05330f8cc	632	return netif->output(netif, p, dest);
darran	0:55a05330f8cc	633	}
darran	0:55a05330f8cc	634
darran	0:55a05330f8cc	635	/**
darran	0:55a05330f8cc	636	* Simple interface to ip_output_if. It finds the outgoing network
darran	0:55a05330f8cc	637	* interface and calls upon ip_output_if to do the actual work.
darran	0:55a05330f8cc	638	*
darran	0:55a05330f8cc	639	* @param p the packet to send (p->payload points to the data, e.g. next
darran	0:55a05330f8cc	640	protocol header; if dest == IP_HDRINCL, p already includes an IP
darran	0:55a05330f8cc	641	header and p->payload points to that IP header)
darran	0:55a05330f8cc	642	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
darran	0:55a05330f8cc	643	* IP address of the netif used to send is used as source address)
darran	0:55a05330f8cc	644	* @param dest the destination IP address to send the packet to
darran	0:55a05330f8cc	645	* @param ttl the TTL value to be set in the IP header
darran	0:55a05330f8cc	646	* @param tos the TOS value to be set in the IP header
darran	0:55a05330f8cc	647	* @param proto the PROTOCOL to be set in the IP header
darran	0:55a05330f8cc	648	*
darran	0:55a05330f8cc	649	* @return ERR_RTE if no route is found
darran	0:55a05330f8cc	650	* see ip_output_if() for more return values
darran	0:55a05330f8cc	651	*/
darran	0:55a05330f8cc	652	err_t
darran	0:55a05330f8cc	653	ip_output(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
darran	0:55a05330f8cc	654	u8_t ttl, u8_t tos, u8_t proto)
darran	0:55a05330f8cc	655	{
darran	0:55a05330f8cc	656	struct netif *netif;
darran	0:55a05330f8cc	657
darran	0:55a05330f8cc	658	/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
darran	0:55a05330f8cc	659	gets altered as the packet is passed down the stack */
darran	0:55a05330f8cc	660	LWIP_ASSERT("p->ref == 1", p->ref == 1);
darran	0:55a05330f8cc	661
darran	0:55a05330f8cc	662	if ((netif = ip_route(dest)) == NULL) {
darran	0:55a05330f8cc	663	LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
darran	0:55a05330f8cc	664	ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
darran	0:55a05330f8cc	665	IP_STATS_INC(ip.rterr);
darran	0:55a05330f8cc	666	return ERR_RTE;
darran	0:55a05330f8cc	667	}
darran	0:55a05330f8cc	668
darran	0:55a05330f8cc	669	return ip_output_if(p, src, dest, ttl, tos, proto, netif);
darran	0:55a05330f8cc	670	}
darran	0:55a05330f8cc	671
darran	0:55a05330f8cc	672	#if LWIP_NETIF_HWADDRHINT
darran	0:55a05330f8cc	673	/** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
darran	0:55a05330f8cc	674	* before calling ip_output_if.
darran	0:55a05330f8cc	675	*
darran	0:55a05330f8cc	676	* @param p the packet to send (p->payload points to the data, e.g. next
darran	0:55a05330f8cc	677	protocol header; if dest == IP_HDRINCL, p already includes an IP
darran	0:55a05330f8cc	678	header and p->payload points to that IP header)
darran	0:55a05330f8cc	679	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
darran	0:55a05330f8cc	680	* IP address of the netif used to send is used as source address)
darran	0:55a05330f8cc	681	* @param dest the destination IP address to send the packet to
darran	0:55a05330f8cc	682	* @param ttl the TTL value to be set in the IP header
darran	0:55a05330f8cc	683	* @param tos the TOS value to be set in the IP header
darran	0:55a05330f8cc	684	* @param proto the PROTOCOL to be set in the IP header
darran	0:55a05330f8cc	685	* @param addr_hint address hint pointer set to netif->addr_hint before
darran	0:55a05330f8cc	686	* calling ip_output_if()
darran	0:55a05330f8cc	687	*
darran	0:55a05330f8cc	688	* @return ERR_RTE if no route is found
darran	0:55a05330f8cc	689	* see ip_output_if() for more return values
darran	0:55a05330f8cc	690	*/
darran	0:55a05330f8cc	691	err_t
darran	0:55a05330f8cc	692	ip_output_hinted(struct pbuf p, ip_addr_t src, ip_addr_t *dest,
darran	0:55a05330f8cc	693	u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
darran	0:55a05330f8cc	694	{
darran	0:55a05330f8cc	695	struct netif *netif;
darran	0:55a05330f8cc	696	err_t err;
darran	0:55a05330f8cc	697
darran	0:55a05330f8cc	698	/* pbufs passed to IP must have a ref-count of 1 as their payload pointer
