ReactOS 0.4.15-dev-8241-g63935f8
udp.c
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1
7/*
8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without modification,
12 * are permitted provided that the following conditions are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright notice,
15 * this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright notice,
17 * this list of conditions and the following disclaimer in the documentation
18 * and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
31 * OF SUCH DAMAGE.
32 *
33 * This file is part of the lwIP TCP/IP stack.
34 *
35 * Author: Adam Dunkels <adam@sics.se>
36 *
37 */
38
39
40/* udp.c
41 *
42 * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
43 *
44 */
45
46/* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
47 */
48
49#include "lwip/opt.h"
50
51#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
52
53#include "lwip/udp.h"
54#include "lwip/def.h"
55#include "lwip/memp.h"
56#include "lwip/inet_chksum.h"
57#include "lwip/ip_addr.h"
58#include "lwip/netif.h"
59#include "lwip/icmp.h"
60#include "lwip/stats.h"
61#include "lwip/snmp.h"
62#include "arch/perf.h"
63#include "lwip/dhcp.h"
64
65#include <string.h>
66
67#ifndef UDP_LOCAL_PORT_RANGE_START
68/* From http://www.iana.org/assignments/port-numbers:
69 "The Dynamic and/or Private Ports are those from 49152 through 65535" */
70#define UDP_LOCAL_PORT_RANGE_START 0xc000
71#define UDP_LOCAL_PORT_RANGE_END 0xffff
72#define UDP_ENSURE_LOCAL_PORT_RANGE(port) (((port) & ~UDP_LOCAL_PORT_RANGE_START) + UDP_LOCAL_PORT_RANGE_START)
73#endif
74
75/* last local UDP port */
76static u16_t udp_port = UDP_LOCAL_PORT_RANGE_START;
77
78/* The list of UDP PCBs */
79/* exported in udp.h (was static) */
80struct udp_pcb *udp_pcbs;
81
85void
86udp_init(void)
87{
88#if LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS && defined(LWIP_RAND)
89 udp_port = UDP_ENSURE_LOCAL_PORT_RANGE(LWIP_RAND());
90#endif /* LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS && defined(LWIP_RAND) */
91}
92
98static u16_t
99udp_new_port(void)
100{
101 u16_t n = 0;
102 struct udp_pcb *pcb;
103
104again:
105 if (udp_port++ == UDP_LOCAL_PORT_RANGE_END) {
106 udp_port = UDP_LOCAL_PORT_RANGE_START;
107 }
108 /* Check all PCBs. */
109 for(pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
110 if (pcb->local_port == udp_port) {
111 if (++n > (UDP_LOCAL_PORT_RANGE_END - UDP_LOCAL_PORT_RANGE_START)) {
112 return 0;
113 }
114 goto again;
115 }
116 }
117 return udp_port;
118#if 0
119 struct udp_pcb *ipcb = udp_pcbs;
120 while ((ipcb != NULL) && (udp_port != UDP_LOCAL_PORT_RANGE_END)) {
121 if (ipcb->local_port == udp_port) {
122 /* port is already used by another udp_pcb */
123 udp_port++;
124 /* restart scanning all udp pcbs */
125 ipcb = udp_pcbs;
126 } else {
127 /* go on with next udp pcb */
128 ipcb = ipcb->next;
129 }
130 }
131 if (ipcb != NULL) {
132 return 0;
133 }
134 return udp_port;
135#endif
136}
137
150void
151udp_input(struct pbuf *p, struct netif *inp)
152{
153 struct udp_hdr *udphdr;
154 struct udp_pcb *pcb, *prev;
155 struct udp_pcb *uncon_pcb;
156 struct ip_hdr *iphdr;
157 u16_t src, dest;
158 u8_t local_match;
159 u8_t broadcast;
160
162
163 UDP_STATS_INC(udp.recv);
164
165 iphdr = (struct ip_hdr *)p->payload;
166
167 /* Check minimum length (IP header + UDP header)
168 * and move payload pointer to UDP header */
169 if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
170 /* drop short packets */
172 ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
173 UDP_STATS_INC(udp.lenerr);
174 UDP_STATS_INC(udp.drop);
176 pbuf_free(p);
177 goto end;
178 }
179
180 udphdr = (struct udp_hdr *)p->payload;
181
182 /* is broadcast packet ? */
183 broadcast = ip_addr_isbroadcast(&current_iphdr_dest, inp);
