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NetStack/lwip/core/udp.c@0:1a61c61d0845, 2012-04-03 (annotated)

Committer:: dcoban
Date:: Tue Apr 03 18:43:13 2012 +0000
Revision:: 0:1a61c61d0845

Who changed what in which revision?

User	Revision	Line number	New contents of line
dcoban	0:1a61c61d0845	1	/**
dcoban	0:1a61c61d0845	2	* @file
dcoban	0:1a61c61d0845	3	* User Datagram Protocol module
dcoban	0:1a61c61d0845	4	*
dcoban	0:1a61c61d0845	5	*/
dcoban	0:1a61c61d0845	6
dcoban	0:1a61c61d0845	7	/*
dcoban	0:1a61c61d0845	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
dcoban	0:1a61c61d0845	9	* All rights reserved.
dcoban	0:1a61c61d0845	10	*
dcoban	0:1a61c61d0845	11	* Redistribution and use in source and binary forms, with or without modification,
dcoban	0:1a61c61d0845	12	* are permitted provided that the following conditions are met:
dcoban	0:1a61c61d0845	13	*
dcoban	0:1a61c61d0845	14	* 1. Redistributions of source code must retain the above copyright notice,
dcoban	0:1a61c61d0845	15	* this list of conditions and the following disclaimer.
dcoban	0:1a61c61d0845	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
dcoban	0:1a61c61d0845	17	* this list of conditions and the following disclaimer in the documentation
dcoban	0:1a61c61d0845	18	* and/or other materials provided with the distribution.
dcoban	0:1a61c61d0845	19	* 3. The name of the author may not be used to endorse or promote products
dcoban	0:1a61c61d0845	20	* derived from this software without specific prior written permission.
dcoban	0:1a61c61d0845	21	*
dcoban	0:1a61c61d0845	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
dcoban	0:1a61c61d0845	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
dcoban	0:1a61c61d0845	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
dcoban	0:1a61c61d0845	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
dcoban	0:1a61c61d0845	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
dcoban	0:1a61c61d0845	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
dcoban	0:1a61c61d0845	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
dcoban	0:1a61c61d0845	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
dcoban	0:1a61c61d0845	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
dcoban	0:1a61c61d0845	31	* OF SUCH DAMAGE.
dcoban	0:1a61c61d0845	32	*
dcoban	0:1a61c61d0845	33	* This file is part of the lwIP TCP/IP stack.
dcoban	0:1a61c61d0845	34	*
dcoban	0:1a61c61d0845	35	* Author: Adam Dunkels <adam@sics.se>
dcoban	0:1a61c61d0845	36	*
dcoban	0:1a61c61d0845	37	*/
dcoban	0:1a61c61d0845	38
dcoban	0:1a61c61d0845	39
dcoban	0:1a61c61d0845	40	/* udp.c
dcoban	0:1a61c61d0845	41	*
dcoban	0:1a61c61d0845	42	* The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
dcoban	0:1a61c61d0845	43	*
dcoban	0:1a61c61d0845	44	*/
dcoban	0:1a61c61d0845	45
dcoban	0:1a61c61d0845	46	/* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
dcoban	0:1a61c61d0845	47	*/
dcoban	0:1a61c61d0845	48
dcoban	0:1a61c61d0845	49	#include "lwip/opt.h"
dcoban	0:1a61c61d0845	50
dcoban	0:1a61c61d0845	51	#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
dcoban	0:1a61c61d0845	52
dcoban	0:1a61c61d0845	53	#include "lwip/udp.h"
dcoban	0:1a61c61d0845	54	#include "lwip/def.h"
dcoban	0:1a61c61d0845	55	#include "lwip/memp.h"
dcoban	0:1a61c61d0845	56	#include "lwip/inet_chksum.h"
dcoban	0:1a61c61d0845	57	#include "lwip/ip_addr.h"
dcoban	0:1a61c61d0845	58	#include "lwip/netif.h"
dcoban	0:1a61c61d0845	59	#include "lwip/icmp.h"
dcoban	0:1a61c61d0845	60	#include "lwip/stats.h"
dcoban	0:1a61c61d0845	61	#include "lwip/snmp.h"
dcoban	0:1a61c61d0845	62	#include "arch/perf.h"
dcoban	0:1a61c61d0845	63	#include "lwip/dhcp.h"
dcoban	0:1a61c61d0845	64
dcoban	0:1a61c61d0845	65	#include <string.h>
dcoban	0:1a61c61d0845	66
dcoban	0:1a61c61d0845	67	/* The list of UDP PCBs */
dcoban	0:1a61c61d0845	68	/* exported in udp.h (was static) */
dcoban	0:1a61c61d0845	69	struct udp_pcb *udp_pcbs;
dcoban	0:1a61c61d0845	70
dcoban	0:1a61c61d0845	71	/**
dcoban	0:1a61c61d0845	72	* Process an incoming UDP datagram.
dcoban	0:1a61c61d0845	73	*
dcoban	0:1a61c61d0845	74	* Given an incoming UDP datagram (as a chain of pbufs) this function
dcoban	0:1a61c61d0845	75	* finds a corresponding UDP PCB and hands over the pbuf to the pcbs
dcoban	0:1a61c61d0845	76	* recv function. If no pcb is found or the datagram is incorrect, the
dcoban	0:1a61c61d0845	77	* pbuf is freed.
dcoban	0:1a61c61d0845	78	*
dcoban	0:1a61c61d0845	79	* @param p pbuf to be demultiplexed to a UDP PCB.
dcoban	0:1a61c61d0845	80	* @param inp network interface on which the datagram was received.
dcoban	0:1a61c61d0845	81	*
dcoban	0:1a61c61d0845	82	*/
dcoban	0:1a61c61d0845	83	void
dcoban	0:1a61c61d0845	84	udp_input(struct pbuf p, struct netif inp)
dcoban	0:1a61c61d0845	85	{
dcoban	0:1a61c61d0845	86	struct udp_hdr *udphdr;
dcoban	0:1a61c61d0845	87	struct udp_pcb pcb, prev;
dcoban	0:1a61c61d0845	88	struct udp_pcb *uncon_pcb;
dcoban	0:1a61c61d0845	89	struct ip_hdr *iphdr;
dcoban	0:1a61c61d0845	90	u16_t src, dest;
dcoban	0:1a61c61d0845	91	u8_t local_match;
dcoban	0:1a61c61d0845	92	u8_t broadcast;
dcoban	0:1a61c61d0845	93
dcoban	0:1a61c61d0845	94	PERF_START;
dcoban	0:1a61c61d0845	95
dcoban	0:1a61c61d0845	96	UDP_STATS_INC(udp.recv);
dcoban	0:1a61c61d0845	97
dcoban	0:1a61c61d0845	98	iphdr = (struct ip_hdr *)p->payload;
dcoban	0:1a61c61d0845	99
dcoban	0:1a61c61d0845	100	/* Check minimum length (IP header + UDP header)
dcoban	0:1a61c61d0845	101	* and move payload pointer to UDP header */
dcoban	0:1a61c61d0845	102	if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) \|\| pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
dcoban	0:1a61c61d0845	103	/* drop short packets */
dcoban	0:1a61c61d0845	104	LWIP_DEBUGF(UDP_DEBUG,
dcoban	0:1a61c61d0845	105	("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
dcoban	0:1a61c61d0845	106	UDP_STATS_INC(udp.lenerr);
dcoban	0:1a61c61d0845	107	UDP_STATS_INC(udp.drop);
dcoban	0:1a61c61d0845	108	snmp_inc_udpinerrors();
dcoban	0:1a61c61d0845	109	pbuf_free(p);
dcoban	0:1a61c61d0845	110	goto end;
dcoban	0:1a61c61d0845	111	}
dcoban	0:1a61c61d0845	112
dcoban	0:1a61c61d0845	113	udphdr = (struct udp_hdr *)p->payload;
dcoban	0:1a61c61d0845	114
dcoban	0:1a61c61d0845	115	/* is broadcast packet ? */
dcoban	0:1a61c61d0845	116	broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
dcoban	0:1a61c61d0845	117
dcoban	0:1a61c61d0845	118	LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
dcoban	0:1a61c61d0845	119
dcoban	0:1a61c61d0845	120	/* convert src and dest ports to host byte order */
dcoban	0:1a61c61d0845	121	src = ntohs(udphdr->src);
dcoban	0:1a61c61d0845	122	dest = ntohs(udphdr->dest);
dcoban	0:1a61c61d0845	123
dcoban	0:1a61c61d0845	124	udp_debug_print(udphdr);
dcoban	0:1a61c61d0845	125
dcoban	0:1a61c61d0845	126	/* print the UDP source and destination */
dcoban	0:1a61c61d0845	127	LWIP_DEBUGF(UDP_DEBUG,
dcoban	0:1a61c61d0845	128	("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
dcoban	0:1a61c61d0845	129	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
dcoban	0:1a61c61d0845	130	ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
dcoban	0:1a61c61d0845	131	ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
dcoban	0:1a61c61d0845	132	ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
dcoban	0:1a61c61d0845	133	ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
dcoban	0:1a61c61d0845	134
dcoban	0:1a61c61d0845	135	#if LWIP_DHCP
dcoban	0:1a61c61d0845	136	pcb = NULL;
dcoban	0:1a61c61d0845	137	/* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
dcoban	0:1a61c61d0845	138	the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
dcoban	0:1a61c61d0845	139	if (dest == DHCP_CLIENT_PORT) {
dcoban	0:1a61c61d0845	140	/* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
dcoban	0:1a61c61d0845	141	if (src == DHCP_SERVER_PORT) {
dcoban	0:1a61c61d0845	142	if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
dcoban	0:1a61c61d0845	143	/* accept the packe if
dcoban	0:1a61c61d0845	144	(- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
dcoban	0:1a61c61d0845	145	- inp->dhcp->pcb->remote == ANY or iphdr->src */
dcoban	0:1a61c61d0845	146	if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) \|\|
dcoban	0:1a61c61d0845	147	ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
dcoban	0:1a61c61d0845	148	pcb = inp->dhcp->pcb;
dcoban	0:1a61c61d0845	149	}
dcoban	0:1a61c61d0845	150	}
dcoban	0:1a61c61d0845	151	}
dcoban	0:1a61c61d0845	152	} else
dcoban	0:1a61c61d0845	153	#endif /* LWIP_DHCP */
dcoban	0:1a61c61d0845	154	{
dcoban	0:1a61c61d0845	155	prev = NULL;
dcoban	0:1a61c61d0845	156	local_match = 0;
dcoban	0:1a61c61d0845	157	uncon_pcb = NULL;
dcoban	0:1a61c61d0845	158	/* Iterate through the UDP pcb list for a matching pcb.
