XBeeWiFi_common - EthernetNetIf Compatibility.

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EthernetNetIf Compatibility.

Dependents: XBeeWiFi_SPI_example

Fork of NetServicesSource by Donatien Garnier

lwip/core/udp.c@0:632c9925f013, 2010-06-11 (annotated)

Committer:: donatien
Date:: Fri Jun 11 16:05:15 2010 +0000
Revision:: 0:632c9925f013
Child:: 5:dd63a1e02b1b

Who changed what in which revision?

User	Revision	Line number	New contents of line
donatien	0:632c9925f013	1	/**
donatien	0:632c9925f013	2	* @file
donatien	0:632c9925f013	3	* User Datagram Protocol module
donatien	0:632c9925f013	4	*
donatien	0:632c9925f013	5	*/
donatien	0:632c9925f013	6
donatien	0:632c9925f013	7	/*
donatien	0:632c9925f013	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
donatien	0:632c9925f013	9	* All rights reserved.
donatien	0:632c9925f013	10	*
donatien	0:632c9925f013	11	* Redistribution and use in source and binary forms, with or without modification,
donatien	0:632c9925f013	12	* are permitted provided that the following conditions are met:
donatien	0:632c9925f013	13	*
donatien	0:632c9925f013	14	* 1. Redistributions of source code must retain the above copyright notice,
donatien	0:632c9925f013	15	* this list of conditions and the following disclaimer.
donatien	0:632c9925f013	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
donatien	0:632c9925f013	17	* this list of conditions and the following disclaimer in the documentation
donatien	0:632c9925f013	18	* and/or other materials provided with the distribution.
donatien	0:632c9925f013	19	* 3. The name of the author may not be used to endorse or promote products
donatien	0:632c9925f013	20	* derived from this software without specific prior written permission.
donatien	0:632c9925f013	21	*
donatien	0:632c9925f013	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
donatien	0:632c9925f013	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
donatien	0:632c9925f013	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
donatien	0:632c9925f013	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
donatien	0:632c9925f013	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
donatien	0:632c9925f013	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien	0:632c9925f013	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
donatien	0:632c9925f013	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
donatien	0:632c9925f013	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
donatien	0:632c9925f013	31	* OF SUCH DAMAGE.
donatien	0:632c9925f013	32	*
donatien	0:632c9925f013	33	* This file is part of the lwIP TCP/IP stack.
donatien	0:632c9925f013	34	*
donatien	0:632c9925f013	35	* Author: Adam Dunkels <adam@sics.se>
donatien	0:632c9925f013	36	*
donatien	0:632c9925f013	37	*/
donatien	0:632c9925f013	38
donatien	0:632c9925f013	39
donatien	0:632c9925f013	40	/* udp.c
donatien	0:632c9925f013	41	*
donatien	0:632c9925f013	42	* The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
donatien	0:632c9925f013	43	*
donatien	0:632c9925f013	44	*/
donatien	0:632c9925f013	45
donatien	0:632c9925f013	46	/* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
donatien	0:632c9925f013	47	*/
donatien	0:632c9925f013	48
donatien	0:632c9925f013	49	#include "lwip/opt.h"
donatien	0:632c9925f013	50
donatien	0:632c9925f013	51	#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
donatien	0:632c9925f013	52
donatien	0:632c9925f013	53	#include "lwip/udp.h"
donatien	0:632c9925f013	54	#include "lwip/def.h"
donatien	0:632c9925f013	55	#include "lwip/memp.h"
donatien	0:632c9925f013	56	#include "lwip/inet_chksum.h"
donatien	0:632c9925f013	57	#include "lwip/ip_addr.h"
donatien	0:632c9925f013	58	#include "lwip/netif.h"
donatien	0:632c9925f013	59	#include "lwip/icmp.h"
donatien	0:632c9925f013	60	#include "lwip/stats.h"
donatien	0:632c9925f013	61	#include "lwip/snmp.h"
donatien	0:632c9925f013	62	#include "arch/perf.h"
donatien	0:632c9925f013	63	#include "lwip/dhcp.h"
donatien	0:632c9925f013	64
donatien	0:632c9925f013	65	#include <string.h>
donatien	0:632c9925f013	66
donatien	0:632c9925f013	67	/* The list of UDP PCBs */
donatien	0:632c9925f013	68	/* exported in udp.h (was static) */
donatien	0:632c9925f013	69	struct udp_pcb *udp_pcbs;
donatien	0:632c9925f013	70
donatien	0:632c9925f013	71	/**
donatien	0:632c9925f013	72	* Process an incoming UDP datagram.
donatien	0:632c9925f013	73	*
donatien	0:632c9925f013	74	* Given an incoming UDP datagram (as a chain of pbufs) this function
donatien	0:632c9925f013	75	* finds a corresponding UDP PCB and hands over the pbuf to the pcbs
donatien	0:632c9925f013	76	* recv function. If no pcb is found or the datagram is incorrect, the
donatien	0:632c9925f013	77	* pbuf is freed.
donatien	0:632c9925f013	78	*
donatien	0:632c9925f013	79	* @param p pbuf to be demultiplexed to a UDP PCB.
donatien	0:632c9925f013	80	* @param inp network interface on which the datagram was received.
