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lwip/core/udp.c@0:ac21159e27f4, 2010-07-02 (annotated)

Committer:: darran
Date:: Fri Jul 02 17:21:58 2010 +0000
Revision:: 0:ac21159e27f4

Who changed what in which revision?

User	Revision	Line number	New contents of line
darran	0:ac21159e27f4	1	/**
darran	0:ac21159e27f4	2	* @file
darran	0:ac21159e27f4	3	* User Datagram Protocol module
darran	0:ac21159e27f4	4	*
darran	0:ac21159e27f4	5	*/
darran	0:ac21159e27f4	6
darran	0:ac21159e27f4	7	/*
darran	0:ac21159e27f4	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
darran	0:ac21159e27f4	9	* All rights reserved.
darran	0:ac21159e27f4	10	*
darran	0:ac21159e27f4	11	* Redistribution and use in source and binary forms, with or without modification,
darran	0:ac21159e27f4	12	* are permitted provided that the following conditions are met:
darran	0:ac21159e27f4	13	*
darran	0:ac21159e27f4	14	* 1. Redistributions of source code must retain the above copyright notice,
darran	0:ac21159e27f4	15	* this list of conditions and the following disclaimer.
darran	0:ac21159e27f4	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
darran	0:ac21159e27f4	17	* this list of conditions and the following disclaimer in the documentation
darran	0:ac21159e27f4	18	* and/or other materials provided with the distribution.
darran	0:ac21159e27f4	19	* 3. The name of the author may not be used to endorse or promote products
darran	0:ac21159e27f4	20	* derived from this software without specific prior written permission.
darran	0:ac21159e27f4	21	*
darran	0:ac21159e27f4	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
darran	0:ac21159e27f4	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
darran	0:ac21159e27f4	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
darran	0:ac21159e27f4	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
darran	0:ac21159e27f4	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
darran	0:ac21159e27f4	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
darran	0:ac21159e27f4	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
darran	0:ac21159e27f4	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
darran	0:ac21159e27f4	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
darran	0:ac21159e27f4	31	* OF SUCH DAMAGE.
darran	0:ac21159e27f4	32	*
darran	0:ac21159e27f4	33	* This file is part of the lwIP TCP/IP stack.
darran	0:ac21159e27f4	34	*
darran	0:ac21159e27f4	35	* Author: Adam Dunkels <adam@sics.se>
darran	0:ac21159e27f4	36	*
darran	0:ac21159e27f4	37	*/
darran	0:ac21159e27f4	38
darran	0:ac21159e27f4	39
darran	0:ac21159e27f4	40	/* udp.c
darran	0:ac21159e27f4	41	*
darran	0:ac21159e27f4	42	* The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
darran	0:ac21159e27f4	43	*
darran	0:ac21159e27f4	44	*/
darran	0:ac21159e27f4	45
darran	0:ac21159e27f4	46	/* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
darran	0:ac21159e27f4	47	*/
darran	0:ac21159e27f4	48
darran	0:ac21159e27f4	49	#include "lwip/opt.h"
darran	0:ac21159e27f4	50
darran	0:ac21159e27f4	51	#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
darran	0:ac21159e27f4	52
darran	0:ac21159e27f4	53	#include "lwip/udp.h"
darran	0:ac21159e27f4	54	#include "lwip/def.h"
darran	0:ac21159e27f4	55	#include "lwip/memp.h"
darran	0:ac21159e27f4	56	#include "lwip/inet_chksum.h"
darran	0:ac21159e27f4	57	#include "lwip/ip_addr.h"
darran	0:ac21159e27f4	58	#include "lwip/netif.h"
darran	0:ac21159e27f4	59	#include "lwip/icmp.h"
darran	0:ac21159e27f4	60	#include "lwip/stats.h"
darran	0:ac21159e27f4	61	#include "lwip/snmp.h"
darran	0:ac21159e27f4	62	#include "arch/perf.h"
darran	0:ac21159e27f4	63	#include "lwip/dhcp.h"
darran	0:ac21159e27f4	64
darran	0:ac21159e27f4	65	#include <string.h>
darran	0:ac21159e27f4	66
darran	0:ac21159e27f4	67	/* The list of UDP PCBs */
darran	0:ac21159e27f4	68	/* exported in udp.h (was static) */
darran	0:ac21159e27f4	69	struct udp_pcb *udp_pcbs;
darran	0:ac21159e27f4	70
darran	0:ac21159e27f4	71	/**
darran	0:ac21159e27f4	72	* Process an incoming UDP datagram.
darran	0:ac21159e27f4	73	*
darran	0:ac21159e27f4	74	* Given an incoming UDP datagram (as a chain of pbufs) this function
darran	0:ac21159e27f4	75	* finds a corresponding UDP PCB and hands over the pbuf to the pcbs
darran	0:ac21159e27f4	76	* recv function. If no pcb is found or the datagram is incorrect, the
darran	0:ac21159e27f4	77	* pbuf is freed.
darran	0:ac21159e27f4	78	*
darran	0:ac21159e27f4	79	* @param p pbuf to be demultiplexed to a UDP PCB.
darran	0:ac21159e27f4	80	* @param inp network interface on which the datagram was received.
