Annotation of src/sys/netinet/ip_input.c, Revision 1.33
1.33 ! mrg 1: /* $NetBSD: ip_input.c,v 1.32 1996/08/14 03:46:44 thorpej Exp $ */
1.14 cgd 2:
1.1 cgd 3: /*
1.13 mycroft 4: * Copyright (c) 1982, 1986, 1988, 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: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
1.1 cgd 36: */
37:
1.5 mycroft 38: #include <sys/param.h>
39: #include <sys/systm.h>
40: #include <sys/malloc.h>
41: #include <sys/mbuf.h>
42: #include <sys/domain.h>
43: #include <sys/protosw.h>
44: #include <sys/socket.h>
45: #include <sys/errno.h>
46: #include <sys/time.h>
47: #include <sys/kernel.h>
1.28 christos 48: #include <sys/proc.h>
49:
50: #include <vm/vm.h>
51: #include <sys/sysctl.h>
1.1 cgd 52:
1.5 mycroft 53: #include <net/if.h>
54: #include <net/route.h>
1.1 cgd 55:
1.5 mycroft 56: #include <netinet/in.h>
57: #include <netinet/in_systm.h>
58: #include <netinet/ip.h>
59: #include <netinet/in_pcb.h>
60: #include <netinet/in_var.h>
61: #include <netinet/ip_var.h>
62: #include <netinet/ip_icmp.h>
1.1 cgd 63:
64: #ifndef IPFORWARDING
65: #ifdef GATEWAY
66: #define IPFORWARDING 1 /* forward IP packets not for us */
67: #else /* GATEWAY */
68: #define IPFORWARDING 0 /* don't forward IP packets not for us */
69: #endif /* GATEWAY */
70: #endif /* IPFORWARDING */
71: #ifndef IPSENDREDIRECTS
72: #define IPSENDREDIRECTS 1
73: #endif
1.26 thorpej 74: #ifndef IPFORWSRCRT
75: #define IPFORWSRCRT 1 /* allow source-routed packets */
76: #endif
1.27 thorpej 77: /*
78: * Note: DIRECTED_BROADCAST is handled this way so that previous
79: * configuration using this option will Just Work.
80: */
81: #ifndef IPDIRECTEDBCAST
82: #ifdef DIRECTED_BROADCAST
83: #define IPDIRECTEDBCAST 1
84: #else
85: #define IPDIRECTEDBCAST 0
86: #endif /* DIRECTED_BROADCAST */
87: #endif /* IPDIRECTEDBCAST */
1.1 cgd 88: int ipforwarding = IPFORWARDING;
89: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 90: int ip_defttl = IPDEFTTL;
1.26 thorpej 91: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 92: int ip_directedbcast = IPDIRECTEDBCAST;
1.1 cgd 93: #ifdef DIAGNOSTIC
94: int ipprintfs = 0;
95: #endif
96:
97: extern struct domain inetdomain;
98: extern struct protosw inetsw[];
99: u_char ip_protox[IPPROTO_MAX];
100: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 101: struct in_ifaddrhead in_ifaddr;
1.13 mycroft 102: struct ifqueue ipintrq;
1.1 cgd 103:
104: /*
105: * We need to save the IP options in case a protocol wants to respond
106: * to an incoming packet over the same route if the packet got here
107: * using IP source routing. This allows connection establishment and
108: * maintenance when the remote end is on a network that is not known
109: * to us.
110: */
111: int ip_nhops = 0;
112: static struct ip_srcrt {
113: struct in_addr dst; /* final destination */
114: char nop; /* one NOP to align */
115: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
116: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
117: } ip_srcrt;
118:
1.13 mycroft 119: static void save_rte __P((u_char *, struct in_addr));
1.1 cgd 120: /*
121: * IP initialization: fill in IP protocol switch table.
122: * All protocols not implemented in kernel go to raw IP protocol handler.
123: */
1.8 mycroft 124: void
1.1 cgd 125: ip_init()
126: {
127: register struct protosw *pr;
128: register int i;
129:
130: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
131: if (pr == 0)
132: panic("ip_init");
133: for (i = 0; i < IPPROTO_MAX; i++)
134: ip_protox[i] = pr - inetsw;
135: for (pr = inetdomain.dom_protosw;
136: pr < inetdomain.dom_protoswNPROTOSW; pr++)
137: if (pr->pr_domain->dom_family == PF_INET &&
138: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
139: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 140: LIST_INIT(&ipq);
1.1 cgd 141: ip_id = time.tv_sec & 0xffff;
142: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 143: TAILQ_INIT(&in_ifaddr);
1.1 cgd 144: }
145:
146: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
147: struct route ipforward_rt;
148:
149: /*
150: * Ip input routine. Checksum and byte swap header. If fragmented
151: * try to reassemble. Process options. Pass to next level.
