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1.14 ! cgd 1: /* $NetBSD$ */
! 2:
1.1 cgd 3: /*
1.13 mycroft 4: * Copyright (c) 1982, 1986, 1988, 1990, 1993
5: * The Regents of the University of California. All rights reserved.
1.1 cgd 6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: *
1.14 ! cgd 35: * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
1.1 cgd 36: */
37:
1.5 mycroft 38: #include <sys/param.h>
39: #include <sys/malloc.h>
40: #include <sys/mbuf.h>
41: #include <sys/protosw.h>
42: #include <sys/socket.h>
43: #include <sys/socketvar.h>
1.13 mycroft 44: #include <sys/errno.h>
1.5 mycroft 45: #include <sys/stat.h>
1.1 cgd 46:
1.5 mycroft 47: #include <net/if.h>
48: #include <net/route.h>
1.1 cgd 49:
1.5 mycroft 50: #include <netinet/in.h>
51: #include <netinet/in_systm.h>
52: #include <netinet/ip.h>
53: #include <netinet/in_pcb.h>
54: #include <netinet/ip_var.h>
55: #include <netinet/ip_icmp.h>
56: #include <netinet/udp.h>
57: #include <netinet/udp_var.h>
1.1 cgd 58:
1.8 mycroft 59: /*
60: * UDP protocol implementation.
61: * Per RFC 768, August, 1980.
62: */
63: #ifndef COMPAT_42
64: int udpcksum = 1;
65: #else
66: int udpcksum = 0; /* XXX */
67: #endif
68:
69: struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
1.1 cgd 70: struct inpcb *udp_last_inpcb = &udb;
71:
1.13 mycroft 72: static void udp_detach __P((struct inpcb *));
73: static void udp_notify __P((struct inpcb *, int));
74: static struct mbuf *udp_saveopt __P((caddr_t, int, int));
1.7 mycroft 75:
76: void
1.1 cgd 77: udp_init()
78: {
79: udb.inp_next = udb.inp_prev = &udb;
80: }
81:
1.7 mycroft 82: void
1.1 cgd 83: udp_input(m, iphlen)
84: register struct mbuf *m;
85: int iphlen;
86: {
87: register struct ip *ip;
88: register struct udphdr *uh;
89: register struct inpcb *inp;
90: struct mbuf *opts = 0;
91: int len;
92: struct ip save_ip;
93:
94: udpstat.udps_ipackets++;
95:
96: /*
97: * Strip IP options, if any; should skip this,
98: * make available to user, and use on returned packets,
99: * but we don't yet have a way to check the checksum
100: * with options still present.
101: */
102: if (iphlen > sizeof (struct ip)) {
103: ip_stripoptions(m, (struct mbuf *)0);
104: iphlen = sizeof(struct ip);
105: }
106:
107: /*
108: * Get IP and UDP header together in first mbuf.
109: */
110: ip = mtod(m, struct ip *);
111: if (m->m_len < iphlen + sizeof(struct udphdr)) {
112: if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
113: udpstat.udps_hdrops++;
114: return;
115: }
116: ip = mtod(m, struct ip *);
117: }
118: uh = (struct udphdr *)((caddr_t)ip + iphlen);
119:
120: /*
121: * Make mbuf data length reflect UDP length.
122: * If not enough data to reflect UDP length, drop.
123: */
124: len = ntohs((u_short)uh->uh_ulen);
125: if (ip->ip_len != len) {
126: if (len > ip->ip_len) {
127: udpstat.udps_badlen++;
128: goto bad;
129: }
130: m_adj(m, len - ip->ip_len);
131: /* ip->ip_len = len; */
132: }
133: /*
134: * Save a copy of the IP header in case we want restore it
135: * for sending an ICMP error message in response.
136: */
137: save_ip = *ip;
138:
139: /*
140: * Checksum extended UDP header and data.
141: */
142: if (udpcksum && uh->uh_sum) {
143: ((struct ipovly *)ip)->ih_next = 0;
144: ((struct ipovly *)ip)->ih_prev = 0;
145: ((struct ipovly *)ip)->ih_x1 = 0;
146: ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
147: if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
148: udpstat.udps_badsum++;
149: m_freem(m);
150: return;
151: }
152: }
1.13 mycroft 153:
1.4 hpeyerl 154: if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
1.13 mycroft 155: in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
1.4 hpeyerl 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
1.13 mycroft 170: * fixing the interface. Maybe 4.5BSD will remedy this?)
1.4 hpeyerl 171: */
1.13 mycroft 172:
1.4 hpeyerl 173: /*
174: * Construct sockaddr format source address.
175: */
176: udp_in.sin_port = uh->uh_sport;
177: udp_in.sin_addr = ip->ip_src;
178: m->m_len -= sizeof (struct udpiphdr);
179: m->m_data += sizeof (struct udpiphdr);
180: /*
181: * Locate pcb(s) for datagram.