184
185 LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
186
187 /* convert src and dest ports to host byte order */
188 src = ntohs(udphdr->src);
189 dest = ntohs(udphdr->dest);
190
191 udp_debug_print(udphdr);
192
193 /* print the UDP source and destination */
195 ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
196 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
197 ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
198 ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
199 ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
200 ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
201
202#if LWIP_DHCP
203 pcb = NULL;
204 /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
205 the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
206 if (dest == DHCP_CLIENT_PORT) {
207 /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
208 if (src == DHCP_SERVER_PORT) {
209 if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
210 /* accept the packe if
211 (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
212 - inp->dhcp->pcb->remote == ANY or iphdr->src */
213 if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
214 ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), &current_iphdr_src))) {
215 pcb = inp->dhcp->pcb;
216 }
217 }
218 }
219 } else
220#endif /* LWIP_DHCP */
221 {
222 prev = NULL;
223 local_match = 0;
224 uncon_pcb = NULL;
225 /* Iterate through the UDP pcb list for a matching pcb.
226 * 'Perfect match' pcbs (connected to the remote port & ip address) are
227 * preferred. If no perfect match is found, the first unconnected pcb that
228 * matches the local port and ip address gets the datagram. */
229 for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
230 local_match = 0;
231 /* print the PCB local and remote address */
233 ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
234 "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
235 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
236 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
237 ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
238 ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
239
240 /* compare PCB local addr+port to UDP destination addr+port */
241 if (pcb->local_port == dest) {
242 if (
243 (!broadcast && ip_addr_isany(&pcb->local_ip)) ||
244 ip_addr_cmp(&(pcb->local_ip), &current_iphdr_dest) ||
245#if LWIP_IGMP
247#endif /* LWIP_IGMP */
249 (broadcast && ip_get_option(pcb, SOF_BROADCAST) &&
250 (ip_addr_isany(&pcb->local_ip) ||
251 ip_addr_netcmp(&pcb->local_ip, ip_current_dest_addr(), &inp->netmask)))) {
252#else /* IP_SOF_BROADCAST_RECV */
253 (broadcast &&
254 (ip_addr_isany(&pcb->local_ip) ||
255 ip_addr_netcmp(&pcb->local_ip, ip_current_dest_addr(), &inp->netmask)))) {
256#endif /* IP_SOF_BROADCAST_RECV */
257 local_match = 1;
258 if ((uncon_pcb == NULL) &&
259 ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
260 /* the first unconnected matching PCB */
261 uncon_pcb = pcb;
262 }
263 }
264 }
265 /* compare PCB remote addr+port to UDP source addr+port */
266 if ((local_match != 0) &&
267 (pcb->remote_port == src) &&
268 (ip_addr_isany(&pcb->remote_ip) ||
269 ip_addr_cmp(&(pcb->remote_ip), &current_iphdr_src))) {
270 /* the first fully matching PCB */
271 if (prev != NULL) {
272 /* move the pcb to the front of udp_pcbs so that is
273 found faster next time */
274 prev->next = pcb->next;
275 pcb->next = udp_pcbs;
276 udp_pcbs = pcb;
277 } else {
278 UDP_STATS_INC(udp.cachehit);
279 }
280 break;
281 }
282 prev = pcb;
283 }
284 /* no fully matching pcb found? then look for an unconnected pcb */
285 if (pcb == NULL) {
286 pcb = uncon_pcb;
287 }
288 }
289
290 /* Check checksum if this is a match or if it was directed at us. */
