Annotation of src/sys/netinet/ip_input.c, Revision 1.54
1.54 ! lukem 1: /* $NetBSD: ip_input.c,v 1.53 1997/10/18 21:18:31 kml 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>
1.44 thorpej 45: #include <sys/socketvar.h>
1.5 mycroft 46: #include <sys/errno.h>
47: #include <sys/time.h>
48: #include <sys/kernel.h>
1.28 christos 49: #include <sys/proc.h>
50:
51: #include <vm/vm.h>
52: #include <sys/sysctl.h>
1.1 cgd 53:
1.5 mycroft 54: #include <net/if.h>
1.44 thorpej 55: #include <net/if_dl.h>
1.5 mycroft 56: #include <net/route.h>
1.45 mrg 57: #include <net/pfil.h>
1.1 cgd 58:
1.5 mycroft 59: #include <netinet/in.h>
60: #include <netinet/in_systm.h>
61: #include <netinet/ip.h>
62: #include <netinet/in_pcb.h>
63: #include <netinet/in_var.h>
64: #include <netinet/ip_var.h>
65: #include <netinet/ip_icmp.h>
1.36 mrg 66:
1.44 thorpej 67: /* XXX should really put this in libkern.h */
68: #define offsetof(type, member) ((size_t)(&((type *)0)->member))
69:
1.1 cgd 70: #ifndef IPFORWARDING
71: #ifdef GATEWAY
72: #define IPFORWARDING 1 /* forward IP packets not for us */
73: #else /* GATEWAY */
74: #define IPFORWARDING 0 /* don't forward IP packets not for us */
75: #endif /* GATEWAY */
76: #endif /* IPFORWARDING */
77: #ifndef IPSENDREDIRECTS
78: #define IPSENDREDIRECTS 1
79: #endif
1.26 thorpej 80: #ifndef IPFORWSRCRT
1.47 cjs 81: #define IPFORWSRCRT 1 /* forward source-routed packets */
82: #endif
83: #ifndef IPALLOWSRCRT
1.48 mrg 84: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 85: #endif
1.53 kml 86: #ifndef IPMTUDISC
87: #define IPMTUDISC 0
88: #endif
89:
1.27 thorpej 90: /*
91: * Note: DIRECTED_BROADCAST is handled this way so that previous
92: * configuration using this option will Just Work.
93: */
94: #ifndef IPDIRECTEDBCAST
95: #ifdef DIRECTED_BROADCAST
96: #define IPDIRECTEDBCAST 1
97: #else
98: #define IPDIRECTEDBCAST 0
99: #endif /* DIRECTED_BROADCAST */
100: #endif /* IPDIRECTEDBCAST */
1.1 cgd 101: int ipforwarding = IPFORWARDING;
102: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 103: int ip_defttl = IPDEFTTL;
1.26 thorpej 104: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 105: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 106: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 107: int ip_mtudisc = IPMTUDISC;
1.1 cgd 108: #ifdef DIAGNOSTIC
109: int ipprintfs = 0;
110: #endif
111:
112: extern struct domain inetdomain;
113: extern struct protosw inetsw[];
114: u_char ip_protox[IPPROTO_MAX];
115: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 116: struct in_ifaddrhead in_ifaddr;
1.13 mycroft 117: struct ifqueue ipintrq;
1.1 cgd 118:
119: /*
120: * We need to save the IP options in case a protocol wants to respond
121: * to an incoming packet over the same route if the packet got here
122: * using IP source routing. This allows connection establishment and
123: * maintenance when the remote end is on a network that is not known
124: * to us.
125: */
126: int ip_nhops = 0;
127: static struct ip_srcrt {
128: struct in_addr dst; /* final destination */
129: char nop; /* one NOP to align */
130: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
131: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
132: } ip_srcrt;
133:
1.13 mycroft 134: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 135:
1.1 cgd 136: /*
137: * IP initialization: fill in IP protocol switch table.
138: * All protocols not implemented in kernel go to raw IP protocol handler.