152: */
1.8 mycroft 153: void
1.1 cgd 154: ipintr()
155: {
1.33 ! mrg 156: register struct ip *ip = NULL;
1.1 cgd 157: register struct mbuf *m;
158: register struct ipq *fp;
159: register struct in_ifaddr *ia;
1.25 cgd 160: struct ipqent *ipqe;
1.33 ! mrg 161: int hlen = 0, mff, s;
! 162: #ifdef PACKET_FILTER
! 163: struct packet_filter_hook *pfh;
! 164: struct mbuf *m0;
! 165: #endif /* PACKET_FILTER */
1.1 cgd 166:
167: next:
168: /*
169: * Get next datagram off input queue and get IP header
170: * in first mbuf.
171: */
172: s = splimp();
173: IF_DEQUEUE(&ipintrq, m);
174: splx(s);
1.13 mycroft 175: if (m == 0)
1.1 cgd 176: return;
177: #ifdef DIAGNOSTIC
178: if ((m->m_flags & M_PKTHDR) == 0)
179: panic("ipintr no HDR");
180: #endif
181: /*
182: * If no IP addresses have been set yet but the interfaces
183: * are receiving, can't do anything with incoming packets yet.
184: */
1.22 mycroft 185: if (in_ifaddr.tqh_first == 0)
1.1 cgd 186: goto bad;
187: ipstat.ips_total++;
188: if (m->m_len < sizeof (struct ip) &&
189: (m = m_pullup(m, sizeof (struct ip))) == 0) {
190: ipstat.ips_toosmall++;
191: goto next;
192: }
193: ip = mtod(m, struct ip *);
1.13 mycroft 194: if (ip->ip_v != IPVERSION) {
195: ipstat.ips_badvers++;
196: goto bad;
197: }
1.1 cgd 198: hlen = ip->ip_hl << 2;
199: if (hlen < sizeof(struct ip)) { /* minimum header length */
200: ipstat.ips_badhlen++;
201: goto bad;
202: }
203: if (hlen > m->m_len) {
204: if ((m = m_pullup(m, hlen)) == 0) {
205: ipstat.ips_badhlen++;
206: goto next;
207: }
208: ip = mtod(m, struct ip *);
209: }
1.28 christos 210: if ((ip->ip_sum = in_cksum(m, hlen)) != 0) {
1.1 cgd 211: ipstat.ips_badsum++;
212: goto bad;
213: }
214:
215: /*
216: * Convert fields to host representation.
217: */
218: NTOHS(ip->ip_len);
219: if (ip->ip_len < hlen) {
220: ipstat.ips_badlen++;
221: goto bad;
222: }
223: NTOHS(ip->ip_id);
224: NTOHS(ip->ip_off);
225:
226: /*
227: * Check that the amount of data in the buffers
228: * is as at least much as the IP header would have us expect.
229: * Trim mbufs if longer than we expect.
230: * Drop packet if shorter than we expect.
231: */
232: if (m->m_pkthdr.len < ip->ip_len) {
233: ipstat.ips_tooshort++;
234: goto bad;
235: }
236: if (m->m_pkthdr.len > ip->ip_len) {
237: if (m->m_len == m->m_pkthdr.len) {
238: m->m_len = ip->ip_len;
239: m->m_pkthdr.len = ip->ip_len;
240: } else
241: m_adj(m, ip->ip_len - m->m_pkthdr.len);
242: }
243:
1.33 ! mrg 244: #ifdef PACKET_FILTER
! 245: /*
! 246: * Run through list of hooks for input packets.
! 247: */
! 248: m0 = m;
! 249: for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.le_next)
! 250: if (pfh->pfil_func) {
! 251: if (pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0))
! 252: goto bad;
! 253: ip = mtod(m = m0, struct ip *);
! 254: }
! 255: #endif /* PACKET_FILTER */
! 256:
1.1 cgd 257: /*
258: * Process options and, if not destined for us,
259: * ship it on. ip_dooptions returns 1 when an
260: * error was detected (causing an icmp message
261: * to be sent and the original packet to be freed).
262: */
263: ip_nhops = 0; /* for source routed packets */
264: if (hlen > sizeof (struct ip) && ip_dooptions(m))
265: goto next;
266:
267: /*
268: * Check our list of addresses, to see if the packet is for us.
269: */
1.22 mycroft 270: for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) {
1.20 mycroft 271: if (ip->ip_dst.s_addr == ia->ia_addr.sin_addr.s_addr)
1.1 cgd 272: goto ours;
1.27 thorpej 273: if (((ip_directedbcast == 0) || (ip_directedbcast &&
274: ia->ia_ifp == m->m_pkthdr.rcvif)) &&
1.1 cgd 275: (ia->ia_ifp->if_flags & IFF_BROADCAST)) {
1.20 mycroft 276: if (ip->ip_dst.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
277: ip->ip_dst.s_addr == ia->ia_netbroadcast.s_addr ||
278: /*
279: * Look for all-0's host part (old broadcast addr),
280: * either for subnet or net.
281: */
282: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 283: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 284: goto ours;
285: }
286: }
1.18 mycroft 287: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 288: struct in_multi *inm;
289: #ifdef MROUTING
290: extern struct socket *ip_mrouter;
1.10 brezak 291:
292: if (m->m_flags & M_EXT) {
293: if ((m = m_pullup(m, hlen)) == 0) {
294: ipstat.ips_toosmall++;
295: goto next;
296: }
297: ip = mtod(m, struct ip *);
298: }
1.4 hpeyerl 299:
300: if (ip_mrouter) {
301: /*
302: * If we are acting as a multicast router, all
303: * incoming multicast packets are passed to the
304: * kernel-level multicast forwarding function.
