240e1bf38aa9fc35c8a32941983299beee69fccd
2 * Copyright (c) 1982, 1986, 1988, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
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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.
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11 * notice, this list of conditions and the following disclaimer in the
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14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
30 * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
34 * Changes and additions relating to SLiRP
35 * Copyright (c) 1995 Danny Gasparovski.
37 * Please read the file COPYRIGHT for the
38 * terms and conditions of the copyright.
46 static u_int8_t
udp_tos(struct socket
*so
);
47 static void udp_emu(struct socket
*so
, struct mbuf
*m
);
49 struct socket
*udp_last_so
= &udb
;
54 udb
.so_next
= udb
.so_prev
= &udb
;
56 /* m->m_data points at ip packet header
57 * m->m_len length ip packet
58 * ip->ip_len length data (IPDU)
61 udp_input(register struct mbuf
*m
, int iphlen
)
63 register struct ip
*ip
;
64 register struct udphdr
*uh
;
69 DEBUG_CALL("udp_input");
70 DEBUG_ARG("m = %lx", (long)m
);
71 DEBUG_ARG("iphlen = %d", iphlen
);
74 * Strip IP options, if any; should skip this,
75 * make available to user, and use on returned packets,
76 * but we don't yet have a way to check the checksum
77 * with options still present.
79 if(iphlen
> sizeof(struct ip
)) {
80 ip_stripoptions(m
, (struct mbuf
*)0);
81 iphlen
= sizeof(struct ip
);
85 * Get IP and UDP header together in first mbuf.
87 ip
= mtod(m
, struct ip
*);
88 uh
= (struct udphdr
*)((caddr_t
)ip
+ iphlen
);
91 * Make mbuf data length reflect UDP length.
92 * If not enough data to reflect UDP length, drop.
94 len
= ntohs((u_int16_t
)uh
->uh_ulen
);
96 if (ip
->ip_len
!= len
) {
97 if (len
> ip
->ip_len
) {
100 m_adj(m
, len
- ip
->ip_len
);
105 * Save a copy of the IP header in case we want restore it
106 * for sending an ICMP error message in response.
109 save_ip
.ip_len
+= iphlen
; /* tcp_input subtracts this */
112 * Checksum extended UDP header and data.
115 memset(&((struct ipovly
*)ip
)->ih_mbuf
, 0, sizeof(struct mbuf_ptr
));
116 ((struct ipovly
*)ip
)->ih_x1
= 0;
117 ((struct ipovly
*)ip
)->ih_len
= uh
->uh_ulen
;
118 if(cksum(m
, len
+ sizeof(struct ip
))) {
126 if (ntohs(uh
->uh_dport
) == BOOTP_SERVER
) {
137 if (ntohs(uh
->uh_dport
) == TFTP_SERVER
) {
143 * Locate pcb for datagram.
146 if (so
->so_lport
!= uh
->uh_sport
||
147 so
->so_laddr
.s_addr
!= ip
->ip_src
.s_addr
) {
150 for (tmp
= udb
.so_next
; tmp
!= &udb
; tmp
= tmp
->so_next
) {
151 if (tmp
->so_lport
== uh
->uh_sport
&&
152 tmp
->so_laddr
.s_addr
== ip
->ip_src
.s_addr
) {
166 * If there's no socket for this packet,
169 if ((so
= socreate()) == NULL
) goto bad
;
170 if(udp_attach(so
) == -1) {
171 DEBUG_MISC((dfd
," udp_attach errno = %d-%s\n",
172 errno
,strerror(errno
)));
180 so
->so_laddr
= ip
->ip_src
;
181 so
->so_lport
= uh
->uh_sport
;
183 if ((so
->so_iptos
= udp_tos(so
)) == 0)
184 so
->so_iptos
= ip
->ip_tos
;
187 * XXXXX Here, check if it's in udpexec_list,
188 * and if it is, do the fork_exec() etc.
192 so
->so_faddr
= ip
->ip_dst
; /* XXX */
193 so
->so_fport
= uh
->uh_dport
; /* XXX */
195 iphlen
+= sizeof(struct udphdr
);
200 * Now we sendto() the packet.