139: */
1.8 mycroft 140: void
1.1 cgd 141: ip_init()
142: {
143: register struct protosw *pr;
144: register int i;
145:
146: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
147: if (pr == 0)
148: panic("ip_init");
149: for (i = 0; i < IPPROTO_MAX; i++)
150: ip_protox[i] = pr - inetsw;
151: for (pr = inetdomain.dom_protosw;
152: pr < inetdomain.dom_protoswNPROTOSW; pr++)
153: if (pr->pr_domain->dom_family == PF_INET &&
154: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
155: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 156: LIST_INIT(&ipq);
1.1 cgd 157: ip_id = time.tv_sec & 0xffff;
158: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 159: TAILQ_INIT(&in_ifaddr);
1.1 cgd 160: }
161:
162: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
163: struct route ipforward_rt;
164:
165: /*
166: * Ip input routine. Checksum and byte swap header. If fragmented
167: * try to reassemble. Process options. Pass to next level.
168: */
1.8 mycroft 169: void
1.1 cgd 170: ipintr()
171: {
1.33 mrg 172: register struct ip *ip = NULL;
1.1 cgd 173: register struct mbuf *m;
174: register struct ipq *fp;
175: register struct in_ifaddr *ia;
1.25 cgd 176: struct ipqent *ipqe;
1.35 mycroft 177: int hlen = 0, mff, len, s;
1.36 mrg 178: #ifdef PFIL_HOOKS
1.33 mrg 179: struct packet_filter_hook *pfh;
180: struct mbuf *m0;
1.43 mrg 181: int rv;
1.36 mrg 182: #endif /* PFIL_HOOKS */
1.1 cgd 183:
184: next:
185: /*
186: * Get next datagram off input queue and get IP header
187: * in first mbuf.
188: */
189: s = splimp();
190: IF_DEQUEUE(&ipintrq, m);
191: splx(s);
1.13 mycroft 192: if (m == 0)
1.1 cgd 193: return;
194: #ifdef DIAGNOSTIC
195: if ((m->m_flags & M_PKTHDR) == 0)
196: panic("ipintr no HDR");
197: #endif
198: /*
199: * If no IP addresses have been set yet but the interfaces
200: * are receiving, can't do anything with incoming packets yet.
201: */
1.22 mycroft 202: if (in_ifaddr.tqh_first == 0)
1.1 cgd 203: goto bad;
204: ipstat.ips_total++;
205: if (m->m_len < sizeof (struct ip) &&
206: (m = m_pullup(m, sizeof (struct ip))) == 0) {
207: ipstat.ips_toosmall++;
208: goto next;
209: }
210: ip = mtod(m, struct ip *);
1.13 mycroft 211: if (ip->ip_v != IPVERSION) {
212: ipstat.ips_badvers++;
213: goto bad;
214: }
1.1 cgd 215: hlen = ip->ip_hl << 2;
216: if (hlen < sizeof(struct ip)) { /* minimum header length */
217: ipstat.ips_badhlen++;
218: goto bad;
219: }
220: if (hlen > m->m_len) {
221: if ((m = m_pullup(m, hlen)) == 0) {
222: ipstat.ips_badhlen++;
223: goto next;
224: }
225: ip = mtod(m, struct ip *);
226: }
1.28 christos 227: if ((ip->ip_sum = in_cksum(m, hlen)) != 0) {
1.1 cgd 228: ipstat.ips_badsum++;
229: goto bad;
230: }
231:
232: /*
233: * Convert fields to host representation.
234: */
235: NTOHS(ip->ip_len);
236: NTOHS(ip->ip_id);
237: NTOHS(ip->ip_off);
1.35 mycroft 238: len = ip->ip_len;
1.1 cgd 239:
240: /*
241: * Check that the amount of data in the buffers
242: * is as at least much as the IP header would have us expect.
243: * Trim mbufs if longer than we expect.
244: * Drop packet if shorter than we expect.
245: */
1.35 mycroft 246: if (m->m_pkthdr.len < len) {
1.1 cgd 247: ipstat.ips_tooshort++;
248: goto bad;
249: }
1.35 mycroft 250: if (m->m_pkthdr.len > len) {
1.1 cgd 251: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 252: m->m_len = len;
253: m->m_pkthdr.len = len;
1.1 cgd 254: } else
1.35 mycroft 255: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 256: }
257:
1.36 mrg 258: #ifdef PFIL_HOOKS
1.33 mrg 259: /*
260: * Run through list of hooks for input packets.