darran	0:ac21159e27f4	81	*
darran	0:ac21159e27f4	82	*/
darran	0:ac21159e27f4	83	void
darran	0:ac21159e27f4	84	udp_input(struct pbuf p, struct netif inp)
darran	0:ac21159e27f4	85	{
darran	0:ac21159e27f4	86	struct udp_hdr *udphdr;
darran	0:ac21159e27f4	87	struct udp_pcb pcb, prev;
darran	0:ac21159e27f4	88	struct udp_pcb *uncon_pcb;
darran	0:ac21159e27f4	89	struct ip_hdr *iphdr;
darran	0:ac21159e27f4	90	u16_t src, dest;
darran	0:ac21159e27f4	91	u8_t local_match;
darran	0:ac21159e27f4	92	u8_t broadcast;
darran	0:ac21159e27f4	93
darran	0:ac21159e27f4	94	PERF_START;
darran	0:ac21159e27f4	95
darran	0:ac21159e27f4	96	UDP_STATS_INC(udp.recv);
darran	0:ac21159e27f4	97
darran	0:ac21159e27f4	98	iphdr = (struct ip_hdr *)p->payload;
darran	0:ac21159e27f4	99
darran	0:ac21159e27f4	100	/* Check minimum length (IP header + UDP header)
darran	0:ac21159e27f4	101	* and move payload pointer to UDP header */
darran	0:ac21159e27f4	102	if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) \|\| pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
darran	0:ac21159e27f4	103	/* drop short packets */
darran	0:ac21159e27f4	104	LWIP_DEBUGF(UDP_DEBUG,
darran	0:ac21159e27f4	105	("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
darran	0:ac21159e27f4	106	UDP_STATS_INC(udp.lenerr);
darran	0:ac21159e27f4	107	UDP_STATS_INC(udp.drop);
darran	0:ac21159e27f4	108	snmp_inc_udpinerrors();
darran	0:ac21159e27f4	109	pbuf_free(p);
darran	0:ac21159e27f4	110	goto end;
darran	0:ac21159e27f4	111	}
darran	0:ac21159e27f4	112
darran	0:ac21159e27f4	113	udphdr = (struct udp_hdr *)p->payload;
darran	0:ac21159e27f4	114
darran	0:ac21159e27f4	115	/* is broadcast packet ? */
darran	0:ac21159e27f4	116	broadcast = ip_addr_isbroadcast(&(iphdr->dest), inp);
darran	0:ac21159e27f4	117
darran	0:ac21159e27f4	118	LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
darran	0:ac21159e27f4	119
darran	0:ac21159e27f4	120	/* convert src and dest ports to host byte order */
darran	0:ac21159e27f4	121	src = ntohs(udphdr->src);
darran	0:ac21159e27f4	122	dest = ntohs(udphdr->dest);
darran	0:ac21159e27f4	123
darran	0:ac21159e27f4	124	udp_debug_print(udphdr);
darran	0:ac21159e27f4	125
darran	0:ac21159e27f4	126	/* print the UDP source and destination */
darran	0:ac21159e27f4	127	LWIP_DEBUGF(UDP_DEBUG,
darran	0:ac21159e27f4	128	("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
darran	0:ac21159e27f4	129	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
darran	0:ac21159e27f4	130	ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
darran	0:ac21159e27f4	131	ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
darran	0:ac21159e27f4	132	ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
darran	0:ac21159e27f4	133	ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
darran	0:ac21159e27f4	134
darran	0:ac21159e27f4	135	#if LWIP_DHCP
darran	0:ac21159e27f4	136	pcb = NULL;
darran	0:ac21159e27f4	137	/* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
darran	0:ac21159e27f4	138	the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
darran	0:ac21159e27f4	139	if (dest == DHCP_CLIENT_PORT) {
darran	0:ac21159e27f4	140	/* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
darran	0:ac21159e27f4	141	if (src == DHCP_SERVER_PORT) {
darran	0:ac21159e27f4	142	if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
darran	0:ac21159e27f4	143	/* accept the packe if
darran	0:ac21159e27f4	144	(- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
darran	0:ac21159e27f4	145	- inp->dhcp->pcb->remote == ANY or iphdr->src */
darran	0:ac21159e27f4	146	if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) \|\|
darran	0:ac21159e27f4	147	ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &(iphdr->src)))) {
darran	0:ac21159e27f4	148	pcb = inp->dhcp->pcb;
darran	0:ac21159e27f4	149	}
darran	0:ac21159e27f4	150	}
darran	0:ac21159e27f4	151	}
darran	0:ac21159e27f4	152	} else
darran	0:ac21159e27f4	153	#endif /* LWIP_DHCP */
darran	0:ac21159e27f4	154	{
darran	0:ac21159e27f4	155	prev = NULL;
darran	0:ac21159e27f4	156	local_match = 0;
darran	0:ac21159e27f4	157	uncon_pcb = NULL;
darran	0:ac21159e27f4	158	/* Iterate through the UDP pcb list for a matching pcb.
darran	0:ac21159e27f4	159	* 'Perfect match' pcbs (connected to the remote port & ip address) are
darran	0:ac21159e27f4	160	* preferred. If no perfect match is found, the first unconnected pcb that
darran	0:ac21159e27f4	161	* matches the local port and ip address gets the datagram. */
darran	0:ac21159e27f4	162	for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
darran	0:ac21159e27f4	163	local_match = 0;
darran	0:ac21159e27f4	164	/* print the PCB local and remote address */
darran	0:ac21159e27f4	165	LWIP_DEBUGF(UDP_DEBUG,
darran	0:ac21159e27f4	166	("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
darran	0:ac21159e27f4	167	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
darran	0:ac21159e27f4	168	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
darran	0:ac21159e27f4	169	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
darran	0:ac21159e27f4	170	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
darran	0:ac21159e27f4	171	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
darran	0:ac21159e27f4	172
darran	0:ac21159e27f4	173	/* compare PCB local addr+port to UDP destination addr+port */
darran	0:ac21159e27f4	174	if ((pcb->local_port == dest) &&
darran	0:ac21159e27f4	175	((!broadcast && ip_addr_isany(&pcb->local_ip)) \|\|
darran	0:ac21159e27f4	176	ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)) \|\|
darran	0:ac21159e27f4	177	#if LWIP_IGMP
darran	0:ac21159e27f4	178	ip_addr_ismulticast(&(iphdr->dest)) \|\|
darran	0:ac21159e27f4	179	#endif /* LWIP_IGMP */
darran	0:ac21159e27f4	180	#if IP_SOF_BROADCAST_RECV
darran	0:ac21159e27f4	181	(broadcast && (pcb->so_options & SOF_BROADCAST)))) {
darran	0:ac21159e27f4	182	#else /* IP_SOF_BROADCAST_RECV */
darran	0:ac21159e27f4	183	(broadcast))) {
darran	0:ac21159e27f4	184	#endif /* IP_SOF_BROADCAST_RECV */
darran	0:ac21159e27f4	185	local_match = 1;
darran	0:ac21159e27f4	186	if ((uncon_pcb == NULL) &&
darran	0:ac21159e27f4	187	((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
darran	0:ac21159e27f4	188	/* the first unconnected matching PCB */
darran	0:ac21159e27f4	189	uncon_pcb = pcb;
darran	0:ac21159e27f4	190	}
darran	0:ac21159e27f4	191	}
darran	0:ac21159e27f4	192	/* compare PCB remote addr+port to UDP source addr+port */