205 if(sosendto(so
,m
) == -1) {
209 DEBUG_MISC((dfd
,"udp tx errno = %d-%s\n",errno
,strerror(errno
)));
210 icmp_error(m
, ICMP_UNREACH
,ICMP_UNREACH_NET
, 0,strerror(errno
));
213 m_free(so
->so_m
); /* used for ICMP if error on sorecvfrom */
215 /* restore the orig mbuf packet */
219 so
->so_m
=m
; /* ICMP backup */
227 int udp_output2(struct socket
*so
, struct mbuf
*m
,
228 struct sockaddr_in
*saddr
, struct sockaddr_in
*daddr
,
231 register struct udpiphdr
*ui
;
234 DEBUG_CALL("udp_output");
235 DEBUG_ARG("so = %lx", (long)so
);
236 DEBUG_ARG("m = %lx", (long)m
);
237 DEBUG_ARG("saddr = %lx", (long)saddr
->sin_addr
.s_addr
);
238 DEBUG_ARG("daddr = %lx", (long)daddr
->sin_addr
.s_addr
);
243 m
->m_data
-= sizeof(struct udpiphdr
);
244 m
->m_len
+= sizeof(struct udpiphdr
);
247 * Fill in mbuf with extended UDP header
248 * and addresses and length put into network format.
250 ui
= mtod(m
, struct udpiphdr
*);
251 memset(&ui
->ui_i
.ih_mbuf
, 0 , sizeof(struct mbuf_ptr
));
253 ui
->ui_pr
= IPPROTO_UDP
;
254 ui
->ui_len
= htons(m
->m_len
- sizeof(struct ip
));
255 /* XXXXX Check for from-one-location sockets, or from-any-location sockets */
256 ui
->ui_src
= saddr
->sin_addr
;
257 ui
->ui_dst
= daddr
->sin_addr
;
258 ui
->ui_sport
= saddr
->sin_port
;
259 ui
->ui_dport
= daddr
->sin_port
;
260 ui
->ui_ulen
= ui
->ui_len
;
263 * Stuff checksum and output datagram.
266 if ((ui
->ui_sum
= cksum(m
, m
->m_len
)) == 0)
268 ((struct ip
*)ui
)->ip_len
= m
->m_len
;
270 ((struct ip
*)ui
)->ip_ttl
= IPDEFTTL
;
271 ((struct ip
*)ui
)->ip_tos
= iptos
;
273 error
= ip_output(so
, m
);
278 int udp_output(struct socket
*so
, struct mbuf
*m
,
279 struct sockaddr_in
*addr
)
282 struct sockaddr_in saddr
, daddr
;
285 if ((so
->so_faddr
.s_addr
& vnetwork_mask
.s_addr
) == vnetwork_addr
.s_addr
) {
286 if ((so
->so_faddr
.s_addr
& ~vnetwork_mask
.s_addr
) ==
287 ~vnetwork_mask
.s_addr
) {
288 saddr
.sin_addr
= vhost_addr
;
289 } else if (addr
->sin_addr
.s_addr
== loopback_addr
.s_addr
||
290 so
->so_faddr
.s_addr
!= vhost_addr
.s_addr
) {
291 saddr
.sin_addr
= so
->so_faddr
;
294 daddr
.sin_addr
= so
->so_laddr
;
295 daddr
.sin_port
= so
->so_lport
;
297 return udp_output2(so
, m
, &saddr
, &daddr
, so
->so_iptos
);
301 udp_attach(struct socket
*so
)
303 struct sockaddr_in addr
;
305 if((so
->s
= socket(AF_INET
,SOCK_DGRAM
,0)) != -1) {
307 * Here, we bind() the socket. Although not really needed
308 * (sendto() on an unbound socket will bind it), it's done
309 * here so that emulation of ytalk etc. don't have to do it
311 addr
.sin_family
= AF_INET
;
313 addr
.sin_addr
.s_addr
= INADDR_ANY
;
314 if(bind(so
->s
, (struct sockaddr
*)&addr
, sizeof(addr
))<0) {
319 WSASetLastError(lasterrno
);
324 /* success, insert in queue */
325 so
->so_expire
= curtime
+ SO_EXPIRE
;
333 udp_detach(struct socket
*so
)
339 static const struct tos_t udptos
[] = {
340 {0, 53, IPTOS_LOWDELAY
, 0}, /* DNS */
341 {517, 517, IPTOS_LOWDELAY
, EMU_TALK
}, /* talk */
342 {518, 518, IPTOS_LOWDELAY
, EMU_NTALK
}, /* ntalk */
343 {0, 7648, IPTOS_LOWDELAY
, EMU_CUSEEME
}, /* Cu-Seeme */
348 udp_tos(struct socket
*so
)
352 while(udptos
[i
].tos
) {
353 if ((udptos
[i
].fport
&& ntohs(so
->so_fport
) == udptos
[i
].fport
) ||
354 (udptos
[i
].lport
&& ntohs(so
->so_lport
) == udptos
[i
].lport
)) {
355 so
->so_emu
= udptos
[i
].emu
;
356 return udptos
[i
].tos
;
369 * Here, talk/ytalk/ntalk requests must be emulated
372 udp_emu(struct socket
*so
, struct mbuf
*m
)
374 struct sockaddr_in addr
;
375 socklen_t addrlen
= sizeof(addr
);
379 char buff
[sizeof(CTL_MSG
)];
382 struct talk_request
{
383 struct talk_request
*next
;
384 struct socket
*udp_so
;
385 struct socket
*tcp_so
;
388 static struct talk_request
*req_tbl
= 0;
393 uint16_t d_family
; // destination family
394 uint16_t d_port
; // destination port
395 uint32_t d_addr
; // destination address
396 uint16_t s_family
; // source family
397 uint16_t s_port
; // source port
398 uint32_t so_addr
; // source address
399 uint32_t seqn
; // sequence number
400 uint16_t message
; // message
401 uint16_t data_type
; // data type
402 uint16_t pkt_len
; // packet length
411 * Talk emulation. We always change the ctl_addr to get
412 * some answers from the daemon. When an ANNOUNCE comes,
413 * we send LEAVE_INVITE to the local daemons. Also when a
414 * DELETE comes, we send copies to the local daemons.