donatien	0:632c9925f013	81	*
donatien	0:632c9925f013	82	*/
donatien	0:632c9925f013	83	void
donatien	0:632c9925f013	84	udp_input(struct pbuf p, struct netif inp)
donatien	0:632c9925f013	85	{
donatien	0:632c9925f013	86	struct udp_hdr *udphdr;
donatien	0:632c9925f013	87	struct udp_pcb pcb, prev;
donatien	0:632c9925f013	88	struct udp_pcb *uncon_pcb;
donatien	0:632c9925f013	89	struct ip_hdr *iphdr;
donatien	0:632c9925f013	90	u16_t src, dest;
donatien	0:632c9925f013	91	u8_t local_match;
donatien	0:632c9925f013	92	u8_t broadcast;
donatien	0:632c9925f013	93
donatien	0:632c9925f013	94	PERF_START;
donatien	0:632c9925f013	95
donatien	0:632c9925f013	96	UDP_STATS_INC(udp.recv);
donatien	0:632c9925f013	97
donatien	0:632c9925f013	98	iphdr = (struct ip_hdr *)p->payload;
donatien	0:632c9925f013	99
donatien	0:632c9925f013	100	/* Check minimum length (IP header + UDP header)
donatien	0:632c9925f013	101	* and move payload pointer to UDP header */
donatien	0:632c9925f013	102	if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) \|\| pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
donatien	0:632c9925f013	103	/* drop short packets */
donatien	0:632c9925f013	104	LWIP_DEBUGF(UDP_DEBUG,
donatien	0:632c9925f013	105	("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
donatien	0:632c9925f013	106	UDP_STATS_INC(udp.lenerr);
donatien	0:632c9925f013	107	UDP_STATS_INC(udp.drop);
donatien	0:632c9925f013	108	snmp_inc_udpinerrors();
donatien	0:632c9925f013	109	pbuf_free(p);
donatien	0:632c9925f013	110	goto end;
donatien	0:632c9925f013	111	}
donatien	0:632c9925f013	112
donatien	0:632c9925f013	113	udphdr = (struct udp_hdr *)p->payload;
donatien	0:632c9925f013	114
donatien	0:632c9925f013	115	/* is broadcast packet ? */
donatien	0:632c9925f013	116	broadcast = ip_addr_isbroadcast(&(iphdr->dest), inp);
donatien	0:632c9925f013	117
donatien	0:632c9925f013	118	LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
donatien	0:632c9925f013	119
donatien	0:632c9925f013	120	/* convert src and dest ports to host byte order */
donatien	0:632c9925f013	121	src = ntohs(udphdr->src);
donatien	0:632c9925f013	122	dest = ntohs(udphdr->dest);
donatien	0:632c9925f013	123
donatien	0:632c9925f013	124	udp_debug_print(udphdr);
donatien	0:632c9925f013	125
donatien	0:632c9925f013	126	/* print the UDP source and destination */
donatien	0:632c9925f013	127	LWIP_DEBUGF(UDP_DEBUG,
donatien	0:632c9925f013	128	("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
donatien	0:632c9925f013	129	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
donatien	0:632c9925f013	130	ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
donatien	0:632c9925f013	131	ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
donatien	0:632c9925f013	132	ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
donatien	0:632c9925f013	133	ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
donatien	0:632c9925f013	134
donatien	0:632c9925f013	135	#if LWIP_DHCP
donatien	0:632c9925f013	136	pcb = NULL;
donatien	0:632c9925f013	137	/* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
donatien	0:632c9925f013	138	the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
donatien	0:632c9925f013	139	if (dest == DHCP_CLIENT_PORT) {
donatien	0:632c9925f013	140	/* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
donatien	0:632c9925f013	141	if (src == DHCP_SERVER_PORT) {
donatien	0:632c9925f013	142	if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
donatien	0:632c9925f013	143	/* accept the packe if
donatien	0:632c9925f013	144	(- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
donatien	0:632c9925f013	145	- inp->dhcp->pcb->remote == ANY or iphdr->src */
donatien	0:632c9925f013	146	if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) \|\|
donatien	0:632c9925f013	147	ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &(iphdr->src)))) {
donatien	0:632c9925f013	148	pcb = inp->dhcp->pcb;
donatien	0:632c9925f013	149	}
donatien	0:632c9925f013	150	}
donatien	0:632c9925f013	151	}
donatien	0:632c9925f013	152	} else
donatien	0:632c9925f013	153	#endif /* LWIP_DHCP */
donatien	0:632c9925f013	154	{
donatien	0:632c9925f013	155	prev = NULL;
donatien	0:632c9925f013	156	local_match = 0;
donatien	0:632c9925f013	157	uncon_pcb = NULL;
donatien	0:632c9925f013	158	/* Iterate through the UDP pcb list for a matching pcb.
donatien	0:632c9925f013	159	* 'Perfect match' pcbs (connected to the remote port & ip address) are
donatien	0:632c9925f013	160	* preferred. If no perfect match is found, the first unconnected pcb that
donatien	0:632c9925f013	161	* matches the local port and ip address gets the datagram. */
donatien	0:632c9925f013	162	for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
donatien	0:632c9925f013	163	local_match = 0;
donatien	0:632c9925f013	164	/* print the PCB local and remote address */
donatien	0:632c9925f013	165	LWIP_DEBUGF(UDP_DEBUG,
donatien	0:632c9925f013	166	("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
donatien	0:632c9925f013	167	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
donatien	0:632c9925f013	168	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
donatien	0:632c9925f013	169	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
donatien	0:632c9925f013	170	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
donatien	0:632c9925f013	171	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
donatien	0:632c9925f013	172
donatien	0:632c9925f013	173	/* compare PCB local addr+port to UDP destination addr+port */
donatien	0:632c9925f013	174	if ((pcb->local_port == dest) &&
donatien	0:632c9925f013	175	((!broadcast && ip_addr_isany(&pcb->local_ip)) \|\|
donatien	0:632c9925f013	176	ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)) \|\|
donatien	0:632c9925f013	177	#if LWIP_IGMP
donatien	0:632c9925f013	178	ip_addr_ismulticast(&(iphdr->dest)) \|\|
donatien	0:632c9925f013	179	#endif /* LWIP_IGMP */
donatien	0:632c9925f013	180	#if IP_SOF_BROADCAST_RECV
donatien	0:632c9925f013	181	(broadcast && (pcb->so_options & SOF_BROADCAST)))) {
donatien	0:632c9925f013	182	#else /* IP_SOF_BROADCAST_RECV */
donatien	0:632c9925f013	183	(broadcast))) {
donatien	0:632c9925f013	184	#endif /* IP_SOF_BROADCAST_RECV */
donatien	0:632c9925f013	185	local_match = 1;
donatien	0:632c9925f013	186	if ((uncon_pcb == NULL) &&
donatien	0:632c9925f013	187	((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
donatien	0:632c9925f013	188	/* the first unconnected matching PCB */
donatien	0:632c9925f013	189	uncon_pcb = pcb;
donatien	0:632c9925f013	190	}
donatien	0:632c9925f013	191	}
donatien	0:632c9925f013	192	/* compare PCB remote addr+port to UDP source addr+port */