dcoban	0:1a61c61d0845	159	* 'Perfect match' pcbs (connected to the remote port & ip address) are
dcoban	0:1a61c61d0845	160	* preferred. If no perfect match is found, the first unconnected pcb that
dcoban	0:1a61c61d0845	161	* matches the local port and ip address gets the datagram. */
dcoban	0:1a61c61d0845	162	for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
dcoban	0:1a61c61d0845	163	local_match = 0;
dcoban	0:1a61c61d0845	164	/* print the PCB local and remote address */
dcoban	0:1a61c61d0845	165	LWIP_DEBUGF(UDP_DEBUG,
dcoban	0:1a61c61d0845	166	("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
dcoban	0:1a61c61d0845	167	"(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
dcoban	0:1a61c61d0845	168	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
dcoban	0:1a61c61d0845	169	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
dcoban	0:1a61c61d0845	170	ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
dcoban	0:1a61c61d0845	171	ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
dcoban	0:1a61c61d0845	172
dcoban	0:1a61c61d0845	173	/* compare PCB local addr+port to UDP destination addr+port */
dcoban	0:1a61c61d0845	174	if ((pcb->local_port == dest) &&
dcoban	0:1a61c61d0845	175	((!broadcast && ip_addr_isany(&pcb->local_ip)) \|\|
dcoban	0:1a61c61d0845	176	ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) \|\|
dcoban	0:1a61c61d0845	177	#if LWIP_IGMP
dcoban	0:1a61c61d0845	178	ip_addr_ismulticast(&current_iphdr_dest) \|\|
dcoban	0:1a61c61d0845	179	#endif /* LWIP_IGMP */
dcoban	0:1a61c61d0845	180	#if IP_SOF_BROADCAST_RECV
dcoban	0:1a61c61d0845	181	(broadcast && (pcb->so_options & SOF_BROADCAST)))) {
dcoban	0:1a61c61d0845	182	#else /* IP_SOF_BROADCAST_RECV */
dcoban	0:1a61c61d0845	183	(broadcast))) {
dcoban	0:1a61c61d0845	184	#endif /* IP_SOF_BROADCAST_RECV */
dcoban	0:1a61c61d0845	185	local_match = 1;
dcoban	0:1a61c61d0845	186	if ((uncon_pcb == NULL) &&
dcoban	0:1a61c61d0845	187	((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
dcoban	0:1a61c61d0845	188	/* the first unconnected matching PCB */
dcoban	0:1a61c61d0845	189	uncon_pcb = pcb;
dcoban	0:1a61c61d0845	190	}
dcoban	0:1a61c61d0845	191	}
dcoban	0:1a61c61d0845	192	/* compare PCB remote addr+port to UDP source addr+port */
dcoban	0:1a61c61d0845	193	if ((local_match != 0) &&
dcoban	0:1a61c61d0845	194	(pcb->remote_port == src) &&
dcoban	0:1a61c61d0845	195	(ip_addr_isany(&pcb->remote_ip) \|\|
dcoban	0:1a61c61d0845	196	ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
dcoban	0:1a61c61d0845	197	/* the first fully matching PCB */
dcoban	0:1a61c61d0845	198	if (prev != NULL) {
dcoban	0:1a61c61d0845	199	/* move the pcb to the front of udp_pcbs so that is
dcoban	0:1a61c61d0845	200	found faster next time */
dcoban	0:1a61c61d0845	201	prev->next = pcb->next;
dcoban	0:1a61c61d0845	202	pcb->next = udp_pcbs;
dcoban	0:1a61c61d0845	203	udp_pcbs = pcb;
dcoban	0:1a61c61d0845	204	} else {
dcoban	0:1a61c61d0845	205	UDP_STATS_INC(udp.cachehit);
dcoban	0:1a61c61d0845	206	}
dcoban	0:1a61c61d0845	207	break;
dcoban	0:1a61c61d0845	208	}
dcoban	0:1a61c61d0845	209	prev = pcb;
dcoban	0:1a61c61d0845	210	}
dcoban	0:1a61c61d0845	211	/* no fully matching pcb found? then look for an unconnected pcb */
dcoban	0:1a61c61d0845	212	if (pcb == NULL) {
dcoban	0:1a61c61d0845	213	pcb = uncon_pcb;
dcoban	0:1a61c61d0845	214	}
dcoban	0:1a61c61d0845	215	}
dcoban	0:1a61c61d0845	216
dcoban	0:1a61c61d0845	217	/* Check checksum if this is a match or if it was directed at us. */
dcoban	0:1a61c61d0845	218	if (pcb != NULL \|\| ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
dcoban	0:1a61c61d0845	219	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
dcoban	0:1a61c61d0845	220	#if LWIP_UDPLITE
dcoban	0:1a61c61d0845	221	if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
dcoban	0:1a61c61d0845	222	/* Do the UDP Lite checksum */
dcoban	0:1a61c61d0845	223	#if CHECKSUM_CHECK_UDP
dcoban	0:1a61c61d0845	224	u16_t chklen = ntohs(udphdr->len);
dcoban	0:1a61c61d0845	225	if (chklen < sizeof(struct udp_hdr)) {
dcoban	0:1a61c61d0845	226	if (chklen == 0) {
dcoban	0:1a61c61d0845	227	/* For UDP-Lite, checksum length of 0 means checksum
dcoban	0:1a61c61d0845	228	over the complete packet (See RFC 3828 chap. 3.1) */
dcoban	0:1a61c61d0845	229	chklen = p->tot_len;
dcoban	0:1a61c61d0845	230	} else {
dcoban	0:1a61c61d0845	231	/* At least the UDP-Lite header must be covered by the
dcoban	0:1a61c61d0845	232	checksum! (Again, see RFC 3828 chap. 3.1) */
dcoban	0:1a61c61d0845	233	UDP_STATS_INC(udp.chkerr);
dcoban	0:1a61c61d0845	234	UDP_STATS_INC(udp.drop);
dcoban	0:1a61c61d0845	235	snmp_inc_udpinerrors();
dcoban	0:1a61c61d0845	236	pbuf_free(p);
dcoban	0:1a61c61d0845	237	goto end;
dcoban	0:1a61c61d0845	238	}
dcoban	0:1a61c61d0845	239	}
dcoban	0:1a61c61d0845	240	if (inet_chksum_pseudo_partial(p, &current_iphdr_src, &current_iphdr_dest,
dcoban	0:1a61c61d0845	241	IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
dcoban	0:1a61c61d0845	242	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
dcoban	0:1a61c61d0845	243	("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
dcoban	0:1a61c61d0845	244	UDP_STATS_INC(udp.chkerr);
dcoban	0:1a61c61d0845	245	UDP_STATS_INC(udp.drop);
dcoban	0:1a61c61d0845	246	snmp_inc_udpinerrors();
dcoban	0:1a61c61d0845	247	pbuf_free(p);
dcoban	0:1a61c61d0845	248	goto end;
dcoban	0:1a61c61d0845	249	}
dcoban	0:1a61c61d0845	250	#endif /* CHECKSUM_CHECK_UDP */
dcoban	0:1a61c61d0845	251	} else
dcoban	0:1a61c61d0845	252	#endif /* LWIP_UDPLITE */
dcoban	0:1a61c61d0845	253	{
dcoban	0:1a61c61d0845	254	#if CHECKSUM_CHECK_UDP
dcoban	0:1a61c61d0845	255	if (udphdr->chksum != 0) {
dcoban	0:1a61c61d0845	256	if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
dcoban	0:1a61c61d0845	257	IP_PROTO_UDP, p->tot_len) != 0) {
dcoban	0:1a61c61d0845	258	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
