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2 * Copyright (c) 1982, 1986, 1988, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
34 * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
38 * Changes and additions relating to SLiRP
39 * Copyright (c) 1995 Danny Gasparovski.
41 * Please read the file COPYRIGHT for the
42 * terms and conditions of the copyright.
49 struct udpstat udpstat
;
54 static u_int8_t
udp_tos(struct socket
*so
);
55 static void udp_emu(struct socket
*so
, struct mbuf
*m
);
58 * UDP protocol implementation.
59 * Per RFC 768, August, 1980.
64 #define UDPCKSUM 0 /* XXX */
67 struct socket
*udp_last_so
= &udb
;
72 udb
.so_next
= udb
.so_prev
= &udb
;
74 /* m->m_data points at ip packet header
75 * m->m_len length ip packet
76 * ip->ip_len length data (IPDU)
80 register struct mbuf
*m
;
83 register struct ip
*ip
;
84 register struct udphdr
*uh
;
85 /* struct mbuf *opts = 0;*/
90 DEBUG_CALL("udp_input");
91 DEBUG_ARG("m = %lx", (long)m
);
92 DEBUG_ARG("iphlen = %d", iphlen
);
94 STAT(udpstat
.udps_ipackets
++);
97 * Strip IP options, if any; should skip this,
98 * make available to user, and use on returned packets,
99 * but we don't yet have a way to check the checksum
100 * with options still present.
102 if(iphlen
> sizeof(struct ip
)) {
103 ip_stripoptions(m
, (struct mbuf
*)0);
104 iphlen
= sizeof(struct ip
);
108 * Get IP and UDP header together in first mbuf.
110 ip
= mtod(m
, struct ip
*);
111 uh
= (struct udphdr
*)((caddr_t
)ip
+ iphlen
);
114 * Make mbuf data length reflect UDP length.
115 * If not enough data to reflect UDP length, drop.
117 len
= ntohs((u_int16_t
)uh
->uh_ulen
);
119 if (ip
->ip_len
!= len
) {
120 if (len
> ip
->ip_len
) {
121 STAT(udpstat
.udps_badlen
++);
124 m_adj(m
, len
- ip
->ip_len
);
129 * Save a copy of the IP header in case we want restore it
130 * for sending an ICMP error message in response.
133 save_ip
.ip_len
+= iphlen
; /* tcp_input subtracts this */
136 * Checksum extended UDP header and data.
138 if (UDPCKSUM
&& uh
->uh_sum
) {
139 ((struct ipovly
*)ip
)->ih_next
= 0;
140 ((struct ipovly
*)ip
)->ih_prev
= 0;
141 ((struct ipovly
*)ip
)->ih_x1
= 0;
142 ((struct ipovly
*)ip
)->ih_len
= uh
->uh_ulen
;
143 /* keep uh_sum for ICMP reply
144 * uh->uh_sum = cksum(m, len + sizeof (struct ip));
147 if(cksum(m
, len
+ sizeof(struct ip
))) {
148 STAT(udpstat
.udps_badsum
++);
156 if (ntohs(uh
->uh_dport
) == BOOTP_SERVER
) {
167 if (ntohs(uh
->uh_dport
) == TFTP_SERVER
) {
173 * Locate pcb for datagram.
176 if (so
->so_lport
!= uh
->uh_sport
||
177 so
->so_laddr
.s_addr
!= ip
->ip_src
.s_addr
) {
180 for (tmp
= udb
.so_next
; tmp
!= &udb
; tmp
= tmp
->so_next
) {
181 if (tmp
->so_lport
== uh
->uh_sport
&&
182 tmp
->so_laddr
.s_addr
== ip
->ip_src
.s_addr
) {
183 tmp
->so_faddr
.s_addr
= ip
->ip_dst
.s_addr
;
184 tmp
->so_fport
= uh
->uh_dport
;
192 STAT(udpstat
.udpps_pcbcachemiss
++);
199 * If there's no socket for this packet,
202 if ((so
= socreate()) == NULL
) goto bad
;
203 if(udp_attach(so
) == -1) {
204 DEBUG_MISC((dfd
," udp_attach errno = %d-%s\n",
205 errno
,strerror(errno
)));
213 /* udp_last_so = so; */
214 so
->so_laddr
= ip
->ip_src
;
215 so
->so_lport
= uh
->uh_sport
;
217 if ((so
->so_iptos
= udp_tos(so
)) == 0)
218 so
->so_iptos
= ip
->ip_tos
;
221 * XXXXX Here, check if it's in udpexec_list,
222 * and if it is, do the fork_exec() etc.
226 so
->so_faddr
= ip
->ip_dst
; /* XXX */
227 so
->so_fport
= uh
->uh_dport
; /* XXX */
229 iphlen
+= sizeof(struct udphdr
);
234 * Now we sendto() the packet.