donatien	0:632c9925f013	193	if ((local_match != 0) &&
donatien	0:632c9925f013	194	(pcb->remote_port == src) &&
donatien	0:632c9925f013	195	(ip_addr_isany(&pcb->remote_ip) \|\|
donatien	0:632c9925f013	196	ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src)))) {
donatien	0:632c9925f013	197	/* the first fully matching PCB */
donatien	0:632c9925f013	198	if (prev != NULL) {
donatien	0:632c9925f013	199	/* move the pcb to the front of udp_pcbs so that is
donatien	0:632c9925f013	200	found faster next time */
donatien	0:632c9925f013	201	prev->next = pcb->next;
donatien	0:632c9925f013	202	pcb->next = udp_pcbs;
donatien	0:632c9925f013	203	udp_pcbs = pcb;
donatien	0:632c9925f013	204	} else {
donatien	0:632c9925f013	205	UDP_STATS_INC(udp.cachehit);
donatien	0:632c9925f013	206	}
donatien	0:632c9925f013	207	break;
donatien	0:632c9925f013	208	}
donatien	0:632c9925f013	209	prev = pcb;
donatien	0:632c9925f013	210	}
donatien	0:632c9925f013	211	/* no fully matching pcb found? then look for an unconnected pcb */
donatien	0:632c9925f013	212	if (pcb == NULL) {
donatien	0:632c9925f013	213	pcb = uncon_pcb;
donatien	0:632c9925f013	214	}
donatien	0:632c9925f013	215	}
donatien	0:632c9925f013	216
donatien	0:632c9925f013	217	/* Check checksum if this is a match or if it was directed at us. */
donatien	0:632c9925f013	218	if (pcb != NULL \|\| ip_addr_cmp(&inp->ip_addr, &iphdr->dest)) {
donatien	0:632c9925f013	219	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
donatien	0:632c9925f013	220	#if LWIP_UDPLITE
donatien	0:632c9925f013	221	if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
donatien	0:632c9925f013	222	/* Do the UDP Lite checksum */
donatien	0:632c9925f013	223	#if CHECKSUM_CHECK_UDP
donatien	0:632c9925f013	224	u16_t chklen = ntohs(udphdr->len);
donatien	0:632c9925f013	225	if (chklen < sizeof(struct udp_hdr)) {
donatien	0:632c9925f013	226	if (chklen == 0) {
donatien	0:632c9925f013	227	/* For UDP-Lite, checksum length of 0 means checksum
donatien	0:632c9925f013	228	over the complete packet (See RFC 3828 chap. 3.1) */
donatien	0:632c9925f013	229	chklen = p->tot_len;
donatien	0:632c9925f013	230	} else {
donatien	0:632c9925f013	231	/* At least the UDP-Lite header must be covered by the
donatien	0:632c9925f013	232	checksum! (Again, see RFC 3828 chap. 3.1) */
donatien	0:632c9925f013	233	UDP_STATS_INC(udp.chkerr);
donatien	0:632c9925f013	234	UDP_STATS_INC(udp.drop);
donatien	0:632c9925f013	235	snmp_inc_udpinerrors();
donatien	0:632c9925f013	236	pbuf_free(p);
donatien	0:632c9925f013	237	goto end;
donatien	0:632c9925f013	238	}
donatien	0:632c9925f013	239	}
donatien	0:632c9925f013	240	if (inet_chksum_pseudo_partial(p, &iphdr->src, &iphdr->dest,
donatien	0:632c9925f013	241	IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
donatien	0:632c9925f013	242	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:632c9925f013	243	("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
donatien	0:632c9925f013	244	UDP_STATS_INC(udp.chkerr);
donatien	0:632c9925f013	245	UDP_STATS_INC(udp.drop);
donatien	0:632c9925f013	246	snmp_inc_udpinerrors();
donatien	0:632c9925f013	247	pbuf_free(p);
donatien	0:632c9925f013	248	goto end;
donatien	0:632c9925f013	249	}
donatien	0:632c9925f013	250	#endif /* CHECKSUM_CHECK_UDP */
donatien	0:632c9925f013	251	} else
donatien	0:632c9925f013	252	#endif /* LWIP_UDPLITE */
donatien	0:632c9925f013	253	{
donatien	0:632c9925f013	254	#if CHECKSUM_CHECK_UDP
donatien	0:632c9925f013	255	if (udphdr->chksum != 0) {
donatien	0:632c9925f013	256	if (inet_chksum_pseudo(p, &iphdr->src, &iphdr->dest,
donatien	0:632c9925f013	257	IP_PROTO_UDP, p->tot_len) != 0) {
donatien	0:632c9925f013	258	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:632c9925f013	259	("udp_input: UDP datagram discarded due to failing checksum\n"));
donatien	0:632c9925f013	260	UDP_STATS_INC(udp.chkerr);
donatien	0:632c9925f013	261	UDP_STATS_INC(udp.drop);
donatien	0:632c9925f013	262	snmp_inc_udpinerrors();
donatien	0:632c9925f013	263	pbuf_free(p);
donatien	0:632c9925f013	264	goto end;
donatien	0:632c9925f013	265	}
donatien	0:632c9925f013	266	}
donatien	0:632c9925f013	267	#endif /* CHECKSUM_CHECK_UDP */
donatien	0:632c9925f013	268	}
donatien	0:632c9925f013	269	if(pbuf_header(p, -UDP_HLEN)) {
donatien	0:632c9925f013	270	/* Can we cope with this failing? Just assert for now */
donatien	0:632c9925f013	271	LWIP_ASSERT("pbuf_header failed\n", 0);
donatien	0:632c9925f013	272	UDP_STATS_INC(udp.drop);
donatien	0:632c9925f013	273	snmp_inc_udpinerrors();
donatien	0:632c9925f013	274	pbuf_free(p);
donatien	0:632c9925f013	275	goto end;
donatien	0:632c9925f013	276	}
donatien	0:632c9925f013	277	if (pcb != NULL) {
donatien	0:632c9925f013	278	snmp_inc_udpindatagrams();
donatien	0:632c9925f013	279	/* callback */
donatien	0:632c9925f013	280	if (pcb->recv != NULL) {
donatien	0:632c9925f013	281	/* now the recv function is responsible for freeing p */
donatien	0:632c9925f013	282	pcb->recv(pcb->recv_arg, pcb, p, &iphdr->src, src);
donatien	0:632c9925f013	283	} else {
donatien	0:632c9925f013	284	/* no recv function registered? then we have to free the pbuf! */
donatien	0:632c9925f013	285	pbuf_free(p);
donatien	0:632c9925f013	286	goto end;
donatien	0:632c9925f013	287	}
donatien	0:632c9925f013	288	} else {
donatien	0:632c9925f013	289	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
donatien	0:632c9925f013	290
donatien	0:632c9925f013	291	#if LWIP_ICMP
donatien	0:632c9925f013	292	/* No match was found, send ICMP destination port unreachable unless
donatien	0:632c9925f013	293	destination address was broadcast/multicast. */
donatien	0:632c9925f013	294	if (!broadcast &&
donatien	0:632c9925f013	295	!ip_addr_ismulticast(&iphdr->dest)) {
donatien	0:632c9925f013	296	/* move payload pointer back to ip header */
donatien	0:632c9925f013	297	pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
donatien	0:632c9925f013	298	LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
donatien	0:632c9925f013	299	icmp_dest_unreach(p, ICMP_DUR_PORT);
donatien	0:632c9925f013	300	}
donatien	0:632c9925f013	301	#endif /* LWIP_ICMP */
donatien	0:632c9925f013	302	UDP_STATS_INC(udp.proterr);
donatien	0:632c9925f013	303	UDP_STATS_INC(udp.drop);
donatien	0:632c9925f013	304	snmp_inc_udpnoports();
donatien	0:632c9925f013	305	pbuf_free(p);
donatien	0:632c9925f013	306	}
donatien	0:632c9925f013	307	} else {
donatien	0:632c9925f013	308	pbuf_free(p);
donatien	0:632c9925f013	309	}
donatien	0:632c9925f013	310	end:
donatien	0:632c9925f013	311	PERF_STOP("udp_input");
donatien	0:632c9925f013	312	}
donatien	0:632c9925f013	313
donatien	0:632c9925f013	314	/**
donatien	0:632c9925f013	315	* Send data using UDP.