darran	0:ac21159e27f4	193	if ((local_match != 0) &&
darran	0:ac21159e27f4	194	(pcb->remote_port == src) &&
darran	0:ac21159e27f4	195	(ip_addr_isany(&pcb->remote_ip) \|\|
darran	0:ac21159e27f4	196	ip_addr_cmp(&(pcb->remote_ip), &(iphdr->src)))) {
darran	0:ac21159e27f4	197	/* the first fully matching PCB */
darran	0:ac21159e27f4	198	if (prev != NULL) {
darran	0:ac21159e27f4	199	/* move the pcb to the front of udp_pcbs so that is
darran	0:ac21159e27f4	200	found faster next time */
darran	0:ac21159e27f4	201	prev->next = pcb->next;
darran	0:ac21159e27f4	202	pcb->next = udp_pcbs;
darran	0:ac21159e27f4	203	udp_pcbs = pcb;
darran	0:ac21159e27f4	204	} else {
darran	0:ac21159e27f4	205	UDP_STATS_INC(udp.cachehit);
darran	0:ac21159e27f4	206	}
darran	0:ac21159e27f4	207	break;
darran	0:ac21159e27f4	208	}
darran	0:ac21159e27f4	209	prev = pcb;
darran	0:ac21159e27f4	210	}
darran	0:ac21159e27f4	211	/* no fully matching pcb found? then look for an unconnected pcb */
darran	0:ac21159e27f4	212	if (pcb == NULL) {
darran	0:ac21159e27f4	213	pcb = uncon_pcb;
darran	0:ac21159e27f4	214	}
darran	0:ac21159e27f4	215	}
darran	0:ac21159e27f4	216
darran	0:ac21159e27f4	217	/* Check checksum if this is a match or if it was directed at us. */
darran	0:ac21159e27f4	218	if (pcb != NULL \|\| ip_addr_cmp(&inp->ip_addr, &iphdr->dest)) {
darran	0:ac21159e27f4	219	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
darran	0:ac21159e27f4	220	#if LWIP_UDPLITE
darran	0:ac21159e27f4	221	if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
darran	0:ac21159e27f4	222	/* Do the UDP Lite checksum */
darran	0:ac21159e27f4	223	#if CHECKSUM_CHECK_UDP
darran	0:ac21159e27f4	224	u16_t chklen = ntohs(udphdr->len);
darran	0:ac21159e27f4	225	if (chklen < sizeof(struct udp_hdr)) {
darran	0:ac21159e27f4	226	if (chklen == 0) {
darran	0:ac21159e27f4	227	/* For UDP-Lite, checksum length of 0 means checksum
darran	0:ac21159e27f4	228	over the complete packet (See RFC 3828 chap. 3.1) */
darran	0:ac21159e27f4	229	chklen = p->tot_len;
darran	0:ac21159e27f4	230	} else {
darran	0:ac21159e27f4	231	/* At least the UDP-Lite header must be covered by the
darran	0:ac21159e27f4	232	checksum! (Again, see RFC 3828 chap. 3.1) */
darran	0:ac21159e27f4	233	UDP_STATS_INC(udp.chkerr);
darran	0:ac21159e27f4	234	UDP_STATS_INC(udp.drop);
darran	0:ac21159e27f4	235	snmp_inc_udpinerrors();
darran	0:ac21159e27f4	236	pbuf_free(p);
darran	0:ac21159e27f4	237	goto end;
darran	0:ac21159e27f4	238	}
darran	0:ac21159e27f4	239	}
darran	0:ac21159e27f4	240	if (inet_chksum_pseudo_partial(p, &iphdr->src, &iphdr->dest,
darran	0:ac21159e27f4	241	IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
darran	0:ac21159e27f4	242	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:ac21159e27f4	243	("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
darran	0:ac21159e27f4	244	UDP_STATS_INC(udp.chkerr);
darran	0:ac21159e27f4	245	UDP_STATS_INC(udp.drop);
darran	0:ac21159e27f4	246	snmp_inc_udpinerrors();
darran	0:ac21159e27f4	247	pbuf_free(p);
darran	0:ac21159e27f4	248	goto end;
darran	0:ac21159e27f4	249	}
darran	0:ac21159e27f4	250	#endif /* CHECKSUM_CHECK_UDP */
darran	0:ac21159e27f4	251	} else
darran	0:ac21159e27f4	252	#endif /* LWIP_UDPLITE */
darran	0:ac21159e27f4	253	{
darran	0:ac21159e27f4	254	#if CHECKSUM_CHECK_UDP
darran	0:ac21159e27f4	255	if (udphdr->chksum != 0) {
darran	0:ac21159e27f4	256	if (inet_chksum_pseudo(p, &iphdr->src, &iphdr->dest,
darran	0:ac21159e27f4	257	IP_PROTO_UDP, p->tot_len) != 0) {
darran	0:ac21159e27f4	258	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:ac21159e27f4	259	("udp_input: UDP datagram discarded due to failing checksum\n"));
darran	0:ac21159e27f4	260	UDP_STATS_INC(udp.chkerr);
darran	0:ac21159e27f4	261	UDP_STATS_INC(udp.drop);
darran	0:ac21159e27f4	262	snmp_inc_udpinerrors();
darran	0:ac21159e27f4	263	pbuf_free(p);
darran	0:ac21159e27f4	264	goto end;
darran	0:ac21159e27f4	265	}
darran	0:ac21159e27f4	266	}
darran	0:ac21159e27f4	267	#endif /* CHECKSUM_CHECK_UDP */
darran	0:ac21159e27f4	268	}
darran	0:ac21159e27f4	269	if(pbuf_header(p, -UDP_HLEN)) {
darran	0:ac21159e27f4	270	/* Can we cope with this failing? Just assert for now */
darran	0:ac21159e27f4	271	LWIP_ASSERT("pbuf_header failed\n", 0);
darran	0:ac21159e27f4	272	UDP_STATS_INC(udp.drop);
darran	0:ac21159e27f4	273	snmp_inc_udpinerrors();
darran	0:ac21159e27f4	274	pbuf_free(p);
darran	0:ac21159e27f4	275	goto end;
darran	0:ac21159e27f4	276	}
darran	0:ac21159e27f4	277	if (pcb != NULL) {
darran	0:ac21159e27f4	278	snmp_inc_udpindatagrams();
darran	0:ac21159e27f4	279	/* callback */
darran	0:ac21159e27f4	280	if (pcb->recv != NULL) {
darran	0:ac21159e27f4	281	/* now the recv function is responsible for freeing p */
darran	0:ac21159e27f4	282	pcb->recv(pcb->recv_arg, pcb, p, &iphdr->src, src);
darran	0:ac21159e27f4	283	} else {
darran	0:ac21159e27f4	284	/* no recv function registered? then we have to free the pbuf! */
darran	0:ac21159e27f4	285	pbuf_free(p);
darran	0:ac21159e27f4	286	goto end;
darran	0:ac21159e27f4	287	}
darran	0:ac21159e27f4	288	} else {
darran	0:ac21159e27f4	289	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
darran	0:ac21159e27f4	290
darran	0:ac21159e27f4	291	#if LWIP_ICMP
darran	0:ac21159e27f4	292	/* No match was found, send ICMP destination port unreachable unless
darran	0:ac21159e27f4	293	destination address was broadcast/multicast. */
darran	0:ac21159e27f4	294	if (!broadcast &&
darran	0:ac21159e27f4	295	!ip_addr_ismulticast(&iphdr->dest)) {
darran	0:ac21159e27f4	296	/* move payload pointer back to ip header */
darran	0:ac21159e27f4	297	pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
darran	0:ac21159e27f4	298	LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
darran	0:ac21159e27f4	299	icmp_dest_unreach(p, ICMP_DUR_PORT);
darran	0:ac21159e27f4	300	}
darran	0:ac21159e27f4	301	#endif /* LWIP_ICMP */
darran	0:ac21159e27f4	302	UDP_STATS_INC(udp.proterr);
darran	0:ac21159e27f4	303	UDP_STATS_INC(udp.drop);
darran	0:ac21159e27f4	304	snmp_inc_udpnoports();
darran	0:ac21159e27f4	305	pbuf_free(p);
darran	0:ac21159e27f4	306	}
darran	0:ac21159e27f4	307	} else {
darran	0:ac21159e27f4	308	pbuf_free(p);
darran	0:ac21159e27f4	309	}
darran	0:ac21159e27f4	310	end:
darran	0:ac21159e27f4	311	PERF_STOP("udp_input");
darran	0:ac21159e27f4	312	}
darran	0:ac21159e27f4	313
darran	0:ac21159e27f4	314	/**
darran	0:ac21159e27f4	315	* Send data using UDP.