239 if(sosendto(so
,m
) == -1) {
243 DEBUG_MISC((dfd
,"udp tx errno = %d-%s\n",errno
,strerror(errno
)));
244 icmp_error(m
, ICMP_UNREACH
,ICMP_UNREACH_NET
, 0,strerror(errno
));
247 m_free(so
->so_m
); /* used for ICMP if error on sorecvfrom */
249 /* restore the orig mbuf packet */
253 so
->so_m
=m
; /* ICMP backup */
258 /* if (opts) m_freem(opts); */
262 int udp_output2(struct socket
*so
, struct mbuf
*m
,
263 struct sockaddr_in
*saddr
, struct sockaddr_in
*daddr
,
266 register struct udpiphdr
*ui
;
269 DEBUG_CALL("udp_output");
270 DEBUG_ARG("so = %lx", (long)so
);
271 DEBUG_ARG("m = %lx", (long)m
);
272 DEBUG_ARG("saddr = %lx", (long)saddr
->sin_addr
.s_addr
);
273 DEBUG_ARG("daddr = %lx", (long)daddr
->sin_addr
.s_addr
);
278 m
->m_data
-= sizeof(struct udpiphdr
);
279 m
->m_len
+= sizeof(struct udpiphdr
);
282 * Fill in mbuf with extended UDP header
283 * and addresses and length put into network format.
285 ui
= mtod(m
, struct udpiphdr
*);
286 ui
->ui_next
= ui
->ui_prev
= 0;
288 ui
->ui_pr
= IPPROTO_UDP
;
289 ui
->ui_len
= htons(m
->m_len
- sizeof(struct ip
)); /* + sizeof (struct udphdr)); */
290 /* XXXXX Check for from-one-location sockets, or from-any-location sockets */
291 ui
->ui_src
= saddr
->sin_addr
;
292 ui
->ui_dst
= daddr
->sin_addr
;
293 ui
->ui_sport
= saddr
->sin_port
;
294 ui
->ui_dport
= daddr
->sin_port
;
295 ui
->ui_ulen
= ui
->ui_len
;
298 * Stuff checksum and output datagram.
302 if ((ui
->ui_sum
= cksum(m
, /* sizeof (struct udpiphdr) + */ m
->m_len
)) == 0)
305 ((struct ip
*)ui
)->ip_len
= m
->m_len
;
307 ((struct ip
*)ui
)->ip_ttl
= IPDEFTTL
;
308 ((struct ip
*)ui
)->ip_tos
= iptos
;
310 STAT(udpstat
.udps_opackets
++);
312 error
= ip_output(so
, m
);
317 int udp_output(struct socket
*so
, struct mbuf
*m
,
318 struct sockaddr_in
*addr
)
321 struct sockaddr_in saddr
, daddr
;
324 if ((so
->so_faddr
.s_addr
& htonl(0xffffff00)) == special_addr
.s_addr
) {
325 if ((so
->so_faddr
.s_addr
& htonl(0x000000ff)) == htonl(0xff))
326 saddr
.sin_addr
.s_addr
= alias_addr
.s_addr
;
327 else if (addr
->sin_addr
.s_addr
== loopback_addr
.s_addr
||
328 (ntohl(so
->so_faddr
.s_addr
) & 0xff) != CTL_ALIAS
)
329 saddr
.sin_addr
.s_addr
= so
->so_faddr
.s_addr
;
331 daddr
.sin_addr
= so
->so_laddr
;
332 daddr
.sin_port
= so
->so_lport
;
334 return udp_output2(so
, m
, &saddr
, &daddr
, so
->so_iptos
);
341 struct sockaddr_in addr
;
343 if((so
->s
= socket(AF_INET
,SOCK_DGRAM
,0)) != -1) {
345 * Here, we bind() the socket. Although not really needed
346 * (sendto() on an unbound socket will bind it), it's done
347 * here so that emulation of ytalk etc. don't have to do it
349 addr
.sin_family
= AF_INET
;
351 addr
.sin_addr
.s_addr
= INADDR_ANY
;
352 if(bind(so
->s
, (struct sockaddr
*)&addr
, sizeof(addr
))<0) {
357 WSASetLastError(lasterrno
);
362 /* success, insert in queue */
363 so
->so_expire
= curtime
+ SO_EXPIRE
;
375 /* if (so->so_m) m_free(so->so_m); done by sofree */
380 static const struct tos_t udptos
[] = {
381 {0, 53, IPTOS_LOWDELAY
, 0}, /* DNS */
382 {517, 517, IPTOS_LOWDELAY
