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

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

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

Who changed what in which revision?

User	Revision	Line number	New contents of line
idinor	0:dcf3c92487ca	1	/**
idinor	0:dcf3c92487ca	2	* @file
idinor	0:dcf3c92487ca	3	* User Datagram Protocol module
idinor	0:dcf3c92487ca	4	*
idinor	0:dcf3c92487ca	5	*/
idinor	0:dcf3c92487ca	6
idinor	0:dcf3c92487ca	7	/*
idinor	0:dcf3c92487ca	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
idinor	0:dcf3c92487ca	9	* All rights reserved.
idinor	0:dcf3c92487ca	10	*
idinor	0:dcf3c92487ca	11	* Redistribution and use in source and binary forms, with or without modification,
idinor	0:dcf3c92487ca	12	* are permitted provided that the following conditions are met:
idinor	0:dcf3c92487ca	13	*
idinor	0:dcf3c92487ca	14	* 1. Redistributions of source code must retain the above copyright notice,
idinor	0:dcf3c92487ca	15	* this list of conditions and the following disclaimer.
idinor	0:dcf3c92487ca	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
idinor	0:dcf3c92487ca	17	* this list of conditions and the following disclaimer in the documentation
idinor	0:dcf3c92487ca	18	* and/or other materials provided with the distribution.
idinor	0:dcf3c92487ca	19	* 3. The name of the author may not be used to endorse or promote products
idinor	0:dcf3c92487ca	20	* derived from this software without specific prior written permission.
idinor	0:dcf3c92487ca	21	*
idinor	0:dcf3c92487ca	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
idinor	0:dcf3c92487ca	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
idinor	0:dcf3c92487ca	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
idinor	0:dcf3c92487ca	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
idinor	0:dcf3c92487ca	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
idinor	0:dcf3c92487ca	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
idinor	0:dcf3c92487ca	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
idinor	0:dcf3c92487ca	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
idinor	0:dcf3c92487ca	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
idinor	0:dcf3c92487ca	31	* OF SUCH DAMAGE.
idinor	0:dcf3c92487ca	32	*
idinor	0:dcf3c92487ca	33	* This file is part of the lwIP TCP/IP stack.
idinor	0:dcf3c92487ca	34	*
idinor	0:dcf3c92487ca	35	* Author: Adam Dunkels <adam@sics.se>
idinor	0:dcf3c92487ca	36	*
idinor	0:dcf3c92487ca	37	*/
idinor	0:dcf3c92487ca	38
idinor	0:dcf3c92487ca	39
idinor	0:dcf3c92487ca	40	/* udp.c
idinor	0:dcf3c92487ca	41	*
idinor	0:dcf3c92487ca	42	* The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
idinor	0:dcf3c92487ca	43	*
idinor	0:dcf3c92487ca	44	*/
idinor	0:dcf3c92487ca	45
idinor	0:dcf3c92487ca	46	/* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
idinor	0:dcf3c92487ca	47	*/
idinor	0:dcf3c92487ca	48
idinor	0:dcf3c92487ca	49	#include "lwip/opt.h"
idinor	0:dcf3c92487ca	50
idinor	0:dcf3c92487ca	51	#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
idinor	0:dcf3c92487ca	52
idinor	0:dcf3c92487ca	53	#include "lwip/udp.h"
idinor	0:dcf3c92487ca	54	#include "lwip/def.h"
idinor	0:dcf3c92487ca	55	#include "lwip/memp.h"
idinor	0:dcf3c92487ca	56	#include "lwip/inet_chksum.h"
idinor	0:dcf3c92487ca	57	#include "lwip/ip_addr.h"
idinor	0:dcf3c92487ca	58	#include "lwip/netif.h"
idinor	0:dcf3c92487ca	59	#include "lwip/icmp.h"
idinor	0:dcf3c92487ca	60	#include "lwip/stats.h"
idinor	0:dcf3c92487ca	61	#include "lwip/snmp.h"
idinor	0:dcf3c92487ca	62	#include "arch/perf.h"
idinor	0:dcf3c92487ca	63	#include "lwip/dhcp.h"
idinor	0:dcf3c92487ca	64
idinor	0:dcf3c92487ca	65	#include <string.h>
idinor	0:dcf3c92487ca	66
idinor	0:dcf3c92487ca	67	/* The list of UDP PCBs */
idinor	0:dcf3c92487ca	68	/* exported in udp.h (was static) */
idinor	0:dcf3c92487ca	69	struct udp_pcb *udp_pcbs;
idinor	0:dcf3c92487ca	70
idinor	0:dcf3c92487ca	71	/**
idinor	0:dcf3c92487ca	72	* Process an incoming UDP datagram.
idinor	0:dcf3c92487ca	73	*
idinor	0:dcf3c92487ca	74	* Given an incoming UDP datagram (as a chain of pbufs) this function
idinor	0:dcf3c92487ca	75	* finds a corresponding UDP PCB and hands over the pbuf to the pcbs
idinor	0:dcf3c92487ca	76	* recv function. If no pcb is found or the datagram is incorrect, the
idinor	0:dcf3c92487ca	77	* pbuf is freed.
idinor	0:dcf3c92487ca	78	*
idinor	0:dcf3c92487ca	79	* @param p pbuf to be demultiplexed to a UDP PCB.
idinor	0:dcf3c92487ca	80	* @param inp network interface on which the datagram was received.
idinor	0:dcf3c92487ca	81	*
idinor	0:dcf3c92487ca	82	*/
idinor	0:dcf3c92487ca	83	void
idinor	0:dcf3c92487ca	84	udp_input(struct pbuf p, struct netif inp)
idinor	0:dcf3c92487ca	85	{
idinor	0:dcf3c92487ca	86	struct udp_hdr *udphdr;
idinor	0:dcf3c92487ca	87	struct udp_pcb pcb, prev;
idinor	0:dcf3c92487ca	88	struct udp_pcb *uncon_pcb;
idinor	0:dcf3c92487ca	89	struct ip_hdr *iphdr;
idinor	0:dcf3c92487ca	90	u16_t src, dest;
idinor	0:dcf3c92487ca	91	u8_t local_match;
idinor	0:dcf3c92487ca	92	u8_t broadcast;
idinor	0:dcf3c92487ca	93
idinor	0:dcf3c92487ca	94	PERF_START;
idinor	0:dcf3c92487ca	95
idinor	0:dcf3c92487ca	96	UDP_STATS_INC(udp.recv);
idinor	0:dcf3c92487ca	97
idinor	0:dcf3c92487ca	98	iphdr = (struct ip_hdr *)p->payload;
idinor	0:dcf3c92487ca	99
idinor	0:dcf3c92487ca	100	/* Check minimum length (IP header + UDP header)
idinor	0:dcf3c92487ca	101	* and move payload pointer to UDP header */
idinor	0:dcf3c92487ca	102	if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) \|\| pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
idinor	0:dcf3c92487ca	103	/* drop short packets */
idinor	0:dcf3c92487ca	104	LWIP_DEBUGF(UDP_DEBUG,
idinor	0:dcf3c92487ca	105	("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
idinor	0:dcf3c92487ca	106	UDP_STATS_INC(udp.lenerr);
idinor	0:dcf3c92487ca	107	UDP_STATS_INC(udp.drop);
idinor	0:dcf3c92487ca	108	snmp_inc_udpinerrors();
idinor	0:dcf3c92487ca	109	pbuf_free(p);
idinor	0:dcf3c92487ca	110	goto end;
idinor	0:dcf3c92487ca	111	}
idinor	0:dcf3c92487ca	112
idinor	0:dcf3c92487ca	113	udphdr = (struct udp_hdr *)p->payload;
idinor	0:dcf3c92487ca	114
idinor	0:dcf3c92487ca	115	/* is broadcast packet ? */
idinor	0:dcf3c92487ca	116	broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
idinor	0:dcf3c92487ca	117
idinor	0:dcf3c92487ca	118	LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
idinor	0:dcf3c92487ca	119
idinor	0:dcf3c92487ca	120	/* convert src and dest ports to host byte order */
idinor	0:dcf3c92487ca	121	src = ntohs(udphdr->src);
idinor	0:dcf3c92487ca	122	dest = ntohs(udphdr->dest);
idinor	0:dcf3c92487ca	123
idinor	0:dcf3c92487ca	124	udp_debug_print(udphdr);
idinor	0:dcf3c92487ca	125
idinor	0:dcf3c92487ca	126	/* print the UDP source and destination */
idinor	0:dcf3c92487ca	127	LWIP_DEBUGF(UDP_DEBUG,
idinor	0:dcf3c92487ca	128	("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
idinor	0:dcf3c92487ca	129	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
idinor	0:dcf3c92487ca	130	ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
idinor	0:dcf3c92487ca	131	ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
idinor	0:dcf3c92487ca	132	ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
idinor	0:dcf3c92487ca	133	ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
idinor	0:dcf3c92487ca	134
idinor	0:dcf3c92487ca	135	#if LWIP_DHCP
idinor	0:dcf3c92487ca	136	pcb = NULL;
idinor	0:dcf3c92487ca	137	/* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
idinor	0:dcf3c92487ca	138	the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
idinor	0:dcf3c92487ca	139	if (dest == DHCP_CLIENT_PORT) {
idinor	0:dcf3c92487ca	140	/* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
idinor	0:dcf3c92487ca	141	if (src == DHCP_SERVER_PORT) {
idinor	0:dcf3c92487ca	142	if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
idinor	0:dcf3c92487ca	143	/* accept the packe if
idinor	0:dcf3c92487ca	144	(- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
idinor	0:dcf3c92487ca	145	- inp->dhcp->pcb->remote == ANY or iphdr->src */
idinor	0:dcf3c92487ca	146	if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) \|\|
idinor	0:dcf3c92487ca	147	ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
idinor	0:dcf3c92487ca	148	pcb = inp->dhcp->pcb;
idinor	0:dcf3c92487ca	149	}
idinor	0:dcf3c92487ca	150	}
idinor	0:dcf3c92487ca	151	}
idinor	0:dcf3c92487ca	152	} else
idinor	0:dcf3c92487ca	153	#endif /* LWIP_DHCP */
idinor	0:dcf3c92487ca	154	{
idinor	0:dcf3c92487ca	155	prev = NULL;
idinor	0:dcf3c92487ca	156	local_match = 0;
idinor	0:dcf3c92487ca	157	uncon_pcb = NULL;
idinor	0:dcf3c92487ca	158	/* Iterate through the UDP pcb list for a matching pcb.