dcoban	0:1a61c61d0845	259	("udp_input: UDP datagram discarded due to failing checksum\n"));
dcoban	0:1a61c61d0845	260	UDP_STATS_INC(udp.chkerr);
dcoban	0:1a61c61d0845	261	UDP_STATS_INC(udp.drop);
dcoban	0:1a61c61d0845	262	snmp_inc_udpinerrors();
dcoban	0:1a61c61d0845	263	pbuf_free(p);
dcoban	0:1a61c61d0845	264	goto end;
dcoban	0:1a61c61d0845	265	}
dcoban	0:1a61c61d0845	266	}
dcoban	0:1a61c61d0845	267	#endif /* CHECKSUM_CHECK_UDP */
dcoban	0:1a61c61d0845	268	}
dcoban	0:1a61c61d0845	269	if(pbuf_header(p, -UDP_HLEN)) {
dcoban	0:1a61c61d0845	270	/* Can we cope with this failing? Just assert for now */
dcoban	0:1a61c61d0845	271	LWIP_ASSERT("pbuf_header failed\n", 0);
dcoban	0:1a61c61d0845	272	UDP_STATS_INC(udp.drop);
dcoban	0:1a61c61d0845	273	snmp_inc_udpinerrors();
dcoban	0:1a61c61d0845	274	pbuf_free(p);
dcoban	0:1a61c61d0845	275	goto end;
dcoban	0:1a61c61d0845	276	}
dcoban	0:1a61c61d0845	277	if (pcb != NULL) {
dcoban	0:1a61c61d0845	278	snmp_inc_udpindatagrams();
dcoban	0:1a61c61d0845	279	#if SO_REUSE && SO_REUSE_RXTOALL
dcoban	0:1a61c61d0845	280	if ((broadcast \|\| ip_addr_ismulticast(&current_iphdr_dest)) &&
dcoban	0:1a61c61d0845	281	((pcb->so_options & SOF_REUSEADDR) != 0)) {
dcoban	0:1a61c61d0845	282	/* pass broadcast- or multicast packets to all multicast pcbs
dcoban	0:1a61c61d0845	283	if SOF_REUSEADDR is set on the first match */
dcoban	0:1a61c61d0845	284	struct udp_pcb *mpcb;
dcoban	0:1a61c61d0845	285	u8_t p_header_changed = 0;
dcoban	0:1a61c61d0845	286	for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
dcoban	0:1a61c61d0845	287	if (mpcb != pcb) {
dcoban	0:1a61c61d0845	288	/* compare PCB local addr+port to UDP destination addr+port */
dcoban	0:1a61c61d0845	289	if ((mpcb->local_port == dest) &&
dcoban	0:1a61c61d0845	290	((!broadcast && ip_addr_isany(&mpcb->local_ip)) \|\|
dcoban	0:1a61c61d0845	291	ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) \|\|
dcoban	0:1a61c61d0845	292	#if LWIP_IGMP
dcoban	0:1a61c61d0845	293	ip_addr_ismulticast(&current_iphdr_dest) \|\|
dcoban	0:1a61c61d0845	294	#endif /* LWIP_IGMP */
dcoban	0:1a61c61d0845	295	#if IP_SOF_BROADCAST_RECV
dcoban	0:1a61c61d0845	296	(broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
dcoban	0:1a61c61d0845	297	#else /* IP_SOF_BROADCAST_RECV */
dcoban	0:1a61c61d0845	298	(broadcast))) {
dcoban	0:1a61c61d0845	299	#endif /* IP_SOF_BROADCAST_RECV */
dcoban	0:1a61c61d0845	300	/* pass a copy of the packet to all local matches */
dcoban	0:1a61c61d0845	301	if (mpcb->recv != NULL) {
dcoban	0:1a61c61d0845	302	struct pbuf *q;
dcoban	0:1a61c61d0845	303	/* for that, move payload to IP header again */
dcoban	0:1a61c61d0845	304	if (p_header_changed == 0) {
dcoban	0:1a61c61d0845	305	pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
dcoban	0:1a61c61d0845	306	p_header_changed = 1;
dcoban	0:1a61c61d0845	307	}
dcoban	0:1a61c61d0845	308	q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
dcoban	0:1a61c61d0845	309	if (q != NULL) {
dcoban	0:1a61c61d0845	310	err_t err = pbuf_copy(q, p);
dcoban	0:1a61c61d0845	311	if (err == ERR_OK) {
dcoban	0:1a61c61d0845	312	/* move payload to UDP data */
dcoban	0:1a61c61d0845	313	pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
dcoban	0:1a61c61d0845	314	mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
dcoban	0:1a61c61d0845	315	}
dcoban	0:1a61c61d0845	316	}
dcoban	0:1a61c61d0845	317	}
dcoban	0:1a61c61d0845	318	}
dcoban	0:1a61c61d0845	319	}
dcoban	0:1a61c61d0845	320	}
dcoban	0:1a61c61d0845	321	if (p_header_changed) {
dcoban	0:1a61c61d0845	322	/* and move payload to UDP data again */
dcoban	0:1a61c61d0845	323	pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
dcoban	0:1a61c61d0845	324	}
dcoban	0:1a61c61d0845	325	}
dcoban	0:1a61c61d0845	326	#endif /* SO_REUSE && SO_REUSE_RXTOALL */
dcoban	0:1a61c61d0845	327	/* callback */
dcoban	0:1a61c61d0845	328	if (pcb->recv != NULL) {
dcoban	0:1a61c61d0845	329	/* now the recv function is responsible for freeing p */
dcoban	0:1a61c61d0845	330	pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
dcoban	0:1a61c61d0845	331	} else {
dcoban	0:1a61c61d0845	332	/* no recv function registered? then we have to free the pbuf! */
dcoban	0:1a61c61d0845	333	pbuf_free(p);
dcoban	0:1a61c61d0845	334	goto end;
dcoban	0:1a61c61d0845	335	}
dcoban	0:1a61c61d0845	336	} else {
dcoban	0:1a61c61d0845	337	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
dcoban	0:1a61c61d0845	338
dcoban	0:1a61c61d0845	339	#if LWIP_ICMP
dcoban	0:1a61c61d0845	340	/* No match was found, send ICMP destination port unreachable unless
dcoban	0:1a61c61d0845	341	destination address was broadcast/multicast. */
dcoban	0:1a61c61d0845	342	if (!broadcast &&
dcoban	0:1a61c61d0845	343	!ip_addr_ismulticast(&current_iphdr_dest)) {
dcoban	0:1a61c61d0845	344	/* move payload pointer back to ip header */
dcoban	0:1a61c61d0845	345	pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
dcoban	0:1a61c61d0845	346	LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
dcoban	0:1a61c61d0845	347	icmp_dest_unreach(p, ICMP_DUR_PORT);
dcoban	0:1a61c61d0845	348	}
dcoban	0:1a61c61d0845	349	#endif /* LWIP_ICMP */
dcoban	0:1a61c61d0845	350	UDP_STATS_INC(udp.proterr);
dcoban	0:1a61c61d0845	351	UDP_STATS_INC(udp.drop);
dcoban	0:1a61c61d0845	352	snmp_inc_udpnoports();
dcoban	0:1a61c61d0845	353	pbuf_free(p);
dcoban	0:1a61c61d0845	354	}
dcoban	0:1a61c61d0845	355	} else {
dcoban	0:1a61c61d0845	356	pbuf_free(p);
dcoban	0:1a61c61d0845	357	}
dcoban	0:1a61c61d0845	358	end:
dcoban	0:1a61c61d0845	359	PERF_STOP("udp_input");
dcoban	0:1a61c61d0845	360	}
dcoban	0:1a61c61d0845	361
dcoban	0:1a61c61d0845	362	/**
dcoban	0:1a61c61d0845	363	* Send data using UDP.
dcoban	0:1a61c61d0845	364	*
dcoban	0:1a61c61d0845	365	* @param pcb UDP PCB used to send the data.
dcoban	0:1a61c61d0845	366	* @param p chain of pbuf's to be sent.