donatien	0:632c9925f013	316	*
donatien	0:632c9925f013	317	* @param pcb UDP PCB used to send the data.
donatien	0:632c9925f013	318	* @param p chain of pbuf's to be sent.
donatien	0:632c9925f013	319	*
donatien	0:632c9925f013	320	* The datagram will be sent to the current remote_ip & remote_port
donatien	0:632c9925f013	321	* stored in pcb. If the pcb is not bound to a port, it will
donatien	0:632c9925f013	322	* automatically be bound to a random port.
donatien	0:632c9925f013	323	*
donatien	0:632c9925f013	324	* @return lwIP error code.
donatien	0:632c9925f013	325	* - ERR_OK. Successful. No error occured.
donatien	0:632c9925f013	326	* - ERR_MEM. Out of memory.
donatien	0:632c9925f013	327	* - ERR_RTE. Could not find route to destination address.
donatien	0:632c9925f013	328	* - More errors could be returned by lower protocol layers.
donatien	0:632c9925f013	329	*
donatien	0:632c9925f013	330	* @see udp_disconnect() udp_sendto()
donatien	0:632c9925f013	331	*/
donatien	0:632c9925f013	332	err_t
donatien	0:632c9925f013	333	udp_send(struct udp_pcb pcb, struct pbuf p)
donatien	0:632c9925f013	334	{
donatien	0:632c9925f013	335	/* send to the packet using remote ip and port stored in the pcb */
donatien	0:632c9925f013	336	return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
donatien	0:632c9925f013	337	}
donatien	0:632c9925f013	338
donatien	0:632c9925f013	339	/**
donatien	0:632c9925f013	340	* Send data to a specified address using UDP.
donatien	0:632c9925f013	341	*
donatien	0:632c9925f013	342	* @param pcb UDP PCB used to send the data.
donatien	0:632c9925f013	343	* @param p chain of pbuf's to be sent.
donatien	0:632c9925f013	344	* @param dst_ip Destination IP address.
donatien	0:632c9925f013	345	* @param dst_port Destination UDP port.
donatien	0:632c9925f013	346	*
donatien	0:632c9925f013	347	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
donatien	0:632c9925f013	348	*
donatien	0:632c9925f013	349	* If the PCB already has a remote address association, it will
donatien	0:632c9925f013	350	* be restored after the data is sent.
donatien	0:632c9925f013	351	*
donatien	0:632c9925f013	352	* @return lwIP error code (@see udp_send for possible error codes)
donatien	0:632c9925f013	353	*
donatien	0:632c9925f013	354	* @see udp_disconnect() udp_send()
donatien	0:632c9925f013	355	*/
donatien	0:632c9925f013	356	err_t
donatien	0:632c9925f013	357	udp_sendto(struct udp_pcb pcb, struct pbuf p,
donatien	0:632c9925f013	358	ip_addr_t *dst_ip, u16_t dst_port)
donatien	0:632c9925f013	359	{
donatien	0:632c9925f013	360	struct netif *netif;
donatien	0:632c9925f013	361
donatien	0:632c9925f013	362	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send\n"));
donatien	0:632c9925f013	363
donatien	0:632c9925f013	364	/* find the outgoing network interface for this packet */
donatien	0:632c9925f013	365	#if LWIP_IGMP
donatien	0:632c9925f013	366	netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
donatien	0:632c9925f013	367	#else
donatien	0:632c9925f013	368	netif = ip_route(dst_ip);
donatien	0:632c9925f013	369	#endif /* LWIP_IGMP */
donatien	0:632c9925f013	370
donatien	0:632c9925f013	371	/* no outgoing network interface could be found? */
donatien	0:632c9925f013	372	if (netif == NULL) {
donatien	0:632c9925f013	373	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
donatien	0:632c9925f013	374	ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
donatien	0:632c9925f013	375	UDP_STATS_INC(udp.rterr);
donatien	0:632c9925f013	376	return ERR_RTE;
donatien	0:632c9925f013	377	}
donatien	0:632c9925f013	378	return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
donatien	0:632c9925f013	379	}
donatien	0:632c9925f013	380
donatien	0:632c9925f013	381	/**
donatien	0:632c9925f013	382	* Send data to a specified address using UDP.
donatien	0:632c9925f013	383	* The netif used for sending can be specified.
donatien	0:632c9925f013	384	*
donatien	0:632c9925f013	385	* This function exists mainly for DHCP, to be able to send UDP packets
donatien	0:632c9925f013	386	* on a netif that is still down.
donatien	0:632c9925f013	387	*
donatien	0:632c9925f013	388	* @param pcb UDP PCB used to send the data.
donatien	0:632c9925f013	389	* @param p chain of pbuf's to be sent.
donatien	0:632c9925f013	390	* @param dst_ip Destination IP address.
donatien	0:632c9925f013	391	* @param dst_port Destination UDP port.
donatien	0:632c9925f013	392	* @param netif the netif used for sending.