416 if (getsockname(so
->s
, (struct sockaddr
*)&addr
, &addrlen
) < 0)
419 #define IS_OLD (so->so_emu == EMU_TALK)
421 #define COPY_MSG(dest, src) { dest->type = src->type; \
422 dest->id_num = src->id_num; \
423 dest->pid = src->pid; \
424 dest->addr = src->addr; \
425 dest->ctl_addr = src->ctl_addr; \
426 memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
427 memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
428 memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); }
430 #define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
431 /* old_sockaddr to sockaddr_in */
434 if (IS_OLD
) { /* old talk */
435 omsg
= mtod(m
, CTL_MSG_OLD
*);
436 nmsg
= (CTL_MSG
*) buff
;
438 OTOSIN(omsg
, ctl_addr
)->sin_port
= addr
.sin_port
;
439 OTOSIN(omsg
, ctl_addr
)->sin_addr
= our_addr
;
440 pstrcpy(omsg
->l_name
, NAME_SIZE_OLD
, getlogin());
441 } else { /* new talk */
442 omsg
= (CTL_MSG_OLD
*) buff
;
443 nmsg
= mtod(m
, CTL_MSG
*);
445 OTOSIN(nmsg
, ctl_addr
)->sin_port
= addr
.sin_port
;
446 OTOSIN(nmsg
, ctl_addr
)->sin_addr
= our_addr
;
447 pstrcpy(nmsg
->l_name
, NAME_SIZE_OLD
, getlogin());
451 return; /* for LOOK_UP this is enough */
453 if (IS_OLD
) { /* make a copy of the message */
454 COPY_MSG(nmsg
, omsg
);
458 COPY_MSG(omsg
, nmsg
);
461 * If if is an ANNOUNCE message, we go through the
462 * request table to see if a tcp port has already
463 * been redirected for this socket. If not, we solisten()
464 * a new socket and add this entry to the table.
465 * The port number of the tcp socket and our IP
466 * are put to the addr field of the message structures.
467 * Then a LEAVE_INVITE is sent to both local daemon
468 * ports, 517 and 518. This is why we have two copies
469 * of the message, one in old talk and one in new talk
473 if (type
== ANNOUNCE
) {
477 for(req
= req_tbl
; req
; req
= req
->next
)
478 if (so
== req
->udp_so
)
479 break; /* found it */
481 if (!req
) { /* no entry for so, create new */
482 req
= (struct talk_request
*)
483 malloc(sizeof(struct talk_request
));
485 req
->tcp_so
= solisten(0,
486 OTOSIN(omsg
, addr
)->sin_addr
.s_addr
,
487 OTOSIN(omsg
, addr
)->sin_port
,
493 /* replace port number in addr field */
494 addrlen
= sizeof(addr
);
495 getsockname(req
->tcp_so
->s
,
496 (struct sockaddr
*) &addr
,
498 OTOSIN(omsg
, addr
)->sin_port
= addr
.sin_port
;
499 OTOSIN(omsg
, addr
)->sin_addr
= our_addr
;
500 OTOSIN(nmsg
, addr
)->sin_port
= addr
.sin_port
;
501 OTOSIN(nmsg
, addr
)->sin_addr
= our_addr
;
503 /* send LEAVE_INVITEs */
504 temp_port
= OTOSIN(omsg
, ctl_addr
)->sin_port
;
505 OTOSIN(omsg
, ctl_addr
)->sin_port
= 0;
506 OTOSIN(nmsg
, ctl_addr
)->sin_port
= 0;
507 omsg
->type
= nmsg
->type
= LEAVE_INVITE
;
509 s
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
510 addr
.sin_addr
= our_addr
;
511 addr
.sin_family
= AF_INET
;
512 addr
.sin_port
= htons(517);
513 sendto(s
, (char *)omsg
, sizeof(*omsg
), 0,
514 (struct sockaddr
*)&addr
, sizeof(addr
));
515 addr
.sin_port
= htons(518);
516 sendto(s
, (char *)nmsg
, sizeof(*nmsg
), 0,
517 (struct sockaddr
*) &addr
, sizeof(addr
));
520 omsg
->type
= nmsg
->type
= ANNOUNCE
;
521 OTOSIN(omsg
, ctl_addr
)->sin_port
= temp_port
;
522 OTOSIN(nmsg
, ctl_addr
)->sin_port
= temp_port
;
526 * If it is a DELETE message, we send a copy to the
527 * local daemons. Then we delete the entry corresponding
528 * to our socket from the request table.