dcoban	0:1a61c61d0845	367	*
dcoban	0:1a61c61d0845	368	* The datagram will be sent to the current remote_ip & remote_port
dcoban	0:1a61c61d0845	369	* stored in pcb. If the pcb is not bound to a port, it will
dcoban	0:1a61c61d0845	370	* automatically be bound to a random port.
dcoban	0:1a61c61d0845	371	*
dcoban	0:1a61c61d0845	372	* @return lwIP error code.
dcoban	0:1a61c61d0845	373	* - ERR_OK. Successful. No error occured.
dcoban	0:1a61c61d0845	374	* - ERR_MEM. Out of memory.
dcoban	0:1a61c61d0845	375	* - ERR_RTE. Could not find route to destination address.
dcoban	0:1a61c61d0845	376	* - More errors could be returned by lower protocol layers.
dcoban	0:1a61c61d0845	377	*
dcoban	0:1a61c61d0845	378	* @see udp_disconnect() udp_sendto()
dcoban	0:1a61c61d0845	379	*/
dcoban	0:1a61c61d0845	380	err_t
dcoban	0:1a61c61d0845	381	udp_send(struct udp_pcb pcb, struct pbuf p)
dcoban	0:1a61c61d0845	382	{
dcoban	0:1a61c61d0845	383	/* send to the packet using remote ip and port stored in the pcb */
dcoban	0:1a61c61d0845	384	return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
dcoban	0:1a61c61d0845	385	}
dcoban	0:1a61c61d0845	386
dcoban	0:1a61c61d0845	387	#if LWIP_CHECKSUM_ON_COPY
dcoban	0:1a61c61d0845	388	/** Same as udp_send() but with checksum
dcoban	0:1a61c61d0845	389	*/
dcoban	0:1a61c61d0845	390	err_t
dcoban	0:1a61c61d0845	391	udp_send_chksum(struct udp_pcb pcb, struct pbuf p,
dcoban	0:1a61c61d0845	392	u8_t have_chksum, u16_t chksum)
dcoban	0:1a61c61d0845	393	{
dcoban	0:1a61c61d0845	394	/* send to the packet using remote ip and port stored in the pcb */
dcoban	0:1a61c61d0845	395	return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
dcoban	0:1a61c61d0845	396	have_chksum, chksum);
dcoban	0:1a61c61d0845	397	}
dcoban	0:1a61c61d0845	398	#endif /* LWIP_CHECKSUM_ON_COPY */
dcoban	0:1a61c61d0845	399
dcoban	0:1a61c61d0845	400	/**
dcoban	0:1a61c61d0845	401	* Send data to a specified address using UDP.
dcoban	0:1a61c61d0845	402	*
dcoban	0:1a61c61d0845	403	* @param pcb UDP PCB used to send the data.
dcoban	0:1a61c61d0845	404	* @param p chain of pbuf's to be sent.
dcoban	0:1a61c61d0845	405	* @param dst_ip Destination IP address.
dcoban	0:1a61c61d0845	406	* @param dst_port Destination UDP port.
dcoban	0:1a61c61d0845	407	*
dcoban	0:1a61c61d0845	408	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
dcoban	0:1a61c61d0845	409	*
dcoban	0:1a61c61d0845	410	* If the PCB already has a remote address association, it will
dcoban	0:1a61c61d0845	411	* be restored after the data is sent.
dcoban	0:1a61c61d0845	412	*
dcoban	0:1a61c61d0845	413	* @return lwIP error code (@see udp_send for possible error codes)
dcoban	0:1a61c61d0845	414	*
dcoban	0:1a61c61d0845	415	* @see udp_disconnect() udp_send()
dcoban	0:1a61c61d0845	416	*/
dcoban	0:1a61c61d0845	417	err_t
dcoban	0:1a61c61d0845	418	udp_sendto(struct udp_pcb pcb, struct pbuf p,
dcoban	0:1a61c61d0845	419	ip_addr_t *dst_ip, u16_t dst_port)
dcoban	0:1a61c61d0845	420	{
dcoban	0:1a61c61d0845	421	#if LWIP_CHECKSUM_ON_COPY
dcoban	0:1a61c61d0845	422	return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
dcoban	0:1a61c61d0845	423	}
dcoban	0:1a61c61d0845	424
dcoban	0:1a61c61d0845	425	/** Same as udp_sendto(), but with checksum */
dcoban	0:1a61c61d0845	426	err_t
dcoban	0:1a61c61d0845	427	udp_sendto_chksum(struct udp_pcb pcb, struct pbuf p, ip_addr_t *dst_ip,
dcoban	0:1a61c61d0845	428	u16_t dst_port, u8_t have_chksum, u16_t chksum)
dcoban	0:1a61c61d0845	429	{
dcoban	0:1a61c61d0845	430	#endif /* LWIP_CHECKSUM_ON_COPY */
dcoban	0:1a61c61d0845	431	struct netif *netif;
dcoban	0:1a61c61d0845	432
dcoban	0:1a61c61d0845	433	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send\n"));
dcoban	0:1a61c61d0845	434
dcoban	0:1a61c61d0845	435	/* find the outgoing network interface for this packet */
dcoban	0:1a61c61d0845	436	#if LWIP_IGMP
dcoban	0:1a61c61d0845	437	netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
dcoban	0:1a61c61d0845	438	#else
dcoban	0:1a61c61d0845	439	netif = ip_route(dst_ip);
dcoban	0:1a61c61d0845	440	#endif /* LWIP_IGMP */
dcoban	0:1a61c61d0845	441
dcoban	0:1a61c61d0845	442	/* no outgoing network interface could be found? */
dcoban	0:1a61c61d0845	443	if (netif == NULL) {
dcoban	0:1a61c61d0845	444	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
dcoban	0:1a61c61d0845	445	ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
dcoban	0:1a61c61d0845	446	UDP_STATS_INC(udp.rterr);
dcoban	0:1a61c61d0845	447	return ERR_RTE;
dcoban	0:1a61c61d0845	448	}
dcoban	0:1a61c61d0845	449	#if LWIP_CHECKSUM_ON_COPY
dcoban	0:1a61c61d0845	450	return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
dcoban	0:1a61c61d0845	451	#else /* LWIP_CHECKSUM_ON_COPY */
dcoban	0:1a61c61d0845	452	return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
dcoban	0:1a61c61d0845	453	#endif /* LWIP_CHECKSUM_ON_COPY */
dcoban	0:1a61c61d0845	454	}
dcoban	0:1a61c61d0845	455
dcoban	0:1a61c61d0845	456	/**
dcoban	0:1a61c61d0845	457	* Send data to a specified address using UDP.
dcoban	0:1a61c61d0845	458	* The netif used for sending can be specified.
dcoban	0:1a61c61d0845	459	*
dcoban	0:1a61c61d0845	460	* This function exists mainly for DHCP, to be able to send UDP packets
dcoban	0:1a61c61d0845	461	* on a netif that is still down.
dcoban	0:1a61c61d0845	462	*
dcoban	0:1a61c61d0845	463	* @param pcb UDP PCB used to send the data.
dcoban	0:1a61c61d0845	464	* @param p chain of pbuf's to be sent.
dcoban	0:1a61c61d0845	465	* @param dst_ip Destination IP address.
dcoban	0:1a61c61d0845	466	* @param dst_port Destination UDP port.
dcoban	0:1a61c61d0845	467	* @param netif the netif used for sending.
dcoban	0:1a61c61d0845	468	*
dcoban	0:1a61c61d0845	469	* dst_ip & dst_port are expected to be in the same byte order as in the pcb.