305: * The packet is returned (relatively) intact; if
306: * ip_mforward() returns a non-zero value, the packet
307: * must be discarded, else it may be accepted below.
308: *
309: * (The IP ident field is put in the same byte order
310: * as expected when ip_mforward() is called from
311: * ip_output().)
312: */
313: ip->ip_id = htons(ip->ip_id);
1.13 mycroft 314: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
315: ipstat.ips_cantforward++;
1.4 hpeyerl 316: m_freem(m);
317: goto next;
318: }
319: ip->ip_id = ntohs(ip->ip_id);
320:
321: /*
322: * The process-level routing demon needs to receive
323: * all multicast IGMP packets, whether or not this
324: * host belongs to their destination groups.
325: */
326: if (ip->ip_p == IPPROTO_IGMP)
327: goto ours;
1.13 mycroft 328: ipstat.ips_forward++;
1.4 hpeyerl 329: }
330: #endif
331: /*
332: * See if we belong to the destination multicast group on the
333: * arrival interface.
334: */
335: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
336: if (inm == NULL) {
1.13 mycroft 337: ipstat.ips_cantforward++;
1.4 hpeyerl 338: m_freem(m);
339: goto next;
340: }
341: goto ours;
342: }
1.19 mycroft 343: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
344: ip->ip_dst.s_addr == INADDR_ANY)
1.1 cgd 345: goto ours;
346:
347: /*
348: * Not for us; forward if possible and desirable.
349: */
350: if (ipforwarding == 0) {
351: ipstat.ips_cantforward++;
352: m_freem(m);
353: } else
354: ip_forward(m, 0);
355: goto next;
356:
357: ours:
358: /*
359: * If offset or IP_MF are set, must reassemble.
360: * Otherwise, nothing need be done.
361: * (We could look in the reassembly queue to see
362: * if the packet was previously fragmented,
363: * but it's not worth the time; just let them time out.)
364: */
365: if (ip->ip_off &~ IP_DF) {
366: if (m->m_flags & M_EXT) { /* XXX */
367: if ((m = m_pullup(m, sizeof (struct ip))) == 0) {
368: ipstat.ips_toosmall++;
369: goto next;
370: }
371: ip = mtod(m, struct ip *);
372: }
373: /*
374: * Look for queue of fragments
375: * of this datagram.
376: */
1.25 cgd 377: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 378: if (ip->ip_id == fp->ipq_id &&
379: ip->ip_src.s_addr == fp->ipq_src.s_addr &&
380: ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
381: ip->ip_p == fp->ipq_p)
382: goto found;
383: fp = 0;
384: found:
385:
386: /*
387: * Adjust ip_len to not reflect header,
1.25 cgd 388: * set ipqe_mff if more fragments are expected,
1.1 cgd 389: * convert offset of this to bytes.
390: */
391: ip->ip_len -= hlen;
1.25 cgd 392: mff = (ip->ip_off & IP_MF) != 0;
393: if (mff) {
1.16 cgd 394: /*
395: * Make sure that fragments have a data length
396: * that's a non-zero multiple of 8 bytes.
397: */
1.17 cgd 398: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 399: ipstat.ips_badfrags++;
400: goto bad;
401: }
402: }
1.1 cgd 403: ip->ip_off <<= 3;
404:
405: /*
406: * If datagram marked as having more fragments
407: * or if this is not the first fragment,
408: * attempt reassembly; if it succeeds, proceed.
409: */
1.25 cgd 410: if (mff || ip->ip_off) {
1.1 cgd 411: ipstat.ips_fragments++;
1.25 cgd 412: MALLOC(ipqe, struct ipqent *, sizeof (struct ipqent),
413: M_IPQ, M_NOWAIT);
414: if (ipqe == NULL) {
415: ipstat.ips_rcvmemdrop++;
416: goto bad;
417: }
418: ipqe->ipqe_mff = mff;
419: ipqe->ipqe_ip = ip;
420: ip = ip_reass(ipqe, fp);
1.1 cgd 421: if (ip == 0)
422: goto next;
1.13 mycroft 423: ipstat.ips_reassembled++;
1.1 cgd 424: m = dtom(ip);
425: } else
426: if (fp)
427: ip_freef(fp);
428: } else
429: ip->ip_len -= hlen;
430:
431: /*
432: * Switch out to protocol's input routine.
433: */
434: ipstat.ips_delivered++;
435: (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
436: goto next;
437: bad:
1.33 ! mrg 438: #ifdef PACKET_FILTER
! 439: m0 = m;
! 440: for (pfh = pfil_hook_get(PFIL_BAD); pfh; pfh = pfh->pfil_link.le_next)
! 441: if (pfh->pfil_func) {
! 442: (void)pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 2, &m0);
! 443: ip = mtod(m = m0, struct ip *);
! 444: }
! 445: #endif /* PACKET_FILTER */
1.1 cgd 446: m_freem(m);
447: goto next;
448: }
449:
450: /*
451: * Take incoming datagram fragment and try to
452: * reassemble it into whole datagram. If a chain for
453: * reassembly of this datagram already exists, then it
454: * is given as fp; otherwise have to make a chain.