261: */
262: m0 = m;
263: for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.le_next)
264: if (pfh->pfil_func) {
1.43 mrg 265: rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0);
266: if (rv)
1.40 veego 267: goto next;
1.49 christos 268: ip = mtod(m = m0, struct ip *);
1.33 mrg 269: }
1.36 mrg 270: #endif /* PFIL_HOOKS */
1.33 mrg 271:
1.1 cgd 272: /*
273: * Process options and, if not destined for us,
274: * ship it on. ip_dooptions returns 1 when an
275: * error was detected (causing an icmp message
276: * to be sent and the original packet to be freed).
277: */
278: ip_nhops = 0; /* for source routed packets */
279: if (hlen > sizeof (struct ip) && ip_dooptions(m))
280: goto next;
281:
282: /*
283: * Check our list of addresses, to see if the packet is for us.
284: */
1.22 mycroft 285: for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) {
1.35 mycroft 286: if (in_hosteq(ip->ip_dst, ia->ia_addr.sin_addr))
1.1 cgd 287: goto ours;
1.27 thorpej 288: if (((ip_directedbcast == 0) || (ip_directedbcast &&
289: ia->ia_ifp == m->m_pkthdr.rcvif)) &&
1.1 cgd 290: (ia->ia_ifp->if_flags & IFF_BROADCAST)) {
1.35 mycroft 291: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
292: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 293: /*
294: * Look for all-0's host part (old broadcast addr),
295: * either for subnet or net.
296: */
297: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 298: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 299: goto ours;
300: }
1.51 gwr 301: /*
302: * An interface with IP address zero accepts
303: * all packets that arrive on that interface.
304: */
305: if ((ia->ia_ifp == m->m_pkthdr.rcvif) &&
306: in_nullhost(ia->ia_addr.sin_addr))
307: goto ours;
1.1 cgd 308: }
1.18 mycroft 309: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 310: struct in_multi *inm;
311: #ifdef MROUTING
312: extern struct socket *ip_mrouter;
1.10 brezak 313:
314: if (m->m_flags & M_EXT) {
315: if ((m = m_pullup(m, hlen)) == 0) {
316: ipstat.ips_toosmall++;
317: goto next;
318: }
319: ip = mtod(m, struct ip *);
320: }
1.4 hpeyerl 321:
322: if (ip_mrouter) {
323: /*
324: * If we are acting as a multicast router, all
325: * incoming multicast packets are passed to the
326: * kernel-level multicast forwarding function.
327: * The packet is returned (relatively) intact; if
328: * ip_mforward() returns a non-zero value, the packet
329: * must be discarded, else it may be accepted below.
330: *
331: * (The IP ident field is put in the same byte order
332: * as expected when ip_mforward() is called from
333: * ip_output().)
334: */
335: ip->ip_id = htons(ip->ip_id);
1.13 mycroft 336: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
337: ipstat.ips_cantforward++;
1.4 hpeyerl 338: m_freem(m);
339: goto next;
340: }
341: ip->ip_id = ntohs(ip->ip_id);
342:
343: /*
344: * The process-level routing demon needs to receive
345: * all multicast IGMP packets, whether or not this
346: * host belongs to their destination groups.
347: */
348: if (ip->ip_p == IPPROTO_IGMP)
349: goto ours;
1.13 mycroft 350: ipstat.ips_forward++;
1.4 hpeyerl 351: }
352: #endif
353: /*
354: * See if we belong to the destination multicast group on the
355: * arrival interface.
356: */
357: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
358: if (inm == NULL) {
1.13 mycroft 359: ipstat.ips_cantforward++;
1.4 hpeyerl 360: m_freem(m);
361: goto next;
362: }
363: goto ours;
364: }
1.19 mycroft 365: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 366: in_nullhost(ip->ip_dst))
1.1 cgd 367: goto ours;
368:
369: /*
370: * Not for us; forward if possible and desirable.
371: */
372: if (ipforwarding == 0) {
373: ipstat.ips_cantforward++;
374: m_freem(m);
375: } else
376: ip_forward(m, 0);
377: goto next;
378:
379: ours:
380: /*
381: * If offset or IP_MF are set, must reassemble.
382: * Otherwise, nothing need be done.
383: * (We could look in the reassembly queue to see
384: * if the packet was previously fragmented,
385: * but it's not worth the time; just let them time out.)
386: */
1.37 perry 387: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 388: /*
389: * Look for queue of fragments
390: * of this datagram.