291 if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, &current_iphdr_dest)) {
292 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
293#if LWIP_UDPLITE
294 if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
295 /* Do the UDP Lite checksum */
296#if CHECKSUM_CHECK_UDP
297 u16_t chklen = ntohs(udphdr->len);
298 if (chklen < sizeof(struct udp_hdr)) {
299 if (chklen == 0) {
300 /* For UDP-Lite, checksum length of 0 means checksum
301 over the complete packet (See RFC 3828 chap. 3.1) */
302 chklen = p->tot_len;
303 } else {
304 /* At least the UDP-Lite header must be covered by the
305 checksum! (Again, see RFC 3828 chap. 3.1) */
306 UDP_STATS_INC(udp.chkerr);
307 UDP_STATS_INC(udp.drop);
309 pbuf_free(p);
310 goto end;
311 }
312 }
314 IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
316 ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
317 UDP_STATS_INC(udp.chkerr);
318 UDP_STATS_INC(udp.drop);
320 pbuf_free(p);
321 goto end;
322 }
323#endif /* CHECKSUM_CHECK_UDP */
324 } else
325#endif /* LWIP_UDPLITE */
326 {
327#if CHECKSUM_CHECK_UDP
328 if (udphdr->chksum != 0) {
330 IP_PROTO_UDP, p->tot_len) != 0) {
332 ("udp_input: UDP datagram discarded due to failing checksum\n"));
333 UDP_STATS_INC(udp.chkerr);
334 UDP_STATS_INC(udp.drop);
336 pbuf_free(p);
337 goto end;
338 }
339 }
340#endif /* CHECKSUM_CHECK_UDP */
341 }
342 if(pbuf_header(p, -UDP_HLEN)) {
343 /* Can we cope with this failing? Just assert for now */
344 LWIP_ASSERT("pbuf_header failed\n", 0);
345 UDP_STATS_INC(udp.drop);
347 pbuf_free(p);
348 goto end;
349 }
350 if (pcb != NULL) {
352#if SO_REUSE && SO_REUSE_RXTOALL
353 if ((broadcast || ip_addr_ismulticast(&current_iphdr_dest)) &&
355 /* pass broadcast- or multicast packets to all multicast pcbs
356 if SOF_REUSEADDR is set on the first match */
357 struct udp_pcb *mpcb;
358 u8_t p_header_changed = 0;
359 for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
360 if (mpcb != pcb) {
361 /* compare PCB local addr+port to UDP destination addr+port */
362 if ((mpcb->local_port == dest) &&
363 ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
364 ip_addr_cmp(&(mpcb->local_ip), &current_iphdr_dest) ||
365#if LWIP_IGMP
367#endif /* LWIP_IGMP */
369 (broadcast && ip_get_option(mpcb, SOF_BROADCAST)))) {
370#else /* IP_SOF_BROADCAST_RECV */
371 (broadcast))) {
372#endif /* IP_SOF_BROADCAST_RECV */
373 /* pass a copy of the packet to all local matches */
374 if (mpcb->recv != NULL) {
375 struct pbuf *q;
376 /* for that, move payload to IP header again */
377 if (p_header_changed == 0) {
378 pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
379 p_header_changed = 1;
380 }
381 q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
382 if (q != NULL) {
383 err_t err = pbuf_copy(q, p);
384 if (err == ERR_OK) {
385 /* move payload to UDP data */
386 pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
387 mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
388 }
389 }
390 }
391 }
392 }
393 }
394 if (p_header_changed) {
395 /* and move payload to UDP data again */
396 pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
397 }
398 }
399#endif /* SO_REUSE && SO_REUSE_RXTOALL */
400 /* callback */
401 if (pcb->recv != NULL) {
402 /* now the recv function is responsible for freeing p */
403 pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
404 } else {
405 /* no recv function registered? then we have to free the pbuf! */
406 pbuf_free(p);
407 goto end;
408 }
409 } else {
410 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
411
412#if LWIP_ICMP
413 /* No match was found, send ICMP destination port unreachable unless
414 destination address was broadcast/multicast. */
415 if (!broadcast &&
417 /* move payload pointer back to ip header */