idinor	0:dcf3c92487ca	159	* 'Perfect match' pcbs (connected to the remote port & ip address) are
idinor	0:dcf3c92487ca	160	* preferred. If no perfect match is found, the first unconnected pcb that
idinor	0:dcf3c92487ca	161	* matches the local port and ip address gets the datagram. */
idinor	0:dcf3c92487ca	162	for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
idinor	0:dcf3c92487ca	163	local_match = 0;
idinor	0:dcf3c92487ca	164	/* print the PCB local and remote address */
idinor	0:dcf3c92487ca	165	LWIP_DEBUGF(UDP_DEBUG,
idinor	0:dcf3c92487ca	166	("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
idinor	0:dcf3c92487ca	167	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
idinor	0:dcf3c92487ca	168	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
idinor	0:dcf3c92487ca	169	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
idinor	0:dcf3c92487ca	170	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
idinor	0:dcf3c92487ca	171	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
idinor	0:dcf3c92487ca	172
idinor	0:dcf3c92487ca	173	/* compare PCB local addr+port to UDP destination addr+port */
idinor	0:dcf3c92487ca	174	if ((pcb->local_port == dest) &&
idinor	0:dcf3c92487ca	175	((!broadcast && ip_addr_isany(&pcb->local_ip)) \|\|
idinor	0:dcf3c92487ca	176	ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) \|\|
idinor	0:dcf3c92487ca	177	#if LWIP_IGMP
idinor	0:dcf3c92487ca	178	ip_addr_ismulticast(&current_iphdr_dest) \|\|
idinor	0:dcf3c92487ca	179	#endif /* LWIP_IGMP */
idinor	0:dcf3c92487ca	180	#if IP_SOF_BROADCAST_RECV
idinor	0:dcf3c92487ca	181	(broadcast && (pcb->so_options & SOF_BROADCAST)))) {
idinor	0:dcf3c92487ca	182	#else /* IP_SOF_BROADCAST_RECV */
idinor	0:dcf3c92487ca	183	(broadcast))) {
idinor	0:dcf3c92487ca	184	#endif /* IP_SOF_BROADCAST_RECV */
idinor	0:dcf3c92487ca	185	local_match = 1;
idinor	0:dcf3c92487ca	186	if ((uncon_pcb == NULL) &&
idinor	0:dcf3c92487ca	187	((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
idinor	0:dcf3c92487ca	188	/* the first unconnected matching PCB */
idinor	0:dcf3c92487ca	189	uncon_pcb = pcb;
idinor	0:dcf3c92487ca	190	}
idinor	0:dcf3c92487ca	191	}
idinor	0:dcf3c92487ca	192	/* compare PCB remote addr+port to UDP source addr+port */
idinor	0:dcf3c92487ca	193	if ((local_match != 0) &&
idinor	0:dcf3c92487ca	194	(pcb->remote_port == src) &&
idinor	0:dcf3c92487ca	195	(ip_addr_isany(&pcb->remote_ip) \|\|
idinor	0:dcf3c92487ca	196	ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
idinor	0:dcf3c92487ca	197	/* the first fully matching PCB */
idinor	0:dcf3c92487ca	198	if (prev != NULL) {
idinor	0:dcf3c92487ca	199	/* move the pcb to the front of udp_pcbs so that is
idinor	0:dcf3c92487ca	200	found faster next time */
idinor	0:dcf3c92487ca	201	prev->next = pcb->next;
idinor	0:dcf3c92487ca	202	pcb->next = udp_pcbs;
idinor	0:dcf3c92487ca	203	udp_pcbs = pcb;
idinor	0:dcf3c92487ca	204	} else {
idinor	0:dcf3c92487ca	205	UDP_STATS_INC(udp.cachehit);
idinor	0:dcf3c92487ca	206	}
idinor	0:dcf3c92487ca	207	break;
idinor	0:dcf3c92487ca	208	}
idinor	0:dcf3c92487ca	209	prev = pcb;
idinor	0:dcf3c92487ca	210	}
idinor	0:dcf3c92487ca	211	/* no fully matching pcb found? then look for an unconnected pcb */
idinor	0:dcf3c92487ca	212	if (pcb == NULL) {
idinor	0:dcf3c92487ca	213	pcb = uncon_pcb;
idinor	0:dcf3c92487ca	214	}
idinor	0:dcf3c92487ca	215	}
idinor	0:dcf3c92487ca	216
idinor	0:dcf3c92487ca	217	/* Check checksum if this is a match or if it was directed at us. */
idinor	0:dcf3c92487ca	218	if (pcb != NULL \|\| ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
idinor	0:dcf3c92487ca	219	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
idinor	0:dcf3c92487ca	220	#if LWIP_UDPLITE
idinor	0:dcf3c92487ca	221	if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
idinor	0:dcf3c92487ca	222	/* Do the UDP Lite checksum */
idinor	0:dcf3c92487ca	223	#if CHECKSUM_CHECK_UDP
idinor	0:dcf3c92487ca	224	u16_t chklen = ntohs(udphdr->len);
idinor	0:dcf3c92487ca	225	if (chklen < sizeof(struct udp_hdr)) {
idinor	0:dcf3c92487ca	226	if (chklen == 0) {
idinor	0:dcf3c92487ca	227	/* For UDP-Lite, checksum length of 0 means checksum
idinor	0:dcf3c92487ca	228	over the complete packet (See RFC 3828 chap. 3.1) */
idinor	0:dcf3c92487ca	229	chklen = p->tot_len;
idinor	0:dcf3c92487ca	230	} else {
idinor	0:dcf3c92487ca	231	/* At least the UDP-Lite header must be covered by the
idinor	0:dcf3c92487ca	232	checksum! (Again, see RFC 3828 chap. 3.1) */
idinor	0:dcf3c92487ca	233	UDP_STATS_INC(udp.chkerr);
idinor	0:dcf3c92487ca	234	UDP_STATS_INC(udp.drop);
idinor	0:dcf3c92487ca	235	snmp_inc_udpinerrors();
idinor	0:dcf3c92487ca	236	pbuf_free(p);
idinor	0:dcf3c92487ca	237	goto end;
idinor	0:dcf3c92487ca	238	}
idinor	0:dcf3c92487ca	239	}
idinor	0:dcf3c92487ca	240	if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
idinor	0:dcf3c92487ca	241	IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
idinor	0:dcf3c92487ca	242	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
idinor	0:dcf3c92487ca	243	("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
idinor	0:dcf3c92487ca	244	UDP_STATS_INC(udp.chkerr);
idinor	0:dcf3c92487ca	245	UDP_STATS_INC(udp.drop);
idinor	0:dcf3c92487ca	246	snmp_inc_udpinerrors();
idinor	0:dcf3c92487ca	247	pbuf_free(p);
idinor	0:dcf3c92487ca	248	goto end;
idinor	0:dcf3c92487ca	249	}
idinor	0:dcf3c92487ca	250	#endif /* CHECKSUM_CHECK_UDP */
idinor	0:dcf3c92487ca	251	} else
idinor	0:dcf3c92487ca	252	#endif /* LWIP_UDPLITE */
idinor	0:dcf3c92487ca	253	{
idinor	0:dcf3c92487ca	254	#if CHECKSUM_CHECK_UDP
idinor	0:dcf3c92487ca	255	if (udphdr->chksum != 0) {
idinor	0:dcf3c92487ca	256	if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
idinor	0:dcf3c92487ca	257	IP_PROTO_UDP, p->tot_len) != 0) {
