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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. 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.
16: *
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
27: * SUCH DAMAGE.
28: *
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
31: */
32:
33: /*
34: * Changes and additions relating to SLiRP
35: * Copyright (c) 1995 Danny Gasparovski.
36: *
37: * Please read the file COPYRIGHT for the
38: * terms and conditions of the copyright.
39: */
40:
41: #include <stdlib.h>
42: #include <slirp.h>
43: #include "ip_icmp.h"
44:
45: struct udpstat udpstat;
46:
47: struct socket udb;
48:
49: /*
50: * UDP protocol implementation.
51: * Per RFC 768, August, 1980.
52: */
53: #ifndef COMPAT_42
54: int udpcksum = 1;
55: #else
56: int udpcksum = 0; /* XXX */
57: #endif
58:
59: struct socket *udp_last_so = &udb;
60:
61: void
62: udp_init()
63: {
64: udb.so_next = udb.so_prev = &udb;
65: }
66: /* m->m_data points at ip packet header
67: * m->m_len length ip packet
68: * ip->ip_len length data (IPDU)
69: */
70: void
71: udp_input(m, iphlen)
72: register struct mbuf *m;
73: int iphlen;
74: {
75: register struct ip *ip;
76: register struct udphdr *uh;
77: /* struct mbuf *opts = 0;*/
78: int len;
79: struct ip save_ip;
80: struct socket *so;
81:
82: DEBUG_CALL("udp_input");
83: DEBUG_ARG("m = %lx", (long)m);
84: DEBUG_ARG("iphlen = %d", iphlen);
85:
86: udpstat.udps_ipackets++;
87:
88: /*
89: * Strip IP options, if any; should skip this,
90: * make available to user, and use on returned packets,
91: * but we don't yet have a way to check the checksum
92: * with options still present.
93: */
94: if(iphlen > sizeof(struct ip)) {
95: ip_stripoptions(m, (struct mbuf *)0);
96: iphlen = sizeof(struct ip);
97: }
98:
99: /*
100: * Get IP and UDP header together in first mbuf.
101: */
102: ip = mtod(m, struct ip *);
103: uh = (struct udphdr *)((caddr_t)ip + iphlen);
104:
105: /*
106: * Make mbuf data length reflect UDP length.
107: * If not enough data to reflect UDP length, drop.
108: */
109: len = ntohs((u_int16_t)uh->uh_ulen);
110:
111: if (ip->ip_len != len) {
112: if (len > ip->ip_len) {
113: udpstat.udps_badlen++;
114: goto bad;
115: }
116: m_adj(m, len - ip->ip_len);
117: ip->ip_len = len;
118: }
119:
120: /*
121: * Save a copy of the IP header in case we want restore it
122: * for sending an ICMP error message in response.
123: */
124: save_ip = *ip;
125: save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
126:
127: /*
128: * Checksum extended UDP header and data.
129: */
130: if (udpcksum && uh->uh_sum) {
131: memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr));
132: ((struct ipovly *)ip)->ih_x1 = 0;
133: ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
134: /* keep uh_sum for ICMP reply
135: * uh->uh_sum = cksum(m, len + sizeof (struct ip));
136: * if (uh->uh_sum) {
137: */
138: if(cksum(m, len + sizeof(struct ip))) {
139: udpstat.udps_badsum++;
140: goto bad;
141: }
142: }
143:
144: /*
145: * handle DHCP/BOOTP
146: */
147: if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
148: bootp_input(m);
149: goto bad;
150: }
151:
152: /*
153: * handle TFTP
154: */
155: if (ntohs(uh->uh_dport) == TFTP_SERVER) {
156: tftp_input(m);
157: goto bad;
158: }
159:
160: /*
161: * Locate pcb for datagram.
162: */
163: so = udp_last_so;
164: if (so->so_lport != uh->uh_sport ||
165: so->so_laddr.s_addr != ip->ip_src.s_addr) {
166: struct socket *tmp;
167:
168: for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) {
169: if (tmp->so_lport == uh->uh_sport &&
170: tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
171: tmp->so_faddr.s_addr = ip->ip_dst.s_addr;
172: tmp->so_fport = uh->uh_dport;
173: so = tmp;
174: break;
175: }
176: }
177: if (tmp == &udb) {
178: so = NULL;
179: } else {
180: udpstat.udpps_pcbcachemiss++;
181: udp_last_so = so;
182: }
183: }
184:
185: if (so == NULL) {
186: /*
187: * If there's no socket for this packet,
188: * create one
189: */
190: if ((so = socreate()) == NULL) goto bad;
191: if(udp_attach(so) == -1) {
192: DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
193: errno,strerror(errno)));
194: sofree(so);
195: goto bad;
196: }
197:
198: /*
199: * Setup fields
200: */
201: /* udp_last_so = so; */
202: so->so_laddr = ip->ip_src;
203: so->so_lport = uh->uh_sport;
204:
205: if ((so->so_iptos = udp_tos(so)) == 0)
206: so->so_iptos = ip->ip_tos;
207:
208: /*
209: * XXXXX Here, check if it's in udpexec_list,
210: * and if it is, do the fork_exec() etc.