418 pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
419 LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
420 icmp_dest_unreach(p, ICMP_DUR_PORT);
421 }
422#endif /* LWIP_ICMP */
423 UDP_STATS_INC(udp.proterr);
424 UDP_STATS_INC(udp.drop);
426 pbuf_free(p);
427 }
428 } else {
429 pbuf_free(p);
430 }
431end:
432 PERF_STOP("udp_input");
433}
434
453err_t
454udp_send(struct udp_pcb *pcb, struct pbuf *p)
455{
456 /* send to the packet using remote ip and port stored in the pcb */
457 return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
458}
459
460#if LWIP_CHECKSUM_ON_COPY
463err_t
464udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
465 u8_t have_chksum, u16_t chksum)
466{
467 /* send to the packet using remote ip and port stored in the pcb */
468 return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
469 have_chksum, chksum);
470}
471#endif /* LWIP_CHECKSUM_ON_COPY */
472
490err_t
491udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
492 ip_addr_t *dst_ip, u16_t dst_port)
493{
494#if LWIP_CHECKSUM_ON_COPY
495 return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
496}
497
499err_t
500udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
501 u16_t dst_port, u8_t have_chksum, u16_t chksum)
502{
503#endif /* LWIP_CHECKSUM_ON_COPY */
504 struct netif *netif;
505
506 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
507
508 /* find the outgoing network interface for this packet */
509#if LWIP_IGMP
510 netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
511#else
512 netif = ip_route(dst_ip);
513#endif /* LWIP_IGMP */
514
515 /* no outgoing network interface could be found? */
516 if (netif == NULL) {
517 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
518 ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
519 UDP_STATS_INC(udp.rterr);
520 return ERR_RTE;
521 }
522#if LWIP_CHECKSUM_ON_COPY
523 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
524#else /* LWIP_CHECKSUM_ON_COPY */
525 return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
526#endif /* LWIP_CHECKSUM_ON_COPY */
527}
528
548err_t
549udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
550 ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
551{
552#if LWIP_CHECKSUM_ON_COPY
553 return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
554}
555
557err_t
558udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
559 u16_t dst_port, struct netif *netif, u8_t have_chksum,
561{
562#endif /* LWIP_CHECKSUM_ON_COPY */
563 struct udp_hdr *udphdr;
564 ip_addr_t *src_ip;
565 err_t err;
566 struct pbuf *q; /* q will be sent down the stack */
567
568#if IP_SOF_BROADCAST
569 /* broadcast filter? */
570 if (!ip_get_option(pcb, SOF_BROADCAST) && ip_addr_isbroadcast(dst_ip, netif)) {
572 ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
573 return ERR_VAL;
574 }
575#endif /* IP_SOF_BROADCAST */
576
577 /* if the PCB is not yet bound to a port, bind it here */
578 if (pcb->local_port == 0) {
579 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
580 err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
581 if (err != ERR_OK) {
582 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
583 return err;
584 }
585 }
586
587 /* not enough space to add an UDP header to first pbuf in given p chain? */
588 if (pbuf_header(p, UDP_HLEN)) {
589 /* allocate header in a separate new pbuf */
590 q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
591 /* new header pbuf could not be allocated? */
592 if (q == NULL) {
593 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
594 return ERR_MEM;
595 }
596 if (p->tot_len != 0) {
597 /* chain header q in front of given pbuf p (only if p contains data) */
598 pbuf_chain(q, p);
599 }
600 /* first pbuf q points to header pbuf */