, EMU_TALK
}, /* talk */
383 {518, 518, IPTOS_LOWDELAY
, EMU_NTALK
}, /* ntalk */
384 {0, 7648, IPTOS_LOWDELAY
, EMU_CUSEEME
}, /* Cu-Seeme */
389 udp_tos(struct socket
*so
)
393 while(udptos
[i
].tos
) {
394 if ((udptos
[i
].fport
&& ntohs(so
->so_fport
) == udptos
[i
].fport
) ||
395 (udptos
[i
].lport
&& ntohs(so
->so_lport
) == udptos
[i
].lport
)) {
396 so
->so_emu
= udptos
[i
].emu
;
397 return udptos
[i
].tos
;
410 * Here, talk/ytalk/ntalk requests must be emulated
413 udp_emu(struct socket
*so
, struct mbuf
*m
)
415 struct sockaddr_in addr
;
416 socklen_t addrlen
= sizeof(addr
);
420 char buff
[sizeof(CTL_MSG
)];
423 struct talk_request
{
424 struct talk_request
*next
;
425 struct socket
*udp_so
;
426 struct socket
*tcp_so
;
429 static struct talk_request
*req_tbl
= 0;
434 uint16_t d_family
; // destination family
435 uint16_t d_port
; // destination port
436 uint32_t d_addr
; // destination address
437 uint16_t s_family
; // source family
438 uint16_t s_port
; // source port
439 uint32_t so_addr
; // source address
440 uint32_t seqn
; // sequence number
441 uint16_t message
; // message
442 uint16_t data_type
; // data type
443 uint16_t pkt_len
; // packet length
452 * Talk emulation. We always change the ctl_addr to get
453 * some answers from the daemon. When an ANNOUNCE comes,
454 * we send LEAVE_INVITE to the local daemons. Also when a
455 * DELETE comes, we send copies to the local daemons.
457 if (getsockname(so
->s
, (struct sockaddr
*)&addr
, &addrlen
) < 0)
460 #define IS_OLD (so->so_emu == EMU_TALK)
462 #define COPY_MSG(dest, src) { dest->type = src->type; \
463 dest->id_num = src->id_num; \
464 dest->pid = src->pid; \
465 dest->addr = src->addr; \
466 dest->ctl_addr = src->ctl_addr; \
467 memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
468 memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
469 memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); }
471 #define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
472 /* old_sockaddr to sockaddr_in */
475 if (IS_OLD
) { /* old talk */
476 omsg
= mtod(m
, CTL_MSG_OLD
*);
477 nmsg
= (CTL_MSG
*) buff
;
479 OTOSIN(omsg
, ctl_addr
)->sin_port
= addr
.sin_port
;
480 OTOSIN(omsg
, ctl_addr
)->sin_addr
= our_addr
;
481 pstrcpy(omsg
->l_name
, NAME_SIZE_OLD
, getlogin());
482 } else { /* new talk */
483 omsg
= (CTL_MSG_OLD
*) buff
;
484 nmsg
= mtod(m
, CTL_MSG
*);
486 OTOSIN(nmsg
, ctl_addr
)->sin_port
= addr
.sin_port
;
487 OTOSIN(nmsg
, ctl_addr
)->sin_addr
= our_addr
;
488 pstrcpy(nmsg
->l_name
, NAME_SIZE_OLD
, getlogin());
492 return; /* for LOOK_UP this is enough */
494 if (IS_OLD
) { /* make a copy of the message */
495 COPY_MSG(nmsg
, omsg
);
499 COPY_MSG(omsg
, nmsg
);
502 * If if is an ANNOUNCE message, we go through the
503 * request table to see if a tcp port has already
504 * been redirected for this socket. If not, we solisten()
505 * a new socket and add this entry to the table.
506 * The port number of the tcp socket and our IP
507 * are put to the addr field of the message structures.
