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1.1 root 1: /*
2: * Copyright (c) 1982, 1986, 1988, 1990, 1993
3: * The Regents of the University of California. All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
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.
20: *
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
31: * SUCH DAMAGE.
32: *
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
35: */
36:
37: /*
38: * Changes and additions relating to SLiRP
39: * Copyright (c) 1995 Danny Gasparovski.
40: *
41: * Please read the file COPYRIGHT for the
42: * terms and conditions of the copyright.
43: */
44:
45: #include <slirp.h>
46: #include "ip_icmp.h"
47:
48: struct udpstat udpstat;
49:
50: struct socket udb;
51:
52: /*
53: * UDP protocol implementation.
54: * Per RFC 768, August, 1980.
55: */
56: #ifndef COMPAT_42
57: int udpcksum = 1;
58: #else
59: int udpcksum = 0; /* XXX */
60: #endif
61:
62: struct socket *udp_last_so = &udb;
63:
64: void
65: udp_init()
66: {
67: udb.so_next = udb.so_prev = &udb;
68: }
69: /* m->m_data points at ip packet header
70: * m->m_len length ip packet
71: * ip->ip_len length data (IPDU)
72: */
73: void
74: udp_input(m, iphlen)
75: register struct mbuf *m;
76: int iphlen;
77: {
78: register struct ip *ip;
79: register struct udphdr *uh;
80: /* struct mbuf *opts = 0;*/
81: int len;
82: struct ip save_ip;
83: struct socket *so;
84:
85: DEBUG_CALL("udp_input");
86: DEBUG_ARG("m = %lx", (long)m);
87: DEBUG_ARG("iphlen = %d", iphlen);
88:
89: udpstat.udps_ipackets++;
90:
91: /*
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.
96: */
97: if(iphlen > sizeof(struct ip)) {
98: ip_stripoptions(m, (struct mbuf *)0);
99: iphlen = sizeof(struct ip);
100: }
101:
102: /*
103: * Get IP and UDP header together in first mbuf.
104: */
105: ip = mtod(m, struct ip *);
106: uh = (struct udphdr *)((caddr_t)ip + iphlen);
107:
108: /*
109: * Make mbuf data length reflect UDP length.
110: * If not enough data to reflect UDP length, drop.
111: */
112: len = ntohs((u_int16_t)uh->uh_ulen);
113:
114: if (ip->ip_len != len) {
115: if (len > ip->ip_len) {
116: udpstat.udps_badlen++;
117: goto bad;
118: }
119: m_adj(m, len - ip->ip_len);
120: ip->ip_len = len;
121: }
122:
123: /*
124: * Save a copy of the IP header in case we want restore it
125: * for sending an ICMP error message in response.
126: */
127: save_ip = *ip;
128: save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
129:
130: /*
131: * Checksum extended UDP header and data.
132: */
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));
140: * if (uh->uh_sum) {
141: */
142: if(cksum(m, len + sizeof(struct ip))) {
143: udpstat.udps_badsum++;
144: goto bad;
145: }
146: }
147:
148: /*
149: * handle DHCP/BOOTP
150: */
151: if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
152: bootp_input(m);
153: goto bad;
154: }
155:
156: /*
157: * handle TFTP
158: */
159: if (ntohs(uh->uh_dport) == TFTP_SERVER) {
160: tftp_input(m);
161: goto bad;
162: }
163:
164: /*
165: * Locate pcb for datagram.
166: */
167: so = udp_last_so;
168: if (so->so_lport != uh->uh_sport ||
169: so->so_laddr.s_addr != ip->ip_src.s_addr) {
170: struct socket *tmp;
171:
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;
177: so = tmp;
178: break;
179: }
180: }
181: if (tmp == &udb) {
182: so = NULL;
183: } else {
184: udpstat.udpps_pcbcachemiss++;
185: udp_last_so = so;
186: }
187: }
188:
189: if (so == NULL) {
190: /*
191: * If there's no socket for this packet,
192: * create one
193: */
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)));
198: sofree(so);
199: goto bad;
200: }
201:
202: /*
203: * Setup fields
204: */
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 */
210:
211: if ((so->so_iptos = udp_tos(so)) == 0)
212: so->so_iptos = ip->ip_tos;
213:
214: /*
215: * XXXXX Here, check if it's in udpexec_list,
216: * and if it is, do the fork_exec() etc.