391: */
1.25 cgd 392: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 393: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 394: in_hosteq(ip->ip_src, fp->ipq_src) &&
395: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 396: ip->ip_p == fp->ipq_p)
397: goto found;
398: fp = 0;
399: found:
400:
401: /*
402: * Adjust ip_len to not reflect header,
1.25 cgd 403: * set ipqe_mff if more fragments are expected,
1.1 cgd 404: * convert offset of this to bytes.
405: */
406: ip->ip_len -= hlen;
1.25 cgd 407: mff = (ip->ip_off & IP_MF) != 0;
408: if (mff) {
1.16 cgd 409: /*
410: * Make sure that fragments have a data length
411: * that's a non-zero multiple of 8 bytes.
412: */
1.17 cgd 413: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 414: ipstat.ips_badfrags++;
415: goto bad;
416: }
417: }
1.1 cgd 418: ip->ip_off <<= 3;
419:
420: /*
421: * If datagram marked as having more fragments
422: * or if this is not the first fragment,
423: * attempt reassembly; if it succeeds, proceed.
424: */
1.25 cgd 425: if (mff || ip->ip_off) {
1.1 cgd 426: ipstat.ips_fragments++;
1.25 cgd 427: MALLOC(ipqe, struct ipqent *, sizeof (struct ipqent),
428: M_IPQ, M_NOWAIT);
429: if (ipqe == NULL) {
430: ipstat.ips_rcvmemdrop++;
431: goto bad;
432: }
433: ipqe->ipqe_mff = mff;
1.50 thorpej 434: ipqe->ipqe_m = m;
1.25 cgd 435: ipqe->ipqe_ip = ip;
1.50 thorpej 436: m = ip_reass(ipqe, fp);
437: if (m == 0)
1.1 cgd 438: goto next;
1.13 mycroft 439: ipstat.ips_reassembled++;
1.50 thorpej 440: ip = mtod(m, struct ip *);
1.1 cgd 441: } else
442: if (fp)
443: ip_freef(fp);
444: } else
445: ip->ip_len -= hlen;
446:
447: /*
448: * Switch out to protocol's input routine.
449: */
450: ipstat.ips_delivered++;
451: (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
452: goto next;
453: bad:
454: m_freem(m);
455: goto next;
456: }
457:
458: /*
459: * Take incoming datagram fragment and try to
460: * reassemble it into whole datagram. If a chain for
461: * reassembly of this datagram already exists, then it
462: * is given as fp; otherwise have to make a chain.
463: */
1.50 thorpej 464: struct mbuf *
1.25 cgd 465: ip_reass(ipqe, fp)
466: register struct ipqent *ipqe;
1.1 cgd 467: register struct ipq *fp;
468: {
1.50 thorpej 469: register struct mbuf *m = ipqe->ipqe_m;
1.25 cgd 470: register struct ipqent *nq, *p, *q;
471: struct ip *ip;
1.1 cgd 472: struct mbuf *t;
1.25 cgd 473: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 474: int i, next;
475:
476: /*
477: * Presence of header sizes in mbufs
478: * would confuse code below.
479: */
480: m->m_data += hlen;
481: m->m_len -= hlen;
482:
483: /*
484: * If first fragment to arrive, create a reassembly queue.
485: */
486: if (fp == 0) {
1.50 thorpej 487: MALLOC(fp, struct ipq *, sizeof (struct ipq),
488: M_FTABLE, M_NOWAIT);
489: if (fp == NULL)
1.1 cgd 490: goto dropfrag;
1.25 cgd 491: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 492: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 493: fp->ipq_p = ipqe->ipqe_ip->ip_p;
494: fp->ipq_id = ipqe->ipqe_ip->ip_id;
495: LIST_INIT(&fp->ipq_fragq);
496: fp->ipq_src = ipqe->ipqe_ip->ip_src;
497: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
498: p = NULL;
1.1 cgd 499: goto insert;
500: }
501:
502: /*
503: * Find a segment which begins after this one does.
504: */
1.25 cgd 505: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
506: p = q, q = q->ipqe_q.le_next)
507: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 508: break;
509:
510: /*
511: * If there is a preceding segment, it may provide some of
512: * our data already. If so, drop the data from the incoming
513: * segment. If it provides all of our data, drop us.
