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. Neither the name of the University nor the names of its contributors
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
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.
45 struct udpstat udpstat
;
50 static u_int8_t
udp_tos(struct socket
*so
);
51 static void udp_emu(struct socket
*so
, struct mbuf
*m
);
54 * UDP protocol implementation.
55 * Per RFC 768, August, 1980.
60 #define UDPCKSUM 0 /* XXX */
63 struct socket
*udp_last_so
= &udb
;
68 udb
.so_next
= udb
.so_prev
= &udb
;
70 /* m->m_data points at ip packet header
71 * m->m_len length ip packet
72 * ip->ip_len length data (IPDU)
75 udp_input(register struct mbuf
*m
, int iphlen
)
77 register struct ip
*ip
;
78 register struct udphdr
*uh
;
79 /* struct mbuf *opts = 0;*/
84 DEBUG_CALL("udp_input");
85 DEBUG_ARG("m = %lx", (long)m
);
86 DEBUG_ARG("iphlen = %d", iphlen
);
88 STAT(udpstat
.udps_ipackets
++);
91 * Strip IP options, if any; should skip this,
92 * make available to user, and use on returned packets,
93 * but we don't yet have a way to check the checksum
94 * with options still present.
96 if(iphlen
> sizeof(struct ip
)) {
97 ip_stripoptions(m
, (struct mbuf
*)0);
98 iphlen
= sizeof(struct ip
);
102 * Get IP and UDP header together in first mbuf.
104 ip
= mtod(m
, struct ip
*);
105 uh
= (struct udphdr
*)((caddr_t
)ip
+ iphlen
);
108 * Make mbuf data length reflect UDP length.
109 * If not enough data to reflect UDP length, drop.
111 len
= ntohs((u_int16_t
)uh
->uh_ulen
);
113 if (ip
->ip_len
!= len
) {
114 if (len
> ip
->ip_len
) {
115 STAT(udpstat
.udps_badlen
++);
118 m_adj(m
, len
- ip
->ip_len
);
123 * Save a copy of the IP header in case we want restore it
124 * for sending an ICMP error message in response.
127 save_ip
.ip_len
+= iphlen
; /* tcp_input subtracts this */
130 * Checksum extended UDP header and data.
132 if (UDPCKSUM
&& uh
->uh_sum
) {
133 memset(&((struct ipovly
*)ip
)->ih_mbuf
, 0, sizeof(struct mbuf_ptr
));
134 ((struct ipovly
*)ip
)->ih_x1
= 0;
135 ((struct ipovly
*)ip
)->ih_len
= uh
->uh_ulen
;
136 /* keep uh_sum for ICMP reply
137 * uh->uh_sum = cksum(m, len + sizeof (struct ip));
140 if(cksum(m
, len
+ sizeof(struct ip
))) {
141 STAT(udpstat
.udps_badsum
++);
149 if (ntohs(uh
->uh_dport
) == BOOTP_SERVER
) {
160 if (ntohs(uh
->uh_dport
) == TFTP_SERVER
) {
166 * Locate pcb for datagram.
169 if (so
->so_lport
!= uh
->uh_sport
||
170 so
->so_laddr
.s_addr
!= ip
->ip_src
.s_addr
) {
173 for (tmp
= udb
.so_next
; tmp
!= &udb
; tmp
= tmp
->so_next
) {
174 if (tmp
->so_lport
== uh
->uh_sport
&&
175 tmp
->so_laddr
.s_addr
== ip
->ip_src
.s_addr
) {
183 STAT(udpstat
.udpps_pcbcachemiss
++);
190 * If there's no socket for this packet,
193 if ((so
= socreate()) == NULL
) goto bad
;
194 if(udp_attach(so
) == -1) {
195 DEBUG_MISC((dfd
," udp_attach errno = %d-%s\n",
196 errno
,strerror(errno
)));
204 /* udp_last_so = so; */
205 so
->so_laddr
= ip
->ip_src
;
206 so
->so_lport
= uh
->uh_sport
;
208 if ((so
->so_iptos
= udp_tos(so
)) == 0)
209 so
->so_iptos
= ip
->ip_tos
;
212 * XXXXX Here, check if it's in udpexec_list,
213 * and if it is, do the fork_exec() etc.
217 so
->so_faddr
= ip
->ip_dst
; /* XXX */
218 so
->so_fport
= uh
->uh_dport
; /* XXX */
220 iphlen
+= sizeof(struct udphdr
);
225 * Now we sendto() the packet.