217: */
218: }
219:
220: iphlen += sizeof(struct udphdr);
221: m->m_len -= iphlen;
222: m->m_data += iphlen;
223:
224: /*
225: * Now we sendto() the packet.
226: */
227: if (so->so_emu)
228: udp_emu(so, m);
229:
230: if(sosendto(so,m) == -1) {
231: m->m_len += iphlen;
232: m->m_data -= iphlen;
233: *ip=save_ip;
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));
236: }
237:
238: m_free(so->so_m); /* used for ICMP if error on sorecvfrom */
239:
240: /* restore the orig mbuf packet */
241: m->m_len += iphlen;
242: m->m_data -= iphlen;
243: *ip=save_ip;
244: so->so_m=m; /* ICMP backup */
245:
246: return;
247: bad:
248: m_freem(m);
249: /* if (opts) m_freem(opts); */
250: return;
251: }
252:
253: int udp_output2(struct socket *so, struct mbuf *m,
254: struct sockaddr_in *saddr, struct sockaddr_in *daddr,
255: int iptos)
256: {
257: register struct udpiphdr *ui;
258: int error = 0;
259:
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);
265:
266: /*
267: * Adjust for header
268: */
269: m->m_data -= sizeof(struct udpiphdr);
270: m->m_len += sizeof(struct udpiphdr);
271:
272: /*
273: * Fill in mbuf with extended UDP header
274: * and addresses and length put into network format.
275: */
276: ui = mtod(m, struct udpiphdr *);
277: ui->ui_next = ui->ui_prev = 0;
278: ui->ui_x1 = 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;
287:
288: /*
289: * Stuff checksum and output datagram.
290: */
291: ui->ui_sum = 0;
292: if (udpcksum) {
293: if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
294: ui->ui_sum = 0xffff;
295: }
296: ((struct ip *)ui)->ip_len = m->m_len;
297:
298: ((struct ip *)ui)->ip_ttl = ip_defttl;
299: ((struct ip *)ui)->ip_tos = iptos;
300:
301: udpstat.udps_opackets++;
302:
303: error = ip_output(so, m);
304:
305: return (error);
306: }
307:
308: int udp_output(struct socket *so, struct mbuf *m,
309: struct sockaddr_in *addr)
310:
311: {
312: struct sockaddr_in saddr, daddr;
313:
314: saddr = *addr;
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;
319:
320: return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
321: }
322:
323: int
324: udp_attach(so)
325: struct socket *so;
326: {
327: struct sockaddr_in addr;
328:
329: if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) {
330: /*
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
334: */
335: addr.sin_family = AF_INET;
336: addr.sin_port = 0;
337: addr.sin_addr.s_addr = INADDR_ANY;
338: if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) {
339: int lasterrno=errno;
340: closesocket(so->s);
341: so->s=-1;
342: #ifdef _WIN32
343: WSASetLastError(lasterrno);
344: #else
345: errno=lasterrno;
346: #endif
347: } else {
348: /* success, insert in queue */
349: so->so_expire = curtime + SO_EXPIRE;
350: insque(so,&udb);
351: }
352: }
353: return(so->s);
354: }
355:
356: void
357: udp_detach(so)
358: struct socket *so;
359: {
360: closesocket(so->s);
361: /* if (so->so_m) m_free(so->so_m); done by sofree */
362:
363: sofree(so);
364: }
365:
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 */
371: {0, 0, 0, 0}
372: };
373:
374: u_int8_t
375: udp_tos(so)
376: struct socket *so;
377: {
378: int i = 0;
379:
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;
385: }
386: i++;
387: }
388:
389: return 0;
390: }
391:
392: #ifdef EMULATE_TALK
393: #include "talkd.h"
394: #endif
395:
396: /*
397: * Here, talk/ytalk/ntalk requests must be emulated
398: */
399: void
400: udp_emu(so, m)
401: struct socket *so;
402: struct mbuf *m;
403: {
404: struct sockaddr_in addr;
405: int addrlen = sizeof(addr);
406: #ifdef EMULATE_TALK
407: CTL_MSG_OLD *omsg;
408: CTL_MSG *nmsg;
409: char buff[sizeof(CTL_MSG)];
410: u_char type;
411:
412: struct talk_request {
413: struct talk_request *next;
414: struct socket *udp_so;
415: struct socket *tcp_so;
416: } *req;
417:
418: static struct talk_request *req_tbl = 0;
419:
420: #endif
421:
422: struct cu_header {
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
433: } *cu_head;
434:
435: switch(so->so_emu) {
436:
437: #ifdef EMULATE_TALK
438: case EMU_TALK:
439: case EMU_NTALK:
440: /*
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.