darran	0:ac21159e27f4	316	*
darran	0:ac21159e27f4	317	* @param pcb UDP PCB used to send the data.
darran	0:ac21159e27f4	318	* @param p chain of pbuf's to be sent.
darran	0:ac21159e27f4	319	*
darran	0:ac21159e27f4	320	* The datagram will be sent to the current remote_ip & remote_port
darran	0:ac21159e27f4	321	* stored in pcb. If the pcb is not bound to a port, it will
darran	0:ac21159e27f4	322	* automatically be bound to a random port.
darran	0:ac21159e27f4	323	*
darran	0:ac21159e27f4	324	* @return lwIP error code.
darran	0:ac21159e27f4	325	* - ERR_OK. Successful. No error occured.
darran	0:ac21159e27f4	326	* - ERR_MEM. Out of memory.
darran	0:ac21159e27f4	327	* - ERR_RTE. Could not find route to destination address.
darran	0:ac21159e27f4	328	* - More errors could be returned by lower protocol layers.
darran	0:ac21159e27f4	329	*
darran	0:ac21159e27f4	330	* @see udp_disconnect() udp_sendto()
darran	0:ac21159e27f4	331	*/
darran	0:ac21159e27f4	332	err_t
darran	0:ac21159e27f4	333	udp_send(struct udp_pcb pcb, struct pbuf p)
darran	0:ac21159e27f4	334	{
darran	0:ac21159e27f4	335	/* send to the packet using remote ip and port stored in the pcb */
darran	0:ac21159e27f4	336	return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
darran	0:ac21159e27f4	337	}
darran	0:ac21159e27f4	338
darran	0:ac21159e27f4	339	/**
darran	0:ac21159e27f4	340	* Send data to a specified address using UDP.
darran	0:ac21159e27f4	341	*
darran	0:ac21159e27f4	342	* @param pcb UDP PCB used to send the data.
darran	0:ac21159e27f4	343	* @param p chain of pbuf's to be sent.
darran	0:ac21159e27f4	344	* @param dst_ip Destination IP address.
darran	0:ac21159e27f4	345	* @param dst_port Destination UDP port.
darran	0:ac21159e27f4	346	*
darran	0:ac21159e27f4	347	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
darran	0:ac21159e27f4	348	*
darran	0:ac21159e27f4	349	* If the PCB already has a remote address association, it will
darran	0:ac21159e27f4	350	* be restored after the data is sent.
darran	0:ac21159e27f4	351	*
darran	0:ac21159e27f4	352	* @return lwIP error code (@see udp_send for possible error codes)
darran	0:ac21159e27f4	353	*
darran	0:ac21159e27f4	354	* @see udp_disconnect() udp_send()
darran	0:ac21159e27f4	355	*/
darran	0:ac21159e27f4	356	err_t
darran	0:ac21159e27f4	357	udp_sendto(struct udp_pcb pcb, struct pbuf p,
darran	0:ac21159e27f4	358	ip_addr_t *dst_ip, u16_t dst_port)
darran	0:ac21159e27f4	359	{
darran	0:ac21159e27f4	360	struct netif *netif;
darran	0:ac21159e27f4	361
darran	0:ac21159e27f4	362	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send\n"));
darran	0:ac21159e27f4	363
darran	0:ac21159e27f4	364	/* find the outgoing network interface for this packet */
darran	0:ac21159e27f4	365	#if LWIP_IGMP
darran	0:ac21159e27f4	366	netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
darran	0:ac21159e27f4	367	#else
darran	0:ac21159e27f4	368	netif = ip_route(dst_ip);
darran	0:ac21159e27f4	369	#endif /* LWIP_IGMP */
darran	0:ac21159e27f4	370
darran	0:ac21159e27f4	371	/* no outgoing network interface could be found? */
darran	0:ac21159e27f4	372	if (netif == NULL) {
darran	0:ac21159e27f4	373	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
darran	0:ac21159e27f4	374	ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
darran	0:ac21159e27f4	375	UDP_STATS_INC(udp.rterr);
darran	0:ac21159e27f4	376	return ERR_RTE;
darran	0:ac21159e27f4	377	}
darran	0:ac21159e27f4	378	return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
darran	0:ac21159e27f4	379	}
darran	0:ac21159e27f4	380
darran	0:ac21159e27f4	381	/**
darran	0:ac21159e27f4	382	* Send data to a specified address using UDP.
darran	0:ac21159e27f4	383	* The netif used for sending can be specified.
darran	0:ac21159e27f4	384	*
darran	0:ac21159e27f4	385	* This function exists mainly for DHCP, to be able to send UDP packets
darran	0:ac21159e27f4	386	* on a netif that is still down.
darran	0:ac21159e27f4	387	*
darran	0:ac21159e27f4	388	* @param pcb UDP PCB used to send the data.
darran	0:ac21159e27f4	389	* @param p chain of pbuf's to be sent.
darran	0:ac21159e27f4	390	* @param dst_ip Destination IP address.
darran	0:ac21159e27f4	391	* @param dst_port Destination UDP port.
darran	0:ac21159e27f4	392	* @param netif the netif used for sending.