idinor	0:dcf3c92487ca	258	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
idinor	0:dcf3c92487ca	259	("udp_input: UDP datagram discarded due to failing checksum\n"));
idinor	0:dcf3c92487ca	260	UDP_STATS_INC(udp.chkerr);
idinor	0:dcf3c92487ca	261	UDP_STATS_INC(udp.drop);
idinor	0:dcf3c92487ca	262	snmp_inc_udpinerrors();
idinor	0:dcf3c92487ca	263	pbuf_free(p);
idinor	0:dcf3c92487ca	264	goto end;
idinor	0:dcf3c92487ca	265	}
idinor	0:dcf3c92487ca	266	}
idinor	0:dcf3c92487ca	267	#endif /* CHECKSUM_CHECK_UDP */
idinor	0:dcf3c92487ca	268	}
idinor	0:dcf3c92487ca	269	if(pbuf_header(p, -UDP_HLEN)) {
idinor	0:dcf3c92487ca	270	/* Can we cope with this failing? Just assert for now */
idinor	0:dcf3c92487ca	271	LWIP_ASSERT("pbuf_header failed\n", 0);
idinor	0:dcf3c92487ca	272	UDP_STATS_INC(udp.drop);
idinor	0:dcf3c92487ca	273	snmp_inc_udpinerrors();
idinor	0:dcf3c92487ca	274	pbuf_free(p);
idinor	0:dcf3c92487ca	275	goto end;
idinor	0:dcf3c92487ca	276	}
idinor	0:dcf3c92487ca	277	if (pcb != NULL) {
idinor	0:dcf3c92487ca	278	snmp_inc_udpindatagrams();
idinor	0:dcf3c92487ca	279	#if SO_REUSE && SO_REUSE_RXTOALL
idinor	0:dcf3c92487ca	280	if ((broadcast \|\| ip_addr_ismulticast(&current_iphdr_dest)) &&
idinor	0:dcf3c92487ca	281	((pcb->so_options & SOF_REUSEADDR) != 0)) {
idinor	0:dcf3c92487ca	282	/* pass broadcast- or multicast packets to all multicast pcbs
idinor	0:dcf3c92487ca	283	if SOF_REUSEADDR is set on the first match */
idinor	0:dcf3c92487ca	284	struct udp_pcb *mpcb;
idinor	0:dcf3c92487ca	285	u8_t p_header_changed = 0;
idinor	0:dcf3c92487ca	286	for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
idinor	0:dcf3c92487ca	287	if (mpcb != pcb) {
idinor	0:dcf3c92487ca	288	/* compare PCB local addr+port to UDP destination addr+port */
idinor	0:dcf3c92487ca	289	if ((mpcb->local_port == dest) &&
idinor	0:dcf3c92487ca	290	((!broadcast && ip_addr_isany(&mpcb->local_ip)) \|\|
idinor	0:dcf3c92487ca	291	ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) \|\|
idinor	0:dcf3c92487ca	292	#if LWIP_IGMP
idinor	0:dcf3c92487ca	293	ip_addr_ismulticast(&current_iphdr_dest) \|\|
idinor	0:dcf3c92487ca	294	#endif /* LWIP_IGMP */
idinor	0:dcf3c92487ca	295	#if IP_SOF_BROADCAST_RECV
idinor	0:dcf3c92487ca	296	(broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
idinor	0:dcf3c92487ca	297	#else /* IP_SOF_BROADCAST_RECV */
idinor	0:dcf3c92487ca	298	(broadcast))) {
idinor	0:dcf3c92487ca	299	#endif /* IP_SOF_BROADCAST_RECV */
idinor	0:dcf3c92487ca	300	/* pass a copy of the packet to all local matches */
idinor	0:dcf3c92487ca	301	if (mpcb->recv != NULL) {
idinor	0:dcf3c92487ca	302	struct pbuf *q;
idinor	0:dcf3c92487ca	303	/* for that, move payload to IP header again */
idinor	0:dcf3c92487ca	304	if (p_header_changed == 0) {
idinor	0:dcf3c92487ca	305	pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
idinor	0:dcf3c92487ca	306	p_header_changed = 1;
idinor	0:dcf3c92487ca	307	}
idinor	0:dcf3c92487ca	308	q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
idinor	0:dcf3c92487ca	309	if (q != NULL) {
idinor	0:dcf3c92487ca	310	err_t err = pbuf_copy(q, p);
idinor	0:dcf3c92487ca	311	if (err == ERR_OK) {
idinor	0:dcf3c92487ca	312	/* move payload to UDP data */
idinor	0:dcf3c92487ca	313	pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
idinor	0:dcf3c92487ca	314	mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
idinor	0:dcf3c92487ca	315	}
idinor	0:dcf3c92487ca	316	}
idinor	0:dcf3c92487ca	317	}
idinor	0:dcf3c92487ca	318	}
idinor	0:dcf3c92487ca	319	}
idinor	0:dcf3c92487ca	320	}
idinor	0:dcf3c92487ca	321	if (p_header_changed) {
idinor	0:dcf3c92487ca	322	/* and move payload to UDP data again */
idinor	0:dcf3c92487ca	323	pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
idinor	0:dcf3c92487ca	324	}
idinor	0:dcf3c92487ca	325	}
idinor	0:dcf3c92487ca	326	#endif /* SO_REUSE && SO_REUSE_RXTOALL */
idinor	0:dcf3c92487ca	327	/* callback */
idinor	0:dcf3c92487ca	328	if (pcb->recv != NULL) {
idinor	0:dcf3c92487ca	329	/* now the recv function is responsible for freeing p */
idinor	0:dcf3c92487ca	330	pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
idinor	0:dcf3c92487ca	331	} else {
idinor	0:dcf3c92487ca	332	/* no recv function registered? then we have to free the pbuf! */
idinor	0:dcf3c92487ca	333	pbuf_free(p);
idinor	0:dcf3c92487ca	334	goto end;
idinor	0:dcf3c92487ca	335	}
idinor	0:dcf3c92487ca	336	} else {
idinor	0:dcf3c92487ca	337	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
idinor	0:dcf3c92487ca	338
idinor	0:dcf3c92487ca	339	#if LWIP_ICMP
idinor	0:dcf3c92487ca	340	/* No match was found, send ICMP destination port unreachable unless
idinor	0:dcf3c92487ca	341	destination address was broadcast/multicast. */
idinor	0:dcf3c92487ca	342	if (!broadcast &&
idinor	0:dcf3c92487ca	343	!ip_addr_ismulticast(&current_iphdr_dest)) {
idinor	0:dcf3c92487ca	344	/* move payload pointer back to ip header */
idinor	0:dcf3c92487ca	345	pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
idinor	0:dcf3c92487ca	346	LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
idinor	0:dcf3c92487ca	347	icmp_dest_unreach(p, ICMP_DUR_PORT);
idinor	0:dcf3c92487ca	348	}
idinor	0:dcf3c92487ca	349	#endif /* LWIP_ICMP */
idinor	0:dcf3c92487ca	350	UDP_STATS_INC(udp.proterr);
idinor	0:dcf3c92487ca	351	UDP_STATS_INC(udp.drop);
idinor	0:dcf3c92487ca	352	snmp_inc_udpnoports();
idinor	0:dcf3c92487ca	353	pbuf_free(p);
idinor	0:dcf3c92487ca	354	}
idinor	0:dcf3c92487ca	355	} else {
idinor	0:dcf3c92487ca	356	pbuf_free(p);
idinor	0:dcf3c92487ca	357	}
idinor	0:dcf3c92487ca	358	end:
idinor	0:dcf3c92487ca	359	PERF_STOP("udp_input");
idinor	0:dcf3c92487ca	360	}
idinor	0:dcf3c92487ca	361
idinor	0:dcf3c92487ca	362	/**
idinor	0:dcf3c92487ca	363	* Send data using UDP.
idinor	0:dcf3c92487ca	364	*
idinor	0:dcf3c92487ca	365	* @param pcb UDP PCB used to send the data.