darran	0:55a05330f8cc	699	gets altered as the packet is passed down the stack */
darran	0:55a05330f8cc	700	LWIP_ASSERT("p->ref == 1", p->ref == 1);
darran	0:55a05330f8cc	701
darran	0:55a05330f8cc	702	if ((netif = ip_route(dest)) == NULL) {
darran	0:55a05330f8cc	703	LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
darran	0:55a05330f8cc	704	ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
darran	0:55a05330f8cc	705	IP_STATS_INC(ip.rterr);
darran	0:55a05330f8cc	706	return ERR_RTE;
darran	0:55a05330f8cc	707	}
darran	0:55a05330f8cc	708
darran	0:55a05330f8cc	709	netif->addr_hint = addr_hint;
darran	0:55a05330f8cc	710	err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
darran	0:55a05330f8cc	711	netif->addr_hint = NULL;
darran	0:55a05330f8cc	712
darran	0:55a05330f8cc	713	return err;
darran	0:55a05330f8cc	714	}
darran	0:55a05330f8cc	715	#endif /* LWIP_NETIF_HWADDRHINT*/
darran	0:55a05330f8cc	716
darran	0:55a05330f8cc	717	#if IP_DEBUG
darran	0:55a05330f8cc	718	/* Print an IP header by using LWIP_DEBUGF
darran	0:55a05330f8cc	719	* @param p an IP packet, p->payload pointing to the IP header
darran	0:55a05330f8cc	720	*/
darran	0:55a05330f8cc	721	void
darran	0:55a05330f8cc	722	ip_debug_print(struct pbuf *p)
darran	0:55a05330f8cc	723	{
darran	0:55a05330f8cc	724	struct ip_hdr iphdr = (struct ip_hdr ) p->payload;
darran	0:55a05330f8cc	725	u8_t *payload;
darran	0:55a05330f8cc	726
darran	0:55a05330f8cc	727	payload = (u8_t *)iphdr + IP_HLEN;
darran	0:55a05330f8cc	728
darran	0:55a05330f8cc	729	LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
darran	0:55a05330f8cc	730	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
darran	0:55a05330f8cc	731	LWIP_DEBUGF(IP_DEBUG, ("\|%2"S16_F" \|%2"S16_F" \| 0x%02"X16_F" \| %5"U16_F" \| (v, hl, tos, len)\n",
darran	0:55a05330f8cc	732	IPH_V(iphdr),
darran	0:55a05330f8cc	733	IPH_HL(iphdr),
darran	0:55a05330f8cc	734	IPH_TOS(iphdr),
darran	0:55a05330f8cc	735	ntohs(IPH_LEN(iphdr))));
darran	0:55a05330f8cc	736	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
darran	0:55a05330f8cc	737	LWIP_DEBUGF(IP_DEBUG, ("\| %5"U16_F" \|%"U16_F"%"U16_F"%"U16_F"\| %4"U16_F" \| (id, flags, offset)\n",
darran	0:55a05330f8cc	738	ntohs(IPH_ID(iphdr)),
darran	0:55a05330f8cc	739	ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
darran	0:55a05330f8cc	740	ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
darran	0:55a05330f8cc	741	ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
darran	0:55a05330f8cc	742	ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
darran	0:55a05330f8cc	743	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
darran	0:55a05330f8cc	744	LWIP_DEBUGF(IP_DEBUG, ("\| %3"U16_F" \| %3"U16_F" \| 0x%04"X16_F" \| (ttl, proto, chksum)\n",
darran	0:55a05330f8cc	745	IPH_TTL(iphdr),
darran	0:55a05330f8cc	746	IPH_PROTO(iphdr),
darran	0:55a05330f8cc	747	ntohs(IPH_CHKSUM(iphdr))));
darran	0:55a05330f8cc	748	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
darran	0:55a05330f8cc	749	LWIP_DEBUGF(IP_DEBUG, ("\| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| (src)\n",
darran	0:55a05330f8cc	750	ip4_addr1_16(&iphdr->src),
darran	0:55a05330f8cc	751	ip4_addr2_16(&iphdr->src),
darran	0:55a05330f8cc	752	ip4_addr3_16(&iphdr->src),
darran	0:55a05330f8cc	753	ip4_addr4_16(&iphdr->src)));
darran	0:55a05330f8cc	754	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
darran	0:55a05330f8cc	755	LWIP_DEBUGF(IP_DEBUG, ("\| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| %3"U16_F" \| (dest)\n",
darran	0:55a05330f8cc	756	ip4_addr1_16(&iphdr->dest),
darran	0:55a05330f8cc	757	ip4_addr2_16(&iphdr->dest),
darran	0:55a05330f8cc	758	ip4_addr3_16(&iphdr->dest),
darran	0:55a05330f8cc	759	ip4_addr4_16(&iphdr->dest)));
darran	0:55a05330f8cc	760	LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
darran	0:55a05330f8cc	761	}
darran	0:55a05330f8cc	762	#endif /* IP_DEBUG */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	18 Jun 2010
Imports:	7
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	1
Followers:	1

lwip/core/ipv4/ip.c@1:4218cacaf696, 2010-06-18 (annotated)

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