602 ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
603 } else {
604 /* adding space for header within p succeeded */
605 /* first pbuf q equals given pbuf */
606 q = p;
607 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
608 }
609 LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
610 (q->len >= sizeof(struct udp_hdr)));
611 /* q now represents the packet to be sent */
612 udphdr = (struct udp_hdr *)q->payload;
613 udphdr->src = htons(pcb->local_port);
614 udphdr->dest = htons(dst_port);
615 /* in UDP, 0 checksum means 'no checksum' */
616 udphdr->chksum = 0x0000;
617
618 /* Multicast Loop? */
619#if LWIP_IGMP
620 if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
621 q->flags |= PBUF_FLAG_MCASTLOOP;
622 }
623#endif /* LWIP_IGMP */
624
625
626 /* PCB local address is IP_ANY_ADDR? */
627 if (ip_addr_isany(&pcb->local_ip)) {
628 /* use outgoing network interface IP address as source address */
629 src_ip = &(netif->ip_addr);
630 } else {
631 /* check if UDP PCB local IP address is correct
632 * this could be an old address if netif->ip_addr has changed */
633 if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
634 /* local_ip doesn't match, drop the packet */
635 if (q != p) {
636 /* free the header pbuf */
637 pbuf_free(q);
638 q = NULL;
639 /* p is still referenced by the caller, and will live on */
640 }
641 return ERR_VAL;
642 }
643 /* use UDP PCB local IP address as source address */
644 src_ip = &(pcb->local_ip);
645 }
646
647 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
648
649#if LWIP_UDPLITE
650 /* UDP Lite protocol? */
651 if (pcb->flags & UDP_FLAGS_UDPLITE) {
652 u16_t chklen, chklen_hdr;
653 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
654 /* set UDP message length in UDP header */
655 chklen_hdr = chklen = pcb->chksum_len_tx;
656 if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
657 if (chklen != 0) {
658 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
659 }
660 /* For UDP-Lite, checksum length of 0 means checksum
661 over the complete packet. (See RFC 3828 chap. 3.1)
662 At least the UDP-Lite header must be covered by the
663 checksum, therefore, if chksum_len has an illegal
664 value, we generate the checksum over the complete
665 packet to be safe. */
666 chklen_hdr = 0;
667 chklen = q->tot_len;
668 }
669 udphdr->len = htons(chklen_hdr);
670 /* calculate checksum */
671#if CHECKSUM_GEN_UDP
672 udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
673 IP_PROTO_UDPLITE, q->tot_len,
675 chklen);
676#else /* !LWIP_CHECKSUM_ON_COPY */
677 (have_chksum ? UDP_HLEN : chklen));
678 if (have_chksum) {
679 u32_t acc;
680 acc = udphdr->chksum + (u16_t)~(chksum);
681 udphdr->chksum = FOLD_U32T(acc);
682 }
683#endif /* !LWIP_CHECKSUM_ON_COPY */
684
685 /* chksum zero must become 0xffff, as zero means 'no checksum' */
686 if (udphdr->chksum == 0x0000) {
687 udphdr->chksum = 0xffff;
688 }
689#endif /* CHECKSUM_GEN_UDP */
690 /* output to IP */
691 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
692 NETIF_SET_HWADDRHINT(netif, &pcb->addr_hint);
693 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
695 } else
696#endif /* LWIP_UDPLITE */
697 { /* UDP */
698 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
699 udphdr->len = htons(q->tot_len);
700 /* calculate checksum */
701#if CHECKSUM_GEN_UDP
702 if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
703 u16_t udpchksum;
704#if LWIP_CHECKSUM_ON_COPY
705 if (have_chksum) {
706 u32_t acc;
707 udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
708 q->tot_len, UDP_HLEN);
709 acc = udpchksum + (u16_t)~(chksum);
710 udpchksum = FOLD_U32T(acc);
711 } else
712#endif /* LWIP_CHECKSUM_ON_COPY */
713 {
714 udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
