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1.1 cgd 1: /*
2: * Copyright (c) 1982, 1986, 1988, 1990 Regents of the University of California.
3: * 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: *
1.2 cgd 33: * from: @(#)udp_usrreq.c 7.20 (Berkeley) 4/20/91
1.12 ! mycroft 34: * $Id: udp_usrreq.c,v 1.11 1994/02/02 05:59:10 hpeyerl Exp $
1.1 cgd 35: */
36:
1.5 mycroft 37: #include <sys/param.h>
38: #include <sys/malloc.h>
39: #include <sys/mbuf.h>
40: #include <sys/protosw.h>
41: #include <sys/socket.h>
42: #include <sys/socketvar.h>
43: #include <sys/stat.h>
1.1 cgd 44:
1.5 mycroft 45: #include <net/if.h>
46: #include <net/route.h>
1.1 cgd 47:
1.5 mycroft 48: #include <netinet/in.h>
49: #include <netinet/in_systm.h>
50: #include <netinet/ip.h>
51: #include <netinet/in_pcb.h>
52: #include <netinet/ip_var.h>
53: #include <netinet/ip_icmp.h>
54: #include <netinet/udp.h>
55: #include <netinet/udp_var.h>
1.1 cgd 56:
1.8 mycroft 57: /*
58: * UDP protocol implementation.
59: * Per RFC 768, August, 1980.
60: */
61: #ifndef COMPAT_42
62: int udpcksum = 1;
63: #else
64: int udpcksum = 0; /* XXX */
65: #endif
66: int udp_ttl = UDP_TTL;
67:
68: struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
1.1 cgd 69: struct inpcb *udp_last_inpcb = &udb;
70:
1.7 mycroft 71: static void udp_detach __P((struct inpcb *));
72: static void udp_notify __P((struct inpcb *, int));
73: static struct mbuf *
74: udp_saveopt __P((caddr_t, int, int));
75:
76: void
1.1 cgd 77: udp_init()
78: {
79:
80: udb.inp_next = udb.inp_prev = &udb;
81: }
82:
1.7 mycroft 83: void
1.1 cgd 84: udp_input(m, iphlen)
85: register struct mbuf *m;
86: int iphlen;
87: {
88: register struct ip *ip;
89: register struct udphdr *uh;
90: register struct inpcb *inp;
91: struct mbuf *opts = 0;
92: int len;
93: struct ip save_ip;
94:
95: udpstat.udps_ipackets++;
96:
97: /*
98: * Strip IP options, if any; should skip this,
99: * make available to user, and use on returned packets,
100: * but we don't yet have a way to check the checksum
101: * with options still present.
102: */
103: if (iphlen > sizeof (struct ip)) {
104: ip_stripoptions(m, (struct mbuf *)0);
105: iphlen = sizeof(struct ip);
106: }
107:
108: /*
109: * Get IP and UDP header together in first mbuf.
110: */
111: ip = mtod(m, struct ip *);
112: if (m->m_len < iphlen + sizeof(struct udphdr)) {
113: if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
114: udpstat.udps_hdrops++;
115: return;
116: }
117: ip = mtod(m, struct ip *);
118: }
119: uh = (struct udphdr *)((caddr_t)ip + iphlen);
120:
121: /*
122: * Make mbuf data length reflect UDP length.
123: * If not enough data to reflect UDP length, drop.
124: */
125: len = ntohs((u_short)uh->uh_ulen);
126: if (ip->ip_len != len) {
127: if (len > ip->ip_len) {
128: udpstat.udps_badlen++;
129: goto bad;
130: }
131: m_adj(m, len - ip->ip_len);
132: /* ip->ip_len = len; */
133: }
134: /*
135: * Save a copy of the IP header in case we want restore it
136: * for sending an ICMP error message in response.
137: */
138: save_ip = *ip;
139:
140: /*
141: * Checksum extended UDP header and data.
142: */
143: if (udpcksum && uh->uh_sum) {
144: ((struct ipovly *)ip)->ih_next = 0;
145: ((struct ipovly *)ip)->ih_prev = 0;
146: ((struct ipovly *)ip)->ih_x1 = 0;
147: ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
148: if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
149: udpstat.udps_badsum++;
150: m_freem(m);
151: return;
152: }
153: }
1.4 hpeyerl 154: if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
155: in_broadcast(ip->ip_dst)) {
156: struct socket *last;
157: /*
158: * Deliver a multicast or broadcast datagram to *all* sockets
159: * for which the local and remote addresses and ports match
160: * those of the incoming datagram. This allows more than
161: * one process to receive multi/broadcasts on the same port.