dcoban	0:1a61c61d0845	470	*
dcoban	0:1a61c61d0845	471	* @return lwIP error code (@see udp_send for possible error codes)
dcoban	0:1a61c61d0845	472	*
dcoban	0:1a61c61d0845	473	* @see udp_disconnect() udp_send()
dcoban	0:1a61c61d0845	474	*/
dcoban	0:1a61c61d0845	475	err_t
dcoban	0:1a61c61d0845	476	udp_sendto_if(struct udp_pcb pcb, struct pbuf p,
dcoban	0:1a61c61d0845	477	ip_addr_t dst_ip, u16_t dst_port, struct netif netif)
dcoban	0:1a61c61d0845	478	{
dcoban	0:1a61c61d0845	479	#if LWIP_CHECKSUM_ON_COPY
dcoban	0:1a61c61d0845	480	return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
dcoban	0:1a61c61d0845	481	}
dcoban	0:1a61c61d0845	482
dcoban	0:1a61c61d0845	483	/** Same as udp_sendto_if(), but with checksum */
dcoban	0:1a61c61d0845	484	err_t
dcoban	0:1a61c61d0845	485	udp_sendto_if_chksum(struct udp_pcb pcb, struct pbuf p, ip_addr_t *dst_ip,
dcoban	0:1a61c61d0845	486	u16_t dst_port, struct netif *netif, u8_t have_chksum,
dcoban	0:1a61c61d0845	487	u16_t chksum)
dcoban	0:1a61c61d0845	488	{
dcoban	0:1a61c61d0845	489	#endif /* LWIP_CHECKSUM_ON_COPY */
dcoban	0:1a61c61d0845	490	struct udp_hdr *udphdr;
dcoban	0:1a61c61d0845	491	ip_addr_t *src_ip;
dcoban	0:1a61c61d0845	492	err_t err;
dcoban	0:1a61c61d0845	493	struct pbuf q; / q will be sent down the stack */
dcoban	0:1a61c61d0845	494
dcoban	0:1a61c61d0845	495	#if IP_SOF_BROADCAST
dcoban	0:1a61c61d0845	496	/* broadcast filter? */
dcoban	0:1a61c61d0845	497	if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
dcoban	0:1a61c61d0845	498	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_LEVEL_SERIOUS,
dcoban	0:1a61c61d0845	499	("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
dcoban	0:1a61c61d0845	500	return ERR_VAL;
dcoban	0:1a61c61d0845	501	}
dcoban	0:1a61c61d0845	502	#endif /* IP_SOF_BROADCAST */
dcoban	0:1a61c61d0845	503
dcoban	0:1a61c61d0845	504	/* if the PCB is not yet bound to a port, bind it here */
dcoban	0:1a61c61d0845	505	if (pcb->local_port == 0) {
dcoban	0:1a61c61d0845	506	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
dcoban	0:1a61c61d0845	507	err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
dcoban	0:1a61c61d0845	508	if (err != ERR_OK) {
dcoban	0:1a61c61d0845	509	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
dcoban	0:1a61c61d0845	510	return err;
dcoban	0:1a61c61d0845	511	}
dcoban	0:1a61c61d0845	512	}
dcoban	0:1a61c61d0845	513
dcoban	0:1a61c61d0845	514	/* not enough space to add an UDP header to first pbuf in given p chain? */
dcoban	0:1a61c61d0845	515	if (pbuf_header(p, UDP_HLEN)) {
dcoban	0:1a61c61d0845	516	/* allocate header in a separate new pbuf */
dcoban	0:1a61c61d0845	517	q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
dcoban	0:1a61c61d0845	518	/* new header pbuf could not be allocated? */
dcoban	0:1a61c61d0845	519	if (q == NULL) {
dcoban	0:1a61c61d0845	520	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
dcoban	0:1a61c61d0845	521	return ERR_MEM;
dcoban	0:1a61c61d0845	522	}
dcoban	0:1a61c61d0845	523	/* chain header q in front of given pbuf p */
dcoban	0:1a61c61d0845	524	pbuf_chain(q, p);
dcoban	0:1a61c61d0845	525	/* first pbuf q points to header pbuf */
dcoban	0:1a61c61d0845	526	LWIP_DEBUGF(UDP_DEBUG,
dcoban	0:1a61c61d0845	527	("udp_send: added header pbuf %p before given pbuf %p\n", (void )q, (void )p));
dcoban	0:1a61c61d0845	528	} else {
dcoban	0:1a61c61d0845	529	/* adding space for header within p succeeded */
dcoban	0:1a61c61d0845	530	/* first pbuf q equals given pbuf */
dcoban	0:1a61c61d0845	531	q = p;
dcoban	0:1a61c61d0845	532	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
dcoban	0:1a61c61d0845	533	}
dcoban	0:1a61c61d0845	534	LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
dcoban	0:1a61c61d0845	535	(q->len >= sizeof(struct udp_hdr)));
dcoban	0:1a61c61d0845	536	/* q now represents the packet to be sent */
dcoban	0:1a61c61d0845	537	udphdr = (struct udp_hdr *)q->payload;
dcoban	0:1a61c61d0845	538	udphdr->src = htons(pcb->local_port);
dcoban	0:1a61c61d0845	539	udphdr->dest = htons(dst_port);
dcoban	0:1a61c61d0845	540	/* in UDP, 0 checksum means 'no checksum' */
dcoban	0:1a61c61d0845	541	udphdr->chksum = 0x0000;
dcoban	0:1a61c61d0845	542
dcoban	0:1a61c61d0845	543	/* Multicast Loop? */
dcoban	0:1a61c61d0845	544	#if LWIP_IGMP
dcoban	0:1a61c61d0845	545	if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
dcoban	0:1a61c61d0845	546	q->flags \|= PBUF_FLAG_MCASTLOOP;
dcoban	0:1a61c61d0845	547	}
dcoban	0:1a61c61d0845	548	#endif /* LWIP_IGMP */
dcoban	0:1a61c61d0845	549
dcoban	0:1a61c61d0845	550
dcoban	0:1a61c61d0845	551	/* PCB local address is IP_ANY_ADDR? */
dcoban	0:1a61c61d0845	552	if (ip_addr_isany(&pcb->local_ip)) {
dcoban	0:1a61c61d0845	553	/* use outgoing network interface IP address as source address */
dcoban	0:1a61c61d0845	554	src_ip = &(netif->ip_addr);
dcoban	0:1a61c61d0845	555	} else {
dcoban	0:1a61c61d0845	556	/* check if UDP PCB local IP address is correct
dcoban	0:1a61c61d0845	557	* this could be an old address if netif->ip_addr has changed */
dcoban	0:1a61c61d0845	558	if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
dcoban	0:1a61c61d0845	559	/* local_ip doesn't match, drop the packet */
dcoban	0:1a61c61d0845	560	if (q != p) {
dcoban	0:1a61c61d0845	561	/* free the header pbuf */
dcoban	0:1a61c61d0845	562	pbuf_free(q);
dcoban	0:1a61c61d0845	563	q = NULL;
dcoban	0:1a61c61d0845	564	/* p is still referenced by the caller, and will live on */
dcoban	0:1a61c61d0845	565	}
dcoban	0:1a61c61d0845	566	return ERR_VAL;
dcoban	0:1a61c61d0845	567	}
dcoban	0:1a61c61d0845	568	/* use UDP PCB local IP address as source address */
dcoban	0:1a61c61d0845	569	src_ip = &(pcb->local_ip);
dcoban	0:1a61c61d0845	570	}
dcoban	0:1a61c61d0845	571
dcoban	0:1a61c61d0845	572	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
dcoban	0:1a61c61d0845	573
dcoban	0:1a61c61d0845	574	#if LWIP_UDPLITE
dcoban	0:1a61c61d0845	575	/* UDP Lite protocol? */
dcoban	0:1a61c61d0845	576	if (pcb->flags & UDP_FLAGS_UDPLITE) {
dcoban	0:1a61c61d0845	577	u16_t chklen, chklen_hdr;
dcoban	0:1a61c61d0845	578	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
dcoban	0:1a61c61d0845	579	/* set UDP message length in UDP header */
dcoban	0:1a61c61d0845	580	chklen_hdr = chklen = pcb->chksum_len_tx;