514: */
1.25 cgd 515: if (p != NULL) {
516: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
517: ipqe->ipqe_ip->ip_off;
1.1 cgd 518: if (i > 0) {
1.25 cgd 519: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 520: goto dropfrag;
1.50 thorpej 521: m_adj(ipqe->ipqe_m, i);
1.25 cgd 522: ipqe->ipqe_ip->ip_off += i;
523: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 524: }
525: }
526:
527: /*
528: * While we overlap succeeding segments trim them or,
529: * if they are completely covered, dequeue them.
530: */
1.25 cgd 531: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
532: q->ipqe_ip->ip_off; q = nq) {
533: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
534: q->ipqe_ip->ip_off;
535: if (i < q->ipqe_ip->ip_len) {
536: q->ipqe_ip->ip_len -= i;
537: q->ipqe_ip->ip_off += i;
1.50 thorpej 538: m_adj(q->ipqe_m, i);
1.1 cgd 539: break;
540: }
1.25 cgd 541: nq = q->ipqe_q.le_next;
1.50 thorpej 542: m_freem(q->ipqe_m);
1.25 cgd 543: LIST_REMOVE(q, ipqe_q);
544: FREE(q, M_IPQ);
1.1 cgd 545: }
546:
547: insert:
548: /*
549: * Stick new segment in its place;
550: * check for complete reassembly.
551: */
1.25 cgd 552: if (p == NULL) {
553: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
554: } else {
555: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
556: }
1.1 cgd 557: next = 0;
1.25 cgd 558: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
559: p = q, q = q->ipqe_q.le_next) {
560: if (q->ipqe_ip->ip_off != next)
1.1 cgd 561: return (0);
1.25 cgd 562: next += q->ipqe_ip->ip_len;
1.1 cgd 563: }
1.25 cgd 564: if (p->ipqe_mff)
1.1 cgd 565: return (0);
566:
567: /*
1.41 thorpej 568: * Reassembly is complete. Check for a bogus message size and
569: * concatenate fragments.
1.1 cgd 570: */
1.25 cgd 571: q = fp->ipq_fragq.lh_first;
572: ip = q->ipqe_ip;
1.41 thorpej 573: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
574: ipstat.ips_toolong++;
575: ip_freef(fp);
576: return (0);
577: }
1.50 thorpej 578: m = q->ipqe_m;
1.1 cgd 579: t = m->m_next;
580: m->m_next = 0;
581: m_cat(m, t);
1.25 cgd 582: nq = q->ipqe_q.le_next;
583: FREE(q, M_IPQ);
584: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 585: t = q->ipqe_m;
1.25 cgd 586: nq = q->ipqe_q.le_next;
587: FREE(q, M_IPQ);
1.1 cgd 588: m_cat(m, t);
589: }
590:
591: /*
592: * Create header for new ip packet by
593: * modifying header of first packet;
594: * dequeue and discard fragment reassembly header.
595: * Make header visible.
596: */
597: ip->ip_len = next;
1.25 cgd 598: ip->ip_src = fp->ipq_src;
599: ip->ip_dst = fp->ipq_dst;
600: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 601: FREE(fp, M_FTABLE);
1.1 cgd 602: m->m_len += (ip->ip_hl << 2);
603: m->m_data -= (ip->ip_hl << 2);
604: /* some debugging cruft by sklower, below, will go away soon */
605: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
606: register int plen = 0;
1.50 thorpej 607: for (t = m; t; t = t->m_next)
608: plen += t->m_len;
609: m->m_pkthdr.len = plen;
1.1 cgd 610: }
1.50 thorpej 611: return (m);
1.1 cgd 612:
613: dropfrag:
614: ipstat.ips_fragdropped++;
615: m_freem(m);
1.25 cgd 616: FREE(ipqe, M_IPQ);
1.1 cgd 617: return (0);
618: }
619:
620: /*
621: * Free a fragment reassembly header and all
622: * associated datagrams.
623: */
1.8 mycroft 624: void
1.1 cgd 625: ip_freef(fp)
626: struct ipq *fp;
627: {
1.25 cgd 628: register struct ipqent *q, *p;
1.1 cgd 629:
1.25 cgd 630: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
631: p = q->ipqe_q.le_next;
1.50 thorpej 632: m_freem(q->ipqe_m);
1.25 cgd 633: LIST_REMOVE(q, ipqe_q);
634: FREE(q, M_IPQ);
1.1 cgd 635: }
1.25 cgd 636: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 637: FREE(fp, M_FTABLE);
1.1 cgd 638: }
639:
640: /*
641: * IP timer processing;
642: * if a timer expires on a reassembly
643: * queue, discard it.