508 * Then a LEAVE_INVITE is sent to both local daemon
509 * ports, 517 and 518. This is why we have two copies
510 * of the message, one in old talk and one in new talk
514 if (type
== ANNOUNCE
) {
518 for(req
= req_tbl
; req
; req
= req
->next
)
519 if (so
== req
->udp_so
)
520 break; /* found it */
522 if (!req
) { /* no entry for so, create new */
523 req
= (struct talk_request
*)
524 malloc(sizeof(struct talk_request
));
526 req
->tcp_so
= solisten(0,
527 OTOSIN(omsg
, addr
)->sin_addr
.s_addr
,
528 OTOSIN(omsg
, addr
)->sin_port
,
534 /* replace port number in addr field */
535 addrlen
= sizeof(addr
);
536 getsockname(req
->tcp_so
->s
,
537 (struct sockaddr
*) &addr
,
539 OTOSIN(omsg
, addr
)->sin_port
= addr
.sin_port
;
540 OTOSIN(omsg
, addr
)->sin_addr
= our_addr
;
541 OTOSIN(nmsg
, addr
)->sin_port
= addr
.sin_port
;
542 OTOSIN(nmsg
, addr
)->sin_addr
= our_addr
;
544 /* send LEAVE_INVITEs */
545 temp_port
= OTOSIN(omsg
, ctl_addr
)->sin_port
;
546 OTOSIN(omsg
, ctl_addr
)->sin_port
= 0;
547 OTOSIN(nmsg
, ctl_addr
)->sin_port
= 0;
548 omsg
->type
= nmsg
->type
= LEAVE_INVITE
;
550 s
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
551 addr
.sin_addr
= our_addr
;
552 addr
.sin_family
= AF_INET
;
553 addr
.sin_port
= htons(517);
554 sendto(s
, (char *)omsg
, sizeof(*omsg
), 0,
555 (struct sockaddr
*)&addr
, sizeof(addr
));
556 addr
.sin_port
= htons(518);
557 sendto(s
, (char *)nmsg
, sizeof(*nmsg
), 0,
558 (struct sockaddr
*) &addr
, sizeof(addr
));
561 omsg
->type
= nmsg
->type
= ANNOUNCE
;
562 OTOSIN(omsg
, ctl_addr
)->sin_port
= temp_port
;
563 OTOSIN(nmsg
, ctl_addr
)->sin_port
= temp_port
;
567 * If it is a DELETE message, we send a copy to the
568 * local daemons. Then we delete the entry corresponding
569 * to our socket from the request table.
572 if (type
== DELETE
) {
573 struct talk_request
*temp_req
, *req_next
;
577 temp_port
= OTOSIN(omsg
, ctl_addr
)->sin_port
;
578 OTOSIN(omsg
, ctl_addr
)->sin_port
= 0;
579 OTOSIN(nmsg
, ctl_addr
)->sin_port
= 0;
581 s
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
582 addr
.sin_addr
= our_addr
;
583 addr
.sin_family
= AF_INET
;
584 addr
.sin_port
= htons(517);
585 sendto(s
, (char *)omsg
, sizeof(*omsg
), 0,
586 (struct sockaddr
*)&addr
, sizeof(addr
));
587 addr
.sin_port
= htons(518);
588 sendto(s
, (char *)nmsg
, sizeof(*nmsg
), 0,
589 (struct sockaddr
*)&addr
, sizeof(addr
));
592 OTOSIN(omsg
, ctl_addr
)->sin_port
= temp_port
;
593 OTOSIN(nmsg
, ctl_addr
)->sin_port
= temp_port
;
595 /* delete table entry */
596 if (so
== req_tbl
->udp_so
) {
598 req_tbl
= req_tbl
->next
;
602 for(req
= req_tbl
->next
; req
; req
= req_next
) {
603 req_next
= req
->next
;
604 if (so
== req
->udp_so
) {
605 temp_req
->next
= req_next
;
621 * Cu-SeeMe emulation.
622 * Hopefully the packet is more that 16 bytes long. We don't
623 * do any other tests, just replace the address and port
626 if (m
->m_len
>= sizeof (*cu_head
)) {
627 if (getsockname(so
->s
, (struct sockaddr
*)&addr
, &addrlen
) < 0)
629 cu_head
= mtod(m
, struct cu_header
*);
630 cu_head
->s_port
= addr
.sin_port
;
631 cu_head
->so_addr
= our_addr
.s_addr
;
639 udp_listen(port
, laddr
, lport
, flags
)
645 struct sockaddr_in addr
;
647 socklen_t addrlen
= sizeof(struct sockaddr_in
), opt
= 1;
649 if ((so
= socreate()) == NULL
) {
653 so
->s
= socket(AF_INET
,SOCK_DGRAM
,0);
654 so
->so_expire
= curtime
+ SO_EXPIRE
;
657 addr
.sin_family
= AF_INET
;
658 addr
.sin_addr
.s_addr
= INADDR_ANY
;
659 addr
.sin_port
= port
;
661 if (bind(so
->s
,(struct sockaddr
*)&addr
, addrlen
) < 0) {
665 setsockopt(so
->s
,SOL_SOCKET
,SO_REUSEADDR
,(char *)&opt
,sizeof(int));
666 /* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */
668 getsockname(so
->s
,(struct sockaddr
*)&addr
,&addrlen
);
669 so
->so_fport
= addr
.sin_port
;
670 if (addr
.sin_addr
.s_addr
== 0 || addr
.sin_addr
.s_addr
== loopback_addr
.s_addr
)
671 so
->so_faddr
= alias_addr
;
673 so
->so_faddr
= addr
.sin_addr
;
675 so
->so_lport
= lport
;
676 so
->so_laddr
.s_addr
= laddr
;
677 if (flags
!= SS_FACCEPTONCE
)
680 so
->so_state
= SS_ISFCONNECTED
;