211: */
212: }
213:
214: so->so_faddr = ip->ip_dst; /* XXX */
215: so->so_fport = uh->uh_dport; /* XXX */
216:
217: iphlen += sizeof(struct udphdr);
218: m->m_len -= iphlen;
219: m->m_data += iphlen;
220:
221: /*
222: * Now we sendto() the packet.
223: */
224: if (so->so_emu)
225: udp_emu(so, m);
226:
227: if(sosendto(so,m) == -1) {
228: m->m_len += iphlen;
229: m->m_data -= iphlen;
230: *ip=save_ip;
231: DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
232: icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
233: }
234:
235: m_free(so->so_m); /* used for ICMP if error on sorecvfrom */
236:
237: /* restore the orig mbuf packet */
238: m->m_len += iphlen;
239: m->m_data -= iphlen;
240: *ip=save_ip;
241: so->so_m=m; /* ICMP backup */
242:
243: return;
244: bad:
245: m_freem(m);
246: /* if (opts) m_freem(opts); */
247: return;
248: }
249:
250: int udp_output2(struct socket *so, struct mbuf *m,
251: struct sockaddr_in *saddr, struct sockaddr_in *daddr,
252: int iptos)
253: {
254: register struct udpiphdr *ui;
255: int error = 0;
256:
257: DEBUG_CALL("udp_output");
258: DEBUG_ARG("so = %lx", (long)so);
259: DEBUG_ARG("m = %lx", (long)m);
260: DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
261: DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
262:
263: /*
264: * Adjust for header
265: */
266: m->m_data -= sizeof(struct udpiphdr);
267: m->m_len += sizeof(struct udpiphdr);
268:
269: /*
270: * Fill in mbuf with extended UDP header
271: * and addresses and length put into network format.
272: */
273: ui = mtod(m, struct udpiphdr *);
274: memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr));
275: ui->ui_x1 = 0;
276: ui->ui_pr = IPPROTO_UDP;
277: ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
278: /* XXXXX Check for from-one-location sockets, or from-any-location sockets */
279: ui->ui_src = saddr->sin_addr;
280: ui->ui_dst = daddr->sin_addr;
281: ui->ui_sport = saddr->sin_port;
282: ui->ui_dport = daddr->sin_port;
283: ui->ui_ulen = ui->ui_len;
284:
285: /*
286: * Stuff checksum and output datagram.
287: */
288: ui->ui_sum = 0;
289: if (udpcksum) {
290: if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
291: ui->ui_sum = 0xffff;
292: }
293: ((struct ip *)ui)->ip_len = m->m_len;
294:
295: ((struct ip *)ui)->ip_ttl = ip_defttl;
296: ((struct ip *)ui)->ip_tos = iptos;
297:
298: udpstat.udps_opackets++;
299:
300: error = ip_output(so, m);
301:
302: return (error);
303: }
304:
305: int udp_output(struct socket *so, struct mbuf *m,
306: struct sockaddr_in *addr)
307:
308: {
309: struct sockaddr_in saddr, daddr;
310:
311: saddr = *addr;
312: if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
313: saddr.sin_addr.s_addr = so->so_faddr.s_addr;
314: if ((so->so_faddr.s_addr & htonl(0x000000ff)) == htonl(0xff))
315: saddr.sin_addr.s_addr = alias_addr.s_addr;
316: }
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: memset(&addr, 0, sizeof(struct sockaddr_in));
336: addr.sin_family = AF_INET;
337: addr.sin_port = 0;
338: addr.sin_addr.s_addr = INADDR_ANY;
339: if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) {
340: int lasterrno=errno;
341: closesocket(so->s);
342: so->s=-1;
343: #ifdef _WIN32
344: WSASetLastError(lasterrno);
345: #else
346: errno=lasterrno;
347: #endif
348: } else {
349: /* success, insert in queue */
350: so->so_expire = curtime + SO_EXPIRE;
351: insque(so,&udb);
352: }
353: }
354: return(so->s);
355: }
356:
357: void
358: udp_detach(so)
359: struct socket *so;
360: {
361: closesocket(so->s);
362: /* if (so->so_m) m_free(so->so_m); done by sofree */
363:
364: sofree(so);
365: }
366:
367: struct tos_t udptos[] = {
368: {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
369: {517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */
370: {518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */
371: {0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */
372: {0, 0, 0, 0}
373: };
374:
375: u_int8_t
376: udp_tos(so)
377: struct socket *so;
378: {
379: int i = 0;
380:
381: while(udptos[i].tos) {
382: if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) ||
383: (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
384: so->so_emu = udptos[i].emu;
385: return udptos[i].tos;
386: }
387: i++;
388: }
389:
390: return 0;
391: }
392:
393: #ifdef EMULATE_TALK
394: #include "talkd.h"
395: #endif
396:
397: /*
398: * Here, talk/ytalk/ntalk requests must be emulated
399: */
400: void
401: udp_emu(so, m)
402: struct socket *so;
403: struct mbuf *m;
404: {
405: struct sockaddr_in addr;
406: socklen_t addrlen = sizeof(addr);
407: #ifdef EMULATE_TALK
408: CTL_MSG_OLD *omsg;
409: CTL_MSG *nmsg;
410: char buff[sizeof(CTL_MSG)];
411: u_char type;
412:
413: struct talk_request {
414: struct talk_request *next;
415: struct socket *udp_so;
416: struct socket *tcp_so;
417: } *req;
418:
419: static struct talk_request *req_tbl = 0;
420:
421: #endif
422:
423: struct cu_header {
424: uint16_t d_family; // destination family
425: uint16_t d_port; // destination port
426: uint32_t d_addr; // destination address
427: uint16_t s_family; // source family
428: uint16_t s_port; // source port
429: uint32_t so_addr; // source address
430: uint32_t seqn; // sequence number
431: uint16_t message; // message
432: uint16_t data_type; // data type
433: uint16_t pkt_len; // packet length
434: } *cu_head;
435:
436: switch(so->so_emu) {
437:
438: #ifdef EMULATE_TALK
439: case EMU_TALK:
440: case EMU_NTALK:
441: /*
442: * Talk emulation. We always change the ctl_addr to get
443: * some answers from the daemon. When an ANNOUNCE comes,
444: * we send LEAVE_INVITE to the local daemons. Also when a
445: * DELETE comes, we send copies to the local daemons.
446: */
447: if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
448: return;
449:
450: #define IS_OLD (so->so_emu == EMU_TALK)
451:
452: #define COPY_MSG(dest, src) { dest->type = src->type; \
453: dest->id_num = src->id_num; \
454: dest->pid = src->pid; \
455: dest->addr = src->addr; \
456: dest->ctl_addr = src->ctl_addr; \
457: memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
458: memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
459: memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); }
460:
461: #define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
462: /* old_sockaddr to sockaddr_in */
463:
464:
465: if (IS_OLD) { /* old talk */
466: omsg = mtod(m, CTL_MSG_OLD*);
467: nmsg = (CTL_MSG *) buff;
468: type = omsg->type;
469: OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
470: OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
471: strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
472: } else { /* new talk */
473: omsg = (CTL_MSG_OLD *) buff;
474: nmsg = mtod(m, CTL_MSG *);
475: type = nmsg->type;
476: OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
477: OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
478: strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
479: }
480:
481: if (type == LOOK_UP)
482: return; /* for LOOK_UP this is enough */
483:
484: if (IS_OLD) { /* make a copy of the message */
485: COPY_MSG(nmsg, omsg);
486: nmsg->vers = 1;
487: nmsg->answer = 0;
488: } else
489: COPY_MSG(omsg, nmsg);
490:
491: /*
492: * If if is an ANNOUNCE message, we go through the
493: * request table to see if a tcp port has already
494: * been redirected for this socket. If not, we solisten()
495: * a new socket and add this entry to the table.
496: * The port number of the tcp socket and our IP
497: * are put to the addr field of the message structures.
498: * Then a LEAVE_INVITE is sent to both local daemon
499: * ports, 517 and 518. This is why we have two copies
500: * of the message, one in old talk and one in new talk
501: * format.