445: */
446: if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
447: return;
448:
449: #define IS_OLD (so->so_emu == EMU_TALK)
450:
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); }
459:
460: #define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
461: /* old_sockaddr to sockaddr_in */
462:
463:
464: if (IS_OLD) { /* old talk */
465: omsg = mtod(m, CTL_MSG_OLD*);
466: nmsg = (CTL_MSG *) buff;
467: type = omsg->type;
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 *);
474: type = nmsg->type;
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);
478: }
479:
480: if (type == LOOK_UP)
481: return; /* for LOOK_UP this is enough */
482:
483: if (IS_OLD) { /* make a copy of the message */
484: COPY_MSG(nmsg, omsg);
485: nmsg->vers = 1;
486: nmsg->answer = 0;
487: } else
488: COPY_MSG(omsg, nmsg);
489:
490: /*
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
500: * format.
501: */
502:
503: if (type == ANNOUNCE) {
504: int s;
505: u_short temp_port;
506:
507: for(req = req_tbl; req; req = req->next)
508: if (so == req->udp_so)
509: break; /* found it */
510:
511: if (!req) { /* no entry for so, create new */
512: req = (struct talk_request *)
513: malloc(sizeof(struct talk_request));
514: req->udp_so = so;
515: req->tcp_so = solisten(0,
516: OTOSIN(omsg, addr)->sin_addr.s_addr,
517: OTOSIN(omsg, addr)->sin_port,
518: SS_FACCEPTONCE);
519: req->next = req_tbl;
520: req_tbl = req;
521: }
522:
523: /* replace port number in addr field */
524: addrlen = sizeof(addr);
525: getsockname(req->tcp_so->s,
526: (struct sockaddr *) &addr,
527: &addrlen);
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;
532:
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;
538:
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));
548: closesocket(s) ;
549:
550: omsg->type = nmsg->type = ANNOUNCE;
551: OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
552: OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
553: }
554:
555: /*
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.
559: */
560:
561: if (type == DELETE) {
562: struct talk_request *temp_req, *req_next;
563: int s;
564: u_short temp_port;
565:
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;
569:
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));
579: closesocket(s);
580:
581: OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
582: OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
583:
584: /* delete table entry */
585: if (so == req_tbl->udp_so) {
586: temp_req = req_tbl;
587: req_tbl = req_tbl->next;
588: free(temp_req);
589: } else {
590: temp_req = req_tbl;
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;
595: free(req);
596: break;
597: } else {
598: temp_req = req;
599: }
600: }
601: }
602: }
603:
604: return;
605: #endif
606:
607: case EMU_CUSEEME:
608:
609: /*
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
613: * fields.
614: */
615: if (m->m_len >= sizeof (*cu_head)) {
616: if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
617: return;
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;
621: }
622:
623: return;
624: }
625: }
626:
627: struct socket *
628: udp_listen(port, laddr, lport, flags)
629: u_int port;
630: u_int32_t laddr;
631: u_int lport;
632: int flags;
633: {
634: struct sockaddr_in addr;
635: struct socket *so;
636: int addrlen = sizeof(struct sockaddr_in), opt = 1;
637:
638: if ((so = socreate()) == NULL) {
639: free(so);
640: return NULL;
641: }
642: so->s = socket(AF_INET,SOCK_DGRAM,0);
643: so->so_expire = curtime + SO_EXPIRE;
644: insque(so,&udb);
645:
646: addr.sin_family = AF_INET;
647: addr.sin_addr.s_addr = INADDR_ANY;
648: addr.sin_port = port;
649:
650: if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
651: udp_detach(so);
652: return NULL;
653: }
654: setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
655: /* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */
656:
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)
1.1.1.2 ! root 660: so->so_faddr = alias_addr;
1.1 root 661: else
662: so->so_faddr = addr.sin_addr;
663:
664: so->so_lport = lport;
665: so->so_laddr.s_addr = laddr;
666: if (flags != SS_FACCEPTONCE)
667: so->so_expire = 0;
668:
669: so->so_state = SS_ISFCONNECTED;
670:
671: return so;
672: }
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