donatien	0:632c9925f013	393	*
donatien	0:632c9925f013	394	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
donatien	0:632c9925f013	395	*
donatien	0:632c9925f013	396	* @return lwIP error code (@see udp_send for possible error codes)
donatien	0:632c9925f013	397	*
donatien	0:632c9925f013	398	* @see udp_disconnect() udp_send()
donatien	0:632c9925f013	399	*/
donatien	0:632c9925f013	400	err_t
donatien	0:632c9925f013	401	udp_sendto_if(struct udp_pcb pcb, struct pbuf p,
donatien	0:632c9925f013	402	ip_addr_t dst_ip, u16_t dst_port, struct netif netif)
donatien	0:632c9925f013	403	{
donatien	0:632c9925f013	404	struct udp_hdr *udphdr;
donatien	0:632c9925f013	405	ip_addr_t *src_ip;
donatien	0:632c9925f013	406	err_t err;
donatien	0:632c9925f013	407	struct pbuf q; / q will be sent down the stack */
donatien	0:632c9925f013	408
donatien	0:632c9925f013	409	#if IP_SOF_BROADCAST
donatien	0:632c9925f013	410	/* broadcast filter? */
donatien	0:632c9925f013	411	if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
donatien	0:632c9925f013	412	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
donatien	0:632c9925f013	413	("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
donatien	0:632c9925f013	414	return ERR_VAL;
donatien	0:632c9925f013	415	}
donatien	0:632c9925f013	416	#endif /* IP_SOF_BROADCAST */
donatien	0:632c9925f013	417
donatien	0:632c9925f013	418	/* if the PCB is not yet bound to a port, bind it here */
donatien	0:632c9925f013	419	if (pcb->local_port == 0) {
donatien	0:632c9925f013	420	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
donatien	0:632c9925f013	421	err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
donatien	0:632c9925f013	422	if (err != ERR_OK) {
donatien	0:632c9925f013	423	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
donatien	0:632c9925f013	424	return err;
donatien	0:632c9925f013	425	}
donatien	0:632c9925f013	426	}
donatien	0:632c9925f013	427
donatien	0:632c9925f013	428	/* not enough space to add an UDP header to first pbuf in given p chain? */
donatien	0:632c9925f013	429	if (pbuf_header(p, UDP_HLEN)) {
donatien	0:632c9925f013	430	/* allocate header in a separate new pbuf */
donatien	0:632c9925f013	431	q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
donatien	0:632c9925f013	432	/* new header pbuf could not be allocated? */
donatien	0:632c9925f013	433	if (q == NULL) {
donatien	0:632c9925f013	434	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
donatien	0:632c9925f013	435	return ERR_MEM;
donatien	0:632c9925f013	436	}
donatien	0:632c9925f013	437	/* chain header q in front of given pbuf p */
donatien	0:632c9925f013	438	pbuf_chain(q, p);
donatien	0:632c9925f013	439	/* first pbuf q points to header pbuf */
donatien	0:632c9925f013	440	LWIP_DEBUGF(UDP_DEBUG,
donatien	0:632c9925f013	441	("udp_send: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
donatien	0:632c9925f013	442	} else {
donatien	0:632c9925f013	443	/* adding space for header within p succeeded */
donatien	0:632c9925f013	444	/* first pbuf q equals given pbuf */
donatien	0:632c9925f013	445	q = p;
donatien	0:632c9925f013	446	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
donatien	0:632c9925f013	447	}
donatien	0:632c9925f013	448	LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
donatien	0:632c9925f013	449	(q->len >= sizeof(struct udp_hdr)));
donatien	0:632c9925f013	450	/* q now represents the packet to be sent */
donatien	0:632c9925f013	451	udphdr = (struct udp_hdr *)q->payload;
donatien	0:632c9925f013	452	udphdr->src = htons(pcb->local_port);
donatien	0:632c9925f013	453	udphdr->dest = htons(dst_port);
donatien	0:632c9925f013	454	/* in UDP, 0 checksum means 'no checksum' */
donatien	0:632c9925f013	455	udphdr->chksum = 0x0000;
donatien	0:632c9925f013	456
donatien	0:632c9925f013	457	/* PCB local address is IP_ANY_ADDR? */
donatien	0:632c9925f013	458	if (ip_addr_isany(&pcb->local_ip)) {
donatien	0:632c9925f013	459	/* use outgoing network interface IP address as source address */
donatien	0:632c9925f013	460	src_ip = &(netif->ip_addr);
donatien	0:632c9925f013	461	} else {
donatien	0:632c9925f013	462	/* check if UDP PCB local IP address is correct
donatien	0:632c9925f013	463	* this could be an old address if netif->ip_addr has changed */
donatien	0:632c9925f013	464	if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
donatien	0:632c9925f013	465	/* local_ip doesn't match, drop the packet */
donatien	0:632c9925f013	466	if (q != p) {
donatien	0:632c9925f013	467	/* free the header pbuf */
donatien	0:632c9925f013	468	pbuf_free(q);
donatien	0:632c9925f013	469	q = NULL;
donatien	0:632c9925f013	470	/* p is still referenced by the caller, and will live on */
donatien	0:632c9925f013	471	}
donatien	0:632c9925f013	472	return ERR_VAL;
donatien	0:632c9925f013	473	}
donatien	0:632c9925f013	474	/* use UDP PCB local IP address as source address */
donatien	0:632c9925f013	475	src_ip = &(pcb->local_ip);
donatien	0:632c9925f013	476	}
donatien	0:632c9925f013	477
donatien	0:632c9925f013	478	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
donatien	0:632c9925f013	479
donatien	0:632c9925f013	480	#if LWIP_UDPLITE
donatien	0:632c9925f013	481	/* UDP Lite protocol? */
donatien	0:632c9925f013	482	if (pcb->flags & UDP_FLAGS_UDPLITE) {
donatien	0:632c9925f013	483	u16_t chklen, chklen_hdr;
donatien	0:632c9925f013	484	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
donatien	0:632c9925f013	485	/* set UDP message length in UDP header */
donatien	0:632c9925f013	486	chklen_hdr = chklen = pcb->chksum_len_tx;
donatien	0:632c9925f013	487	if ((chklen < sizeof(struct udp_hdr)) \|\| (chklen > q->tot_len)) {
donatien	0:632c9925f013	488	if (chklen != 0) {
donatien	0:632c9925f013	489	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
donatien	0:632c9925f013	490	}
donatien	0:632c9925f013	491	/* For UDP-Lite, checksum length of 0 means checksum
donatien	0:632c9925f013	492	over the complete packet. (See RFC 3828 chap. 3.1)
donatien	0:632c9925f013	493	At least the UDP-Lite header must be covered by the
donatien	0:632c9925f013	494	checksum, therefore, if chksum_len has an illegal
donatien	0:632c9925f013	495	value, we generate the checksum over the complete
donatien	0:632c9925f013	496	packet to be safe. */
donatien	0:632c9925f013	497	chklen_hdr = 0;
donatien	0:632c9925f013	498	chklen = q->tot_len;
donatien	0:632c9925f013	499	}
donatien	0:632c9925f013	500	udphdr->len = htons(chklen_hdr);
donatien	0:632c9925f013	501	/* calculate checksum */
donatien	0:632c9925f013	502	#if CHECKSUM_GEN_UDP
donatien	0:632c9925f013	503	udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