idinor	0:dcf3c92487ca	366	* @param p chain of pbuf's to be sent.
idinor	0:dcf3c92487ca	367	*
idinor	0:dcf3c92487ca	368	* The datagram will be sent to the current remote_ip & remote_port
idinor	0:dcf3c92487ca	369	* stored in pcb. If the pcb is not bound to a port, it will
idinor	0:dcf3c92487ca	370	* automatically be bound to a random port.
idinor	0:dcf3c92487ca	371	*
idinor	0:dcf3c92487ca	372	* @return lwIP error code.
idinor	0:dcf3c92487ca	373	* - ERR_OK. Successful. No error occured.
idinor	0:dcf3c92487ca	374	* - ERR_MEM. Out of memory.
idinor	0:dcf3c92487ca	375	* - ERR_RTE. Could not find route to destination address.
idinor	0:dcf3c92487ca	376	* - More errors could be returned by lower protocol layers.
idinor	0:dcf3c92487ca	377	*
idinor	0:dcf3c92487ca	378	* @see udp_disconnect() udp_sendto()
idinor	0:dcf3c92487ca	379	*/
idinor	0:dcf3c92487ca	380	err_t
idinor	0:dcf3c92487ca	381	udp_send(struct udp_pcb pcb, struct pbuf p)
idinor	0:dcf3c92487ca	382	{
idinor	0:dcf3c92487ca	383	/* send to the packet using remote ip and port stored in the pcb */
idinor	0:dcf3c92487ca	384	return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
idinor	0:dcf3c92487ca	385	}
idinor	0:dcf3c92487ca	386
idinor	0:dcf3c92487ca	387	#if LWIP_CHECKSUM_ON_COPY
idinor	0:dcf3c92487ca	388	/** Same as udp_send() but with checksum
idinor	0:dcf3c92487ca	389	*/
idinor	0:dcf3c92487ca	390	err_t
idinor	0:dcf3c92487ca	391	udp_send_chksum(struct udp_pcb pcb, struct pbuf p,
idinor	0:dcf3c92487ca	392	u8_t have_chksum, u16_t chksum)
idinor	0:dcf3c92487ca	393	{
idinor	0:dcf3c92487ca	394	/* send to the packet using remote ip and port stored in the pcb */
idinor	0:dcf3c92487ca	395	return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
idinor	0:dcf3c92487ca	396	have_chksum, chksum);
idinor	0:dcf3c92487ca	397	}
idinor	0:dcf3c92487ca	398	#endif /* LWIP_CHECKSUM_ON_COPY */
idinor	0:dcf3c92487ca	399
idinor	0:dcf3c92487ca	400	/**
idinor	0:dcf3c92487ca	401	* Send data to a specified address using UDP.
idinor	0:dcf3c92487ca	402	*
idinor	0:dcf3c92487ca	403	* @param pcb UDP PCB used to send the data.
idinor	0:dcf3c92487ca	404	* @param p chain of pbuf's to be sent.
idinor	0:dcf3c92487ca	405	* @param dst_ip Destination IP address.
idinor	0:dcf3c92487ca	406	* @param dst_port Destination UDP port.
idinor	0:dcf3c92487ca	407	*
idinor	0:dcf3c92487ca	408	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
idinor	0:dcf3c92487ca	409	*
idinor	0:dcf3c92487ca	410	* If the PCB already has a remote address association, it will
idinor	0:dcf3c92487ca	411	* be restored after the data is sent.
idinor	0:dcf3c92487ca	412	*
idinor	0:dcf3c92487ca	413	* @return lwIP error code (@see udp_send for possible error codes)
idinor	0:dcf3c92487ca	414	*
idinor	0:dcf3c92487ca	415	* @see udp_disconnect() udp_send()
idinor	0:dcf3c92487ca	416	*/
idinor	0:dcf3c92487ca	417	err_t
idinor	0:dcf3c92487ca	418	udp_sendto(struct udp_pcb pcb, struct pbuf p,
idinor	0:dcf3c92487ca	419	ip_addr_t *dst_ip, u16_t dst_port)
idinor	0:dcf3c92487ca	420	{
idinor	0:dcf3c92487ca	421	#if LWIP_CHECKSUM_ON_COPY
idinor	0:dcf3c92487ca	422	return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
idinor	0:dcf3c92487ca	423	}
idinor	0:dcf3c92487ca	424
idinor	0:dcf3c92487ca	425	/** Same as udp_sendto(), but with checksum */
idinor	0:dcf3c92487ca	426	err_t
idinor	0:dcf3c92487ca	427	udp_sendto_chksum(struct udp_pcb pcb, struct pbuf p, ip_addr_t *dst_ip,
idinor	0:dcf3c92487ca	428	u16_t dst_port, u8_t have_chksum, u16_t chksum)
idinor	0:dcf3c92487ca	429	{
idinor	0:dcf3c92487ca	430	#endif /* LWIP_CHECKSUM_ON_COPY */
idinor	0:dcf3c92487ca	431	struct netif *netif;
idinor	0:dcf3c92487ca	432
idinor	0:dcf3c92487ca	433	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send\n"));
idinor	0:dcf3c92487ca	434
idinor	0:dcf3c92487ca	435	/* find the outgoing network interface for this packet */
idinor	0:dcf3c92487ca	436	#if LWIP_IGMP
idinor	0:dcf3c92487ca	437	netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
idinor	0:dcf3c92487ca	438	#else
idinor	0:dcf3c92487ca	439	netif = ip_route(dst_ip);
idinor	0:dcf3c92487ca	440	#endif /* LWIP_IGMP */
idinor	0:dcf3c92487ca	441
idinor	0:dcf3c92487ca	442	/* no outgoing network interface could be found? */
idinor	0:dcf3c92487ca	443	if (netif == NULL) {
idinor	0:dcf3c92487ca	444	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
idinor	0:dcf3c92487ca	445	ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
idinor	0:dcf3c92487ca	446	UDP_STATS_INC(udp.rterr);
idinor	0:dcf3c92487ca	447	return ERR_RTE;
idinor	0:dcf3c92487ca	448	}
idinor	0:dcf3c92487ca	449	#if LWIP_CHECKSUM_ON_COPY
idinor	0:dcf3c92487ca	450	return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
idinor	0:dcf3c92487ca	451	#else /* LWIP_CHECKSUM_ON_COPY */
idinor	0:dcf3c92487ca	452	return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
idinor	0:dcf3c92487ca	453	#endif /* LWIP_CHECKSUM_ON_COPY */
idinor	0:dcf3c92487ca	454	}
idinor	0:dcf3c92487ca	455
idinor	0:dcf3c92487ca	456	/**
idinor	0:dcf3c92487ca	457	* Send data to a specified address using UDP.
idinor	0:dcf3c92487ca	458	* The netif used for sending can be specified.
idinor	0:dcf3c92487ca	459	*
idinor	0:dcf3c92487ca	460	* This function exists mainly for DHCP, to be able to send UDP packets
idinor	0:dcf3c92487ca	461	* on a netif that is still down.
idinor	0:dcf3c92487ca	462	*
idinor	0:dcf3c92487ca	463	* @param pcb UDP PCB used to send the data.
idinor	0:dcf3c92487ca	464	* @param p chain of pbuf's to be sent.
idinor	0:dcf3c92487ca	465	* @param dst_ip Destination IP address.
idinor	0:dcf3c92487ca	466	* @param dst_port Destination UDP port.
idinor	0:dcf3c92487ca	467	* @param netif the netif used for sending.
