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
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13 * 3. All advertising materials mentioning features or use of this software
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15 * This product includes software developed by the University of
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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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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.
48 struct udpstat udpstat;
53 * UDP protocol implementation.
54 * Per RFC 768, August, 1980.
59 int udpcksum = 0; /* XXX */
62 struct socket *udp_last_so = &udb;
67 udb.so_next = udb.so_prev = &udb;
69 /* m->m_data points at ip packet header
70 * m->m_len length ip packet
71 * ip->ip_len length data (IPDU)
75 register struct mbuf *m;
78 register struct ip *ip;
79 register struct udphdr *uh;
80 /* struct mbuf *opts = 0;*/
85 DEBUG_CALL("udp_input");
86 DEBUG_ARG("m = %lx", (long)m);
87 DEBUG_ARG("iphlen = %d", iphlen);
89 udpstat.udps_ipackets++;
92 * Strip IP options, if any; should skip this,
93 * make available to user, and use on returned packets,
94 * but we don't yet have a way to check the checksum
95 * with options still present.
97 if(iphlen > sizeof(struct ip)) {
98 ip_stripoptions(m, (struct mbuf *)0);
99 iphlen = sizeof(struct ip);
103 * Get IP and UDP header together in first mbuf.
105 ip = mtod(m, struct ip *);
106 uh = (struct udphdr *)((caddr_t)ip + iphlen);
109 * Make mbuf data length reflect UDP length.
110 * If not enough data to reflect UDP length, drop.
112 len = ntohs((u_int16_t)uh->uh_ulen);
114 if (ip->ip_len != len) {
115 if (len > ip->ip_len) {
116 udpstat.udps_badlen++;
119 m_adj(m, len - ip->ip_len);
124 * Save a copy of the IP header in case we want restore it
125 * for sending an ICMP error message in response.
128 save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
131 * Checksum extended UDP header and data.
133 if (udpcksum && uh->uh_sum) {
134 ((struct ipovly *)ip)->ih_next = 0;
135 ((struct ipovly *)ip)->ih_prev = 0;
136 ((struct ipovly *)ip)->ih_x1 = 0;
137 ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
138 /* keep uh_sum for ICMP reply
139 * uh->uh_sum = cksum(m, len + sizeof (struct ip));
142 if(cksum(m, len + sizeof(struct ip))) {
143 udpstat.udps_badsum++;
151 if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
159 if (ntohs(uh->uh_dport) == TFTP_SERVER) {
165 * Locate pcb for datagram.
168 if (so->so_lport != uh->uh_sport ||
169 so->so_laddr.s_addr != ip->ip_src.s_addr) {
172 for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) {
173 if (tmp->so_lport == uh->uh_sport &&
174 tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
175 tmp->so_faddr.s_addr = ip->ip_dst.s_addr;
176 tmp->so_fport = uh->uh_dport;
184 udpstat.udpps_pcbcachemiss++;
191 * If there's no socket for this packet,
194 if ((so = socreate()) == NULL) goto bad;
195 if(udp_attach(so) == -1) {
196 DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
197 errno,strerror(errno)));
205 /* udp_last_so = so; */
206 so->so_laddr = ip->ip_src;
207 so->so_lport = uh->uh_sport;
208 so->so_faddr = ip->ip_dst; /* XXX */
209 so->so_fport = uh->uh_dport; /* XXX */
211 if ((so->so_iptos = udp_tos(so)) == 0)
212 so->so_iptos = ip->ip_tos;
215 * XXXXX Here, check if it's in udpexec_list,
216 * and if it is, do the fork_exec() etc.
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 ui->ui_next = ui->ui_prev = 0;
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 = ip_defttl;
299 ((struct ip *)ui)->ip_tos = iptos;
301 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 & htonl(0xffffff00)) == special_addr.s_addr)
316 saddr.sin_addr.s_addr = so->so_faddr.s_addr;
317 daddr.sin_addr = so->so_laddr;
318 daddr.sin_port = so->so_lport;
320 return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
327 struct sockaddr_in addr;
329 if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) {
331 * Here, we bind() the socket. Although not really needed
332 * (sendto() on an unbound socket will bind it), it's done
333 * here so that emulation of ytalk etc. don't have to do it
335 addr.sin_family = AF_INET;
337 addr.sin_addr.s_addr = INADDR_ANY;
338 if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) {
343 WSASetLastError(lasterrno);
348 /* success, insert in queue */
349 so->so_expire = curtime + SO_EXPIRE;
361 /* if (so->so_m) m_free(so->so_m); done by sofree */
366 struct tos_t udptos[] = {
367 {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
368 {517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */
369 {518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */
370 {0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */
380 while(udptos[i].tos) {
381 if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) ||
382 (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
383 so->so_emu = udptos[i].emu;
384 return udptos[i].tos;
397 * Here, talk/ytalk/ntalk requests must be emulated
404 struct sockaddr_in addr;
405 int addrlen = sizeof(addr);
409 char buff[sizeof(CTL_MSG)];
412 struct talk_request {
413 struct talk_request *next;
414 struct socket *udp_so;
415 struct socket *tcp_so;
418 static struct talk_request *req_tbl = 0;
423 uint16_t d_family; // destination family
424 uint16_t d_port; // destination port
425 uint32_t d_addr; // destination address
426 uint16_t s_family; // source family
427 uint16_t s_port; // source port
428 uint32_t so_addr; // source address
429 uint32_t seqn; // sequence number
430 uint16_t message; // message
431 uint16_t data_type; // data type
432 uint16_t pkt_len; // packet length
441 * Talk emulation. We always change the ctl_addr to get
442 * some answers from the daemon. When an ANNOUNCE comes,
443 * we send LEAVE_INVITE to the local daemons. Also when a
444 * DELETE comes, we send copies to the local daemons.