644: */
1.8 mycroft 645: void
1.1 cgd 646: ip_slowtimo()
647: {
1.25 cgd 648: register struct ipq *fp, *nfp;
1.24 mycroft 649: int s = splsoftnet();
1.1 cgd 650:
1.25 cgd 651: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
652: nfp = fp->ipq_q.le_next;
653: if (--fp->ipq_ttl == 0) {
1.1 cgd 654: ipstat.ips_fragtimeout++;
1.25 cgd 655: ip_freef(fp);
1.1 cgd 656: }
657: }
658: splx(s);
659: }
660:
661: /*
662: * Drain off all datagram fragments.
663: */
1.8 mycroft 664: void
1.1 cgd 665: ip_drain()
666: {
667:
1.25 cgd 668: while (ipq.lh_first != NULL) {
1.1 cgd 669: ipstat.ips_fragdropped++;
1.25 cgd 670: ip_freef(ipq.lh_first);
1.1 cgd 671: }
672: }
673:
674: /*
675: * Do option processing on a datagram,
676: * possibly discarding it if bad options are encountered,
677: * or forwarding it if source-routed.
678: * Returns 1 if packet has been forwarded/freed,
679: * 0 if the packet should be processed further.
680: */
1.8 mycroft 681: int
1.1 cgd 682: ip_dooptions(m)
683: struct mbuf *m;
684: {
685: register struct ip *ip = mtod(m, struct ip *);
686: register u_char *cp;
687: register struct ip_timestamp *ipt;
688: register struct in_ifaddr *ia;
689: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.13 mycroft 690: struct in_addr *sin, dst;
1.1 cgd 691: n_time ntime;
692:
1.13 mycroft 693: dst = ip->ip_dst;
1.1 cgd 694: cp = (u_char *)(ip + 1);
695: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
696: for (; cnt > 0; cnt -= optlen, cp += optlen) {
697: opt = cp[IPOPT_OPTVAL];
698: if (opt == IPOPT_EOL)
699: break;
700: if (opt == IPOPT_NOP)
701: optlen = 1;
702: else {
703: optlen = cp[IPOPT_OLEN];
704: if (optlen <= 0 || optlen > cnt) {
705: code = &cp[IPOPT_OLEN] - (u_char *)ip;
706: goto bad;
707: }
708: }
709: switch (opt) {
710:
711: default:
712: break;
713:
714: /*
715: * Source routing with record.
716: * Find interface with current destination address.
717: * If none on this machine then drop if strictly routed,
718: * or do nothing if loosely routed.
719: * Record interface address and bring up next address
720: * component. If strictly routed make sure next
721: * address is on directly accessible net.
722: */
723: case IPOPT_LSRR:
724: case IPOPT_SSRR:
1.47 cjs 725: if (ip_allowsrcrt == 0) {
726: type = ICMP_UNREACH;
727: code = ICMP_UNREACH_NET_PROHIB;
728: goto bad;
729: }
1.1 cgd 730: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
731: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
732: goto bad;
733: }
734: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 735: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 736: if (ia == 0) {
737: if (opt == IPOPT_SSRR) {
738: type = ICMP_UNREACH;
739: code = ICMP_UNREACH_SRCFAIL;
740: goto bad;
741: }
742: /*
743: * Loose routing, and not at next destination
744: * yet; nothing to do except forward.
745: */
746: break;
747: }
748: off--; /* 0 origin */
749: if (off > optlen - sizeof(struct in_addr)) {
750: /*
751: * End of source route. Should be for us.
752: */
753: save_rte(cp, ip->ip_src);
754: break;
755: }
756: /*
757: * locate outgoing interface
758: */
759: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
760: sizeof(ipaddr.sin_addr));
761: if (opt == IPOPT_SSRR) {
762: #define INA struct in_ifaddr *
763: #define SA struct sockaddr *
1.29 mrg 764: ia = (INA)ifa_ifwithladdr((SA)&ipaddr);
1.1 cgd 765: } else
766: ia = ip_rtaddr(ipaddr.sin_addr);
767: if (ia == 0) {
768: type = ICMP_UNREACH;
769: code = ICMP_UNREACH_SRCFAIL;
770: goto bad;
771: }
772: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 773: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 774: (caddr_t)(cp + off), sizeof(struct in_addr));
775: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 776: /*
777: * Let ip_intr's mcast routing check handle mcast pkts
778: */
1.18 mycroft 779: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 780: break;
781:
782: case IPOPT_RR:
783: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
784: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
785: goto bad;
786: }
787: /*
788: * If no space remains, ignore.