230 if(sosendto(so
,m
) == -1) {
234 DEBUG_MISC((dfd
,"udp tx errno = %d-%s\n",errno
,strerror(errno
)));
235 icmp_error(m
, ICMP_UNREACH
,ICMP_UNREACH_NET
, 0,strerror(errno
));
238 m_free(so
->so_m
); /* used for ICMP if error on sorecvfrom */
240 /* restore the orig mbuf packet */
244 so
->so_m
=m
; /* ICMP backup */
249 /* if (opts) m_freem(opts); */
253 int udp_output2(struct socket
*so
, struct mbuf
*m
,
254 struct sockaddr_in
*saddr
, struct sockaddr_in
*daddr
,
257 register struct udpiphdr
*ui
;
260 DEBUG_CALL("udp_output");
261 DEBUG_ARG("so = %lx", (long)so
);
262 DEBUG_ARG("m = %lx", (long)m
);
263 DEBUG_ARG("saddr = %lx", (long)saddr
->sin_addr
.s_addr
);
264 DEBUG_ARG("daddr = %lx", (long)daddr
->sin_addr
.s_addr
);
269 m
->m_data
-= sizeof(struct udpiphdr
);
270 m
->m_len
+= sizeof(struct udpiphdr
);
273 * Fill in mbuf with extended UDP header
274 * and addresses and length put into network format.
276 ui
= mtod(m
, struct udpiphdr
*);
277 memset(&ui
->ui_i
.ih_mbuf
, 0 , sizeof(struct mbuf_ptr
));
279 ui
->ui_pr
= IPPROTO_UDP
;
280 ui
->ui_len
= htons(m
->m_len
- sizeof(struct ip
)); /* + sizeof (struct udphdr)); */
281 /* XXXXX Check for from-one-location sockets, or from-any-location sockets */
282 ui
->ui_src
= saddr
->sin_addr
;
283 ui
->ui_dst
= daddr
->sin_addr
;
284 ui
->ui_sport
= saddr
->sin_port
;
285 ui
->ui_dport
= daddr
->sin_port
;
286 ui
->ui_ulen
= ui
->ui_len
;
289 * Stuff checksum and output datagram.
293 if ((ui
->ui_sum
= cksum(m
, /* sizeof (struct udpiphdr) + */ m
->m_len
)) == 0)
296 ((struct ip
*)ui
)->ip_len
= m
->m_len
;
298 ((struct ip
*)ui
)->ip_ttl
= IPDEFTTL
;
299 ((struct ip
*)ui
)->ip_tos
= iptos
;
301 STAT(udpstat
.udps_opackets
++);
303 error
= ip_output(so
, m
);
308 int udp_output(struct socket
*so
, struct mbuf
*m
,
309 struct sockaddr_in
*addr
)
312 struct sockaddr_in saddr
, daddr
;
315 if ((so
->so_faddr
.s_addr
& vnetwork_mask
.s_addr
) == vnetwork_addr
.s_addr
) {
316 if ((so
->so_faddr
.s_addr
& ~vnetwork_mask
.s_addr
) ==
317 ~vnetwork_mask
.s_addr
) {
318 saddr
.sin_addr
= vhost_addr
;
319 } else if (addr
->sin_addr
.s_addr
== loopback_addr
.s_addr
||
320 so
->so_faddr
.s_addr
!= vhost_addr
.s_addr
) {
321 saddr
.sin_addr
= so
->so_faddr
;
324 daddr
.sin_addr
= so
->so_laddr
;
325 daddr
.sin_port
= so
->so_lport
;
327 return udp_output2(so
, m
, &saddr
, &daddr
, so
->so_iptos
);
331 udp_attach(struct socket
*so
)
333 struct sockaddr_in addr
;
335 if((so
->s
= socket(AF_INET
,SOCK_DGRAM
,0)) != -1) {
337 * Here, we bind() the socket. Although not really needed
338 * (sendto() on an unbound socket will bind it), it's done
339 * here so that emulation of ytalk etc. don't have to do it
341 addr
.sin_family
= AF_INET
;
343 addr
.sin_addr
.s_addr
= INADDR_ANY
;
344 if(bind(so
->s
, (struct sockaddr
*)&addr
, sizeof(addr
))<0) {
349 WSASetLastError(lasterrno
);
354 /* success, insert in queue */
355 so
->so_expire
= curtime
+ SO_EXPIRE
;
363 udp_detach(struct socket
*so
)
366 /* if (so->so_m) m_free(so->so_m); done by sofree */
371 static const struct tos_t udptos
[] = {
372 {0, 53, IPTOS_LOWDELAY