darran	0:ac21159e27f4	393	*
darran	0:ac21159e27f4	394	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
darran	0:ac21159e27f4	395	*
darran	0:ac21159e27f4	396	* @return lwIP error code (@see udp_send for possible error codes)
darran	0:ac21159e27f4	397	*
darran	0:ac21159e27f4	398	* @see udp_disconnect() udp_send()
darran	0:ac21159e27f4	399	*/
darran	0:ac21159e27f4	400	err_t
darran	0:ac21159e27f4	401	udp_sendto_if(struct udp_pcb pcb, struct pbuf p,
darran	0:ac21159e27f4	402	ip_addr_t dst_ip, u16_t dst_port, struct netif netif)
darran	0:ac21159e27f4	403	{
darran	0:ac21159e27f4	404	struct udp_hdr *udphdr;
darran	0:ac21159e27f4	405	ip_addr_t *src_ip;
darran	0:ac21159e27f4	406	err_t err;
darran	0:ac21159e27f4	407	struct pbuf q; / q will be sent down the stack */
darran	0:ac21159e27f4	408
darran	0:ac21159e27f4	409	#if IP_SOF_BROADCAST
darran	0:ac21159e27f4	410	/* broadcast filter? */
darran	0:ac21159e27f4	411	if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
darran	0:ac21159e27f4	412	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
darran	0:ac21159e27f4	413	("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
darran	0:ac21159e27f4	414	return ERR_VAL;
darran	0:ac21159e27f4	415	}
darran	0:ac21159e27f4	416	#endif /* IP_SOF_BROADCAST */
darran	0:ac21159e27f4	417
darran	0:ac21159e27f4	418	/* if the PCB is not yet bound to a port, bind it here */
darran	0:ac21159e27f4	419	if (pcb->local_port == 0) {
darran	0:ac21159e27f4	420	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
darran	0:ac21159e27f4	421	err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
darran	0:ac21159e27f4	422	if (err != ERR_OK) {
darran	0:ac21159e27f4	423	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
darran	0:ac21159e27f4	424	return err;
darran	0:ac21159e27f4	425	}
darran	0:ac21159e27f4	426	}
darran	0:ac21159e27f4	427
darran	0:ac21159e27f4	428	/* not enough space to add an UDP header to first pbuf in given p chain? */
darran	0:ac21159e27f4	429	if (pbuf_header(p, UDP_HLEN)) {
darran	0:ac21159e27f4	430	/* allocate header in a separate new pbuf */
darran	0:ac21159e27f4	431	q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
darran	0:ac21159e27f4	432	/* new header pbuf could not be allocated? */
darran	0:ac21159e27f4	433	if (q == NULL) {
darran	0:ac21159e27f4	434	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
darran	0:ac21159e27f4	435	return ERR_MEM;
darran	0:ac21159e27f4	436	}
darran	0:ac21159e27f4	437	/* chain header q in front of given pbuf p */
darran	0:ac21159e27f4	438	pbuf_chain(q, p);
darran	0:ac21159e27f4	439	/* first pbuf q points to header pbuf */
darran	0:ac21159e27f4	440	LWIP_DEBUGF(UDP_DEBUG,
darran	0:ac21159e27f4	441	("udp_send: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
darran	0:ac21159e27f4	442	} else {
darran	0:ac21159e27f4	443	/* adding space for header within p succeeded */
darran	0:ac21159e27f4	444	/* first pbuf q equals given pbuf */
darran	0:ac21159e27f4	445	q = p;
darran	0:ac21159e27f4	446	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
darran	0:ac21159e27f4	447	}
darran	0:ac21159e27f4	448	LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
darran	0:ac21159e27f4	449	(q->len >= sizeof(struct udp_hdr)));
darran	0:ac21159e27f4	450	/* q now represents the packet to be sent */
darran	0:ac21159e27f4	451	udphdr = (struct udp_hdr *)q->payload;
darran	0:ac21159e27f4	452	udphdr->src = htons(pcb->local_port);
darran	0:ac21159e27f4	453	udphdr->dest = htons(dst_port);
darran	0:ac21159e27f4	454	/* in UDP, 0 checksum means 'no checksum' */
darran	0:ac21159e27f4	455	udphdr->chksum = 0x0000;
darran	0:ac21159e27f4	456
darran	0:ac21159e27f4	457	/* PCB local address is IP_ANY_ADDR? */
darran	0:ac21159e27f4	458	if (ip_addr_isany(&pcb->local_ip)) {
darran	0:ac21159e27f4	459	/* use outgoing network interface IP address as source address */
darran	0:ac21159e27f4	460	src_ip = &(netif->ip_addr);
darran	0:ac21159e27f4	461	} else {
darran	0:ac21159e27f4	462	/* check if UDP PCB local IP address is correct
darran	0:ac21159e27f4	463	* this could be an old address if netif->ip_addr has changed */
darran	0:ac21159e27f4	464	if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
darran	0:ac21159e27f4	465	/* local_ip doesn't match, drop the packet */
darran	0:ac21159e27f4	466	if (q != p) {
darran	0:ac21159e27f4	467	/* free the header pbuf */
darran	0:ac21159e27f4	468	pbuf_free(q);
darran	0:ac21159e27f4	469	q = NULL;
darran	0:ac21159e27f4	470	/* p is still referenced by the caller, and will live on */
darran	0:ac21159e27f4	471	}
darran	0:ac21159e27f4	472	return ERR_VAL;
darran	0:ac21159e27f4	473	}
darran	0:ac21159e27f4	474	/* use UDP PCB local IP address as source address */
darran	0:ac21159e27f4	475	src_ip = &(pcb->local_ip);
darran	0:ac21159e27f4	476	}
darran	0:ac21159e27f4	477
darran	0:ac21159e27f4	478	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
darran	0:ac21159e27f4	479
darran	0:ac21159e27f4	480	#if LWIP_UDPLITE
darran	0:ac21159e27f4	481	/* UDP Lite protocol? */
darran	0:ac21159e27f4	482	if (pcb->flags & UDP_FLAGS_UDPLITE) {
darran	0:ac21159e27f4	483	u16_t chklen, chklen_hdr;
darran	0:ac21159e27f4	484	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
darran	0:ac21159e27f4	485	/* set UDP message length in UDP header */
darran	0:ac21159e27f4	486	chklen_hdr = chklen = pcb->chksum_len_tx;
darran	0:ac21159e27f4	487	if ((chklen < sizeof(struct udp_hdr)) \|\| (chklen > q->tot_len)) {
darran	0:ac21159e27f4	488	if (chklen != 0) {
darran	0:ac21159e27f4	489	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
darran	0:ac21159e27f4	490	}
darran	0:ac21159e27f4	491	/* For UDP-Lite, checksum length of 0 means checksum
darran	0:ac21159e27f4	492	over the complete packet. (See RFC 3828 chap. 3.1)
darran	0:ac21159e27f4	493	At least the UDP-Lite header must be covered by the
darran	0:ac21159e27f4	494	checksum, therefore, if chksum_len has an illegal
darran	0:ac21159e27f4	495	value, we generate the checksum over the complete
darran	0:ac21159e27f4	496	packet to be safe. */
darran	0:ac21159e27f4	497	chklen_hdr = 0;
darran	0:ac21159e27f4	498	chklen = q->tot_len;
darran	0:ac21159e27f4	499	}
darran	0:ac21159e27f4	500	udphdr->len = htons(chklen_hdr);
darran	0:ac21159e27f4	501	/* calculate checksum */
darran	0:ac21159e27f4	502	#if CHECKSUM_GEN_UDP
darran	0:ac21159e27f4	503	udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