dcoban	0:1a61c61d0845	581	if ((chklen < sizeof(struct udp_hdr)) \|\| (chklen > q->tot_len)) {
dcoban	0:1a61c61d0845	582	if (chklen != 0) {
dcoban	0:1a61c61d0845	583	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
dcoban	0:1a61c61d0845	584	}
dcoban	0:1a61c61d0845	585	/* For UDP-Lite, checksum length of 0 means checksum
dcoban	0:1a61c61d0845	586	over the complete packet. (See RFC 3828 chap. 3.1)
dcoban	0:1a61c61d0845	587	At least the UDP-Lite header must be covered by the
dcoban	0:1a61c61d0845	588	checksum, therefore, if chksum_len has an illegal
dcoban	0:1a61c61d0845	589	value, we generate the checksum over the complete
dcoban	0:1a61c61d0845	590	packet to be safe. */
dcoban	0:1a61c61d0845	591	chklen_hdr = 0;
dcoban	0:1a61c61d0845	592	chklen = q->tot_len;
dcoban	0:1a61c61d0845	593	}
dcoban	0:1a61c61d0845	594	udphdr->len = htons(chklen_hdr);
dcoban	0:1a61c61d0845	595	/* calculate checksum */
dcoban	0:1a61c61d0845	596	#if CHECKSUM_GEN_UDP
dcoban	0:1a61c61d0845	597	udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
dcoban	0:1a61c61d0845	598	IP_PROTO_UDPLITE, q->tot_len,
dcoban	0:1a61c61d0845	599	#if !LWIP_CHECKSUM_ON_COPY
dcoban	0:1a61c61d0845	600	chklen);
dcoban	0:1a61c61d0845	601	#else /* !LWIP_CHECKSUM_ON_COPY */
dcoban	0:1a61c61d0845	602	(have_chksum ? UDP_HLEN : chklen));
dcoban	0:1a61c61d0845	603	if (have_chksum) {
dcoban	0:1a61c61d0845	604	u32_t acc;
dcoban	0:1a61c61d0845	605	acc = udphdr->chksum + (u16_t)~(chksum);
dcoban	0:1a61c61d0845	606	udphdr->chksum = FOLD_U32T(acc);
dcoban	0:1a61c61d0845	607	}
dcoban	0:1a61c61d0845	608	#endif /* !LWIP_CHECKSUM_ON_COPY */
dcoban	0:1a61c61d0845	609
dcoban	0:1a61c61d0845	610	/* chksum zero must become 0xffff, as zero means 'no checksum' */
dcoban	0:1a61c61d0845	611	if (udphdr->chksum == 0x0000) {
dcoban	0:1a61c61d0845	612	udphdr->chksum = 0xffff;
dcoban	0:1a61c61d0845	613	}
dcoban	0:1a61c61d0845	614	#endif /* CHECKSUM_GEN_UDP */
dcoban	0:1a61c61d0845	615	/* output to IP */
dcoban	0:1a61c61d0845	616	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
dcoban	0:1a61c61d0845	617	#if LWIP_NETIF_HWADDRHINT
dcoban	0:1a61c61d0845	618	netif->addr_hint = &(pcb->addr_hint);
dcoban	0:1a61c61d0845	619	#endif /* LWIP_NETIF_HWADDRHINT*/
dcoban	0:1a61c61d0845	620	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
dcoban	0:1a61c61d0845	621	#if LWIP_NETIF_HWADDRHINT
dcoban	0:1a61c61d0845	622	netif->addr_hint = NULL;
dcoban	0:1a61c61d0845	623	#endif /* LWIP_NETIF_HWADDRHINT*/
dcoban	0:1a61c61d0845	624	} else
dcoban	0:1a61c61d0845	625	#endif /* LWIP_UDPLITE */
dcoban	0:1a61c61d0845	626	{ /* UDP */
dcoban	0:1a61c61d0845	627	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
dcoban	0:1a61c61d0845	628	udphdr->len = htons(q->tot_len);
dcoban	0:1a61c61d0845	629	/* calculate checksum */
dcoban	0:1a61c61d0845	630	#if CHECKSUM_GEN_UDP
dcoban	0:1a61c61d0845	631	if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
dcoban	0:1a61c61d0845	632	u16_t udpchksum;
dcoban	0:1a61c61d0845	633	#if LWIP_CHECKSUM_ON_COPY
dcoban	0:1a61c61d0845	634	if (have_chksum) {
dcoban	0:1a61c61d0845	635	u32_t acc;
dcoban	0:1a61c61d0845	636	udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
dcoban	0:1a61c61d0845	637	q->tot_len, UDP_HLEN);
dcoban	0:1a61c61d0845	638	acc = udpchksum + (u16_t)~(chksum);
dcoban	0:1a61c61d0845	639	udpchksum = FOLD_U32T(acc);
dcoban	0:1a61c61d0845	640	} else
dcoban	0:1a61c61d0845	641	#endif /* LWIP_CHECKSUM_ON_COPY */
dcoban	0:1a61c61d0845	642	{
dcoban	0:1a61c61d0845	643	udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
dcoban	0:1a61c61d0845	644	}
dcoban	0:1a61c61d0845	645
dcoban	0:1a61c61d0845	646	/* chksum zero must become 0xffff, as zero means 'no checksum' */
dcoban	0:1a61c61d0845	647	if (udpchksum == 0x0000) {
dcoban	0:1a61c61d0845	648	udpchksum = 0xffff;
dcoban	0:1a61c61d0845	649	}
dcoban	0:1a61c61d0845	650	udphdr->chksum = udpchksum;
dcoban	0:1a61c61d0845	651	}
dcoban	0:1a61c61d0845	652	#endif /* CHECKSUM_GEN_UDP */
dcoban	0:1a61c61d0845	653	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
dcoban	0:1a61c61d0845	654	LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
dcoban	0:1a61c61d0845	655	/* output to IP */
dcoban	0:1a61c61d0845	656	#if LWIP_NETIF_HWADDRHINT
dcoban	0:1a61c61d0845	657	netif->addr_hint = &(pcb->addr_hint);
dcoban	0:1a61c61d0845	658	#endif /* LWIP_NETIF_HWADDRHINT*/
dcoban	0:1a61c61d0845	659	err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
dcoban	0:1a61c61d0845	660	#if LWIP_NETIF_HWADDRHINT
dcoban	0:1a61c61d0845	661	netif->addr_hint = NULL;
dcoban	0:1a61c61d0845	662	#endif /* LWIP_NETIF_HWADDRHINT*/
dcoban	0:1a61c61d0845	663	}
dcoban	0:1a61c61d0845	664	/* TODO: must this be increased even if error occured? */
dcoban	0:1a61c61d0845	665	snmp_inc_udpoutdatagrams();
dcoban	0:1a61c61d0845	666
dcoban	0:1a61c61d0845	667	/* did we chain a separate header pbuf earlier? */
dcoban	0:1a61c61d0845	668	if (q != p) {
dcoban	0:1a61c61d0845	669	/* free the header pbuf */
dcoban	0:1a61c61d0845	670	pbuf_free(q);
dcoban	0:1a61c61d0845	671	q = NULL;
dcoban	0:1a61c61d0845	672	/* p is still referenced by the caller, and will live on */
dcoban	0:1a61c61d0845	673	}
dcoban	0:1a61c61d0845	674
dcoban	0:1a61c61d0845	675	UDP_STATS_INC(udp.xmit);
dcoban	0:1a61c61d0845	676	return err;
dcoban	0:1a61c61d0845	677	}
dcoban	0:1a61c61d0845	678
dcoban	0:1a61c61d0845	679	/**
dcoban	0:1a61c61d0845	680	* Bind an UDP PCB.
dcoban	0:1a61c61d0845	681	*
dcoban	0:1a61c61d0845	682	* @param pcb UDP PCB to be bound with a local address ipaddr and port.
dcoban	0:1a61c61d0845	683	* @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
dcoban	0:1a61c61d0845	684	* bind to all local interfaces.
dcoban	0:1a61c61d0845	685	* @param port local UDP port to bind with. Use 0 to automatically bind
dcoban	0:1a61c61d0845	686	* to a random port between UDP_LOCAL_PORT_RANGE_START and
dcoban	0:1a61c61d0845	687	* UDP_LOCAL_PORT_RANGE_END.
dcoban	0:1a61c61d0845	688	*
dcoban	0:1a61c61d0845	689	* ipaddr & port are expected to be in the same byte order as in the pcb.
dcoban	0:1a61c61d0845	690	*
dcoban	0:1a61c61d0845	691	* @return lwIP error code.
dcoban	0:1a61c61d0845	692	* - ERR_OK. Successful. No error occured.
dcoban	0:1a61c61d0845	693	* - ERR_USE. The specified ipaddr and port are already bound to by
dcoban	0:1a61c61d0845	694	* another UDP PCB.