789: */
790: off--; /* 0 origin */
791: if (off > optlen - sizeof(struct in_addr))
792: break;
793: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
794: sizeof(ipaddr.sin_addr));
795: /*
796: * locate outgoing interface; if we're the destination,
797: * use the incoming interface (should be same).
798: */
799: if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
800: (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
801: type = ICMP_UNREACH;
802: code = ICMP_UNREACH_HOST;
803: goto bad;
804: }
1.20 mycroft 805: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 806: (caddr_t)(cp + off), sizeof(struct in_addr));
807: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
808: break;
809:
810: case IPOPT_TS:
811: code = cp - (u_char *)ip;
812: ipt = (struct ip_timestamp *)cp;
813: if (ipt->ipt_len < 5)
814: goto bad;
1.15 cgd 815: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1 cgd 816: if (++ipt->ipt_oflw == 0)
817: goto bad;
818: break;
819: }
820: sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
821: switch (ipt->ipt_flg) {
822:
823: case IPOPT_TS_TSONLY:
824: break;
825:
826: case IPOPT_TS_TSANDADDR:
827: if (ipt->ipt_ptr + sizeof(n_time) +
828: sizeof(struct in_addr) > ipt->ipt_len)
829: goto bad;
1.13 mycroft 830: ipaddr.sin_addr = dst;
831: ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
832: m->m_pkthdr.rcvif);
833: if (ia == 0)
834: continue;
1.20 mycroft 835: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 836: (caddr_t)sin, sizeof(struct in_addr));
837: ipt->ipt_ptr += sizeof(struct in_addr);
838: break;
839:
840: case IPOPT_TS_PRESPEC:
841: if (ipt->ipt_ptr + sizeof(n_time) +
842: sizeof(struct in_addr) > ipt->ipt_len)
843: goto bad;
844: bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
845: sizeof(struct in_addr));
846: if (ifa_ifwithaddr((SA)&ipaddr) == 0)
847: continue;
848: ipt->ipt_ptr += sizeof(struct in_addr);
849: break;
850:
851: default:
852: goto bad;
853: }
854: ntime = iptime();
855: bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
856: sizeof(n_time));
857: ipt->ipt_ptr += sizeof(n_time);
858: }
859: }
860: if (forward) {
1.26 thorpej 861: if (ip_forwsrcrt == 0) {
862: type = ICMP_UNREACH;
863: code = ICMP_UNREACH_SRCFAIL;
864: goto bad;
865: }
1.1 cgd 866: ip_forward(m, 1);
867: return (1);
1.13 mycroft 868: }
869: return (0);
1.1 cgd 870: bad:
1.13 mycroft 871: ip->ip_len -= ip->ip_hl << 2; /* XXX icmp_error adds in hdr length */
872: icmp_error(m, type, code, 0, 0);
873: ipstat.ips_badoptions++;
1.1 cgd 874: return (1);
875: }
876:
877: /*
878: * Given address of next destination (final or next hop),
879: * return internet address info of interface to be used to get there.
880: */
881: struct in_ifaddr *
882: ip_rtaddr(dst)
883: struct in_addr dst;
884: {
885: register struct sockaddr_in *sin;
886:
1.19 mycroft 887: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 888:
1.35 mycroft 889: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 890: if (ipforward_rt.ro_rt) {
891: RTFREE(ipforward_rt.ro_rt);
892: ipforward_rt.ro_rt = 0;
893: }
894: sin->sin_family = AF_INET;
895: sin->sin_len = sizeof(*sin);
896: sin->sin_addr = dst;
897:
898: rtalloc(&ipforward_rt);
899: }
900: if (ipforward_rt.ro_rt == 0)
901: return ((struct in_ifaddr *)0);
1.19 mycroft 902: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 903: }
904:
905: /*
906: * Save incoming source route for use in replies,
907: * to be picked up later by ip_srcroute if the receiver is interested.