162: * (This really ought to be done for unicast datagrams as
163: * well, but that would cause problems with existing
164: * applications that open both address-specific sockets and
165: * a wildcard socket listening to the same port -- they would
166: * end up receiving duplicates of every unicast datagram.
167: * Those applications open the multiple sockets to overcome an
168: * inadequacy of the UDP socket interface, but for backwards
169: * compatibility we avoid the problem here rather than
170: * fixing the interface. Maybe 4.4BSD will remedy this?)
171: */
172: /*
173: * Construct sockaddr format source address.
174: */
175: udp_in.sin_port = uh->uh_sport;
176: udp_in.sin_addr = ip->ip_src;
177: m->m_len -= sizeof (struct udpiphdr);
178: m->m_data += sizeof (struct udpiphdr);
179: /*
180: * Locate pcb(s) for datagram.
181: * (Algorithm copied from raw_intr().)
182: */
183: last = NULL;
184: for (inp = udb.inp_next; inp != &udb; inp = inp->inp_next) {
185: if (inp->inp_lport != uh->uh_dport)
186: continue;
187: if (inp->inp_laddr.s_addr != INADDR_ANY) {
188: if (inp->inp_laddr.s_addr !=
189: ip->ip_dst.s_addr)
190: continue;
191: }
192: if (inp->inp_faddr.s_addr != INADDR_ANY) {
1.6 mycroft 193: if (inp->inp_faddr.s_addr !=
1.4 hpeyerl 194: ip->ip_src.s_addr ||
195: inp->inp_fport != uh->uh_sport)
196: continue;
197: }
198:
199: if (last != NULL) {
200: struct mbuf *n;
201:
202: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
203: if (sbappendaddr(&last->so_rcv,
204: (struct sockaddr *)&udp_in,
205: n, (struct mbuf *)0) == 0)
206: m_freem(n);
207: else
208: sorwakeup(last);
209: }
210: }
211: last = inp->inp_socket;
212: /*
213: * Don't look for additional matches if this one
214: * does not have the SO_REUSEADDR socket option set.
215: * This heuristic avoids searching through all pcbs
216: * in the common case of a non-shared port. It
217: * assumes that an application will never clear
218: * the SO_REUSEADDR option after setting it.
219: */
220: if ((last->so_options & SO_REUSEADDR) == 0)
221: break;
222: }
1.6 mycroft 223:
1.4 hpeyerl 224: if (last == NULL) {
225: /*
226: * No matching pcb found; discard datagram.
227: * (No need to send an ICMP Port Unreachable
228: * for a broadcast or multicast datgram.)
229: */
230: goto bad;
231: }
232: if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&udp_in,
233: m, (struct mbuf *)0) == 0)
234: goto bad;
235: sorwakeup(last);
236: return;
237: }
1.1 cgd 238: /*
239: * Locate pcb for datagram.
240: */
241: inp = udp_last_inpcb;
242: if (inp->inp_lport != uh->uh_dport ||
243: inp->inp_fport != uh->uh_sport ||
244: inp->inp_faddr.s_addr != ip->ip_src.s_addr ||
245: inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
246: inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
247: ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
248: if (inp)
249: udp_last_inpcb = inp;
250: udpstat.udpps_pcbcachemiss++;
251: }
252: if (inp == 0) {
253: /* don't send ICMP response for broadcast packet */
254: udpstat.udps_noport++;
255: *ip = save_ip;
256: ip->ip_len += iphlen;
1.9 mycroft 257: {
258: register struct in_addr foo = {};
259: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, foo);
260: }
1.1 cgd 261: return;
262: }
263:
264: /*
265: * Construct sockaddr format source address.
266: * Stuff source address and datagram in user buffer.