182: * (Algorithm copied from raw_intr().)
183: */
184: last = NULL;
185: for (inp = udb.inp_next; inp != &udb; inp = inp->inp_next) {
186: if (inp->inp_lport != uh->uh_dport)
187: continue;
188: if (inp->inp_laddr.s_addr != INADDR_ANY) {
189: if (inp->inp_laddr.s_addr !=
190: ip->ip_dst.s_addr)
191: continue;
192: }
193: if (inp->inp_faddr.s_addr != INADDR_ANY) {
1.6 mycroft 194: if (inp->inp_faddr.s_addr !=
1.4 hpeyerl 195: ip->ip_src.s_addr ||
196: inp->inp_fport != uh->uh_sport)
197: continue;
198: }
199:
200: if (last != NULL) {
201: struct mbuf *n;
202:
203: if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
204: if (sbappendaddr(&last->so_rcv,
205: (struct sockaddr *)&udp_in,
1.13 mycroft 206: n, (struct mbuf *)0) == 0) {
1.4 hpeyerl 207: m_freem(n);
1.13 mycroft 208: udpstat.udps_fullsock++;
209: } else
1.4 hpeyerl 210: sorwakeup(last);
211: }
212: }
213: last = inp->inp_socket;
214: /*
1.13 mycroft 215: * Don't look for additional matches if this one does
216: * not have either the SO_REUSEPORT or SO_REUSEADDR
217: * socket options set. This heuristic avoids searching
218: * through all pcbs in the common case of a non-shared
219: * port. It * assumes that an application will never
220: * clear these options after setting them.
1.4 hpeyerl 221: */
1.13 mycroft 222: if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR) == 0))
1.4 hpeyerl 223: break;
224: }
1.6 mycroft 225:
1.4 hpeyerl 226: if (last == NULL) {
227: /*
228: * No matching pcb found; discard datagram.
229: * (No need to send an ICMP Port Unreachable
230: * for a broadcast or multicast datgram.)
231: */
1.13 mycroft 232: udpstat.udps_noportbcast++;
1.4 hpeyerl 233: goto bad;
234: }
235: if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&udp_in,
1.13 mycroft 236: m, (struct mbuf *)0) == 0) {
237: udpstat.udps_fullsock++;
1.4 hpeyerl 238: goto bad;
1.13 mycroft 239: }
1.4 hpeyerl 240: sorwakeup(last);
241: return;
242: }
1.1 cgd 243: /*
244: * Locate pcb for datagram.
245: */
246: inp = udp_last_inpcb;
247: if (inp->inp_lport != uh->uh_dport ||
248: inp->inp_fport != uh->uh_sport ||
249: inp->inp_faddr.s_addr != ip->ip_src.s_addr ||
250: inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
251: inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
252: ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
253: if (inp)
254: udp_last_inpcb = inp;
255: udpstat.udpps_pcbcachemiss++;
256: }
257: if (inp == 0) {
258: udpstat.udps_noport++;
1.13 mycroft 259: if (m->m_flags & (M_BCAST | M_MCAST)) {
260: udpstat.udps_noportbcast++;
261: goto bad;
262: }
1.1 cgd 263: *ip = save_ip;
264: ip->ip_len += iphlen;
1.13 mycroft 265: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
1.1 cgd 266: return;
267: }
268:
269: /*
270: * Construct sockaddr format source address.
271: * Stuff source address and datagram in user buffer.
272: */
273: udp_in.sin_port = uh->uh_sport;
274: udp_in.sin_addr = ip->ip_src;
275: if (inp->inp_flags & INP_CONTROLOPTS) {
276: struct mbuf **mp = &opts;
277:
278: if (inp->inp_flags & INP_RECVDSTADDR) {
279: *mp = udp_saveopt((caddr_t) &ip->ip_dst,
280: sizeof(struct in_addr), IP_RECVDSTADDR);
281: if (*mp)
282: mp = &(*mp)->m_next;
283: }
284: #ifdef notyet
285: /* options were tossed above */
286: if (inp->inp_flags & INP_RECVOPTS) {
287: *mp = udp_saveopt((caddr_t) opts_deleted_above,
288: sizeof(struct in_addr), IP_RECVOPTS);
289: if (*mp)
290: mp = &(*mp)->m_next;
291: }
292: /* ip_srcroute doesn't do what we want here, need to fix */
293: if (inp->inp_flags & INP_RECVRETOPTS) {
294: *mp = udp_saveopt((caddr_t) ip_srcroute(),
295: sizeof(struct in_addr), IP_RECVRETOPTS);
296: if (*mp)
297: mp = &(*mp)->m_next;
298: }
299: #endif
300: }
301: iphlen += sizeof(struct udphdr);
302: m->m_len -= iphlen;
303: m->m_pkthdr.len -= iphlen;
304: m->m_data += iphlen;
305: if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
306: m, opts) == 0) {
307: udpstat.udps_fullsock++;
308: goto bad;
309: }
310: sorwakeup(inp->inp_socket);
311: return;
312: bad:
313: m_freem(m);
314: if (opts)
315: m_freem(opts);
316: }
317:
318: /*
319: * Create a "control" mbuf containing the specified data
320: * with the specified type for presentation with a datagram.