idinor	0:dcf3c92487ca	468	*
idinor	0:dcf3c92487ca	469	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
idinor	0:dcf3c92487ca	470	*
idinor	0:dcf3c92487ca	471	* @return lwIP error code (@see udp_send for possible error codes)
idinor	0:dcf3c92487ca	472	*
idinor	0:dcf3c92487ca	473	* @see udp_disconnect() udp_send()
idinor	0:dcf3c92487ca	474	*/
idinor	0:dcf3c92487ca	475	err_t
idinor	0:dcf3c92487ca	476	udp_sendto_if(struct udp_pcb pcb, struct pbuf p,
idinor	0:dcf3c92487ca	477	ip_addr_t dst_ip, u16_t dst_port, struct netif netif)
idinor	0:dcf3c92487ca	478	{
idinor	0:dcf3c92487ca	479	#if LWIP_CHECKSUM_ON_COPY
idinor	0:dcf3c92487ca	480	return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
idinor	0:dcf3c92487ca	481	}
idinor	0:dcf3c92487ca	482
idinor	0:dcf3c92487ca	483	/** Same as udp_sendto_if(), but with checksum */
idinor	0:dcf3c92487ca	484	err_t
idinor	0:dcf3c92487ca	485	udp_sendto_if_chksum(struct udp_pcb pcb, struct pbuf p, ip_addr_t *dst_ip,
idinor	0:dcf3c92487ca	486	u16_t dst_port, struct netif *netif, u8_t have_chksum,
idinor	0:dcf3c92487ca	487	u16_t chksum)
idinor	0:dcf3c92487ca	488	{
idinor	0:dcf3c92487ca	489	#endif /* LWIP_CHECKSUM_ON_COPY */
idinor	0:dcf3c92487ca	490	struct udp_hdr *udphdr;
idinor	0:dcf3c92487ca	491	ip_addr_t *src_ip;
idinor	0:dcf3c92487ca	492	err_t err;
idinor	0:dcf3c92487ca	493	struct pbuf q; / q will be sent down the stack */
idinor	0:dcf3c92487ca	494
idinor	0:dcf3c92487ca	495	#if IP_SOF_BROADCAST
idinor	0:dcf3c92487ca	496	/* broadcast filter? */
idinor	0:dcf3c92487ca	497	if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
idinor	0:dcf3c92487ca	498	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
idinor	0:dcf3c92487ca	499	("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
idinor	0:dcf3c92487ca	500	return ERR_VAL;
idinor	0:dcf3c92487ca	501	}
idinor	0:dcf3c92487ca	502	#endif /* IP_SOF_BROADCAST */
idinor	0:dcf3c92487ca	503
idinor	0:dcf3c92487ca	504	/* if the PCB is not yet bound to a port, bind it here */
idinor	0:dcf3c92487ca	505	if (pcb->local_port == 0) {
idinor	0:dcf3c92487ca	506	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
idinor	0:dcf3c92487ca	507	err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
idinor	0:dcf3c92487ca	508	if (err != ERR_OK) {
idinor	0:dcf3c92487ca	509	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
idinor	0:dcf3c92487ca	510	return err;
idinor	0:dcf3c92487ca	511	}
idinor	0:dcf3c92487ca	512	}
idinor	0:dcf3c92487ca	513
idinor	0:dcf3c92487ca	514	/* not enough space to add an UDP header to first pbuf in given p chain? */
idinor	0:dcf3c92487ca	515	if (pbuf_header(p, UDP_HLEN)) {
idinor	0:dcf3c92487ca	516	/* allocate header in a separate new pbuf */
idinor	0:dcf3c92487ca	517	q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
idinor	0:dcf3c92487ca	518	/* new header pbuf could not be allocated? */
idinor	0:dcf3c92487ca	519	if (q == NULL) {
idinor	0:dcf3c92487ca	520	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
idinor	0:dcf3c92487ca	521	return ERR_MEM;
idinor	0:dcf3c92487ca	522	}
idinor	0:dcf3c92487ca	523	/* chain header q in front of given pbuf p */
idinor	0:dcf3c92487ca	524	pbuf_chain(q, p);
idinor	0:dcf3c92487ca	525	/* first pbuf q points to header pbuf */
idinor	0:dcf3c92487ca	526	LWIP_DEBUGF(UDP_DEBUG,
idinor	0:dcf3c92487ca	527	("udp_send: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
idinor	0:dcf3c92487ca	528	} else {
idinor	0:dcf3c92487ca	529	/* adding space for header within p succeeded */
idinor	0:dcf3c92487ca	530	/* first pbuf q equals given pbuf */
idinor	0:dcf3c92487ca	531	q = p;
idinor	0:dcf3c92487ca	532	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
idinor	0:dcf3c92487ca	533	}
idinor	0:dcf3c92487ca	534	LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
idinor	0:dcf3c92487ca	535	(q->len >= sizeof(struct udp_hdr)));
idinor	0:dcf3c92487ca	536	/* q now represents the packet to be sent */
idinor	0:dcf3c92487ca	537	udphdr = (struct udp_hdr *)q->payload;
idinor	0:dcf3c92487ca	538	udphdr->src = htons(pcb->local_port);
idinor	0:dcf3c92487ca	539	udphdr->dest = htons(dst_port);
idinor	0:dcf3c92487ca	540	/* in UDP, 0 checksum means 'no checksum' */
idinor	0:dcf3c92487ca	541	udphdr->chksum = 0x0000;
idinor	0:dcf3c92487ca	542
idinor	0:dcf3c92487ca	543	/* Multicast Loop? */
idinor	0:dcf3c92487ca	544	#if LWIP_IGMP
idinor	0:dcf3c92487ca	545	if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
idinor	0:dcf3c92487ca	546	q->flags \|= PBUF_FLAG_MCASTLOOP;
idinor	0:dcf3c92487ca	547	}
idinor	0:dcf3c92487ca	548	#endif /* LWIP_IGMP */
idinor	0:dcf3c92487ca	549
idinor	0:dcf3c92487ca	550
idinor	0:dcf3c92487ca	551	/* PCB local address is IP_ANY_ADDR? */
idinor	0:dcf3c92487ca	552	if (ip_addr_isany(&pcb->local_ip)) {
idinor	0:dcf3c92487ca	553	/* use outgoing network interface IP address as source address */
idinor	0:dcf3c92487ca	554	src_ip = &(netif->ip_addr);
idinor	0:dcf3c92487ca	555	} else {
idinor	0:dcf3c92487ca	556	/* check if UDP PCB local IP address is correct
idinor	0:dcf3c92487ca	557	* this could be an old address if netif->ip_addr has changed */
idinor	0:dcf3c92487ca	558	if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
idinor	0:dcf3c92487ca	559	/* local_ip doesn't match, drop the packet */
idinor	0:dcf3c92487ca	560	if (q != p) {
idinor	0:dcf3c92487ca	561	/* free the header pbuf */
idinor	0:dcf3c92487ca	562	pbuf_free(q);
idinor	0:dcf3c92487ca	563	q = NULL;
idinor	0:dcf3c92487ca	564	/* p is still referenced by the caller, and will live on */
idinor	0:dcf3c92487ca	565	}
idinor	0:dcf3c92487ca	566	return ERR_VAL;
idinor	0:dcf3c92487ca	567	}
idinor	0:dcf3c92487ca	568	/* use UDP PCB local IP address as source address */
idinor	0:dcf3c92487ca	569	src_ip = &(pcb->local_ip);
idinor	0:dcf3c92487ca	570	}
idinor	0:dcf3c92487ca	571
idinor	0:dcf3c92487ca	572	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
idinor	0:dcf3c92487ca	573
idinor	0:dcf3c92487ca	574	#if LWIP_UDPLITE
idinor	0:dcf3c92487ca	575	/* UDP Lite protocol? */
idinor	0:dcf3c92487ca	576	if (pcb->flags & UDP_FLAGS_UDPLITE) {
idinor	0:dcf3c92487ca	577	u16_t chklen, chklen_hdr;
idinor	0:dcf3c92487ca	578	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
idinor	0:dcf3c92487ca	579	/* set UDP message length in UDP header */
idinor	0:dcf3c92487ca	580	chklen_hdr = chklen = pcb->chksum_len_tx;