455: */
456: struct ip *
1.25 cgd 457: ip_reass(ipqe, fp)
458: register struct ipqent *ipqe;
1.1 cgd 459: register struct ipq *fp;
460: {
1.25 cgd 461: register struct mbuf *m = dtom(ipqe->ipqe_ip);
462: register struct ipqent *nq, *p, *q;
463: struct ip *ip;
1.1 cgd 464: struct mbuf *t;
1.25 cgd 465: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 466: int i, next;
467:
468: /*
469: * Presence of header sizes in mbufs
470: * would confuse code below.
471: */
472: m->m_data += hlen;
473: m->m_len -= hlen;
474:
475: /*
476: * If first fragment to arrive, create a reassembly queue.
477: */
478: if (fp == 0) {
479: if ((t = m_get(M_DONTWAIT, MT_FTABLE)) == NULL)
480: goto dropfrag;
481: fp = mtod(t, struct ipq *);
1.25 cgd 482: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 483: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 484: fp->ipq_p = ipqe->ipqe_ip->ip_p;
485: fp->ipq_id = ipqe->ipqe_ip->ip_id;
486: LIST_INIT(&fp->ipq_fragq);
487: fp->ipq_src = ipqe->ipqe_ip->ip_src;
488: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
489: p = NULL;
1.1 cgd 490: goto insert;
491: }
492:
493: /*
494: * Find a segment which begins after this one does.
495: */
1.25 cgd 496: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
497: p = q, q = q->ipqe_q.le_next)
498: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 499: break;
500:
501: /*
502: * If there is a preceding segment, it may provide some of
503: * our data already. If so, drop the data from the incoming
504: * segment. If it provides all of our data, drop us.
505: */
1.25 cgd 506: if (p != NULL) {
507: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
508: ipqe->ipqe_ip->ip_off;
1.1 cgd 509: if (i > 0) {
1.25 cgd 510: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 511: goto dropfrag;
1.25 cgd 512: m_adj(dtom(ipqe->ipqe_ip), i);
513: ipqe->ipqe_ip->ip_off += i;
514: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 515: }
516: }
517:
518: /*
519: * While we overlap succeeding segments trim them or,
520: * if they are completely covered, dequeue them.
521: */
1.25 cgd 522: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
523: q->ipqe_ip->ip_off; q = nq) {
524: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
525: q->ipqe_ip->ip_off;
526: if (i < q->ipqe_ip->ip_len) {
527: q->ipqe_ip->ip_len -= i;
528: q->ipqe_ip->ip_off += i;
529: m_adj(dtom(q->ipqe_ip), i);
1.1 cgd 530: break;
531: }
1.25 cgd 532: nq = q->ipqe_q.le_next;
533: m_freem(dtom(q->ipqe_ip));
534: LIST_REMOVE(q, ipqe_q);
535: FREE(q, M_IPQ);
1.1 cgd 536: }
537:
538: insert:
539: /*
540: * Stick new segment in its place;
541: * check for complete reassembly.
542: */
1.25 cgd 543: if (p == NULL) {
544: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
545: } else {
546: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
547: }
1.1 cgd 548: next = 0;
1.25 cgd 549: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
550: p = q, q = q->ipqe_q.le_next) {
551: if (q->ipqe_ip->ip_off != next)
1.1 cgd 552: return (0);
1.25 cgd 553: next += q->ipqe_ip->ip_len;
1.1 cgd 554: }
1.25 cgd 555: if (p->ipqe_mff)
1.1 cgd 556: return (0);
557:
558: /*
559: * Reassembly is complete; concatenate fragments.
560: */
1.25 cgd 561: q = fp->ipq_fragq.lh_first;
562: ip = q->ipqe_ip;
563: m = dtom(q->ipqe_ip);
1.1 cgd 564: t = m->m_next;
565: m->m_next = 0;
566: m_cat(m, t);
1.25 cgd 567: nq = q->ipqe_q.le_next;
568: FREE(q, M_IPQ);
569: for (q = nq; q != NULL; q = nq) {
570: t = dtom(q->ipqe_ip);
571: nq = q->ipqe_q.le_next;
572: FREE(q, M_IPQ);
1.1 cgd 573: m_cat(m, t);
574: }
575:
576: /*
577: * Create header for new ip packet by
578: * modifying header of first packet;
579: * dequeue and discard fragment reassembly header.
580: * Make header visible.