, 0}, /* DNS */
373 {517, 517, IPTOS_LOWDELAY
, EMU_TALK
}, /* talk */
374 {518, 518, IPTOS_LOWDELAY
, EMU_NTALK
}, /* ntalk */
375 {0, 7648, IPTOS_LOWDELAY
, EMU_CUSEEME
}, /* Cu-Seeme */
380 udp_tos(struct socket
*so
)
384 while(udptos
[i
].tos
) {
385 if ((udptos
[i
].fport
&& ntohs(so
->so_fport
) == udptos
[i
].fport
) ||
386 (udptos
[i
].lport
&& ntohs(so
->so_lport
) == udptos
[i
].lport
)) {
387 so
->so_emu
= udptos
[i
].emu
;
388 return udptos
[i
].tos
;
401 * Here, talk/ytalk/ntalk requests must be emulated
404 udp_emu(struct socket
*so
, struct mbuf
*m
)
406 struct sockaddr_in addr
;
407 socklen_t addrlen
= sizeof(addr
);
411 char buff
[sizeof(CTL_MSG
)];
414 struct talk_request
{
415 struct talk_request
*next
;
416 struct socket
*udp_so
;
417 struct socket
*tcp_so
;
420 static struct talk_request
*req_tbl
= 0;
425 uint16_t d_family
; // destination family
426 uint16_t d_port
; // destination port
427 uint32_t d_addr
; // destination address
428 uint16_t s_family
; // source family
429 uint16_t s_port
; // source port
430 uint32_t so_addr
; // source address
431 uint32_t seqn
; // sequence number
432 uint16_t message
; // message
433 uint16_t data_type
; // data type
434 uint16_t pkt_len
; // packet length
443 * Talk emulation. We always change the ctl_addr to get
444 * some answers from the daemon. When an ANNOUNCE comes,
445 * we send LEAVE_INVITE to the local daemons. Also when a
446 * DELETE comes, we send copies to the local daemons.
448 if (getsockname(so
->s
, (struct sockaddr
*)&addr
, &addrlen
) < 0)
451 #define IS_OLD (so->so_emu == EMU_TALK)
453 #define COPY_MSG(dest, src) { dest->type = src->type; \
454 dest->id_num = src->id_num; \
455 dest->pid = src->pid; \
456 dest->addr = src->addr; \
457 dest->ctl_addr = src->ctl_addr; \
458 memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
459 memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
460 memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); }
462 #define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
463 /* old_sockaddr to sockaddr_in */
466 if (IS_OLD
) { /* old talk */
467 omsg
= mtod(m
, CTL_MSG_OLD
*);
468 nmsg
= (CTL_MSG
*) buff
;
470 OTOSIN(omsg
, ctl_addr
)->sin_port
= addr
.sin_port
;
471 OTOSIN(omsg
, ctl_addr
)->sin_addr
= our_addr
;
472 pstrcpy(omsg
->l_name
, NAME_SIZE_OLD
, getlogin());
473 } else { /* new talk */
474 omsg
= (CTL_MSG_OLD
*) buff
;
475 nmsg
= mtod(m
, CTL_MSG
*);
477 OTOSIN(nmsg
, ctl_addr
)->sin_port
= addr
.sin_port
;
478 OTOSIN(nmsg
, ctl_addr
)->sin_addr
= our_addr
;
479 pstrcpy(nmsg
->l_name
, NAME_SIZE_OLD
, getlogin());
483 return; /* for LOOK_UP this is enough */
485 if (IS_OLD
) { /* make a copy of the message */
486 COPY_MSG(nmsg
, omsg
);
490 COPY_MSG(omsg
, nmsg
);
493 * If if is an ANNOUNCE message, we go through the
494 * request table to see if a tcp port has already
495 * been redirected for this socket. If not, we solisten()
496 * a new socket and add this entry to the table.
497 * The port number of the tcp socket and our IP
498 * are put to the addr field of the message structures.