idinor	0:dcf3c92487ca	581	if ((chklen < sizeof(struct udp_hdr)) \|\| (chklen > q->tot_len)) {
idinor	0:dcf3c92487ca	582	if (chklen != 0) {
idinor	0:dcf3c92487ca	583	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
idinor	0:dcf3c92487ca	584	}
idinor	0:dcf3c92487ca	585	/* For UDP-Lite, checksum length of 0 means checksum
idinor	0:dcf3c92487ca	586	over the complete packet. (See RFC 3828 chap. 3.1)
idinor	0:dcf3c92487ca	587	At least the UDP-Lite header must be covered by the
idinor	0:dcf3c92487ca	588	checksum, therefore, if chksum_len has an illegal
idinor	0:dcf3c92487ca	589	value, we generate the checksum over the complete
idinor	0:dcf3c92487ca	590	packet to be safe. */
idinor	0:dcf3c92487ca	591	chklen_hdr = 0;
idinor	0:dcf3c92487ca	592	chklen = q->tot_len;
idinor	0:dcf3c92487ca	593	}
idinor	0:dcf3c92487ca	594	udphdr->len = htons(chklen_hdr);
idinor	0:dcf3c92487ca	595	/* calculate checksum */
idinor	0:dcf3c92487ca	596	#if CHECKSUM_GEN_UDP
idinor	0:dcf3c92487ca	597	udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
idinor	0:dcf3c92487ca	598	IP_PROTO_UDPLITE, q->tot_len,
idinor	0:dcf3c92487ca	599	#if !LWIP_CHECKSUM_ON_COPY
idinor	0:dcf3c92487ca	600	chklen);
idinor	0:dcf3c92487ca	601	#else /* !LWIP_CHECKSUM_ON_COPY */
idinor	0:dcf3c92487ca	602	(have_chksum ? UDP_HLEN : chklen));
idinor	0:dcf3c92487ca	603	if (have_chksum) {
idinor	0:dcf3c92487ca	604	u32_t acc;
idinor	0:dcf3c92487ca	605	acc = udphdr->chksum + (u16_t)~(chksum);
idinor	0:dcf3c92487ca	606	udphdr->chksum = FOLD_U32T(acc);
idinor	0:dcf3c92487ca	607	}
idinor	0:dcf3c92487ca	608	#endif /* !LWIP_CHECKSUM_ON_COPY */
idinor	0:dcf3c92487ca	609
idinor	0:dcf3c92487ca	610	/* chksum zero must become 0xffff, as zero means 'no checksum' */
idinor	0:dcf3c92487ca	611	if (udphdr->chksum == 0x0000) {
idinor	0:dcf3c92487ca	612	udphdr->chksum = 0xffff;
idinor	0:dcf3c92487ca	613	}
idinor	0:dcf3c92487ca	614	#endif /* CHECKSUM_GEN_UDP */
idinor	0:dcf3c92487ca	615	/* output to IP */
idinor	0:dcf3c92487ca	616	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
idinor	0:dcf3c92487ca	617	#if LWIP_NETIF_HWADDRHINT
idinor	0:dcf3c92487ca	618	netif->addr_hint = &(pcb->addr_hint);
idinor	0:dcf3c92487ca	619	#endif /* LWIP_NETIF_HWADDRHINT*/
idinor	0:dcf3c92487ca	620	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
idinor	0:dcf3c92487ca	621	#if LWIP_NETIF_HWADDRHINT
idinor	0:dcf3c92487ca	622	netif->addr_hint = NULL;
idinor	0:dcf3c92487ca	623	#endif /* LWIP_NETIF_HWADDRHINT*/
idinor	0:dcf3c92487ca	624	} else
idinor	0:dcf3c92487ca	625	#endif /* LWIP_UDPLITE */
idinor	0:dcf3c92487ca	626	{ /* UDP */
idinor	0:dcf3c92487ca	627	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
idinor	0:dcf3c92487ca	628	udphdr->len = htons(q->tot_len);
idinor	0:dcf3c92487ca	629	/* calculate checksum */
idinor	0:dcf3c92487ca	630	#if CHECKSUM_GEN_UDP
idinor	0:dcf3c92487ca	631	if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
idinor	0:dcf3c92487ca	632	u16_t udpchksum;
idinor	0:dcf3c92487ca	633	#if LWIP_CHECKSUM_ON_COPY
idinor	0:dcf3c92487ca	634	if (have_chksum) {
idinor	0:dcf3c92487ca	635	u32_t acc;
idinor	0:dcf3c92487ca	636	udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
idinor	0:dcf3c92487ca	637	q->tot_len, UDP_HLEN);
idinor	0:dcf3c92487ca	638	acc = udpchksum + (u16_t)~(chksum);
idinor	0:dcf3c92487ca	639	udpchksum = FOLD_U32T(acc);
idinor	0:dcf3c92487ca	640	} else
idinor	0:dcf3c92487ca	641	#endif /* LWIP_CHECKSUM_ON_COPY */
idinor	0:dcf3c92487ca	642	{
idinor	0:dcf3c92487ca	643	udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
idinor	0:dcf3c92487ca	644	}
idinor	0:dcf3c92487ca	645
idinor	0:dcf3c92487ca	646	/* chksum zero must become 0xffff, as zero means 'no checksum' */
idinor	0:dcf3c92487ca	647	if (udpchksum == 0x0000) {
idinor	0:dcf3c92487ca	648	udpchksum = 0xffff;
idinor	0:dcf3c92487ca	649	}
idinor	0:dcf3c92487ca	650	udphdr->chksum = udpchksum;
idinor	0:dcf3c92487ca	651	}
idinor	0:dcf3c92487ca	652	#endif /* CHECKSUM_GEN_UDP */
idinor	0:dcf3c92487ca	653	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
idinor	0:dcf3c92487ca	654	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
idinor	0:dcf3c92487ca	655	/* output to IP */
idinor	0:dcf3c92487ca	656	#if LWIP_NETIF_HWADDRHINT
idinor	0:dcf3c92487ca	657	netif->addr_hint = &(pcb->addr_hint);
idinor	0:dcf3c92487ca	658	#endif /* LWIP_NETIF_HWADDRHINT*/
idinor	0:dcf3c92487ca	659	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
idinor	0:dcf3c92487ca	660	#if LWIP_NETIF_HWADDRHINT
idinor	0:dcf3c92487ca	661	netif->addr_hint = NULL;
idinor	0:dcf3c92487ca	662	#endif /* LWIP_NETIF_HWADDRHINT*/
idinor	0:dcf3c92487ca	663	}
idinor	0:dcf3c92487ca	664	/* TODO: must this be increased even if error occured? */
idinor	0:dcf3c92487ca	665	snmp_inc_udpoutdatagrams();
idinor	0:dcf3c92487ca	666
idinor	0:dcf3c92487ca	667	/* did we chain a separate header pbuf earlier? */
idinor	0:dcf3c92487ca	668	if (q != p) {
idinor	0:dcf3c92487ca	669	/* free the header pbuf */
idinor	0:dcf3c92487ca	670	pbuf_free(q);
idinor	0:dcf3c92487ca	671	q = NULL;
idinor	0:dcf3c92487ca	672	/* p is still referenced by the caller, and will live on */
idinor	0:dcf3c92487ca	673	}
idinor	0:dcf3c92487ca	674
idinor	0:dcf3c92487ca	675	UDP_STATS_INC(udp.xmit);
idinor	0:dcf3c92487ca	676	return err;
idinor	0:dcf3c92487ca	677	}
idinor	0:dcf3c92487ca	678
idinor	0:dcf3c92487ca	679	/**
idinor	0:dcf3c92487ca	680	* Bind an UDP PCB.
idinor	0:dcf3c92487ca	681	*
idinor	0:dcf3c92487ca	682	* @param pcb UDP PCB to be bound with a local address ipaddr and port.
idinor	0:dcf3c92487ca	683	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
idinor	0:dcf3c92487ca	684	* bind to all local interfaces.
idinor	0:dcf3c92487ca	685	* @param port local UDP port to bind with. Use 0 to automatically bind
idinor	0:dcf3c92487ca	686	* to a random port between UDP_LOCAL_PORT_RANGE_START and
idinor	0:dcf3c92487ca	687	* UDP_LOCAL_PORT_RANGE_END.
idinor	0:dcf3c92487ca	688	*
idinor	0:dcf3c92487ca	689	* ipaddr & port are expected to be in the same byte order as in the pcb.
idinor	0:dcf3c92487ca	690	*
idinor	0:dcf3c92487ca	691	* @return lwIP error code.
idinor	0:dcf3c92487ca	692	* - ERR_OK. Successful. No error occured.
idinor	0:dcf3c92487ca	693	* - ERR_USE. The specified ipaddr and port are already bound to by
idinor	0:dcf3c92487ca	694	* another UDP PCB.