darran	0:ac21159e27f4	504	IP_PROTO_UDPLITE, q->tot_len, chklen);
darran	0:ac21159e27f4	505	/* chksum zero must become 0xffff, as zero means 'no checksum' */
darran	0:ac21159e27f4	506	if (udphdr->chksum == 0x0000) {
darran	0:ac21159e27f4	507	udphdr->chksum = 0xffff;
darran	0:ac21159e27f4	508	}
darran	0:ac21159e27f4	509	#endif /* CHECKSUM_GEN_UDP */
darran	0:ac21159e27f4	510	/* output to IP */
darran	0:ac21159e27f4	511	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
darran	0:ac21159e27f4	512	#if LWIP_NETIF_HWADDRHINT
darran	0:ac21159e27f4	513	netif->addr_hint = &(pcb->addr_hint);
darran	0:ac21159e27f4	514	#endif /* LWIP_NETIF_HWADDRHINT*/
darran	0:ac21159e27f4	515	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
darran	0:ac21159e27f4	516	#if LWIP_NETIF_HWADDRHINT
darran	0:ac21159e27f4	517	netif->addr_hint = NULL;
darran	0:ac21159e27f4	518	#endif /* LWIP_NETIF_HWADDRHINT*/
darran	0:ac21159e27f4	519	} else
darran	0:ac21159e27f4	520	#endif /* LWIP_UDPLITE */
darran	0:ac21159e27f4	521	{ /* UDP */
darran	0:ac21159e27f4	522	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
darran	0:ac21159e27f4	523	udphdr->len = htons(q->tot_len);
darran	0:ac21159e27f4	524	/* calculate checksum */
darran	0:ac21159e27f4	525	#if CHECKSUM_GEN_UDP
darran	0:ac21159e27f4	526	if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
darran	0:ac21159e27f4	527	udphdr->chksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
darran	0:ac21159e27f4	528	/* chksum zero must become 0xffff, as zero means 'no checksum' */
darran	0:ac21159e27f4	529	if (udphdr->chksum == 0x0000) {
darran	0:ac21159e27f4	530	udphdr->chksum = 0xffff;
darran	0:ac21159e27f4	531	}
darran	0:ac21159e27f4	532	}
darran	0:ac21159e27f4	533	#endif /* CHECKSUM_GEN_UDP */
darran	0:ac21159e27f4	534	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
darran	0:ac21159e27f4	535	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
darran	0:ac21159e27f4	536	/* output to IP */
darran	0:ac21159e27f4	537	#if LWIP_NETIF_HWADDRHINT
darran	0:ac21159e27f4	538	netif->addr_hint = &(pcb->addr_hint);
darran	0:ac21159e27f4	539	#endif /* LWIP_NETIF_HWADDRHINT*/
darran	0:ac21159e27f4	540	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
darran	0:ac21159e27f4	541	#if LWIP_NETIF_HWADDRHINT
darran	0:ac21159e27f4	542	netif->addr_hint = NULL;
darran	0:ac21159e27f4	543	#endif /* LWIP_NETIF_HWADDRHINT*/
darran	0:ac21159e27f4	544	}
darran	0:ac21159e27f4	545	/* TODO: must this be increased even if error occured? */
darran	0:ac21159e27f4	546	snmp_inc_udpoutdatagrams();
darran	0:ac21159e27f4	547
darran	0:ac21159e27f4	548	/* did we chain a separate header pbuf earlier? */
darran	0:ac21159e27f4	549	if (q != p) {
darran	0:ac21159e27f4	550	/* free the header pbuf */
darran	0:ac21159e27f4	551	pbuf_free(q);
darran	0:ac21159e27f4	552	q = NULL;
darran	0:ac21159e27f4	553	/* p is still referenced by the caller, and will live on */
darran	0:ac21159e27f4	554	}
darran	0:ac21159e27f4	555
darran	0:ac21159e27f4	556	UDP_STATS_INC(udp.xmit);
darran	0:ac21159e27f4	557	return err;
darran	0:ac21159e27f4	558	}
darran	0:ac21159e27f4	559
darran	0:ac21159e27f4	560	/**
darran	0:ac21159e27f4	561	* Bind an UDP PCB.
darran	0:ac21159e27f4	562	*
darran	0:ac21159e27f4	563	* @param pcb UDP PCB to be bound with a local address ipaddr and port.
darran	0:ac21159e27f4	564	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
darran	0:ac21159e27f4	565	* bind to all local interfaces.
darran	0:ac21159e27f4	566	* @param port local UDP port to bind with. Use 0 to automatically bind
darran	0:ac21159e27f4	567	* to a random port between UDP_LOCAL_PORT_RANGE_START and
darran	0:ac21159e27f4	568	* UDP_LOCAL_PORT_RANGE_END.
darran	0:ac21159e27f4	569	*
darran	0:ac21159e27f4	570	* ipaddr & port are expected to be in the same byte order as in the pcb.
darran	0:ac21159e27f4	571	*
darran	0:ac21159e27f4	572	* @return lwIP error code.
darran	0:ac21159e27f4	573	* - ERR_OK. Successful. No error occured.
darran	0:ac21159e27f4	574	* - ERR_USE. The specified ipaddr and port are already bound to by
darran	0:ac21159e27f4	575	* another UDP PCB.
darran	0:ac21159e27f4	576	*
darran	0:ac21159e27f4	577	* @see udp_disconnect()
darran	0:ac21159e27f4	578	*/
darran	0:ac21159e27f4	579	err_t
darran	0:ac21159e27f4	580	udp_bind(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
darran	0:ac21159e27f4	581	{
darran	0:ac21159e27f4	582	struct udp_pcb *ipcb;
darran	0:ac21159e27f4	583	u8_t rebind;
darran	0:ac21159e27f4	584
darran	0:ac21159e27f4	585	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
darran	0:ac21159e27f4	586	ip_addr_debug_print(UDP_DEBUG, ipaddr);
darran	0:ac21159e27f4	587	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
darran	0:ac21159e27f4	588
darran	0:ac21159e27f4	589	rebind = 0;
darran	0:ac21159e27f4	590	/* Check for double bind and rebind of the same pcb */
darran	0:ac21159e27f4	591	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
darran	0:ac21159e27f4	592	/* is this UDP PCB already on active list? */
darran	0:ac21159e27f4	593	if (pcb == ipcb) {
darran	0:ac21159e27f4	594	/* pcb may occur at most once in active list */
darran	0:ac21159e27f4	595	LWIP_ASSERT("rebind == 0", rebind == 0);
darran	0:ac21159e27f4	596	/* pcb already in list, just rebind */
darran	0:ac21159e27f4	597	rebind = 1;
darran	0:ac21159e27f4	598	}
darran	0:ac21159e27f4	599
darran	0:ac21159e27f4	600	/* this code does not allow upper layer to share a UDP port for
darran	0:ac21159e27f4	601	listening to broadcast or multicast traffic (See SO_REUSEADDR and
darran	0:ac21159e27f4	602	SO_REUSEPORT under *BSD). TODO: See where it fits instead, OR
darran	0:ac21159e27f4	603	combine with implementation of UDP PCB flags. Leon Woestenberg. */
darran	0:ac21159e27f4	604	#ifdef LWIP_UDP_TODO
darran	0:ac21159e27f4	605	/* port matches that of PCB in list? */
darran	0:ac21159e27f4	606	else {
darran	0:ac21159e27f4	607	if ((ipcb->local_port == port) &&
darran	0:ac21159e27f4	608	/* IP address matches, or one is IP_ADDR_ANY? */
darran	0:ac21159e27f4	609	(ip_addr_isany(&(ipcb->local_ip)) \|\|
darran	0:ac21159e27f4	610	ip_addr_isany(ipaddr) \|\|
darran	0:ac21159e27f4	611	ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
darran	0:ac21159e27f4	612	/* other PCB already binds to this local IP and port */
darran	0:ac21159e27f4	613	LWIP_DEBUGF(UDP_DEBUG,
darran	0:ac21159e27f4	614	("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