499 * Then a LEAVE_INVITE is sent to both local daemon
500 * ports, 517 and 518. This is why we have two copies
501 * of the message, one in old talk and one in new talk
505 if (type
== ANNOUNCE
) {
509 for(req
= req_tbl
; req
; req
= req
->next
)
510 if (so
== req
->udp_so
)
511 break; /* found it */
513 if (!req
) { /* no entry for so, create new */
514 req
= (struct talk_request
*)
515 malloc(sizeof(struct talk_request
));
517 req
->tcp_so
= solisten(0,
518 OTOSIN(omsg
, addr
)->sin_addr
.s_addr
,
519 OTOSIN(omsg
, addr
)->sin_port
,
525 /* replace port number in addr field */
526 addrlen
= sizeof(addr
);
527 getsockname(req
->tcp_so
->s
,
528 (struct sockaddr
*) &addr
,
530 OTOSIN(omsg
, addr
)->sin_port
= addr
.sin_port
;
531 OTOSIN(omsg
, addr
)->sin_addr
= our_addr
;
532 OTOSIN(nmsg
, addr
)->sin_port
= addr
.sin_port
;
533 OTOSIN(nmsg
, addr
)->sin_addr
= our_addr
;
535 /* send LEAVE_INVITEs */
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;
539 omsg
->type
= nmsg
->type
= LEAVE_INVITE
;
541 s
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
542 addr
.sin_addr
= our_addr
;
543 addr
.sin_family
= AF_INET
;
544 addr
.sin_port
= htons(517);
545 sendto(s
, (char *)omsg
, sizeof(*omsg
), 0,
546 (struct sockaddr
*)&addr
, sizeof(addr
));
547 addr
.sin_port
= htons(518);
548 sendto(s
, (char *)nmsg
, sizeof(*nmsg
), 0,
549 (struct sockaddr
*) &addr
, sizeof(addr
));
552 omsg
->type
= nmsg
->type
= ANNOUNCE
;
553 OTOSIN(omsg
, ctl_addr
)->sin_port
= temp_port
;
554 OTOSIN(nmsg
, ctl_addr
)->sin_port
= temp_port
;
558 * If it is a DELETE message, we send a copy to the
559 * local daemons. Then we delete the entry corresponding
560 * to our socket from the request table.
563 if (type
== DELETE
) {
564 struct talk_request
*temp_req
, *req_next
;
568 temp_port
= OTOSIN(omsg
, ctl_addr
)->sin_port
;
569 OTOSIN(omsg
, ctl_addr
)->sin_port
= 0;
570 OTOSIN(nmsg
, ctl_addr
)->sin_port
= 0;
572 s
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_IP
);
573 addr
.sin_addr
= our_addr
;
574 addr
.sin_family
= AF_INET
;
575 addr
.sin_port
= htons(517);
576 sendto(s
, (char *)omsg
, sizeof(*omsg
), 0,
577 (struct sockaddr
*)&addr
, sizeof(addr
));
578 addr
.sin_port
= htons(518);
579 sendto(s
, (char *)nmsg
, sizeof(*nmsg
), 0,
580 (struct sockaddr
*)&addr
, sizeof(addr
));
583 OTOSIN(omsg
, ctl_addr
)->sin_port
= temp_port
;
584 OTOSIN(nmsg
, ctl_addr
)->sin_port
= temp_port
;
586 /* delete table entry */
587 if (so
== req_tbl
->udp_so
) {
589 req_tbl
= req_tbl
->next
;
593 for(req
= req_tbl
->next
; req
; req
= req_next
) {
594 req_next
= req
->next
;
595 if (so
== req
->udp_so
) {
596 temp_req
->next
= req_next
;
612 * Cu-SeeMe emulation.
613 * Hopefully the packet is more that 16 bytes long. We don't
614 * do any other tests, just replace the address and port
617 if (m
->m_len
>= sizeof (*cu_head
)) {
618 if (getsockname(so
->s
, (struct sockaddr
*)&addr
, &addrlen
) < 0)
620 cu_head
= mtod(m
, struct cu_header
*);
621 cu_head
->s_port
= addr
.sin_port
;
622 cu_head
->so_addr
= our_addr
.s_addr
;
630 udp_listen(u_int32_t haddr
, u_int hport
, u_int32_t laddr
, u_int lport
,
633 struct sockaddr_in addr
;
635 socklen_t addrlen
= sizeof(struct sockaddr_in
), opt
= 1;
637 if ((so
= socreate()) == NULL
) {
641 so
->s
= socket(AF_INET
,SOCK_DGRAM
,0);
642 so
->so_expire
= curtime
+ SO_EXPIRE
;
645 addr
.sin_family
= AF_INET
;
646 addr
.sin_addr
.s_addr
= haddr
;
647 addr
.sin_port
= hport
;
649 if (bind(so
->s
,(struct sockaddr
*)&addr
, addrlen
) < 0) {
653 setsockopt(so
->s
,SOL_SOCKET
,SO_REUSEADDR
,(char *)&opt
,sizeof(int));
654 /* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */
656 getsockname(so
->s
,(struct sockaddr
*)&addr
,&addrlen
);
657 so
->so_fport
= addr
.sin_port
;
658 if (addr
.sin_addr
.s_addr
== 0 ||
659 addr
.sin_addr
.s_addr
== loopback_addr
.s_addr
) {
660 so
->so_faddr
= vhost_addr
;
662 so
->so_faddr
= addr
.sin_addr
;
664 so
->so_lport
= lport
;
665 so
->so_laddr
.s_addr
= laddr
;
666 if (flags
!= SS_FACCEPTONCE
)
669 so
->so_state
&= SS_PERSISTENT_MASK
;
670 so
->so_state
|= SS_ISFCONNECTED
| flags
;