502: */
503:
504: if (type == ANNOUNCE) {
505: int s;
506: u_short temp_port;
507:
508: for(req = req_tbl; req; req = req->next)
509: if (so == req->udp_so)
510: break; /* found it */
511:
512: if (!req) { /* no entry for so, create new */
513: req = (struct talk_request *)
514: malloc(sizeof(struct talk_request));
515: req->udp_so = so;
516: req->tcp_so = solisten(0,
517: OTOSIN(omsg, addr)->sin_addr.s_addr,
518: OTOSIN(omsg, addr)->sin_port,
519: SS_FACCEPTONCE);
520: req->next = req_tbl;
521: req_tbl = req;
522: }
523:
524: /* replace port number in addr field */
525: addrlen = sizeof(addr);
526: getsockname(req->tcp_so->s,
527: (struct sockaddr *) &addr,
528: &addrlen);
529: OTOSIN(omsg, addr)->sin_port = addr.sin_port;
530: OTOSIN(omsg, addr)->sin_addr = our_addr;
531: OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
532: OTOSIN(nmsg, addr)->sin_addr = our_addr;
533:
534: /* send LEAVE_INVITEs */
535: temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
536: OTOSIN(omsg, ctl_addr)->sin_port = 0;
537: OTOSIN(nmsg, ctl_addr)->sin_port = 0;
538: omsg->type = nmsg->type = LEAVE_INVITE;
539:
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));
549: closesocket(s) ;
550:
551: omsg->type = nmsg->type = ANNOUNCE;
552: OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
553: OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
554: }
555:
556: /*
557: * If it is a DELETE message, we send a copy to the
558: * local daemons. Then we delete the entry corresponding
559: * to our socket from the request table.
560: */
561:
562: if (type == DELETE) {
563: struct talk_request *temp_req, *req_next;
564: int s;
565: u_short temp_port;
566:
567: temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
568: OTOSIN(omsg, ctl_addr)->sin_port = 0;
569: OTOSIN(nmsg, ctl_addr)->sin_port = 0;
570:
571: s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
572: addr.sin_addr = our_addr;
573: addr.sin_family = AF_INET;
574: addr.sin_port = htons(517);
575: sendto(s, (char *)omsg, sizeof(*omsg), 0,
576: (struct sockaddr *)&addr, sizeof(addr));
577: addr.sin_port = htons(518);
578: sendto(s, (char *)nmsg, sizeof(*nmsg), 0,
579: (struct sockaddr *)&addr, sizeof(addr));
580: closesocket(s);
581:
582: OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
583: OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
584:
585: /* delete table entry */
586: if (so == req_tbl->udp_so) {
587: temp_req = req_tbl;
588: req_tbl = req_tbl->next;
589: free(temp_req);
590: } else {
591: temp_req = req_tbl;
592: for(req = req_tbl->next; req; req = req_next) {
593: req_next = req->next;
594: if (so == req->udp_so) {
595: temp_req->next = req_next;
596: free(req);
597: break;
598: } else {
599: temp_req = req;
600: }
601: }
602: }
603: }
604:
605: return;
606: #endif
607:
608: case EMU_CUSEEME:
609:
610: /*
611: * Cu-SeeMe emulation.
612: * Hopefully the packet is more that 16 bytes long. We don't
613: * do any other tests, just replace the address and port
614: * fields.
615: */
616: if (m->m_len >= sizeof (*cu_head)) {
617: if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
618: return;
619: cu_head = mtod(m, struct cu_header *);
620: cu_head->s_port = addr.sin_port;
621: cu_head->so_addr = our_addr.s_addr;
622: }
623:
624: return;
625: }
626: }
627:
628: struct socket *
629: udp_listen(port, laddr, lport, flags)
630: u_int port;
631: u_int32_t laddr;
632: u_int lport;
633: int flags;
634: {
635: struct sockaddr_in addr;
636: struct socket *so;
637: socklen_t addrlen = sizeof(struct sockaddr_in);
638: int opt = 1;
639:
640: if ((so = socreate()) == NULL) {
641: free(so);
642: return NULL;
643: }
644: so->s = socket(AF_INET,SOCK_DGRAM,0);
645: so->so_expire = curtime + SO_EXPIRE;
646: insque(so,&udb);
647:
648: memset(&addr, 0, sizeof(struct sockaddr_in));
649: addr.sin_family = AF_INET;
650: addr.sin_addr.s_addr = INADDR_ANY;
651: addr.sin_port = port;
652:
653: if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
654: udp_detach(so);
655: return NULL;
656: }
657: setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
658: /* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */
659:
660: getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
661: so->so_fport = addr.sin_port;
662: if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
663: so->so_faddr = alias_addr;
664: else
665: so->so_faddr = addr.sin_addr;
666:
667: so->so_lport = lport;
668: so->so_laddr.s_addr = laddr;
669: if (flags != SS_FACCEPTONCE)
670: so->so_expire = 0;
671:
672: so->so_state = SS_ISFCONNECTED;
673:
674: return so;
675: }
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