donatien	0:632c9925f013	504	IP_PROTO_UDPLITE, q->tot_len, chklen);
donatien	0:632c9925f013	505	/* chksum zero must become 0xffff, as zero means 'no checksum' */
donatien	0:632c9925f013	506	if (udphdr->chksum == 0x0000) {
donatien	0:632c9925f013	507	udphdr->chksum = 0xffff;
donatien	0:632c9925f013	508	}
donatien	0:632c9925f013	509	#endif /* CHECKSUM_GEN_UDP */
donatien	0:632c9925f013	510	/* output to IP */
donatien	0:632c9925f013	511	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
donatien	0:632c9925f013	512	#if LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	513	netif->addr_hint = &(pcb->addr_hint);
donatien	0:632c9925f013	514	#endif /* LWIP_NETIF_HWADDRHINT*/
donatien	0:632c9925f013	515	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
donatien	0:632c9925f013	516	#if LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	517	netif->addr_hint = NULL;
donatien	0:632c9925f013	518	#endif /* LWIP_NETIF_HWADDRHINT*/
donatien	0:632c9925f013	519	} else
donatien	0:632c9925f013	520	#endif /* LWIP_UDPLITE */
donatien	0:632c9925f013	521	{ /* UDP */
donatien	0:632c9925f013	522	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
donatien	0:632c9925f013	523	udphdr->len = htons(q->tot_len);
donatien	0:632c9925f013	524	/* calculate checksum */
donatien	0:632c9925f013	525	#if CHECKSUM_GEN_UDP
donatien	0:632c9925f013	526	if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
donatien	0:632c9925f013	527	udphdr->chksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
donatien	0:632c9925f013	528	/* chksum zero must become 0xffff, as zero means 'no checksum' */
donatien	0:632c9925f013	529	if (udphdr->chksum == 0x0000) {
donatien	0:632c9925f013	530	udphdr->chksum = 0xffff;
donatien	0:632c9925f013	531	}
donatien	0:632c9925f013	532	}
donatien	0:632c9925f013	533	#endif /* CHECKSUM_GEN_UDP */
donatien	0:632c9925f013	534	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
donatien	0:632c9925f013	535	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
donatien	0:632c9925f013	536	/* output to IP */
donatien	0:632c9925f013	537	#if LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	538	netif->addr_hint = &(pcb->addr_hint);
donatien	0:632c9925f013	539	#endif /* LWIP_NETIF_HWADDRHINT*/
donatien	0:632c9925f013	540	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
donatien	0:632c9925f013	541	#if LWIP_NETIF_HWADDRHINT
donatien	0:632c9925f013	542	netif->addr_hint = NULL;
donatien	0:632c9925f013	543	#endif /* LWIP_NETIF_HWADDRHINT*/
donatien	0:632c9925f013	544	}
donatien	0:632c9925f013	545	/* TODO: must this be increased even if error occured? */
donatien	0:632c9925f013	546	snmp_inc_udpoutdatagrams();
donatien	0:632c9925f013	547
donatien	0:632c9925f013	548	/* did we chain a separate header pbuf earlier? */
donatien	0:632c9925f013	549	if (q != p) {
donatien	0:632c9925f013	550	/* free the header pbuf */
donatien	0:632c9925f013	551	pbuf_free(q);
donatien	0:632c9925f013	552	q = NULL;
donatien	0:632c9925f013	553	/* p is still referenced by the caller, and will live on */
donatien	0:632c9925f013	554	}
donatien	0:632c9925f013	555
donatien	0:632c9925f013	556	UDP_STATS_INC(udp.xmit);
donatien	0:632c9925f013	557	return err;
donatien	0:632c9925f013	558	}
donatien	0:632c9925f013	559
donatien	0:632c9925f013	560	/**
donatien	0:632c9925f013	561	* Bind an UDP PCB.
donatien	0:632c9925f013	562	*
donatien	0:632c9925f013	563	* @param pcb UDP PCB to be bound with a local address ipaddr and port.
donatien	0:632c9925f013	564	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
donatien	0:632c9925f013	565	* bind to all local interfaces.
donatien	0:632c9925f013	566	* @param port local UDP port to bind with. Use 0 to automatically bind
donatien	0:632c9925f013	567	* to a random port between UDP_LOCAL_PORT_RANGE_START and
donatien	0:632c9925f013	568	* UDP_LOCAL_PORT_RANGE_END.
donatien	0:632c9925f013	569	*
donatien	0:632c9925f013	570	* ipaddr & port are expected to be in the same byte order as in the pcb.
donatien	0:632c9925f013	571	*
donatien	0:632c9925f013	572	* @return lwIP error code.
donatien	0:632c9925f013	573	* - ERR_OK. Successful. No error occured.
donatien	0:632c9925f013	574	* - ERR_USE. The specified ipaddr and port are already bound to by
donatien	0:632c9925f013	575	* another UDP PCB.
donatien	0:632c9925f013	576	*
donatien	0:632c9925f013	577	* @see udp_disconnect()
donatien	0:632c9925f013	578	*/
donatien	0:632c9925f013	579	err_t
donatien	0:632c9925f013	580	udp_bind(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
donatien	0:632c9925f013	581	{
donatien	0:632c9925f013	582	struct udp_pcb *ipcb;
donatien	0:632c9925f013	583	u8_t rebind;
donatien	0:632c9925f013	584
donatien	0:632c9925f013	585	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
donatien	0:632c9925f013	586	ip_addr_debug_print(UDP_DEBUG, ipaddr);
donatien	0:632c9925f013	587	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
donatien	0:632c9925f013	588
donatien	0:632c9925f013	589	rebind = 0;
donatien	0:632c9925f013	590	/* Check for double bind and rebind of the same pcb */
donatien	0:632c9925f013	591	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
donatien	0:632c9925f013	592	/* is this UDP PCB already on active list? */
donatien	0:632c9925f013	593	if (pcb == ipcb) {
donatien	0:632c9925f013	594	/* pcb may occur at most once in active list */
donatien	0:632c9925f013	595	LWIP_ASSERT("rebind == 0", rebind == 0);
donatien	0:632c9925f013	596	/* pcb already in list, just rebind */
donatien	0:632c9925f013	597	rebind = 1;
donatien	0:632c9925f013	598	}
donatien	0:632c9925f013	599
donatien	0:632c9925f013	600	/* this code does not allow upper layer to share a UDP port for
donatien	0:632c9925f013	601	listening to broadcast or multicast traffic (See SO_REUSEADDR and
donatien	0:632c9925f013	602	SO_REUSEPORT under *BSD). TODO: See where it fits instead, OR
donatien	0:632c9925f013	603	combine with implementation of UDP PCB flags. Leon Woestenberg. */
donatien	0:632c9925f013	604	#ifdef LWIP_UDP_TODO
donatien	0:632c9925f013	605	/* port matches that of PCB in list? */
donatien	0:632c9925f013	606	else {
donatien	0:632c9925f013	607	if ((ipcb->local_port == port) &&
donatien	0:632c9925f013	608	/* IP address matches, or one is IP_ADDR_ANY? */
donatien	0:632c9925f013	609	(ip_addr_isany(&(ipcb->local_ip)) \|\|
donatien	0:632c9925f013	610	ip_addr_isany(ipaddr) \|\|
donatien	0:632c9925f013	611	ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
donatien	0:632c9925f013	612	/* other PCB already binds to this local IP and port */
donatien	0:632c9925f013	613	LWIP_DEBUGF(UDP_DEBUG,
donatien	0:632c9925f013	614	("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