581: */
582: ip->ip_len = next;
1.25 cgd 583: ip->ip_src = fp->ipq_src;
584: ip->ip_dst = fp->ipq_dst;
585: LIST_REMOVE(fp, ipq_q);
1.1 cgd 586: (void) m_free(dtom(fp));
587: m->m_len += (ip->ip_hl << 2);
588: m->m_data -= (ip->ip_hl << 2);
589: /* some debugging cruft by sklower, below, will go away soon */
590: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
591: register int plen = 0;
592: for (t = m; m; m = m->m_next)
593: plen += m->m_len;
594: t->m_pkthdr.len = plen;
595: }
1.25 cgd 596: return (ip);
1.1 cgd 597:
598: dropfrag:
599: ipstat.ips_fragdropped++;
600: m_freem(m);
1.25 cgd 601: FREE(ipqe, M_IPQ);
1.1 cgd 602: return (0);
603: }
604:
605: /*
606: * Free a fragment reassembly header and all
607: * associated datagrams.
608: */
1.8 mycroft 609: void
1.1 cgd 610: ip_freef(fp)
611: struct ipq *fp;
612: {
1.25 cgd 613: register struct ipqent *q, *p;
1.1 cgd 614:
1.25 cgd 615: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
616: p = q->ipqe_q.le_next;
617: m_freem(dtom(q->ipqe_ip));
618: LIST_REMOVE(q, ipqe_q);
619: FREE(q, M_IPQ);
1.1 cgd 620: }
1.25 cgd 621: LIST_REMOVE(fp, ipq_q);
1.1 cgd 622: (void) m_free(dtom(fp));
623: }
624:
625: /*
626: * IP timer processing;
627: * if a timer expires on a reassembly
628: * queue, discard it.
629: */
1.8 mycroft 630: void
1.1 cgd 631: ip_slowtimo()
632: {
1.25 cgd 633: register struct ipq *fp, *nfp;
1.24 mycroft 634: int s = splsoftnet();
1.1 cgd 635:
1.25 cgd 636: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
637: nfp = fp->ipq_q.le_next;
638: if (--fp->ipq_ttl == 0) {
1.1 cgd 639: ipstat.ips_fragtimeout++;
1.25 cgd 640: ip_freef(fp);
1.1 cgd 641: }
642: }
643: splx(s);
644: }
645:
646: /*
647: * Drain off all datagram fragments.
648: */
1.8 mycroft 649: void
1.1 cgd 650: ip_drain()
651: {
652:
1.25 cgd 653: while (ipq.lh_first != NULL) {
1.1 cgd 654: ipstat.ips_fragdropped++;
1.25 cgd 655: ip_freef(ipq.lh_first);
1.1 cgd 656: }
657: }
658:
659: /*
660: * Do option processing on a datagram,
661: * possibly discarding it if bad options are encountered,
662: * or forwarding it if source-routed.
663: * Returns 1 if packet has been forwarded/freed,
664: * 0 if the packet should be processed further.
665: */
1.8 mycroft 666: int
1.1 cgd 667: ip_dooptions(m)
668: struct mbuf *m;
669: {
670: register struct ip *ip = mtod(m, struct ip *);
671: register u_char *cp;
672: register struct ip_timestamp *ipt;
673: register struct in_ifaddr *ia;
674: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.13 mycroft 675: struct in_addr *sin, dst;
1.1 cgd 676: n_time ntime;
677:
1.13 mycroft 678: dst = ip->ip_dst;
1.1 cgd 679: cp = (u_char *)(ip + 1);
680: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
681: for (; cnt > 0; cnt -= optlen, cp += optlen) {
682: opt = cp[IPOPT_OPTVAL];
683: if (opt == IPOPT_EOL)
684: break;
685: if (opt == IPOPT_NOP)
686: optlen = 1;
687: else {
688: optlen = cp[IPOPT_OLEN];
689: if (optlen <= 0 || optlen > cnt) {
690: code = &cp[IPOPT_OLEN] - (u_char *)ip;
691: goto bad;
692: }
693: }
694: switch (opt) {
695:
696: default:
697: break;
698:
699: /*
700: * Source routing with record.
701: * Find interface with current destination address.
702: * If none on this machine then drop if strictly routed,
703: * or do nothing if loosely routed.
704: * Record interface address and bring up next address
705: * component. If strictly routed make sure next
706: * address is on directly accessible net.
707: */
708: case IPOPT_LSRR:
709: case IPOPT_SSRR:
710: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
711: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
712: goto bad;
713: }
714: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 715: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 716: if (ia == 0) {
717: if (opt == IPOPT_SSRR) {
718: type = ICMP_UNREACH;
719: code = ICMP_UNREACH_SRCFAIL;
720: goto bad;
721: }
722: /*
723: * Loose routing, and not at next destination
724: * yet; nothing to do except forward.
725: */
726: break;
727: }
728: off--; /* 0 origin */
729: if (off > optlen - sizeof(struct in_addr)) {
730: /*
731: * End of source route. Should be for us.