715 }
716
717 /* chksum zero must become 0xffff, as zero means 'no checksum' */
718 if (udpchksum == 0x0000) {
719 udpchksum = 0xffff;
720 }
721 udphdr->chksum = udpchksum;
722 }
723#endif /* CHECKSUM_GEN_UDP */
724 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
725 LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
726 /* output to IP */
727 NETIF_SET_HWADDRHINT(netif, &pcb->addr_hint);
728 err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
730 }
731 /* TODO: must this be increased even if error occured? */
733
734 /* did we chain a separate header pbuf earlier? */
735 if (q != p) {
736 /* free the header pbuf */
737 pbuf_free(q);
738 q = NULL;
739 /* p is still referenced by the caller, and will live on */
740 }
741
742 UDP_STATS_INC(udp.xmit);
743 return err;
744}
745
765err_t
766udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
767{
768 struct udp_pcb *ipcb;
769 u8_t rebind;
770
771 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
773 LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
774
775 rebind = 0;
776 /* Check for double bind and rebind of the same pcb */
777 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
778 /* is this UDP PCB already on active list? */
779 if (pcb == ipcb) {
780 /* pcb may occur at most once in active list */
781 LWIP_ASSERT("rebind == 0", rebind == 0);
782 /* pcb already in list, just rebind */
783 rebind = 1;
784 }
785
786 /* By default, we don't allow to bind to a port that any other udp
787 PCB is alread bound to, unless *all* PCBs with that port have tha
788 REUSEADDR flag set. */
789#if SO_REUSE
790 else if (!ip_get_option(pcb, SOF_REUSEADDR) &&
792#else /* SO_REUSE */
793 /* port matches that of PCB in list and REUSEADDR not set -> reject */
794 else {
795#endif /* SO_REUSE */
796 if ((ipcb->local_port == port) &&
797 /* IP address matches, or one is IP_ADDR_ANY? */
798 (ip_addr_isany(&(ipcb->local_ip)) ||
799 ip_addr_isany(ipaddr) ||
800 ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
801 /* other PCB already binds to this local IP and port */
803 ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
804 return ERR_USE;
805 }
806 }
807 }
808
809 ip_addr_set(&pcb->local_ip, ipaddr);
810
811 /* no port specified? */
812 if (port == 0) {
813 port = udp_new_port();
814 if (port == 0) {
815 /* no more ports available in local range */
816 LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
817 return ERR_USE;
818 }
819 }
820 pcb->local_port = port;
822 /* pcb not active yet? */
823 if (rebind == 0) {
824 /* place the PCB on the active list if not already there */
825 pcb->next = udp_pcbs;
826 udp_pcbs = pcb;
827 }
829 ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
830 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
831 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
832 pcb->local_port));
833 return ERR_OK;
834}
852err_t
853udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
854{
855 struct udp_pcb *ipcb;
856
857 if (pcb->local_port == 0) {
858 err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
859 if (err != ERR_OK) {
860 return err;
861 }
862 }
863
864 ip_addr_set(&pcb->remote_ip, ipaddr);
865 pcb->remote_port = port;
866 pcb->flags |= UDP_FLAGS_CONNECTED;
868#ifdef LWIP_UDP_TODO
869 /* Nail down local IP for netconn_addr()/getsockname() */
870 if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
871 struct netif *netif;
872
873 if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
874 LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
875 UDP_STATS_INC(udp.rterr);
876 return ERR_RTE;
877 }
881 pcb->local_ip = netif->ip_addr;
882 } else if (ip_addr_isany(&pcb->remote_ip)) {
883 pcb->local_ip.addr = 0;
884 }
885#endif
887 ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