donatien	0:632c9925f013	615	return ERR_USE;
donatien	0:632c9925f013	616	}
donatien	0:632c9925f013	617	}
donatien	0:632c9925f013	618	#endif
donatien	0:632c9925f013	619	}
donatien	0:632c9925f013	620
donatien	0:632c9925f013	621	ip_addr_set(&pcb->local_ip, ipaddr);
donatien	0:632c9925f013	622
donatien	0:632c9925f013	623	/* no port specified? */
donatien	0:632c9925f013	624	if (port == 0) {
donatien	0:632c9925f013	625	#ifndef UDP_LOCAL_PORT_RANGE_START
donatien	0:632c9925f013	626	#define UDP_LOCAL_PORT_RANGE_START 4096
donatien	0:632c9925f013	627	#define UDP_LOCAL_PORT_RANGE_END 0x7fff
donatien	0:632c9925f013	628	#endif
donatien	0:632c9925f013	629	port = UDP_LOCAL_PORT_RANGE_START;
donatien	0:632c9925f013	630	ipcb = udp_pcbs;
donatien	0:632c9925f013	631	while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
donatien	0:632c9925f013	632	if (ipcb->local_port == port) {
donatien	0:632c9925f013	633	/* port is already used by another udp_pcb */
donatien	0:632c9925f013	634	port++;
donatien	0:632c9925f013	635	/* restart scanning all udp pcbs */
donatien	0:632c9925f013	636	ipcb = udp_pcbs;
donatien	0:632c9925f013	637	} else {
donatien	0:632c9925f013	638	/* go on with next udp pcb */
donatien	0:632c9925f013	639	ipcb = ipcb->next;
donatien	0:632c9925f013	640	}
donatien	0:632c9925f013	641	}
donatien	0:632c9925f013	642	if (ipcb != NULL) {
donatien	0:632c9925f013	643	/* no more ports available in local range */
donatien	0:632c9925f013	644	LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
donatien	0:632c9925f013	645	return ERR_USE;
donatien	0:632c9925f013	646	}
donatien	0:632c9925f013	647	}
donatien	0:632c9925f013	648	pcb->local_port = port;
donatien	0:632c9925f013	649	snmp_insert_udpidx_tree(pcb);
donatien	0:632c9925f013	650	/* pcb not active yet? */
donatien	0:632c9925f013	651	if (rebind == 0) {
donatien	0:632c9925f013	652	/* place the PCB on the active list if not already there */
donatien	0:632c9925f013	653	pcb->next = udp_pcbs;
donatien	0:632c9925f013	654	udp_pcbs = pcb;
donatien	0:632c9925f013	655	}
donatien	0:632c9925f013	656	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
donatien	0:632c9925f013	657	("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
donatien	0:632c9925f013	658	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
donatien	0:632c9925f013	659	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
donatien	0:632c9925f013	660	pcb->local_port));
donatien	0:632c9925f013	661	return ERR_OK;
donatien	0:632c9925f013	662	}
donatien	0:632c9925f013	663	/**
donatien	0:632c9925f013	664	* Connect an UDP PCB.
donatien	0:632c9925f013	665	*
donatien	0:632c9925f013	666	* This will associate the UDP PCB with the remote address.
donatien	0:632c9925f013	667	*
donatien	0:632c9925f013	668	* @param pcb UDP PCB to be connected with remote address ipaddr and port.
donatien	0:632c9925f013	669	* @param ipaddr remote IP address to connect with.
donatien	0:632c9925f013	670	* @param port remote UDP port to connect with.
donatien	0:632c9925f013	671	*
donatien	0:632c9925f013	672	* @return lwIP error code
donatien	0:632c9925f013	673	*
donatien	0:632c9925f013	674	* ipaddr & port are expected to be in the same byte order as in the pcb.
donatien	0:632c9925f013	675	*
donatien	0:632c9925f013	676	* The udp pcb is bound to a random local port if not already bound.
donatien	0:632c9925f013	677	*
donatien	0:632c9925f013	678	* @see udp_disconnect()
donatien	0:632c9925f013	679	*/
donatien	0:632c9925f013	680	err_t
donatien	0:632c9925f013	681	udp_connect(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
donatien	0:632c9925f013	682	{
donatien	0:632c9925f013	683	struct udp_pcb *ipcb;
donatien	0:632c9925f013	684
donatien	0:632c9925f013	685	if (pcb->local_port == 0) {
donatien	0:632c9925f013	686	err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
donatien	0:632c9925f013	687	if (err != ERR_OK) {
donatien	0:632c9925f013	688	return err;
donatien	0:632c9925f013	689	}
donatien	0:632c9925f013	690	}
donatien	0:632c9925f013	691
donatien	0:632c9925f013	692	ip_addr_set(&pcb->remote_ip, ipaddr);
donatien	0:632c9925f013	693	pcb->remote_port = port;
donatien	0:632c9925f013	694	pcb->flags \|= UDP_FLAGS_CONNECTED;
donatien	0:632c9925f013	695	/** TODO: this functionality belongs in upper layers */
donatien	0:632c9925f013	696	#ifdef LWIP_UDP_TODO
donatien	0:632c9925f013	697	/* Nail down local IP for netconn_addr()/getsockname() */
donatien	0:632c9925f013	698	if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
donatien	0:632c9925f013	699	struct netif *netif;
donatien	0:632c9925f013	700
donatien	0:632c9925f013	701	if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
donatien	0:632c9925f013	702	LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
donatien	0:632c9925f013	703	UDP_STATS_INC(udp.rterr);
donatien	0:632c9925f013	704	return ERR_RTE;
donatien	0:632c9925f013	705	}
donatien	0:632c9925f013	706	/** TODO: this will bind the udp pcb locally, to the interface which
donatien	0:632c9925f013	707	is used to route output packets to the remote address. However, we
donatien	0:632c9925f013	708	might want to accept incoming packets on any interface! */
donatien	0:632c9925f013	709	pcb->local_ip = netif->ip_addr;
donatien	0:632c9925f013	710	} else if (ip_addr_isany(&pcb->remote_ip)) {
donatien	0:632c9925f013	711	pcb->local_ip.addr = 0;
donatien	0:632c9925f013	712	}
donatien	0:632c9925f013	713	#endif
donatien	0:632c9925f013	714	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
donatien	0:632c9925f013	715	("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
donatien	0:632c9925f013	716	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
donatien	0:632c9925f013	717	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
donatien	0:632c9925f013	718	pcb->local_port));
donatien	0:632c9925f013	719
donatien	0:632c9925f013	720	/* Insert UDP PCB into the list of active UDP PCBs. */
donatien	0:632c9925f013	721	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
donatien	0:632c9925f013	722	if (pcb == ipcb) {
donatien	0:632c9925f013	723	/* already on the list, just return */
donatien	0:632c9925f013	724	return ERR_OK;
donatien	0:632c9925f013	725	}
donatien	0:632c9925f013	726	}
donatien	0:632c9925f013	727	/* PCB not yet on the list, add PCB now */
donatien	0:632c9925f013	728	pcb->next = udp_pcbs;
donatien	0:632c9925f013	729	udp_pcbs = pcb;
donatien	0:632c9925f013	730	return ERR_OK;
donatien	0:632c9925f013	731	}
donatien	0:632c9925f013	732
donatien	0:632c9925f013	733	/**
donatien	0:632c9925f013	734	* Disconnect a UDP PCB
donatien	0:632c9925f013	735	*
donatien	0:632c9925f013	736	* @param pcb the udp pcb to disconnect.