darran	0:ac21159e27f4	615	return ERR_USE;
darran	0:ac21159e27f4	616	}
darran	0:ac21159e27f4	617	}
darran	0:ac21159e27f4	618	#endif
darran	0:ac21159e27f4	619	}
darran	0:ac21159e27f4	620
darran	0:ac21159e27f4	621	ip_addr_set(&pcb->local_ip, ipaddr);
darran	0:ac21159e27f4	622
darran	0:ac21159e27f4	623	/* no port specified? */
darran	0:ac21159e27f4	624	if (port == 0) {
darran	0:ac21159e27f4	625	#ifndef UDP_LOCAL_PORT_RANGE_START
darran	0:ac21159e27f4	626	#define UDP_LOCAL_PORT_RANGE_START 4096
darran	0:ac21159e27f4	627	#define UDP_LOCAL_PORT_RANGE_END 0x7fff
darran	0:ac21159e27f4	628	#endif
darran	0:ac21159e27f4	629	port = UDP_LOCAL_PORT_RANGE_START;
darran	0:ac21159e27f4	630	ipcb = udp_pcbs;
darran	0:ac21159e27f4	631	while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
darran	0:ac21159e27f4	632	if (ipcb->local_port == port) {
darran	0:ac21159e27f4	633	/* port is already used by another udp_pcb */
darran	0:ac21159e27f4	634	port++;
darran	0:ac21159e27f4	635	/* restart scanning all udp pcbs */
darran	0:ac21159e27f4	636	ipcb = udp_pcbs;
darran	0:ac21159e27f4	637	} else {
darran	0:ac21159e27f4	638	/* go on with next udp pcb */
darran	0:ac21159e27f4	639	ipcb = ipcb->next;
darran	0:ac21159e27f4	640	}
darran	0:ac21159e27f4	641	}
darran	0:ac21159e27f4	642	if (ipcb != NULL) {
darran	0:ac21159e27f4	643	/* no more ports available in local range */
darran	0:ac21159e27f4	644	LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
darran	0:ac21159e27f4	645	return ERR_USE;
darran	0:ac21159e27f4	646	}
darran	0:ac21159e27f4	647	}
darran	0:ac21159e27f4	648	pcb->local_port = port;
darran	0:ac21159e27f4	649	snmp_insert_udpidx_tree(pcb);
darran	0:ac21159e27f4	650	/* pcb not active yet? */
darran	0:ac21159e27f4	651	if (rebind == 0) {
darran	0:ac21159e27f4	652	/* place the PCB on the active list if not already there */
darran	0:ac21159e27f4	653	pcb->next = udp_pcbs;
darran	0:ac21159e27f4	654	udp_pcbs = pcb;
darran	0:ac21159e27f4	655	}
darran	0:ac21159e27f4	656	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:ac21159e27f4	657	("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
darran	0:ac21159e27f4	658	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
darran	0:ac21159e27f4	659	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
darran	0:ac21159e27f4	660	pcb->local_port));
darran	0:ac21159e27f4	661	return ERR_OK;
darran	0:ac21159e27f4	662	}
darran	0:ac21159e27f4	663	/**
darran	0:ac21159e27f4	664	* Connect an UDP PCB.
darran	0:ac21159e27f4	665	*
darran	0:ac21159e27f4	666	* This will associate the UDP PCB with the remote address.
darran	0:ac21159e27f4	667	*
darran	0:ac21159e27f4	668	* @param pcb UDP PCB to be connected with remote address ipaddr and port.
darran	0:ac21159e27f4	669	* @param ipaddr remote IP address to connect with.
darran	0:ac21159e27f4	670	* @param port remote UDP port to connect with.
darran	0:ac21159e27f4	671	*
darran	0:ac21159e27f4	672	* @return lwIP error code
darran	0:ac21159e27f4	673	*
darran	0:ac21159e27f4	674	* ipaddr & port are expected to be in the same byte order as in the pcb.
darran	0:ac21159e27f4	675	*
darran	0:ac21159e27f4	676	* The udp pcb is bound to a random local port if not already bound.
darran	0:ac21159e27f4	677	*
darran	0:ac21159e27f4	678	* @see udp_disconnect()
darran	0:ac21159e27f4	679	*/
darran	0:ac21159e27f4	680	err_t
darran	0:ac21159e27f4	681	udp_connect(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
darran	0:ac21159e27f4	682	{
darran	0:ac21159e27f4	683	struct udp_pcb *ipcb;
darran	0:ac21159e27f4	684
darran	0:ac21159e27f4	685	if (pcb->local_port == 0) {
darran	0:ac21159e27f4	686	err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
darran	0:ac21159e27f4	687	if (err != ERR_OK) {
darran	0:ac21159e27f4	688	return err;
darran	0:ac21159e27f4	689	}
darran	0:ac21159e27f4	690	}
darran	0:ac21159e27f4	691
darran	0:ac21159e27f4	692	ip_addr_set(&pcb->remote_ip, ipaddr);
darran	0:ac21159e27f4	693	pcb->remote_port = port;
darran	0:ac21159e27f4	694	pcb->flags \|= UDP_FLAGS_CONNECTED;
darran	0:ac21159e27f4	695	/** TODO: this functionality belongs in upper layers */
darran	0:ac21159e27f4	696	#ifdef LWIP_UDP_TODO
darran	0:ac21159e27f4	697	/* Nail down local IP for netconn_addr()/getsockname() */
darran	0:ac21159e27f4	698	if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
darran	0:ac21159e27f4	699	struct netif *netif;
darran	0:ac21159e27f4	700
darran	0:ac21159e27f4	701	if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
darran	0:ac21159e27f4	702	LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
darran	0:ac21159e27f4	703	UDP_STATS_INC(udp.rterr);
darran	0:ac21159e27f4	704	return ERR_RTE;
darran	0:ac21159e27f4	705	}
darran	0:ac21159e27f4	706	/** TODO: this will bind the udp pcb locally, to the interface which
darran	0:ac21159e27f4	707	is used to route output packets to the remote address. However, we
darran	0:ac21159e27f4	708	might want to accept incoming packets on any interface! */
darran	0:ac21159e27f4	709	pcb->local_ip = netif->ip_addr;
darran	0:ac21159e27f4	710	} else if (ip_addr_isany(&pcb->remote_ip)) {
darran	0:ac21159e27f4	711	pcb->local_ip.addr = 0;
darran	0:ac21159e27f4	712	}
darran	0:ac21159e27f4	713	#endif
darran	0:ac21159e27f4	714	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
darran	0:ac21159e27f4	715	("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
darran	0:ac21159e27f4	716	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
darran	0:ac21159e27f4	717	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
darran	0:ac21159e27f4	718	pcb->local_port));
darran	0:ac21159e27f4	719
darran	0:ac21159e27f4	720	/* Insert UDP PCB into the list of active UDP PCBs. */
darran	0:ac21159e27f4	721	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
darran	0:ac21159e27f4	722	if (pcb == ipcb) {
darran	0:ac21159e27f4	723	/* already on the list, just return */
darran	0:ac21159e27f4	724	return ERR_OK;
darran	0:ac21159e27f4	725	}
darran	0:ac21159e27f4	726	}
darran	0:ac21159e27f4	727	/* PCB not yet on the list, add PCB now */
darran	0:ac21159e27f4	728	pcb->next = udp_pcbs;
darran	0:ac21159e27f4	729	udp_pcbs = pcb;
darran	0:ac21159e27f4	730	return ERR_OK;
darran	0:ac21159e27f4	731	}
darran	0:ac21159e27f4	732
darran	0:ac21159e27f4	733	/**
darran	0:ac21159e27f4	734	* Disconnect a UDP PCB
darran	0:ac21159e27f4	735	*
darran	0:ac21159e27f4	736	* @param pcb the udp pcb to disconnect.