888 ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
889 ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
890 pcb->local_port));
891
892 /* Insert UDP PCB into the list of active UDP PCBs. */
893 for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
894 if (pcb == ipcb) {
895 /* already on the list, just return */
896 return ERR_OK;
897 }
898 }
899 /* PCB not yet on the list, add PCB now */
900 pcb->next = udp_pcbs;
901 udp_pcbs = pcb;
902 return ERR_OK;
903}
904
910void
911udp_disconnect(struct udp_pcb *pcb)
912{
913 /* reset remote address association */
914 ip_addr_set_any(&pcb->remote_ip);
915 pcb->remote_port = 0;
916 /* mark PCB as unconnected */
917 pcb->flags &= ~UDP_FLAGS_CONNECTED;
918}
919
929void
930udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
931{
932 /* remember recv() callback and user data */
933 pcb->recv = recv;
934 pcb->recv_arg = recv_arg;
935}
936
945void
946udp_remove(struct udp_pcb *pcb)
947{
948 struct udp_pcb *pcb2;
949
951 /* pcb to be removed is first in list? */
952 if (udp_pcbs == pcb) {
953 /* make list start at 2nd pcb */
954 udp_pcbs = udp_pcbs->next;
955 /* pcb not 1st in list */
956 } else {
957 for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
958 /* find pcb in udp_pcbs list */
959 if (pcb2->next != NULL && pcb2->next == pcb) {
960 /* remove pcb from list */
961 pcb2->next = pcb->next;
962 }
963 }
964 }
965 memp_free(MEMP_UDP_PCB, pcb);
966}
967
976struct udp_pcb *
977udp_new(void)
978{
979 struct udp_pcb *pcb;
980 pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
981 /* could allocate UDP PCB? */
982 if (pcb != NULL) {
983 /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
984 * which means checksum is generated over the whole datagram per default
985 * (recommended as default by RFC 3828). */
986 /* initialize PCB to all zeroes */
987 memset(pcb, 0, sizeof(struct udp_pcb));
988 pcb->ttl = UDP_TTL;
989 }
990 return pcb;
991}
992
993#if UDP_DEBUG
999void
1000udp_debug_print(struct udp_hdr *udphdr)
1001{
1002 LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
1003 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
1004 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
1005 ntohs(udphdr->src), ntohs(udphdr->dest)));
1006 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
1007 LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
1008 ntohs(udphdr->len), ntohs(udphdr->chksum)));
1009 LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
1010}
1011#endif /* UDP_DEBUG */
1012
1013#endif /* LWIP_UDP */
#define NULL
Definition: types.h:112
USHORT port
Definition: uri.c:228
INT WSAAPI recv(IN SOCKET s, OUT CHAR FAR *buf, IN INT len, IN INT flags)
Definition: recv.c:23
#define X16_F
Definition: cc.h:38
signed short s16_t
Definition: cc.h:29
#define U16_F
Definition: cc.h:36
unsigned long u32_t
Definition: cc.h:25
unsigned char u8_t
Definition: cc.h:23
unsigned short u16_t
Definition: cc.h:24
#define ip_get_option(pcb, opt)
Definition: ip.h:205
#define IP_PROTO_UDPLITE
Definition: ip.h:55
#define ip_current_src_addr()
Definition: ip.h:200
#define IP_PROTO_UDP
Definition: ip.h:54
#define IPH_HL(hdr)
Definition: ip.h:147
#define ip_current_dest_addr()
Definition: ip.h:202
#define IPH_PROTO(hdr)
Definition: ip.h:153
#define SOF_REUSEADDR
Definition: ip.h:99
#define SOF_BROADCAST
Definition: ip.h:102
#define LWIP_DBG_LEVEL_SERIOUS
Definition: debug.h:47
#define LWIP_DBG_STATE
Definition: debug.h:59
#define LWIP_DEBUGF(debug, message)
Definition: debug.h:95
#define LWIP_ASSERT(message, assertion)
Definition: debug.h:66
#define LWIP_DBG_TRACE
Definition: debug.h:57
#define ERR_MEM
Definition: err.h:53
#define ERR_USE
Definition: err.h:60
#define ERR_OK
Definition: err.h:52
#define ERR_RTE