321: */
1.13 mycroft 322: struct mbuf *
1.1 cgd 323: udp_saveopt(p, size, type)
324: caddr_t p;
325: register int size;
326: int type;
327: {
328: register struct cmsghdr *cp;
329: struct mbuf *m;
330:
331: if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
332: return ((struct mbuf *) NULL);
333: cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
1.13 mycroft 334: bcopy(p, CMSG_DATA(cp), size);
1.1 cgd 335: size += sizeof(*cp);
336: m->m_len = size;
337: cp->cmsg_len = size;
338: cp->cmsg_level = IPPROTO_IP;
339: cp->cmsg_type = type;
340: return (m);
341: }
342:
343: /*
344: * Notify a udp user of an asynchronous error;
345: * just wake up so that he can collect error status.
346: */
1.7 mycroft 347: static void
1.1 cgd 348: udp_notify(inp, errno)
349: register struct inpcb *inp;
1.7 mycroft 350: int errno;
1.1 cgd 351: {
352: inp->inp_socket->so_error = errno;
353: sorwakeup(inp->inp_socket);
354: sowwakeup(inp->inp_socket);
355: }
356:
1.7 mycroft 357: void
1.1 cgd 358: udp_ctlinput(cmd, sa, ip)
359: int cmd;
360: struct sockaddr *sa;
361: register struct ip *ip;
362: {
363: register struct udphdr *uh;
364: extern struct in_addr zeroin_addr;
365: extern u_char inetctlerrmap[];
366:
1.13 mycroft 367: if (!PRC_IS_REDIRECT(cmd) &&
368: ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0))
1.1 cgd 369: return;
370: if (ip) {
371: uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
372: in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
373: cmd, udp_notify);
374: } else
375: in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
376: }
377:
1.7 mycroft 378: int
1.1 cgd 379: udp_output(inp, m, addr, control)
380: register struct inpcb *inp;
381: register struct mbuf *m;
382: struct mbuf *addr, *control;
383: {
384: register struct udpiphdr *ui;
385: register int len = m->m_pkthdr.len;
386: struct in_addr laddr;
387: int s, error = 0;
388:
389: if (control)
390: m_freem(control); /* XXX */
391:
392: if (addr) {
393: laddr = inp->inp_laddr;
394: if (inp->inp_faddr.s_addr != INADDR_ANY) {
395: error = EISCONN;
396: goto release;
397: }
398: /*
399: * Must block input while temporarily connected.
400: */
401: s = splnet();
402: error = in_pcbconnect(inp, addr);
403: if (error) {
404: splx(s);
405: goto release;
406: }
407: } else {
408: if (inp->inp_faddr.s_addr == INADDR_ANY) {
409: error = ENOTCONN;
410: goto release;
411: }
412: }
413: /*
414: * Calculate data length and get a mbuf
415: * for UDP and IP headers.
416: */
1.13 mycroft 417: M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
418: if (m == 0) {
419: error = ENOBUFS;
420: goto release;
421: }
1.1 cgd 422:
423: /*
424: * Fill in mbuf with extended UDP header
425: * and addresses and length put into network format.
426: */
427: ui = mtod(m, struct udpiphdr *);
428: ui->ui_next = ui->ui_prev = 0;
429: ui->ui_x1 = 0;
430: ui->ui_pr = IPPROTO_UDP;
431: ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
432: ui->ui_src = inp->inp_laddr;
433: ui->ui_dst = inp->inp_faddr;
434: ui->ui_sport = inp->inp_lport;
435: ui->ui_dport = inp->inp_fport;
436: ui->ui_ulen = ui->ui_len;
437:
438: /*
439: * Stuff checksum and output datagram.