446 if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
449 #define IS_OLD (so->so_emu == EMU_TALK)
451 #define COPY_MSG(dest, src) { dest->type = src->type; \
452 dest->id_num = src->id_num; \
453 dest->pid = src->pid; \
454 dest->addr = src->addr; \
455 dest->ctl_addr = src->ctl_addr; \
456 memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
457 memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
458 memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); }
460 #define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
461 /* old_sockaddr to sockaddr_in */
464 if (IS_OLD) { /* old talk */
465 omsg = mtod(m, CTL_MSG_OLD*);
466 nmsg = (CTL_MSG *) buff;
468 OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
469 OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
470 strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
471 } else { /* new talk */
472 omsg = (CTL_MSG_OLD *) buff;
473 nmsg = mtod(m, CTL_MSG *);
475 OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
476 OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
477 strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
481 return; /* for LOOK_UP this is enough */
483 if (IS_OLD) { /* make a copy of the message */
484 COPY_MSG(nmsg, omsg);
488 COPY_MSG(omsg, nmsg);
491 * If if is an ANNOUNCE message, we go through the
492 * request table to see if a tcp port has already
493 * been redirected for this socket. If not, we solisten()
494 * a new socket and add this entry to the table.
495 * The port number of the tcp socket and our IP
496 * are put to the addr field of the message structures.
497 * Then a LEAVE_INVITE is sent to both local daemon
498 * ports, 517 and 518. This is why we have two copies
499 * of the message, one in old talk and one in new talk
503 if (type == ANNOUNCE) {
507 for(req = req_tbl; req; req = req->next)
508 if (so == req->udp_so)
509 break; /* found it */
511 if (!req) { /* no entry for so, create new */
512 req = (struct talk_request *)
513 malloc(sizeof(struct talk_request));
515 req->tcp_so = solisten(0,
516 OTOSIN(omsg, addr)->sin_addr.s_addr,
517 OTOSIN(omsg, addr)->sin_port,
523 /* replace port number in addr field */
524 addrlen = sizeof(addr);
525 getsockname(req->tcp_so->s,
526 (struct sockaddr *) &addr,
528 OTOSIN(omsg, addr)->sin_port = addr.sin_port;
529 OTOSIN(omsg, addr)->sin_addr = our_addr;
530 OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
531 OTOSIN(nmsg, addr)->sin_addr = our_addr;
533 /* send LEAVE_INVITEs */
534 temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
535 OTOSIN(omsg, ctl_addr)->sin_port = 0;
536 OTOSIN(nmsg, ctl_addr)->sin_port = 0;
537 omsg->type = nmsg->type = LEAVE_INVITE;
539 s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
540 addr.sin_addr = our_addr;
541 addr.sin_family = AF_INET;
542 addr.sin_port = htons(517);
543 sendto(s, (char *)omsg, sizeof(*omsg), 0,
544 (struct sockaddr *)&addr, sizeof(addr));
545 addr.sin_port = htons(518);
546 sendto(s, (char *)nmsg, sizeof(*nmsg), 0,
547 (struct sockaddr *) &addr, sizeof(addr));
550 omsg->type = nmsg->type = ANNOUNCE;
551 OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
552 OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
556 * If it is a DELETE message, we send a copy to the
557 * local daemons. Then we delete the entry corresponding
558 * to our socket from the request table.
561 if (type == DELETE) {
562 struct talk_request *temp_req, *req_next;
566 temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
567 OTOSIN(omsg, ctl_addr)->sin_port = 0;
568 OTOSIN(nmsg, ctl_addr)->sin_port = 0;
570 s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
571 addr.sin_addr = our_addr;
572 addr.sin_family = AF_INET;
573 addr.sin_port = htons(517);
574 sendto(s, (char *)omsg, sizeof(*omsg), 0,
575 (struct sockaddr *)&addr, sizeof(addr));
576 addr.sin_port = htons(518);
577 sendto(s, (char *)nmsg, sizeof(*nmsg), 0,
578 (struct sockaddr *)&addr, sizeof(addr));
581 OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
582 OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
584 /* delete table entry */
585 if (so == req_tbl->udp_so) {
587 req_tbl = req_tbl->next;
591 for(req = req_tbl->next; req; req = req_next) {
592 req_next = req->next;
593 if (so == req->udp_so) {
594 temp_req->next = req_next;
610 * Cu-SeeMe emulation.
611 * Hopefully the packet is more that 16 bytes long. We don't
612 * do any other tests, just replace the address and port
615 if (m->m_len >= sizeof (*cu_head)) {
616 if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
618 cu_head = mtod(m, struct cu_header *);
619 cu_head->s_port = addr.sin_port;
620 cu_head->so_addr = our_addr.s_addr;
628 udp_listen(port, laddr, lport, flags)
634 struct sockaddr_in addr;
636 int addrlen = sizeof(struct sockaddr_in), opt = 1;
638 if ((so = socreate()) == NULL) {
642 so->s = socket(AF_INET,SOCK_DGRAM,0);
643 so->so_expire = curtime + SO_EXPIRE;
646 addr.sin_family = AF_INET;
647 addr.sin_addr.s_addr = INADDR_ANY;
648 addr.sin_port = port;
650 if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
654 setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
655 /* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */
657 getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
658 so->so_fport = addr.sin_port;
659 if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
660 so->so_faddr = our_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_ISFCONNECTED;