Definition: err.h:56
#define ERR_VAL
Definition: err.h:58
s8_t err_t
Definition: err.h:47
#define snmp_insert_udpidx_tree(pcb)
Definition: snmp.h:326
#define snmp_inc_udpnoports()
Definition: snmp.h:323
#define snmp_inc_udpindatagrams()
Definition: snmp.h:322
#define snmp_delete_udpidx_tree(pcb)
Definition: snmp.h:327
#define snmp_inc_udpinerrors()
Definition: snmp.h:324
#define snmp_inc_udpoutdatagrams()
Definition: snmp.h:325
GLuint GLuint end
Definition: gl.h:1545
GLdouble GLdouble GLdouble GLdouble q
Definition: gl.h:2063
GLdouble n
Definition: glext.h:7729
GLenum src
Definition: glext.h:6340
GLfloat GLfloat p
Definition: glext.h:8902
#define IP_SOF_BROADCAST_RECV
Definition: lwipopts.h:31
#define LWIP_IGMP
Definition: lwipopts.h:43
static u32_t chksum(void *dataptr, u16_t len)
Definition: inet6.c:55
u16_t inet_chksum_pseudo(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, u8_t proto, u16_t proto_len)
Definition: inet_chksum.c:272
u16_t inet_chksum_pseudo_partial(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, u8_t proto, u16_t proto_len, u16_t chksum_len)
Definition: inet_chksum.c:332
#define FOLD_U32T(u)
Definition: inet_chksum.h:53
#define ip_addr_cmp(addr1, addr2)
Definition: ip_addr.h:198
#define ip_addr_isany(addr1)
Definition: ip_addr.h:200
#define ip4_addr1_16(ipaddr)
Definition: ip_addr.h:226
#define ip_addr_ismulticast(addr1)
Definition: ip_addr.h:208
#define ip_addr_netcmp(addr1, addr2, mask)
Definition: ip_addr.h:194
#define ip4_addr2_16(ipaddr)
Definition: ip_addr.h:227
#define ip_addr_set(dest, src)
Definition: ip_addr.h:164
typedefPACK_STRUCT_END struct ip_addr ip_addr_t
Definition: ip_addr.h:64
#define ip_addr_isbroadcast(ipaddr, netif)
Definition: ip_addr.h:202
#define ip_addr_set_any(ipaddr)
Definition: ip_addr.h:170
#define ip4_addr3_16(ipaddr)
Definition: ip_addr.h:228
#define ip4_addr4_16(ipaddr)
Definition: ip_addr.h:229
#define ip_addr_debug_print(debug, ipaddr)
Definition: ip_addr.h:212
if(dx< 0)
Definition: linetemp.h:194
ip_addr_t current_iphdr_src
Definition: ip.c:107
err_t ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, u8_t ttl, u8_t tos, u8_t proto, struct netif *netif)
Definition: ip.c:641
ip_addr_t current_iphdr_dest
Definition: ip.c:109
struct netif * ip_route(ip_addr_t *dest)
Definition: ip.c:124
@ ICMP_DUR_PORT
Definition: icmp.h:60
void * memp_malloc(memp_t type)
Definition: memp.c:390
void memp_free(memp_t type, void *mem)
Definition: memp.c:435
#define htons(x)
Definition: module.h:215
#define ntohs(x)
Definition: module.h:210
static char * dest
Definition: rtl.c:135
#define NETIF_SET_HWADDRHINT(netif, hint)
Definition: netif.h:321
#define UDP_DEBUG
Definition: opt.h:2074
#define UDP_TTL
Definition: opt.h:889
#define LWIP_CHECKSUM_ON_COPY
Definition: opt.h:1841
u8_t pbuf_header(struct pbuf *p, s16_t header_size_increment)
Definition: pbuf.c:511
void pbuf_chain(struct pbuf *h, struct pbuf *t)
Definition: pbuf.c:786
struct pbuf * pbuf_alloc(pbuf_layer layer, u16_t length, pbuf_type type)
Definition: pbuf.c:207
u8_t pbuf_free(struct pbuf *p)
Definition: pbuf.c:618
err_t pbuf_copy(struct pbuf *p_to, struct pbuf *p_from)
Definition: pbuf.c:852
@ PBUF_RAM
Definition: pbuf.h:58
#define PBUF_FLAG_MCASTLOOP
Definition: pbuf.h:71
@ PBUF_RAW
Definition: pbuf.h:54
@ PBUF_IP
Definition: pbuf.h:52
#define PERF_START
Definition: perf.h:3
#define PERF_STOP
Definition: perf.h:4
#define err(...)
#define memset(x, y, z)
Definition: compat.h:39
#define UDP_STATS_INC(x)
Definition: stats.h:179
struct define * next
Definition: compiler.c:65
Definition: ip.h:116
struct ip_addr src dest
Definition: ip.h:96
Definition: netif.h:136
ip_addr_t netmask
Definition: netif.h:142
ip_addr_t ip_addr
Definition: netif.h:141
Definition: pbuf.h:79
Definition: dhcpd.h:79