donatien	0:632c9925f013	737	*/
donatien	0:632c9925f013	738	void
donatien	0:632c9925f013	739	udp_disconnect(struct udp_pcb *pcb)
donatien	0:632c9925f013	740	{
donatien	0:632c9925f013	741	/* reset remote address association */
donatien	0:632c9925f013	742	ip_addr_set_any(&pcb->remote_ip);
donatien	0:632c9925f013	743	pcb->remote_port = 0;
donatien	0:632c9925f013	744	/* mark PCB as unconnected */
donatien	0:632c9925f013	745	pcb->flags &= ~UDP_FLAGS_CONNECTED;
donatien	0:632c9925f013	746	}
donatien	0:632c9925f013	747
donatien	0:632c9925f013	748	/**
donatien	0:632c9925f013	749	* Set a receive callback for a UDP PCB
donatien	0:632c9925f013	750	*
donatien	0:632c9925f013	751	* This callback will be called when receiving a datagram for the pcb.
donatien	0:632c9925f013	752	*
donatien	0:632c9925f013	753	* @param pcb the pcb for wich to set the recv callback
donatien	0:632c9925f013	754	* @param recv function pointer of the callback function
donatien	0:632c9925f013	755	* @param recv_arg additional argument to pass to the callback function
donatien	0:632c9925f013	756	*/
donatien	0:632c9925f013	757	void
donatien	0:632c9925f013	758	udp_recv(struct udp_pcb pcb, udp_recv_fn recv, void recv_arg)
donatien	0:632c9925f013	759	{
donatien	0:632c9925f013	760	/* remember recv() callback and user data */
donatien	0:632c9925f013	761	pcb->recv = recv;
donatien	0:632c9925f013	762	pcb->recv_arg = recv_arg;
donatien	0:632c9925f013	763	}
donatien	0:632c9925f013	764
donatien	0:632c9925f013	765	/**
donatien	0:632c9925f013	766	* Remove an UDP PCB.
donatien	0:632c9925f013	767	*
donatien	0:632c9925f013	768	* @param pcb UDP PCB to be removed. The PCB is removed from the list of
donatien	0:632c9925f013	769	* UDP PCB's and the data structure is freed from memory.
donatien	0:632c9925f013	770	*
donatien	0:632c9925f013	771	* @see udp_new()
donatien	0:632c9925f013	772	*/
donatien	0:632c9925f013	773	void
donatien	0:632c9925f013	774	udp_remove(struct udp_pcb *pcb)
donatien	0:632c9925f013	775	{
donatien	0:632c9925f013	776	struct udp_pcb *pcb2;
donatien	0:632c9925f013	777
donatien	0:632c9925f013	778	snmp_delete_udpidx_tree(pcb);
donatien	0:632c9925f013	779	/* pcb to be removed is first in list? */
donatien	0:632c9925f013	780	if (udp_pcbs == pcb) {
donatien	0:632c9925f013	781	/* make list start at 2nd pcb */
donatien	0:632c9925f013	782	udp_pcbs = udp_pcbs->next;
donatien	0:632c9925f013	783	/* pcb not 1st in list */
donatien	0:632c9925f013	784	} else {
donatien	0:632c9925f013	785	for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
donatien	0:632c9925f013	786	/* find pcb in udp_pcbs list */
donatien	0:632c9925f013	787	if (pcb2->next != NULL && pcb2->next == pcb) {
donatien	0:632c9925f013	788	/* remove pcb from list */
donatien	0:632c9925f013	789	pcb2->next = pcb->next;
donatien	0:632c9925f013	790	}
donatien	0:632c9925f013	791	}
donatien	0:632c9925f013	792	}
donatien	0:632c9925f013	793	memp_free(MEMP_UDP_PCB, pcb);
donatien	0:632c9925f013	794	}
donatien	0:632c9925f013	795
donatien	0:632c9925f013	796	/**
donatien	0:632c9925f013	797	* Create a UDP PCB.
donatien	0:632c9925f013	798	*
donatien	0:632c9925f013	799	* @return The UDP PCB which was created. NULL if the PCB data structure
donatien	0:632c9925f013	800	* could not be allocated.
donatien	0:632c9925f013	801	*
donatien	0:632c9925f013	802	* @see udp_remove()
donatien	0:632c9925f013	803	*/
donatien	0:632c9925f013	804	struct udp_pcb *
donatien	0:632c9925f013	805	udp_new(void)
donatien	0:632c9925f013	806	{
donatien	0:632c9925f013	807	struct udp_pcb *pcb;
donatien	0:632c9925f013	808	pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
donatien	0:632c9925f013	809	/* could allocate UDP PCB? */
donatien	0:632c9925f013	810	if (pcb != NULL) {
donatien	0:632c9925f013	811	/* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
donatien	0:632c9925f013	812	* which means checksum is generated over the whole datagram per default
donatien	0:632c9925f013	813	* (recommended as default by RFC 3828). */
donatien	0:632c9925f013	814	/* initialize PCB to all zeroes */
donatien	0:632c9925f013	815	memset(pcb, 0, sizeof(struct udp_pcb));
donatien	0:632c9925f013	816	pcb->ttl = UDP_TTL;
donatien	0:632c9925f013	817	}
donatien	0:632c9925f013	818	return pcb;
donatien	0:632c9925f013	819	}
donatien	0:632c9925f013	820
donatien	0:632c9925f013	821	#if UDP_DEBUG
donatien	0:632c9925f013	822	/**
donatien	0:632c9925f013	823	* Print UDP header information for debug purposes.
donatien	0:632c9925f013	824	*
donatien	0:632c9925f013	825	* @param udphdr pointer to the udp header in memory.
donatien	0:632c9925f013	826	*/
donatien	0:632c9925f013	827	void
donatien	0:632c9925f013	828	udp_debug_print(struct udp_hdr *udphdr)
donatien	0:632c9925f013	829	{
donatien	0:632c9925f013	830	LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
donatien	0:632c9925f013	831	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
donatien	0:632c9925f013	832	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
donatien	0:632c9925f013	833	ntohs(udphdr->src), ntohs(udphdr->dest)));
donatien	0:632c9925f013	834	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
donatien	0:632c9925f013	835	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| 0x%04"X16_F" \| (len, chksum)\n",
donatien	0:632c9925f013	836	ntohs(udphdr->len), ntohs(udphdr->chksum)));
donatien	0:632c9925f013	837	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
donatien	0:632c9925f013	838	}
donatien	0:632c9925f013	839	#endif /* UDP_DEBUG */
donatien	0:632c9925f013	840
donatien	0:632c9925f013	841	#endif /* LWIP_UDP */

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Type:	Library
Created:	31 Dec 2013
Imports:	1
Forks:	0
Commits:	13
Dependents:	1
Dependencies:	0
Followers:	1

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lwip/core/udp.c@0:632c9925f013, 2010-06-11 (annotated)

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