440: */
441: ui->ui_sum = 0;
442: if (udpcksum) {
443: if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
444: ui->ui_sum = 0xffff;
445: }
446: ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
447: ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
448: ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
449: udpstat.udps_opackets++;
450: error = ip_output(m, inp->inp_options, &inp->inp_route,
1.12 mycroft 451: inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
452: inp->inp_moptions);
1.1 cgd 453:
454: if (addr) {
455: in_pcbdisconnect(inp);
456: inp->inp_laddr = laddr;
457: splx(s);
458: }
459: return (error);
460:
461: release:
462: m_freem(m);
463: return (error);
464: }
465:
466: u_long udp_sendspace = 9216; /* really max datagram size */
467: u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
468: /* 40 1K datagrams */
469:
470: /*ARGSUSED*/
1.7 mycroft 471: int
1.1 cgd 472: udp_usrreq(so, req, m, addr, control)
473: struct socket *so;
474: int req;
475: struct mbuf *m, *addr, *control;
476: {
477: struct inpcb *inp = sotoinpcb(so);
478: int error = 0;
479: int s;
480:
481: if (req == PRU_CONTROL)
482: return (in_control(so, (int)m, (caddr_t)addr,
483: (struct ifnet *)control));
484: if (inp == NULL && req != PRU_ATTACH) {
485: error = EINVAL;
486: goto release;
487: }
488: /*
489: * Note: need to block udp_input while changing
490: * the udp pcb queue and/or pcb addresses.
491: */
492: switch (req) {
493:
494: case PRU_ATTACH:
495: if (inp != NULL) {
496: error = EINVAL;
497: break;
498: }
499: s = splnet();
500: error = in_pcballoc(so, &udb);
501: splx(s);
502: if (error)
503: break;
504: error = soreserve(so, udp_sendspace, udp_recvspace);
505: if (error)
506: break;
1.13 mycroft 507: ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = ip_defttl;
1.1 cgd 508: break;
509:
510: case PRU_DETACH:
511: udp_detach(inp);
512: break;
513:
514: case PRU_BIND:
515: s = splnet();
516: error = in_pcbbind(inp, addr);
517: splx(s);
518: break;
519:
520: case PRU_LISTEN:
521: error = EOPNOTSUPP;
522: break;
523:
524: case PRU_CONNECT:
525: if (inp->inp_faddr.s_addr != INADDR_ANY) {
526: error = EISCONN;
527: break;
528: }
529: s = splnet();
530: error = in_pcbconnect(inp, addr);
531: splx(s);
532: if (error == 0)
533: soisconnected(so);
534: break;
535:
536: case PRU_CONNECT2:
537: error = EOPNOTSUPP;
538: break;
539:
540: case PRU_ACCEPT:
541: error = EOPNOTSUPP;
542: break;
543:
544: case PRU_DISCONNECT:
545: if (inp->inp_faddr.s_addr == INADDR_ANY) {
546: error = ENOTCONN;
547: break;
548: }
549: s = splnet();
550: in_pcbdisconnect(inp);
551: inp->inp_laddr.s_addr = INADDR_ANY;
552: splx(s);
553: so->so_state &= ~SS_ISCONNECTED; /* XXX */
554: break;
555:
556: case PRU_SHUTDOWN:
557: socantsendmore(so);
558: break;
559:
560: case PRU_SEND:
561: return (udp_output(inp, m, addr, control));
562:
563: case PRU_ABORT:
564: soisdisconnected(so);
565: udp_detach(inp);
566: break;
567:
568: case PRU_SOCKADDR:
569: in_setsockaddr(inp, addr);
570: break;
571:
572: case PRU_PEERADDR:
573: in_setpeeraddr(inp, addr);
574: break;
575:
576: case PRU_SENSE:
577: /*
578: * stat: don't bother with a blocksize.
579: */
580: return (0);
581:
582: case PRU_SENDOOB:
583: case PRU_FASTTIMO:
584: case PRU_SLOWTIMO:
585: case PRU_PROTORCV:
586: case PRU_PROTOSEND:
587: error = EOPNOTSUPP;
588: break;
589:
590: case PRU_RCVD:
591: case PRU_RCVOOB:
592: return (EOPNOTSUPP); /* do not free mbuf's */
593:
594: default:
595: panic("udp_usrreq");
596: }
597:
598: release:
599: if (control) {
600: printf("udp control data unexpectedly retained\n");
601: m_freem(control);
602: }
603: if (m)
604: m_freem(m);
605: return (error);
606: }
607:
1.7 mycroft 608: static void
1.1 cgd 609: udp_detach(inp)
610: struct inpcb *inp;
611: {
612: int s = splnet();
613:
614: if (inp == udp_last_inpcb)
615: udp_last_inpcb = &udb;
616: in_pcbdetach(inp);
617: splx(s);
1.13 mycroft 618: }
619:
620: /*
621: * Sysctl for udp variables.
622: */
623: udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
624: int *name;
625: u_int namelen;
626: void *oldp;
627: size_t *oldlenp;
628: void *newp;
629: size_t newlen;
630: {
631: /* All sysctl names at this level are terminal. */
632: if (namelen != 1)
633: return (ENOTDIR);
634:
635: switch (name[0]) {
636: case UDPCTL_CHECKSUM:
637: return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
638: default:
639: return (ENOPROTOOPT);
640: }
641: /* NOTREACHED */
1.1 cgd 642: }