267: */
268: udp_in.sin_port = uh->uh_sport;
269: udp_in.sin_addr = ip->ip_src;
270: if (inp->inp_flags & INP_CONTROLOPTS) {
271: struct mbuf **mp = &opts;
272:
273: if (inp->inp_flags & INP_RECVDSTADDR) {
274: *mp = udp_saveopt((caddr_t) &ip->ip_dst,
275: sizeof(struct in_addr), IP_RECVDSTADDR);
276: if (*mp)
277: mp = &(*mp)->m_next;
278: }
279: #ifdef notyet
280: /* options were tossed above */
281: if (inp->inp_flags & INP_RECVOPTS) {
282: *mp = udp_saveopt((caddr_t) opts_deleted_above,
283: sizeof(struct in_addr), IP_RECVOPTS);
284: if (*mp)
285: mp = &(*mp)->m_next;
286: }
287: /* ip_srcroute doesn't do what we want here, need to fix */
288: if (inp->inp_flags & INP_RECVRETOPTS) {
289: *mp = udp_saveopt((caddr_t) ip_srcroute(),
290: sizeof(struct in_addr), IP_RECVRETOPTS);
291: if (*mp)
292: mp = &(*mp)->m_next;
293: }
294: #endif
295: }
296: iphlen += sizeof(struct udphdr);
297: m->m_len -= iphlen;
298: m->m_pkthdr.len -= iphlen;
299: m->m_data += iphlen;
300: if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
301: m, opts) == 0) {
302: udpstat.udps_fullsock++;
303: goto bad;
304: }
305: sorwakeup(inp->inp_socket);
306: return;
307: bad:
308: m_freem(m);
309: if (opts)
310: m_freem(opts);
311: }
312:
313: /*
314: * Create a "control" mbuf containing the specified data
315: * with the specified type for presentation with a datagram.
316: */
1.7 mycroft 317: static struct mbuf *
1.1 cgd 318: udp_saveopt(p, size, type)
319: caddr_t p;
320: register int size;
321: int type;
322: {
323: register struct cmsghdr *cp;
324: struct mbuf *m;
325:
326: if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
327: return ((struct mbuf *) NULL);
328: cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
329: bcopy(p, (caddr_t)(cp + 1), size);
330: size += sizeof(*cp);
331: m->m_len = size;
332: cp->cmsg_len = size;
333: cp->cmsg_level = IPPROTO_IP;
334: cp->cmsg_type = type;
335: return (m);
336: }
337:
338: /*
339: * Notify a udp user of an asynchronous error;
340: * just wake up so that he can collect error status.
341: */
1.7 mycroft 342: static void
1.1 cgd 343: udp_notify(inp, errno)
344: register struct inpcb *inp;
1.7 mycroft 345: int errno;
1.1 cgd 346: {
347:
348: inp->inp_socket->so_error = errno;
349: sorwakeup(inp->inp_socket);
350: sowwakeup(inp->inp_socket);
351: }
352:
1.7 mycroft 353: void
1.1 cgd 354: udp_ctlinput(cmd, sa, ip)
355: int cmd;
356: struct sockaddr *sa;
357: register struct ip *ip;
358: {
359: register struct udphdr *uh;
360: extern struct in_addr zeroin_addr;
361: extern u_char inetctlerrmap[];
362:
363: if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0)
364: return;
365: if (ip) {
366: uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
367: in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
368: cmd, udp_notify);
369: } else
370: in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
371: }
372:
1.7 mycroft 373: int
1.1 cgd 374: udp_output(inp, m, addr, control)
375: register struct inpcb *inp;
376: register struct mbuf *m;
377: struct mbuf *addr, *control;
378: {
379: register struct udpiphdr *ui;
380: register int len = m->m_pkthdr.len;
381: struct in_addr laddr;
382: int s, error = 0;
383:
384: if (control)
385: m_freem(control); /* XXX */
386:
387: if (addr) {
388: laddr = inp->inp_laddr;
389: if (inp->inp_faddr.s_addr != INADDR_ANY) {
390: error = EISCONN;
391: goto release;
392: }
393: /*
394: * Must block input while temporarily connected.
395: */
396: s = splnet();
397: error = in_pcbconnect(inp, addr);
398: if (error) {
399: splx(s);
400: goto release;
401: }
402: } else {
403: if (inp->inp_faddr.s_addr == INADDR_ANY) {
404: error = ENOTCONN;
405: goto release;
406: }
407: }
408: /*
409: * Calculate data length and get a mbuf
410: * for UDP and IP headers.
411: */
412: M_PREPEND(m, sizeof(struct udpiphdr), M_WAIT);
413:
414: /*
415: * Fill in mbuf with extended UDP header
416: * and addresses and length put into network format.
417: */
418: ui = mtod(m, struct udpiphdr *);
419: ui->ui_next = ui->ui_prev = 0;
420: ui->ui_x1 = 0;
421: ui->ui_pr = IPPROTO_UDP;
422: ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
423: ui->ui_src = inp->inp_laddr;
424: ui->ui_dst = inp->inp_faddr;
425: ui->ui_sport = inp->inp_lport;
426: ui->ui_dport = inp->inp_fport;
427: ui->ui_ulen = ui->ui_len;
428:
429: /*
430: * Stuff checksum and output datagram.