dcoban	0:1a61c61d0845	695	*
dcoban	0:1a61c61d0845	696	* @see udp_disconnect()
dcoban	0:1a61c61d0845	697	*/
dcoban	0:1a61c61d0845	698	err_t
dcoban	0:1a61c61d0845	699	udp_bind(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
dcoban	0:1a61c61d0845	700	{
dcoban	0:1a61c61d0845	701	struct udp_pcb *ipcb;
dcoban	0:1a61c61d0845	702	u8_t rebind;
dcoban	0:1a61c61d0845	703
dcoban	0:1a61c61d0845	704	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
dcoban	0:1a61c61d0845	705	ip_addr_debug_print(UDP_DEBUG, ipaddr);
dcoban	0:1a61c61d0845	706	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
dcoban	0:1a61c61d0845	707
dcoban	0:1a61c61d0845	708	rebind = 0;
dcoban	0:1a61c61d0845	709	/* Check for double bind and rebind of the same pcb */
dcoban	0:1a61c61d0845	710	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
dcoban	0:1a61c61d0845	711	/* is this UDP PCB already on active list? */
dcoban	0:1a61c61d0845	712	if (pcb == ipcb) {
dcoban	0:1a61c61d0845	713	/* pcb may occur at most once in active list */
dcoban	0:1a61c61d0845	714	LWIP_ASSERT("rebind == 0", rebind == 0);
dcoban	0:1a61c61d0845	715	/* pcb already in list, just rebind */
dcoban	0:1a61c61d0845	716	rebind = 1;
dcoban	0:1a61c61d0845	717	}
dcoban	0:1a61c61d0845	718
dcoban	0:1a61c61d0845	719	/* By default, we don't allow to bind to a port that any other udp
dcoban	0:1a61c61d0845	720	PCB is alread bound to, unless all PCBs with that port have tha
dcoban	0:1a61c61d0845	721	REUSEADDR flag set. */
dcoban	0:1a61c61d0845	722	#if SO_REUSE
dcoban	0:1a61c61d0845	723	else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
dcoban	0:1a61c61d0845	724	((ipcb->so_options & SOF_REUSEADDR) == 0)) {
dcoban	0:1a61c61d0845	725	#else /* SO_REUSE */
dcoban	0:1a61c61d0845	726	/* port matches that of PCB in list and REUSEADDR not set -> reject */
dcoban	0:1a61c61d0845	727	else {
dcoban	0:1a61c61d0845	728	#endif /* SO_REUSE */
dcoban	0:1a61c61d0845	729	if ((ipcb->local_port == port) &&
dcoban	0:1a61c61d0845	730	/* IP address matches, or one is IP_ADDR_ANY? */
dcoban	0:1a61c61d0845	731	(ip_addr_isany(&(ipcb->local_ip)) \|\|
dcoban	0:1a61c61d0845	732	ip_addr_isany(ipaddr) \|\|
dcoban	0:1a61c61d0845	733	ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
dcoban	0:1a61c61d0845	734	/* other PCB already binds to this local IP and port */
dcoban	0:1a61c61d0845	735	LWIP_DEBUGF(UDP_DEBUG,
dcoban	0:1a61c61d0845	736	("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
dcoban	0:1a61c61d0845	737	return ERR_USE;
dcoban	0:1a61c61d0845	738	}
dcoban	0:1a61c61d0845	739	}
dcoban	0:1a61c61d0845	740	}
dcoban	0:1a61c61d0845	741
dcoban	0:1a61c61d0845	742	ip_addr_set(&pcb->local_ip, ipaddr);
dcoban	0:1a61c61d0845	743
dcoban	0:1a61c61d0845	744	/* no port specified? */
dcoban	0:1a61c61d0845	745	if (port == 0) {
dcoban	0:1a61c61d0845	746	#ifndef UDP_LOCAL_PORT_RANGE_START
dcoban	0:1a61c61d0845	747	#define UDP_LOCAL_PORT_RANGE_START 4096
dcoban	0:1a61c61d0845	748	#define UDP_LOCAL_PORT_RANGE_END 0x7fff
dcoban	0:1a61c61d0845	749	#endif
dcoban	0:1a61c61d0845	750	port = UDP_LOCAL_PORT_RANGE_START;
dcoban	0:1a61c61d0845	751	ipcb = udp_pcbs;
dcoban	0:1a61c61d0845	752	while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
dcoban	0:1a61c61d0845	753	if (ipcb->local_port == port) {
dcoban	0:1a61c61d0845	754	/* port is already used by another udp_pcb */
dcoban	0:1a61c61d0845	755	port++;
dcoban	0:1a61c61d0845	756	/* restart scanning all udp pcbs */
dcoban	0:1a61c61d0845	757	ipcb = udp_pcbs;
dcoban	0:1a61c61d0845	758	} else {
dcoban	0:1a61c61d0845	759	/* go on with next udp pcb */
dcoban	0:1a61c61d0845	760	ipcb = ipcb->next;
dcoban	0:1a61c61d0845	761	}
dcoban	0:1a61c61d0845	762	}
dcoban	0:1a61c61d0845	763	if (ipcb != NULL) {
dcoban	0:1a61c61d0845	764	/* no more ports available in local range */
dcoban	0:1a61c61d0845	765	LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
dcoban	0:1a61c61d0845	766	return ERR_USE;
dcoban	0:1a61c61d0845	767	}
dcoban	0:1a61c61d0845	768	}
dcoban	0:1a61c61d0845	769	pcb->local_port = port;
dcoban	0:1a61c61d0845	770	snmp_insert_udpidx_tree(pcb);
dcoban	0:1a61c61d0845	771	/* pcb not active yet? */
dcoban	0:1a61c61d0845	772	if (rebind == 0) {
dcoban	0:1a61c61d0845	773	/* place the PCB on the active list if not already there */
dcoban	0:1a61c61d0845	774	pcb->next = udp_pcbs;
dcoban	0:1a61c61d0845	775	udp_pcbs = pcb;
dcoban	0:1a61c61d0845	776	}
dcoban	0:1a61c61d0845	777	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
dcoban	0:1a61c61d0845	778	("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
dcoban	0:1a61c61d0845	779	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
dcoban	0:1a61c61d0845	780	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
dcoban	0:1a61c61d0845	781	pcb->local_port));
dcoban	0:1a61c61d0845	782	return ERR_OK;
dcoban	0:1a61c61d0845	783	}
dcoban	0:1a61c61d0845	784	/**
dcoban	0:1a61c61d0845	785	* Connect an UDP PCB.
dcoban	0:1a61c61d0845	786	*
dcoban	0:1a61c61d0845	787	* This will associate the UDP PCB with the remote address.
dcoban	0:1a61c61d0845	788	*
dcoban	0:1a61c61d0845	789	* @param pcb UDP PCB to be connected with remote address ipaddr and port.
dcoban	0:1a61c61d0845	790	* @param ipaddr remote IP address to connect with.
dcoban	0:1a61c61d0845	791	* @param port remote UDP port to connect with.
dcoban	0:1a61c61d0845	792	*
dcoban	0:1a61c61d0845	793	* @return lwIP error code
dcoban	0:1a61c61d0845	794	*
dcoban	0:1a61c61d0845	795	* ipaddr & port are expected to be in the same byte order as in the pcb.
dcoban	0:1a61c61d0845	796	*
dcoban	0:1a61c61d0845	797	* The udp pcb is bound to a random local port if not already bound.
dcoban	0:1a61c61d0845	798	*
dcoban	0:1a61c61d0845	799	* @see udp_disconnect()
dcoban	0:1a61c61d0845	800	*/
dcoban	0:1a61c61d0845	801	err_t
dcoban	0:1a61c61d0845	802	udp_connect(struct udp_pcb pcb, ip_addr_t ipaddr, u16_t port)
dcoban	0:1a61c61d0845	803	{
dcoban	0:1a61c61d0845	804	struct udp_pcb *ipcb;
dcoban	0:1a61c61d0845	805
dcoban	0:1a61c61d0845	806	if (pcb->local_port == 0) {
dcoban	0:1a61c61d0845	807	err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
dcoban	0:1a61c61d0845	808	if (err != ERR_OK) {
dcoban	0:1a61c61d0845	809	return err;
dcoban	0:1a61c61d0845	810	}
dcoban	0:1a61c61d0845	811	}
dcoban	0:1a61c61d0845	812
dcoban	0:1a61c61d0845	813	ip_addr_set(&pcb->remote_ip, ipaddr);
dcoban	0:1a61c61d0845	814	pcb->remote_port = port;
dcoban	0:1a61c61d0845	815	pcb->flags \|= UDP_FLAGS_CONNECTED;
dcoban	0:1a61c61d0845	816	/** TODO: this functionality belongs in upper layers */
dcoban	0:1a61c61d0845	817	#ifdef LWIP_UDP_TODO
dcoban	0:1a61c61d0845	818	/* Nail down local IP for netconn_addr()/getsockname() */
dcoban	0:1a61c61d0845	819	if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
dcoban	0:1a61c61d0845	820	struct netif *netif;
dcoban	0:1a61c61d0845	821
dcoban	0:1a61c61d0845	822	if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
dcoban	0:1a61c61d0845	823	LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
dcoban	0:1a61c61d0845	824	UDP_STATS_INC(udp.rterr);
dcoban	0:1a61c61d0845	825	return ERR_RTE;
dcoban	0:1a61c61d0845	826	}
dcoban	0:1a61c61d0845	827	/** TODO: this will bind the udp pcb locally, to the interface which
dcoban	0:1a61c61d0845	828	is used to route output packets to the remote address. However, we
dcoban	0:1a61c61d0845	829	might want to accept incoming packets on any interface! */
dcoban	0:1a61c61d0845	830	pcb->local_ip = netif->ip_addr;
dcoban	0:1a61c61d0845	831	} else if (ip_addr_isany(&pcb->remote_ip)) {
dcoban	0:1a61c61d0845	832	pcb->local_ip.addr = 0;
dcoban	0:1a61c61d0845	833	}
dcoban	0:1a61c61d0845	834	#endif
dcoban	0:1a61c61d0845	835	LWIP_DEBUGF(UDP_DEBUG \| LWIP_DBG_TRACE \| LWIP_DBG_STATE,
dcoban	0:1a61c61d0845	836	("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
dcoban	0:1a61c61d0845	837	ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
dcoban	0:1a61c61d0845	838	ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
dcoban	0:1a61c61d0845	839	pcb->local_port));
dcoban	0:1a61c61d0845	840
dcoban	0:1a61c61d0845	841	/* Insert UDP PCB into the list of active UDP PCBs. */
dcoban	0:1a61c61d0845	842	for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
dcoban	0:1a61c61d0845	843	if (pcb == ipcb) {
dcoban	0:1a61c61d0845	844	/* already on the list, just return */
dcoban	0:1a61c61d0845	845	return ERR_OK;
dcoban	0:1a61c61d0845	846	}
dcoban	0:1a61c61d0845	847	}
dcoban	0:1a61c61d0845	848	/* PCB not yet on the list, add PCB now */
dcoban	0:1a61c61d0845	849	pcb->next = udp_pcbs;
dcoban	0:1a61c61d0845	850	udp_pcbs = pcb;
dcoban	0:1a61c61d0845	851	return ERR_OK;
dcoban	0:1a61c61d0845	852	}
dcoban	0:1a61c61d0845	853
dcoban	0:1a61c61d0845	854	/**
dcoban	0:1a61c61d0845	855	* Disconnect a UDP PCB
dcoban	0:1a61c61d0845	856	*
dcoban	0:1a61c61d0845	857	* @param pcb the udp pcb to disconnect.