732: */
733: save_rte(cp, ip->ip_src);
734: break;
735: }
736: /*
737: * locate outgoing interface
738: */
739: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
740: sizeof(ipaddr.sin_addr));
741: if (opt == IPOPT_SSRR) {
742: #define INA struct in_ifaddr *
743: #define SA struct sockaddr *
1.29 mrg 744: ia = (INA)ifa_ifwithladdr((SA)&ipaddr);
1.1 cgd 745: } else
746: ia = ip_rtaddr(ipaddr.sin_addr);
747: if (ia == 0) {
748: type = ICMP_UNREACH;
749: code = ICMP_UNREACH_SRCFAIL;
750: goto bad;
751: }
752: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 753: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 754: (caddr_t)(cp + off), sizeof(struct in_addr));
755: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 756: /*
757: * Let ip_intr's mcast routing check handle mcast pkts
758: */
1.18 mycroft 759: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 760: break;
761:
762: case IPOPT_RR:
763: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
764: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
765: goto bad;
766: }
767: /*
768: * If no space remains, ignore.
769: */
770: off--; /* 0 origin */
771: if (off > optlen - sizeof(struct in_addr))
772: break;
773: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
774: sizeof(ipaddr.sin_addr));
775: /*
776: * locate outgoing interface; if we're the destination,
777: * use the incoming interface (should be same).
778: */
779: if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
780: (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
781: type = ICMP_UNREACH;
782: code = ICMP_UNREACH_HOST;
783: goto bad;
784: }
1.20 mycroft 785: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 786: (caddr_t)(cp + off), sizeof(struct in_addr));
787: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
788: break;
789:
790: case IPOPT_TS:
791: code = cp - (u_char *)ip;
792: ipt = (struct ip_timestamp *)cp;
793: if (ipt->ipt_len < 5)
794: goto bad;
1.15 cgd 795: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1 cgd 796: if (++ipt->ipt_oflw == 0)
797: goto bad;
798: break;
799: }
800: sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
801: switch (ipt->ipt_flg) {
802:
803: case IPOPT_TS_TSONLY:
804: break;
805:
806: case IPOPT_TS_TSANDADDR:
807: if (ipt->ipt_ptr + sizeof(n_time) +
808: sizeof(struct in_addr) > ipt->ipt_len)
809: goto bad;
1.13 mycroft 810: ipaddr.sin_addr = dst;
811: ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
812: m->m_pkthdr.rcvif);
813: if (ia == 0)
814: continue;
1.20 mycroft 815: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 816: (caddr_t)sin, sizeof(struct in_addr));
817: ipt->ipt_ptr += sizeof(struct in_addr);
818: break;
819:
820: case IPOPT_TS_PRESPEC:
821: if (ipt->ipt_ptr + sizeof(n_time) +
822: sizeof(struct in_addr) > ipt->ipt_len)
823: goto bad;
824: bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
825: sizeof(struct in_addr));
826: if (ifa_ifwithaddr((SA)&ipaddr) == 0)
827: continue;
828: ipt->ipt_ptr += sizeof(struct in_addr);
829: break;
830:
831: default:
832: goto bad;
833: }
834: ntime = iptime();
835: bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
836: sizeof(n_time));
837: ipt->ipt_ptr += sizeof(n_time);
838: }
839: }
840: if (forward) {
1.26 thorpej 841: if (ip_forwsrcrt == 0) {
842: type = ICMP_UNREACH;
843: code = ICMP_UNREACH_SRCFAIL;
844: goto bad;
845: }
1.1 cgd 846: ip_forward(m, 1);
847: return (1);
1.13 mycroft 848: }
849: return (0);
1.1 cgd 850: bad:
1.13 mycroft 851: ip->ip_len -= ip->ip_hl << 2; /* XXX icmp_error adds in hdr length */
852: icmp_error(m, type, code, 0, 0);
853: ipstat.ips_badoptions++;
1.1 cgd 854: return (1);
855: }
856:
857: /*
858: * Given address of next destination (final or next hop),
859: * return internet address info of interface to be used to get there.
860: */
861: struct in_ifaddr *
862: ip_rtaddr(dst)
863: struct in_addr dst;
864: {
865: register struct sockaddr_in *sin;
866:
1.19 mycroft 867: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 868:
869: if (ipforward_rt.ro_rt == 0 || dst.s_addr != sin->sin_addr.s_addr) {
870: if (ipforward_rt.ro_rt) {
871: RTFREE(ipforward_rt.ro_rt);
872: ipforward_rt.ro_rt = 0;
873: }
874: sin->sin_family = AF_INET;
875: sin->sin_len = sizeof(*sin);
876: sin->sin_addr = dst;
877:
878: rtalloc(&ipforward_rt);
879: }
880: if (ipforward_rt.ro_rt == 0)
881: return ((struct in_ifaddr *)0);
1.19 mycroft 882: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 883: }
884:
885: /*
886: * Save incoming source route for use in replies,
887: * to be picked up later by ip_srcroute if the receiver is interested.
888: */
1.13 mycroft 889: void
1.1 cgd 890: save_rte(option, dst)
891: u_char *option;
892: struct in_addr dst;
893: {
894: unsigned olen;
895:
896: olen = option[IPOPT_OLEN];
897: #ifdef DIAGNOSTIC
898: if (ipprintfs)
899: printf("save_rte: olen %d\n", olen);
900: #endif
901: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
902: return;
903: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
904: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
905: ip_srcrt.dst = dst;
906: }
907:
908: /*
909: * Retrieve incoming source route for use in replies,
910: * in the same form used by setsockopt.