idinor	0:dcf3c92487ca	695	*
idinor	0:dcf3c92487ca	696	* @see udp_disconnect()
idinor	0:dcf3c92487ca	697	*/
idinor	0:dcf3c92487ca	698	err_t
idinor	0:dcf3c92487ca	699	udp_bind(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
idinor	0:dcf3c92487ca	700	{
idinor	0:dcf3c92487ca	701	struct udp_pcb *ipcb;
idinor	0:dcf3c92487ca	702	u8_t rebind;
idinor	0:dcf3c92487ca	703
idinor	0:dcf3c92487ca	704	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
idinor	0:dcf3c92487ca	705	ip_addr_debug_print(UDP_DEBUG, ipaddr);
idinor	0:dcf3c92487ca	706	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
idinor	0:dcf3c92487ca	707
idinor	0:dcf3c92487ca	708	rebind = 0;
idinor	0:dcf3c92487ca	709	/* Check for double bind and rebind of the same pcb */
idinor	0:dcf3c92487ca	710	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
idinor	0:dcf3c92487ca	711	/* is this UDP PCB already on active list? */
idinor	0:dcf3c92487ca	712	if (pcb == ipcb) {
idinor	0:dcf3c92487ca	713	/* pcb may occur at most once in active list */
idinor	0:dcf3c92487ca	714	LWIP_ASSERT("rebind == 0", rebind == 0);
idinor	0:dcf3c92487ca	715	/* pcb already in list, just rebind */
idinor	0:dcf3c92487ca	716	rebind = 1;
idinor	0:dcf3c92487ca	717	}
idinor	0:dcf3c92487ca	718
idinor	0:dcf3c92487ca	719	/* By default, we don't allow to bind to a port that any other udp
idinor	0:dcf3c92487ca	720	PCB is alread bound to, unless all PCBs with that port have tha
idinor	0:dcf3c92487ca	721	REUSEADDR flag set. */
idinor	0:dcf3c92487ca	722	#if SO_REUSE
idinor	0:dcf3c92487ca	723	else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
idinor	0:dcf3c92487ca	724	((ipcb->so_options & SOF_REUSEADDR) == 0)) {
idinor	0:dcf3c92487ca	725	#else /* SO_REUSE */
idinor	0:dcf3c92487ca	726	/* port matches that of PCB in list and REUSEADDR not set -> reject */
idinor	0:dcf3c92487ca	727	else {
idinor	0:dcf3c92487ca	728	#endif /* SO_REUSE */
idinor	0:dcf3c92487ca	729	if ((ipcb->local_port == port) &&
idinor	0:dcf3c92487ca	730	/* IP address matches, or one is IP_ADDR_ANY? */
idinor	0:dcf3c92487ca	731	(ip_addr_isany(&(ipcb->local_ip)) \|\|
idinor	0:dcf3c92487ca	732	ip_addr_isany(ipaddr) \|\|
idinor	0:dcf3c92487ca	733	ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
idinor	0:dcf3c92487ca	734	/* other PCB already binds to this local IP and port */
idinor	0:dcf3c92487ca	735	LWIP_DEBUGF(UDP_DEBUG,
idinor	0:dcf3c92487ca	736	("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
idinor	0:dcf3c92487ca	737	return ERR_USE;
idinor	0:dcf3c92487ca	738	}
idinor	0:dcf3c92487ca	739	}
idinor	0:dcf3c92487ca	740	}
idinor	0:dcf3c92487ca	741
idinor	0:dcf3c92487ca	742	ip_addr_set(&pcb->local_ip, ipaddr);
idinor	0:dcf3c92487ca	743
idinor	0:dcf3c92487ca	744	/* no port specified? */
idinor	0:dcf3c92487ca	745	if (port == 0) {
idinor	0:dcf3c92487ca	746	#ifndef UDP_LOCAL_PORT_RANGE_START
idinor	0:dcf3c92487ca	747	#define UDP_LOCAL_PORT_RANGE_START 4096
idinor	0:dcf3c92487ca	748	#define UDP_LOCAL_PORT_RANGE_END 0x7fff
idinor	0:dcf3c92487ca	749	#endif
idinor	0:dcf3c92487ca	750	port = UDP_LOCAL_PORT_RANGE_START;
idinor	0:dcf3c92487ca	751	ipcb = udp_pcbs;
idinor	0:dcf3c92487ca	752	while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
idinor	0:dcf3c92487ca	753	if (ipcb->local_port == port) {
idinor	0:dcf3c92487ca	754	/* port is already used by another udp_pcb */
idinor	0:dcf3c92487ca	755	port++;
idinor	0:dcf3c92487ca	756	/* restart scanning all udp pcbs */
idinor	0:dcf3c92487ca	757	ipcb = udp_pcbs;
idinor	0:dcf3c92487ca	758	} else {
idinor	0:dcf3c92487ca	759	/* go on with next udp pcb */
idinor	0:dcf3c92487ca	760	ipcb = ipcb->next;
idinor	0:dcf3c92487ca	761	}
idinor	0:dcf3c92487ca	762	}
idinor	0:dcf3c92487ca	763	if (ipcb != NULL) {
idinor	0:dcf3c92487ca	764	/* no more ports available in local range */
idinor	0:dcf3c92487ca	765	LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
idinor	0:dcf3c92487ca	766	return ERR_USE;
idinor	0:dcf3c92487ca	767	}
idinor	0:dcf3c92487ca	768	}
idinor	0:dcf3c92487ca	769	pcb->local_port = port;
idinor	0:dcf3c92487ca	770	snmp_insert_udpidx_tree(pcb);
idinor	0:dcf3c92487ca	771	/* pcb not active yet? */
idinor	0:dcf3c92487ca	772	if (rebind == 0) {
idinor	0:dcf3c92487ca	773	/* place the PCB on the active list if not already there */
idinor	0:dcf3c92487ca	774	pcb->next = udp_pcbs;
idinor	0:dcf3c92487ca	775	udp_pcbs = pcb;
idinor	0:dcf3c92487ca	776	}
idinor	0:dcf3c92487ca	777	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
idinor	0:dcf3c92487ca	778	("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
idinor	0:dcf3c92487ca	779	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
idinor	0:dcf3c92487ca	780	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
idinor	0:dcf3c92487ca	781	pcb->local_port));
idinor	0:dcf3c92487ca	782	return ERR_OK;
idinor	0:dcf3c92487ca	783	}
idinor	0:dcf3c92487ca	784	/**
idinor	0:dcf3c92487ca	785	* Connect an UDP PCB.
idinor	0:dcf3c92487ca	786	*
idinor	0:dcf3c92487ca	787	* This will associate the UDP PCB with the remote address.
idinor	0:dcf3c92487ca	788	*
idinor	0:dcf3c92487ca	789	* @param pcb UDP PCB to be connected with remote address ipaddr and port.
idinor	0:dcf3c92487ca	790	* @param ipaddr remote IP address to connect with.
idinor	0:dcf3c92487ca	791	* @param port remote UDP port to connect with.
idinor	0:dcf3c92487ca	792	*
idinor	0:dcf3c92487ca	793	* @return lwIP error code
idinor	0:dcf3c92487ca	794	*
idinor	0:dcf3c92487ca	795	* ipaddr & port are expected to be in the same byte order as in the pcb.
idinor	0:dcf3c92487ca	796	*
idinor	0:dcf3c92487ca	797	* The udp pcb is bound to a random local port if not already bound.
idinor	0:dcf3c92487ca	798	*
idinor	0:dcf3c92487ca	799	* @see udp_disconnect()
idinor	0:dcf3c92487ca	800	*/
idinor	0:dcf3c92487ca	801	err_t
idinor	0:dcf3c92487ca	802	udp_connect(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
idinor	0:dcf3c92487ca	803	{
idinor	0:dcf3c92487ca	804	struct udp_pcb *ipcb;
idinor	0:dcf3c92487ca	805
idinor	0:dcf3c92487ca	806	if (pcb->local_port == 0) {
idinor	0:dcf3c92487ca	807	err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
idinor	0:dcf3c92487ca	808	if (err != ERR_OK) {
idinor	0:dcf3c92487ca	809	return err;
idinor	0:dcf3c92487ca	810	}
idinor	0:dcf3c92487ca	811	}
idinor	0:dcf3c92487ca	812
idinor	0:dcf3c92487ca	813	ip_addr_set(&pcb->remote_ip, ipaddr);
idinor	0:dcf3c92487ca	814	pcb->remote_port = port;
idinor	0:dcf3c92487ca	815	pcb->flags \|= UDP_FLAGS_CONNECTED;
idinor	0:dcf3c92487ca	816	/** TODO: this functionality belongs in upper layers */
idinor	0:dcf3c92487ca	817	#ifdef LWIP_UDP_TODO
idinor	0:dcf3c92487ca	818	/* Nail down local IP for netconn_addr()/getsockname() */
idinor	0:dcf3c92487ca	819	if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
idinor	0:dcf3c92487ca	820	struct netif *netif;
idinor	0:dcf3c92487ca	821
idinor	0:dcf3c92487ca	822	if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
idinor	0:dcf3c92487ca	823	LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
idinor	0:dcf3c92487ca	824	UDP_STATS_INC(udp.rterr);
idinor	0:dcf3c92487ca	825	return ERR_RTE;
idinor	0:dcf3c92487ca	826	}
idinor	0:dcf3c92487ca	827	/** TODO: this will bind the udp pcb locally, to the interface which
idinor	0:dcf3c92487ca	828	is used to route output packets to the remote address. However, we
idinor	0:dcf3c92487ca	829	might want to accept incoming packets on any interface! */
idinor	0:dcf3c92487ca	830	pcb->local_ip = netif->ip_addr;
idinor	0:dcf3c92487ca	831	} else if (ip_addr_isany(&pcb->remote_ip)) {
idinor	0:dcf3c92487ca	832	pcb->local_ip.addr = 0;
idinor	0:dcf3c92487ca	833	}
idinor	0:dcf3c92487ca	834	#endif
idinor	0:dcf3c92487ca	835	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
idinor	0:dcf3c92487ca	836	("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
idinor	0:dcf3c92487ca	837	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
idinor	0:dcf3c92487ca	838	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
idinor	0:dcf3c92487ca	839	pcb->local_port));
idinor	0:dcf3c92487ca	840
idinor	0:dcf3c92487ca	841	/* Insert UDP PCB into the list of active UDP PCBs. */
idinor	0:dcf3c92487ca	842	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
idinor	0:dcf3c92487ca	843	if (pcb == ipcb) {
idinor	0:dcf3c92487ca	844	/* already on the list, just return */
idinor	0:dcf3c92487ca	845	return ERR_OK;
idinor	0:dcf3c92487ca	846	}
idinor	0:dcf3c92487ca	847	}
idinor	0:dcf3c92487ca	848	/* PCB not yet on the list, add PCB now */
idinor	0:dcf3c92487ca	849	pcb->next = udp_pcbs;
idinor	0:dcf3c92487ca	850	udp_pcbs = pcb;
idinor	0:dcf3c92487ca	851	return ERR_OK;
idinor	0:dcf3c92487ca	852	}
idinor	0:dcf3c92487ca	853
idinor	0:dcf3c92487ca	854	/**
idinor	0:dcf3c92487ca	855	* Disconnect a UDP PCB
idinor	0:dcf3c92487ca	856	*
idinor	0:dcf3c92487ca	857	* @param pcb the udp pcb to disconnect.