dcoban	0:1a61c61d0845	858	*/
dcoban	0:1a61c61d0845	859	void
dcoban	0:1a61c61d0845	860	udp_disconnect(struct udp_pcb *pcb)
dcoban	0:1a61c61d0845	861	{
dcoban	0:1a61c61d0845	862	/* reset remote address association */
dcoban	0:1a61c61d0845	863	ip_addr_set_any(&pcb->remote_ip);
dcoban	0:1a61c61d0845	864	pcb->remote_port = 0;
dcoban	0:1a61c61d0845	865	/* mark PCB as unconnected */
dcoban	0:1a61c61d0845	866	pcb->flags &= ~UDP_FLAGS_CONNECTED;
dcoban	0:1a61c61d0845	867	}
dcoban	0:1a61c61d0845	868
dcoban	0:1a61c61d0845	869	/**
dcoban	0:1a61c61d0845	870	* Set a receive callback for a UDP PCB
dcoban	0:1a61c61d0845	871	*
dcoban	0:1a61c61d0845	872	* This callback will be called when receiving a datagram for the pcb.
dcoban	0:1a61c61d0845	873	*
dcoban	0:1a61c61d0845	874	* @param pcb the pcb for wich to set the recv callback
dcoban	0:1a61c61d0845	875	* @param recv function pointer of the callback function
dcoban	0:1a61c61d0845	876	* @param recv_arg additional argument to pass to the callback function
dcoban	0:1a61c61d0845	877	*/
dcoban	0:1a61c61d0845	878	void
dcoban	0:1a61c61d0845	879	udp_recv(struct udp_pcb pcb, udp_recv_fn recv, void recv_arg)
dcoban	0:1a61c61d0845	880	{
dcoban	0:1a61c61d0845	881	/* remember recv() callback and user data */
dcoban	0:1a61c61d0845	882	pcb->recv = recv;
dcoban	0:1a61c61d0845	883	pcb->recv_arg = recv_arg;
dcoban	0:1a61c61d0845	884	}
dcoban	0:1a61c61d0845	885
dcoban	0:1a61c61d0845	886	/**
dcoban	0:1a61c61d0845	887	* Remove an UDP PCB.
dcoban	0:1a61c61d0845	888	*
dcoban	0:1a61c61d0845	889	* @param pcb UDP PCB to be removed. The PCB is removed from the list of
dcoban	0:1a61c61d0845	890	* UDP PCB's and the data structure is freed from memory.
dcoban	0:1a61c61d0845	891	*
dcoban	0:1a61c61d0845	892	* @see udp_new()
dcoban	0:1a61c61d0845	893	*/
dcoban	0:1a61c61d0845	894	void
dcoban	0:1a61c61d0845	895	udp_remove(struct udp_pcb *pcb)
dcoban	0:1a61c61d0845	896	{
dcoban	0:1a61c61d0845	897	struct udp_pcb *pcb2;
dcoban	0:1a61c61d0845	898
dcoban	0:1a61c61d0845	899	snmp_delete_udpidx_tree(pcb);
dcoban	0:1a61c61d0845	900	/* pcb to be removed is first in list? */
dcoban	0:1a61c61d0845	901	if (udp_pcbs == pcb) {
dcoban	0:1a61c61d0845	902	/* make list start at 2nd pcb */
dcoban	0:1a61c61d0845	903	udp_pcbs = udp_pcbs->next;
dcoban	0:1a61c61d0845	904	/* pcb not 1st in list */
dcoban	0:1a61c61d0845	905	} else {
dcoban	0:1a61c61d0845	906	for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
dcoban	0:1a61c61d0845	907	/* find pcb in udp_pcbs list */
dcoban	0:1a61c61d0845	908	if (pcb2->next != NULL && pcb2->next == pcb) {
dcoban	0:1a61c61d0845	909	/* remove pcb from list */
dcoban	0:1a61c61d0845	910	pcb2->next = pcb->next;
dcoban	0:1a61c61d0845	911	}
dcoban	0:1a61c61d0845	912	}
dcoban	0:1a61c61d0845	913	}
dcoban	0:1a61c61d0845	914	memp_free(MEMP_UDP_PCB, pcb);
dcoban	0:1a61c61d0845	915	}
dcoban	0:1a61c61d0845	916
dcoban	0:1a61c61d0845	917	/**
dcoban	0:1a61c61d0845	918	* Create a UDP PCB.
dcoban	0:1a61c61d0845	919	*
dcoban	0:1a61c61d0845	920	* @return The UDP PCB which was created. NULL if the PCB data structure
dcoban	0:1a61c61d0845	921	* could not be allocated.
dcoban	0:1a61c61d0845	922	*
dcoban	0:1a61c61d0845	923	* @see udp_remove()
dcoban	0:1a61c61d0845	924	*/
dcoban	0:1a61c61d0845	925	struct udp_pcb *
dcoban	0:1a61c61d0845	926	udp_new(void)
dcoban	0:1a61c61d0845	927	{
dcoban	0:1a61c61d0845	928	struct udp_pcb *pcb;
dcoban	0:1a61c61d0845	929	pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
dcoban	0:1a61c61d0845	930	/* could allocate UDP PCB? */
dcoban	0:1a61c61d0845	931	if (pcb != NULL) {
dcoban	0:1a61c61d0845	932	/* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
dcoban	0:1a61c61d0845	933	* which means checksum is generated over the whole datagram per default
dcoban	0:1a61c61d0845	934	* (recommended as default by RFC 3828). */
dcoban	0:1a61c61d0845	935	/* initialize PCB to all zeroes */
dcoban	0:1a61c61d0845	936	memset(pcb, 0, sizeof(struct udp_pcb));
dcoban	0:1a61c61d0845	937	pcb->ttl = UDP_TTL;
dcoban	0:1a61c61d0845	938	}
dcoban	0:1a61c61d0845	939	return pcb;
dcoban	0:1a61c61d0845	940	}
dcoban	0:1a61c61d0845	941
dcoban	0:1a61c61d0845	942	#if UDP_DEBUG
dcoban	0:1a61c61d0845	943	/**
dcoban	0:1a61c61d0845	944	* Print UDP header information for debug purposes.
dcoban	0:1a61c61d0845	945	*
dcoban	0:1a61c61d0845	946	* @param udphdr pointer to the udp header in memory.
dcoban	0:1a61c61d0845	947	*/
dcoban	0:1a61c61d0845	948	void
dcoban	0:1a61c61d0845	949	udp_debug_print(struct udp_hdr *udphdr)
dcoban	0:1a61c61d0845	950	{
dcoban	0:1a61c61d0845	951	LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
dcoban	0:1a61c61d0845	952	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
dcoban	0:1a61c61d0845	953	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| %5"U16_F" \| (src port, dest port)\n",
dcoban	0:1a61c61d0845	954	ntohs(udphdr->src), ntohs(udphdr->dest)));
dcoban	0:1a61c61d0845	955	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
dcoban	0:1a61c61d0845	956	LWIP_DEBUGF(UDP_DEBUG, ("\| %5"U16_F" \| 0x%04"X16_F" \| (len, chksum)\n",
dcoban	0:1a61c61d0845	957	ntohs(udphdr->len), ntohs(udphdr->chksum)));
dcoban	0:1a61c61d0845	958	LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
dcoban	0:1a61c61d0845	959	}
dcoban	0:1a61c61d0845	960	#endif /* UDP_DEBUG */
dcoban	0:1a61c61d0845	961
dcoban	0:1a61c61d0845	962	#endif /* LWIP_UDP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	03 Apr 2012
Imports:	2
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	4
Followers:	1

NetStack/lwip/core/udp.c@0:1a61c61d0845, 2012-04-03 (annotated)

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