911: * The first hop is placed before the options, will be removed later.
912: */
913: struct mbuf *
914: ip_srcroute()
915: {
916: register struct in_addr *p, *q;
917: register struct mbuf *m;
918:
919: if (ip_nhops == 0)
920: return ((struct mbuf *)0);
921: m = m_get(M_DONTWAIT, MT_SOOPTS);
922: if (m == 0)
923: return ((struct mbuf *)0);
924:
1.13 mycroft 925: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 926:
927: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
928: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
929: OPTSIZ;
930: #ifdef DIAGNOSTIC
931: if (ipprintfs)
932: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
933: #endif
934:
935: /*
936: * First save first hop for return route
937: */
938: p = &ip_srcrt.route[ip_nhops - 1];
939: *(mtod(m, struct in_addr *)) = *p--;
940: #ifdef DIAGNOSTIC
941: if (ipprintfs)
1.32 thorpej 942: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 943: #endif
944:
945: /*
946: * Copy option fields and padding (nop) to mbuf.
947: */
948: ip_srcrt.nop = IPOPT_NOP;
949: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
950: bcopy((caddr_t)&ip_srcrt.nop,
951: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
952: q = (struct in_addr *)(mtod(m, caddr_t) +
953: sizeof(struct in_addr) + OPTSIZ);
954: #undef OPTSIZ
955: /*
956: * Record return path as an IP source route,
957: * reversing the path (pointers are now aligned).
958: */
959: while (p >= ip_srcrt.route) {
960: #ifdef DIAGNOSTIC
961: if (ipprintfs)
1.32 thorpej 962: printf(" %x", ntohl(q->s_addr));
1.1 cgd 963: #endif
964: *q++ = *p--;
965: }
966: /*
967: * Last hop goes to final destination.
968: */
969: *q = ip_srcrt.dst;
970: #ifdef DIAGNOSTIC
971: if (ipprintfs)
1.32 thorpej 972: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 973: #endif
974: return (m);
975: }
976:
977: /*
978: * Strip out IP options, at higher
979: * level protocol in the kernel.
980: * Second argument is buffer to which options
981: * will be moved, and return value is their length.
982: * XXX should be deleted; last arg currently ignored.
983: */
1.8 mycroft 984: void
1.1 cgd 985: ip_stripoptions(m, mopt)
986: register struct mbuf *m;
987: struct mbuf *mopt;
988: {
989: register int i;
990: struct ip *ip = mtod(m, struct ip *);
991: register caddr_t opts;
992: int olen;
993:
994: olen = (ip->ip_hl<<2) - sizeof (struct ip);
995: opts = (caddr_t)(ip + 1);
996: i = m->m_len - (sizeof (struct ip) + olen);
997: bcopy(opts + olen, opts, (unsigned)i);
998: m->m_len -= olen;
999: if (m->m_flags & M_PKTHDR)
1000: m->m_pkthdr.len -= olen;
1001: ip->ip_hl = sizeof(struct ip) >> 2;
1002: }
1003:
1.23 mycroft 1004: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1005: 0, 0, 0, 0,
1006: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1007: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1008: EMSGSIZE, EHOSTUNREACH, 0, 0,
1009: 0, 0, 0, 0,
1010: ENOPROTOOPT
1011: };
1012:
1013: /*
1014: * Forward a packet. If some error occurs return the sender
1015: * an icmp packet. Note we can't always generate a meaningful
1016: * icmp message because icmp doesn't have a large enough repertoire
1017: * of codes and types.
1018: *
1019: * If not forwarding, just drop the packet. This could be confusing
1020: * if ipforwarding was zero but some routing protocol was advancing
1021: * us as a gateway to somewhere. However, we must let the routing
1022: * protocol deal with that.
1023: *
1024: * The srcrt parameter indicates whether the packet is being forwarded
1025: * via a source route.
1026: */
1.13 mycroft 1027: void
1.1 cgd 1028: ip_forward(m, srcrt)
1029: struct mbuf *m;
1030: int srcrt;
1031: {
1032: register struct ip *ip = mtod(m, struct ip *);
1033: register struct sockaddr_in *sin;
1034: register struct rtentry *rt;
1.28 christos 1035: int error, type = 0, code = 0;
1.1 cgd 1036: struct mbuf *mcopy;
1.13 mycroft 1037: n_long dest;
1038: struct ifnet *destifp;
1.1 cgd 1039:
1.13 mycroft 1040: dest = 0;
1.1 cgd 1041: #ifdef DIAGNOSTIC
1042: if (ipprintfs)
1.28 christos 1043: printf("forward: src %x dst %x ttl %x\n",
1044: ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl);
1.1 cgd 1045: #endif
1046: if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) {
1047: ipstat.ips_cantforward++;
1048: m_freem(m);
1049: return;
1050: }
1051: HTONS(ip->ip_id);
1052: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1053: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1054: return;
1055: }
1056: ip->ip_ttl -= IPTTLDEC;
1057:
1.19 mycroft 1058: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1059: if ((rt = ipforward_rt.ro_rt) == 0 ||
1060: ip->ip_dst.s_addr != sin->sin_addr.s_addr) {
1061: if (ipforward_rt.ro_rt) {
1062: RTFREE(ipforward_rt.ro_rt);
1063: ipforward_rt.ro_rt = 0;
1064: }
1065: sin->sin_family = AF_INET;
1066: sin->sin_len = sizeof(*sin);
1067: sin->sin_addr = ip->ip_dst;
1068:
1069: rtalloc(&ipforward_rt);
1070: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1071: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1072: return;
1073: }
1074: rt = ipforward_rt.ro_rt;
1075: }
1076:
1077: /*
1078: * Save at most 64 bytes of the packet in case
1079: * we need to generate an ICMP message to the src.