darran	0:ac21159e27f4	737	*/
darran	0:ac21159e27f4	738	void
darran	0:ac21159e27f4	739	udp_disconnect(struct udp_pcb *pcb)
darran	0:ac21159e27f4	740	{
darran	0:ac21159e27f4	741	/* reset remote address association */
darran	0:ac21159e27f4	742	ip_addr_set_any(&pcb->remote_ip);
darran	0:ac21159e27f4	743	pcb->remote_port = 0;
darran	0:ac21159e27f4	744	/* mark PCB as unconnected */
darran	0:ac21159e27f4	745	pcb->flags &= ~UDP_FLAGS_CONNECTED;
darran	0:ac21159e27f4	746	}
darran	0:ac21159e27f4	747
darran	0:ac21159e27f4	748	/**
darran	0:ac21159e27f4	749	* Set a receive callback for a UDP PCB
darran	0:ac21159e27f4	750	*
darran	0:ac21159e27f4	751	* This callback will be called when receiving a datagram for the pcb.
darran	0:ac21159e27f4	752	*
darran	0:ac21159e27f4	753	* @param pcb the pcb for wich to set the recv callback
darran	0:ac21159e27f4	754	* @param recv function pointer of the callback function
darran	0:ac21159e27f4	755	* @param recv_arg additional argument to pass to the callback function
darran	0:ac21159e27f4	756	*/
darran	0:ac21159e27f4	757	void
darran	0:ac21159e27f4	758	udp_recv(struct udp_pcb pcb, udp_recv_fn recv, void recv_arg)
darran	0:ac21159e27f4	759	{
darran	0:ac21159e27f4	760	/* remember recv() callback and user data */
darran	0:ac21159e27f4	761	pcb->recv = recv;
darran	0:ac21159e27f4	762	pcb->recv_arg = recv_arg;
darran	0:ac21159e27f4	763	}
darran	0:ac21159e27f4	764
darran	0:ac21159e27f4	765	/**
darran	0:ac21159e27f4	766	* Remove an UDP PCB.
darran	0:ac21159e27f4	767	*
darran	0:ac21159e27f4	768	* @param pcb UDP PCB to be removed. The PCB is removed from the list of
darran	0:ac21159e27f4	769	* UDP PCB's and the data structure is freed from memory.
darran	0:ac21159e27f4	770	*
darran	0:ac21159e27f4	771	* @see udp_new()
darran	0:ac21159e27f4	772	*/
darran	0:ac21159e27f4	773	void
darran	0:ac21159e27f4	774	udp_remove(struct udp_pcb *pcb)
darran	0:ac21159e27f4	775	{
darran	0:ac21159e27f4	776	struct udp_pcb *pcb2;
darran	0:ac21159e27f4	777
darran	0:ac21159e27f4	778	snmp_delete_udpidx_tree(pcb);
darran	0:ac21159e27f4	779	/* pcb to be removed is first in list? */
darran	0:ac21159e27f4	780	if (udp_pcbs == pcb) {
darran	0:ac21159e27f4	781	/* make list start at 2nd pcb */
darran	0:ac21159e27f4	782	udp_pcbs = udp_pcbs->next;
darran	0:ac21159e27f4	783	/* pcb not 1st in list */
darran	0:ac21159e27f4	784	} else {
darran	0:ac21159e27f4	785	for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
darran	0:ac21159e27f4	786	/* find pcb in udp_pcbs list */
darran	0:ac21159e27f4	787	if (pcb2->next != NULL && pcb2->next == pcb) {
darran	0:ac21159e27f4	788	/* remove pcb from list */
darran	0:ac21159e27f4	789	pcb2->next = pcb->next;
darran	0:ac21159e27f4	790	}
darran	0:ac21159e27f4	791	}
darran	0:ac21159e27f4	792	}
darran	0:ac21159e27f4	793	memp_free(MEMP_UDP_PCB, pcb);
darran	0:ac21159e27f4	794	}
darran	0:ac21159e27f4	795
darran	0:ac21159e27f4	796	/**
darran	0:ac21159e27f4	797	* Create a UDP PCB.
darran	0:ac21159e27f4	798	*
darran	0:ac21159e27f4	799	* @return The UDP PCB which was created. NULL if the PCB data structure
darran	0:ac21159e27f4	800	* could not be allocated.
darran	0:ac21159e27f4	801	*
darran	0:ac21159e27f4	802	* @see udp_remove()
darran	0:ac21159e27f4	803	*/
darran	0:ac21159e27f4	804	struct udp_pcb *
darran	0:ac21159e27f4	805	udp_new(void)
darran	0:ac21159e27f4	806	{
darran	0:ac21159e27f4	807	struct udp_pcb *pcb;
darran	0:ac21159e27f4	808	pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
darran	0:ac21159e27f4	809	/* could allocate UDP PCB? */
darran	0:ac21159e27f4	810	if (pcb != NULL) {
darran	0:ac21159e27f4	811	/* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
darran	0:ac21159e27f4	812	* which means checksum is generated over the whole datagram per default
darran	0:ac21159e27f4	813	* (recommended as default by RFC 3828). */
darran	0:ac21159e27f4	814	/* initialize PCB to all zeroes */
darran	0:ac21159e27f4	815	memset(pcb, 0, sizeof(struct udp_pcb));
darran	0:ac21159e27f4	816	pcb->ttl = UDP_TTL;
darran	0:ac21159e27f4	817	}
darran	0:ac21159e27f4	818	return pcb;
darran	0:ac21159e27f4	819	}
darran	0:ac21159e27f4	820
darran	0:ac21159e27f4	821	#if UDP_DEBUG
darran	0:ac21159e27f4	822	/**
darran	0:ac21159e27f4	823	* Print UDP header information for debug purposes.
darran	0:ac21159e27f4	824	*
darran	0:ac21159e27f4	825	* @param udphdr pointer to the udp header in memory.
darran	0:ac21159e27f4	826	*/
darran	0:ac21159e27f4	827	void
darran	0:ac21159e27f4	828	udp_debug_print(struct udp_hdr *udphdr)
darran	0:ac21159e27f4	829	{
darran	0:ac21159e27f4	830	LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
darran	0:ac21159e27f4	831	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
darran	0:ac21159e27f4	832	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
darran	0:ac21159e27f4	833	ntohs(udphdr->src), ntohs(udphdr->dest)));
darran	0:ac21159e27f4	834	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
darran	0:ac21159e27f4	835	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| 0x%04"X16_F" \| (len, chksum)\n",
darran	0:ac21159e27f4	836	ntohs(udphdr->len), ntohs(udphdr->chksum)));
darran	0:ac21159e27f4	837	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
darran	0:ac21159e27f4	838	}
darran	0:ac21159e27f4	839	#endif /* UDP_DEBUG */
darran	0:ac21159e27f4	840
darran	0:ac21159e27f4	841	#endif /* LWIP_UDP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	02 Jul 2010
Imports:	2
Forks:	0
Commits:	1
Dependents:	0
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lwip/core/udp.c@0:ac21159e27f4, 2010-07-02 (annotated)

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