531 if (type
== DELETE
) {
532 struct talk_request
*temp_req
, *req_next
;
536 temp_port
= OTOSIN(omsg
, ctl_addr
)->sin_port
;
537 OTOSIN(omsg
, ctl_addr
)->sin_port
= 0;
538 OTOSIN(nmsg
, ctl_addr
)->sin_port
= 0;
540 s
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
541 addr
.sin_addr
= our_addr
;
542 addr
.sin_family
= AF_INET
;
543 addr
.sin_port
= htons(517);
544 sendto(s
, (char *)omsg
, sizeof(*omsg
), 0,
545 (struct sockaddr
*)&addr
, sizeof(addr
));
546 addr
.sin_port
= htons(518);
547 sendto(s
, (char *)nmsg
, sizeof(*nmsg
), 0,
548 (struct sockaddr
*)&addr
, sizeof(addr
));
551 OTOSIN(omsg
, ctl_addr
)->sin_port
= temp_port
;
552 OTOSIN(nmsg
, ctl_addr
)->sin_port
= temp_port
;
554 /* delete table entry */
555 if (so
== req_tbl
->udp_so
) {
557 req_tbl
= req_tbl
->next
;
561 for(req
= req_tbl
->next
; req
; req
= req_next
) {
562 req_next
= req
->next
;
563 if (so
== req
->udp_so
) {
564 temp_req
->next
= req_next
;
580 * Cu-SeeMe emulation.
581 * Hopefully the packet is more that 16 bytes long. We don't
582 * do any other tests, just replace the address and port
585 if (m
->m_len
>= sizeof (*cu_head
)) {
586 if (getsockname(so
->s
, (struct sockaddr
*)&addr
, &addrlen
) < 0)
588 cu_head
= mtod(m
, struct cu_header
*);
589 cu_head
->s_port
= addr
.sin_port
;
590 cu_head
->so_addr
= our_addr
.s_addr
;
598 udp_listen(u_int32_t haddr
, u_int hport
, u_int32_t laddr
, u_int lport
,
601 struct sockaddr_in addr
;
603 socklen_t addrlen
= sizeof(struct sockaddr_in
), opt
= 1;
605 if ((so
= socreate()) == NULL
) {
609 so
->s
= socket(AF_INET
,SOCK_DGRAM
,0);
610 so
->so_expire
= curtime
+ SO_EXPIRE
;
613 addr
.sin_family
= AF_INET
;
614 addr
.sin_addr
.s_addr
= haddr
;
615 addr
.sin_port
= hport
;
617 if (bind(so
->s
,(struct sockaddr
*)&addr
, addrlen
) < 0) {
621 setsockopt(so
->s
,SOL_SOCKET
,SO_REUSEADDR
,(char *)&opt
,sizeof(int));
623 getsockname(so
->s
,(struct sockaddr
*)&addr
,&addrlen
);
624 so
->so_fport
= addr
.sin_port
;
625 if (addr
.sin_addr
.s_addr
== 0 ||
626 addr
.sin_addr
.s_addr
== loopback_addr
.s_addr
) {
627 so
->so_faddr
= vhost_addr
;
629 so
->so_faddr
= addr
.sin_addr
;
631 so
->so_lport
= lport
;
632 so
->so_laddr
.s_addr
= laddr
;
633 if (flags
!= SS_FACCEPTONCE
)
636 so
->so_state
&= SS_PERSISTENT_MASK
;
637 so
->so_state
|= SS_ISFCONNECTED
| flags
;