1080: */
1081: mcopy = m_copy(m, 0, imin((int)ip->ip_len, 64));
1082:
1083: /*
1084: * If forwarding packet using same interface that it came in on,
1085: * perhaps should send a redirect to sender to shortcut a hop.
1086: * Only send redirect if source is sending directly to us,
1087: * and if packet was not source routed (or has any options).
1088: * Also, don't send redirect if forwarding using a default route
1089: * or a route modified by a redirect.
1090: */
1091: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1092: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1093: satosin(rt_key(rt))->sin_addr.s_addr != 0 &&
1094: ipsendredirects && !srcrt) {
1.19 mycroft 1095: if (rt->rt_ifa &&
1096: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1097: ifatoia(rt->rt_ifa)->ia_subnet) {
1.1 cgd 1098: if (rt->rt_flags & RTF_GATEWAY)
1.13 mycroft 1099: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1.1 cgd 1100: else
1.13 mycroft 1101: dest = ip->ip_dst.s_addr;
1102: /* Router requirements says to only send host redirects */
1.1 cgd 1103: type = ICMP_REDIRECT;
1.13 mycroft 1104: code = ICMP_REDIRECT_HOST;
1.1 cgd 1105: #ifdef DIAGNOSTIC
1106: if (ipprintfs)
1.30 christos 1107: printf("redirect (%d) to %x\n", code, (u_int32_t)dest);
1.1 cgd 1108: #endif
1109: }
1110: }
1111:
1.27 thorpej 1112: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1113: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1114: if (error)
1115: ipstat.ips_cantforward++;
1116: else {
1117: ipstat.ips_forward++;
1118: if (type)
1119: ipstat.ips_redirectsent++;
1120: else {
1121: if (mcopy)
1122: m_freem(mcopy);
1123: return;
1124: }
1125: }
1126: if (mcopy == NULL)
1127: return;
1.13 mycroft 1128: destifp = NULL;
1129:
1.1 cgd 1130: switch (error) {
1131:
1132: case 0: /* forwarded, but need redirect */
1133: /* type, code set above */
1134: break;
1135:
1136: case ENETUNREACH: /* shouldn't happen, checked above */
1137: case EHOSTUNREACH:
1138: case ENETDOWN:
1139: case EHOSTDOWN:
1140: default:
1141: type = ICMP_UNREACH;
1142: code = ICMP_UNREACH_HOST;
1143: break;
1144:
1145: case EMSGSIZE:
1146: type = ICMP_UNREACH;
1147: code = ICMP_UNREACH_NEEDFRAG;
1.13 mycroft 1148: if (ipforward_rt.ro_rt)
1149: destifp = ipforward_rt.ro_rt->rt_ifp;
1.1 cgd 1150: ipstat.ips_cantfrag++;
1151: break;
1152:
1153: case ENOBUFS:
1154: type = ICMP_SOURCEQUENCH;
1155: code = 0;
1156: break;
1157: }
1.13 mycroft 1158: icmp_error(mcopy, type, code, dest, destifp);
1159: }
1160:
1161: int
1162: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1163: int *name;
1164: u_int namelen;
1165: void *oldp;
1166: size_t *oldlenp;
1167: void *newp;
1168: size_t newlen;
1169: {
1170: /* All sysctl names at this level are terminal. */
1171: if (namelen != 1)
1172: return (ENOTDIR);
1173:
1174: switch (name[0]) {
1175: case IPCTL_FORWARDING:
1176: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1177: case IPCTL_SENDREDIRECTS:
1178: return (sysctl_int(oldp, oldlenp, newp, newlen,
1179: &ipsendredirects));
1180: case IPCTL_DEFTTL:
1181: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1182: #ifdef notyet
1183: case IPCTL_DEFMTU:
1184: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1185: #endif
1.26 thorpej 1186: case IPCTL_FORWSRCRT:
1187: /*
1188: * Don't allow this to change in a secure environment.
1189: */
1190: if (securelevel > 0)
1191: return (EPERM);
1192: return (sysctl_int(oldp, oldlenp, newp, newlen,
1193: &ip_forwsrcrt));
1.27 thorpej 1194: case IPCTL_DIRECTEDBCAST:
1195: return (sysctl_int(oldp, oldlenp, newp, newlen,
1196: &ip_directedbcast));
1.13 mycroft 1197: default:
1198: return (EOPNOTSUPP);
1199: }
1200: /* NOTREACHED */
1.1 cgd 1201: }
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