431: */
432: ui->ui_sum = 0;
433: if (udpcksum) {
434: if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
435: ui->ui_sum = 0xffff;
436: }
437: ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
438: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
439: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
440: udpstat.udps_opackets++;
441: error = ip_output(m, inp->inp_options, &inp->inp_route,
1.12 ! mycroft 442: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
! 443: inp->inp_moptions);
1.1 cgd 444:
445: if (addr) {
446: in_pcbdisconnect(inp);
447: inp->inp_laddr = laddr;
448: splx(s);
449: }
450: return (error);
451:
452: release:
453: m_freem(m);
454: return (error);
455: }
456:
457: u_long udp_sendspace = 9216; /* really max datagram size */
458: u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
459: /* 40 1K datagrams */
460:
461: /*ARGSUSED*/
1.7 mycroft 462: int
1.1 cgd 463: udp_usrreq(so, req, m, addr, control)
464: struct socket *so;
465: int req;
466: struct mbuf *m, *addr, *control;
467: {
468: struct inpcb *inp = sotoinpcb(so);
469: int error = 0;
470: int s;
471:
472: if (req == PRU_CONTROL)
473: return (in_control(so, (int)m, (caddr_t)addr,
474: (struct ifnet *)control));
475: if (inp == NULL && req != PRU_ATTACH) {
476: error = EINVAL;
477: goto release;
478: }
479: /*
480: * Note: need to block udp_input while changing
481: * the udp pcb queue and/or pcb addresses.
482: */
483: switch (req) {
484:
485: case PRU_ATTACH:
486: if (inp != NULL) {
487: error = EINVAL;
488: break;
489: }
490: s = splnet();
491: error = in_pcballoc(so, &udb);
492: splx(s);
493: if (error)
494: break;
495: error = soreserve(so, udp_sendspace, udp_recvspace);
496: if (error)
497: break;
498: ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = udp_ttl;
499: break;
500:
501: case PRU_DETACH:
502: udp_detach(inp);
503: break;
504:
505: case PRU_BIND:
506: s = splnet();
507: error = in_pcbbind(inp, addr);
508: splx(s);
509: break;
510:
511: case PRU_LISTEN:
512: error = EOPNOTSUPP;
513: break;
514:
515: case PRU_CONNECT:
516: if (inp->inp_faddr.s_addr != INADDR_ANY) {
517: error = EISCONN;
518: break;
519: }
520: s = splnet();
521: error = in_pcbconnect(inp, addr);
522: splx(s);
523: if (error == 0)
524: soisconnected(so);
525: break;
526:
527: case PRU_CONNECT2:
528: error = EOPNOTSUPP;
529: break;
530:
531: case PRU_ACCEPT:
532: error = EOPNOTSUPP;
533: break;
534:
535: case PRU_DISCONNECT:
536: if (inp->inp_faddr.s_addr == INADDR_ANY) {
537: error = ENOTCONN;
538: break;
539: }
540: s = splnet();
541: in_pcbdisconnect(inp);
542: inp->inp_laddr.s_addr = INADDR_ANY;
543: splx(s);
544: so->so_state &= ~SS_ISCONNECTED; /* XXX */
545: break;
546:
547: case PRU_SHUTDOWN:
548: socantsendmore(so);
549: break;
550:
551: case PRU_SEND:
552: return (udp_output(inp, m, addr, control));
553:
554: case PRU_ABORT:
555: soisdisconnected(so);
556: udp_detach(inp);
557: break;
558:
559: case PRU_SOCKADDR:
560: in_setsockaddr(inp, addr);
561: break;
562:
563: case PRU_PEERADDR:
564: in_setpeeraddr(inp, addr);
565: break;
566:
567: case PRU_SENSE:
568: /*
569: * stat: don't bother with a blocksize.
570: */
571: return (0);
572:
573: case PRU_SENDOOB:
574: case PRU_FASTTIMO:
575: case PRU_SLOWTIMO:
576: case PRU_PROTORCV:
577: case PRU_PROTOSEND:
578: error = EOPNOTSUPP;
579: break;
580:
581: case PRU_RCVD:
582: case PRU_RCVOOB:
583: return (EOPNOTSUPP); /* do not free mbuf's */
584:
585: default:
586: panic("udp_usrreq");
587: }
588:
589: release:
590: if (control) {
591: printf("udp control data unexpectedly retained\n");
592: m_freem(control);
593: }
594: if (m)
595: m_freem(m);
596: return (error);
597: }
598:
1.7 mycroft 599: static void
1.1 cgd 600: udp_detach(inp)
601: struct inpcb *inp;
602: {
603: int s = splnet();
604:
605: if (inp == udp_last_inpcb)
606: udp_last_inpcb = &udb;
607: in_pcbdetach(inp);
608: splx(s);
609: }