idinor	0:dcf3c92487ca	858	*/
idinor	0:dcf3c92487ca	859	void
idinor	0:dcf3c92487ca	860	udp_disconnect(struct udp_pcb *pcb)
idinor	0:dcf3c92487ca	861	{
idinor	0:dcf3c92487ca	862	/* reset remote address association */
idinor	0:dcf3c92487ca	863	ip_addr_set_any(&pcb->remote_ip);
idinor	0:dcf3c92487ca	864	pcb->remote_port = 0;
idinor	0:dcf3c92487ca	865	/* mark PCB as unconnected */
idinor	0:dcf3c92487ca	866	pcb->flags &= ~UDP_FLAGS_CONNECTED;
idinor	0:dcf3c92487ca	867	}
idinor	0:dcf3c92487ca	868
idinor	0:dcf3c92487ca	869	/**
idinor	0:dcf3c92487ca	870	* Set a receive callback for a UDP PCB
idinor	0:dcf3c92487ca	871	*
idinor	0:dcf3c92487ca	872	* This callback will be called when receiving a datagram for the pcb.
idinor	0:dcf3c92487ca	873	*
idinor	0:dcf3c92487ca	874	* @param pcb the pcb for wich to set the recv callback
idinor	0:dcf3c92487ca	875	* @param recv function pointer of the callback function
idinor	0:dcf3c92487ca	876	* @param recv_arg additional argument to pass to the callback function
idinor	0:dcf3c92487ca	877	*/
idinor	0:dcf3c92487ca	878	void
idinor	0:dcf3c92487ca	879	udp_recv(struct udp_pcb pcb, udp_recv_fn recv, void recv_arg)
idinor	0:dcf3c92487ca	880	{
idinor	0:dcf3c92487ca	881	/* remember recv() callback and user data */
idinor	0:dcf3c92487ca	882	pcb->recv = recv;
idinor	0:dcf3c92487ca	883	pcb->recv_arg = recv_arg;
idinor	0:dcf3c92487ca	884	}
idinor	0:dcf3c92487ca	885
idinor	0:dcf3c92487ca	886	/**
idinor	0:dcf3c92487ca	887	* Remove an UDP PCB.
idinor	0:dcf3c92487ca	888	*
idinor	0:dcf3c92487ca	889	* @param pcb UDP PCB to be removed. The PCB is removed from the list of
idinor	0:dcf3c92487ca	890	* UDP PCB's and the data structure is freed from memory.
idinor	0:dcf3c92487ca	891	*
idinor	0:dcf3c92487ca	892	* @see udp_new()
idinor	0:dcf3c92487ca	893	*/
idinor	0:dcf3c92487ca	894	void
idinor	0:dcf3c92487ca	895	udp_remove(struct udp_pcb *pcb)
idinor	0:dcf3c92487ca	896	{
idinor	0:dcf3c92487ca	897	struct udp_pcb *pcb2;
idinor	0:dcf3c92487ca	898
idinor	0:dcf3c92487ca	899	snmp_delete_udpidx_tree(pcb);
idinor	0:dcf3c92487ca	900	/* pcb to be removed is first in list? */
idinor	0:dcf3c92487ca	901	if (udp_pcbs == pcb) {
idinor	0:dcf3c92487ca	902	/* make list start at 2nd pcb */
idinor	0:dcf3c92487ca	903	udp_pcbs = udp_pcbs->next;
idinor	0:dcf3c92487ca	904	/* pcb not 1st in list */
idinor	0:dcf3c92487ca	905	} else {
idinor	0:dcf3c92487ca	906	for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
idinor	0:dcf3c92487ca	907	/* find pcb in udp_pcbs list */
idinor	0:dcf3c92487ca	908	if (pcb2->next != NULL && pcb2->next == pcb) {
idinor	0:dcf3c92487ca	909	/* remove pcb from list */
idinor	0:dcf3c92487ca	910	pcb2->next = pcb->next;
idinor	0:dcf3c92487ca	911	}
idinor	0:dcf3c92487ca	912	}
idinor	0:dcf3c92487ca	913	}
idinor	0:dcf3c92487ca	914	memp_free(MEMP_UDP_PCB, pcb);
idinor	0:dcf3c92487ca	915	}
idinor	0:dcf3c92487ca	916
idinor	0:dcf3c92487ca	917	/**
idinor	0:dcf3c92487ca	918	* Create a UDP PCB.
idinor	0:dcf3c92487ca	919	*
idinor	0:dcf3c92487ca	920	* @return The UDP PCB which was created. NULL if the PCB data structure
idinor	0:dcf3c92487ca	921	* could not be allocated.
idinor	0:dcf3c92487ca	922	*
idinor	0:dcf3c92487ca	923	* @see udp_remove()
idinor	0:dcf3c92487ca	924	*/
idinor	0:dcf3c92487ca	925	struct udp_pcb *
idinor	0:dcf3c92487ca	926	udp_new(void)
idinor	0:dcf3c92487ca	927	{
idinor	0:dcf3c92487ca	928	struct udp_pcb *pcb;
idinor	0:dcf3c92487ca	929	pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
idinor	0:dcf3c92487ca	930	/* could allocate UDP PCB? */
idinor	0:dcf3c92487ca	931	if (pcb != NULL) {
idinor	0:dcf3c92487ca	932	/* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
idinor	0:dcf3c92487ca	933	* which means checksum is generated over the whole datagram per default
idinor	0:dcf3c92487ca	934	* (recommended as default by RFC 3828). */
idinor	0:dcf3c92487ca	935	/* initialize PCB to all zeroes */
idinor	0:dcf3c92487ca	936	memset(pcb, 0, sizeof(struct udp_pcb));
idinor	0:dcf3c92487ca	937	pcb->ttl = UDP_TTL;
idinor	0:dcf3c92487ca	938	}
idinor	0:dcf3c92487ca	939	return pcb;
idinor	0:dcf3c92487ca	940	}
idinor	0:dcf3c92487ca	941
idinor	0:dcf3c92487ca	942	#if UDP_DEBUG
idinor	0:dcf3c92487ca	943	/**
idinor	0:dcf3c92487ca	944	* Print UDP header information for debug purposes.
idinor	0:dcf3c92487ca	945	*
idinor	0:dcf3c92487ca	946	* @param udphdr pointer to the udp header in memory.
idinor	0:dcf3c92487ca	947	*/
idinor	0:dcf3c92487ca	948	void
idinor	0:dcf3c92487ca	949	udp_debug_print(struct udp_hdr *udphdr)
idinor	0:dcf3c92487ca	950	{
idinor	0:dcf3c92487ca	951	LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
idinor	0:dcf3c92487ca	952	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	953	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
idinor	0:dcf3c92487ca	954	ntohs(udphdr->src), ntohs(udphdr->dest)));
idinor	0:dcf3c92487ca	955	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	956	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| 0x%04"X16_F" \| (len, chksum)\n",
idinor	0:dcf3c92487ca	957	ntohs(udphdr->len), ntohs(udphdr->chksum)));
idinor	0:dcf3c92487ca	958	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
idinor	0:dcf3c92487ca	959	}
idinor	0:dcf3c92487ca	960	#endif /* UDP_DEBUG */
idinor	0:dcf3c92487ca	961
idinor	0:dcf3c92487ca	962	#endif /* LWIP_UDP */

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

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

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