908: */
1.13 mycroft 909: void
1.1 cgd 910: save_rte(option, dst)
911: u_char *option;
912: struct in_addr dst;
913: {
914: unsigned olen;
915:
916: olen = option[IPOPT_OLEN];
917: #ifdef DIAGNOSTIC
918: if (ipprintfs)
1.39 christos 919: printf("save_rte: olen %d\n", olen);
1.1 cgd 920: #endif
921: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
922: return;
923: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
924: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
925: ip_srcrt.dst = dst;
926: }
927:
928: /*
929: * Retrieve incoming source route for use in replies,
930: * in the same form used by setsockopt.
931: * The first hop is placed before the options, will be removed later.
932: */
933: struct mbuf *
934: ip_srcroute()
935: {
936: register struct in_addr *p, *q;
937: register struct mbuf *m;
938:
939: if (ip_nhops == 0)
940: return ((struct mbuf *)0);
941: m = m_get(M_DONTWAIT, MT_SOOPTS);
942: if (m == 0)
943: return ((struct mbuf *)0);
944:
1.13 mycroft 945: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 946:
947: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
948: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
949: OPTSIZ;
950: #ifdef DIAGNOSTIC
951: if (ipprintfs)
1.39 christos 952: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 953: #endif
954:
955: /*
956: * First save first hop for return route
957: */
958: p = &ip_srcrt.route[ip_nhops - 1];
959: *(mtod(m, struct in_addr *)) = *p--;
960: #ifdef DIAGNOSTIC
961: if (ipprintfs)
1.39 christos 962: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 963: #endif
964:
965: /*
966: * Copy option fields and padding (nop) to mbuf.
967: */
968: ip_srcrt.nop = IPOPT_NOP;
969: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
970: bcopy((caddr_t)&ip_srcrt.nop,
971: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
972: q = (struct in_addr *)(mtod(m, caddr_t) +
973: sizeof(struct in_addr) + OPTSIZ);
974: #undef OPTSIZ
975: /*
976: * Record return path as an IP source route,
977: * reversing the path (pointers are now aligned).
978: */
979: while (p >= ip_srcrt.route) {
980: #ifdef DIAGNOSTIC
981: if (ipprintfs)
1.39 christos 982: printf(" %x", ntohl(q->s_addr));
1.1 cgd 983: #endif
984: *q++ = *p--;
985: }
986: /*
987: * Last hop goes to final destination.
988: */
989: *q = ip_srcrt.dst;
990: #ifdef DIAGNOSTIC
991: if (ipprintfs)
1.39 christos 992: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 993: #endif
994: return (m);
995: }
996:
997: /*
998: * Strip out IP options, at higher
999: * level protocol in the kernel.
1000: * Second argument is buffer to which options
1001: * will be moved, and return value is their length.
1002: * XXX should be deleted; last arg currently ignored.
1003: */
1.8 mycroft 1004: void
1.1 cgd 1005: ip_stripoptions(m, mopt)
1006: register struct mbuf *m;
1007: struct mbuf *mopt;
1008: {
1009: register int i;
1010: struct ip *ip = mtod(m, struct ip *);
1011: register caddr_t opts;
1012: int olen;
1013:
1014: olen = (ip->ip_hl<<2) - sizeof (struct ip);
1015: opts = (caddr_t)(ip + 1);
1016: i = m->m_len - (sizeof (struct ip) + olen);
1017: bcopy(opts + olen, opts, (unsigned)i);
1018: m->m_len -= olen;
1019: if (m->m_flags & M_PKTHDR)
1020: m->m_pkthdr.len -= olen;
1021: ip->ip_hl = sizeof(struct ip) >> 2;
1022: }
1023:
1.23 mycroft 1024: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1025: 0, 0, 0, 0,
1026: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1027: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1028: EMSGSIZE, EHOSTUNREACH, 0, 0,
1029: 0, 0, 0, 0,
1030: ENOPROTOOPT
1031: };
1032:
1033: /*
1034: * Forward a packet. If some error occurs return the sender
1035: * an icmp packet. Note we can't always generate a meaningful
1036: * icmp message because icmp doesn't have a large enough repertoire
1037: * of codes and types.
1038: *
1039: * If not forwarding, just drop the packet. This could be confusing
1040: * if ipforwarding was zero but some routing protocol was advancing
1041: * us as a gateway to somewhere. However, we must let the routing
1042: * protocol deal with that.
1043: *
1044: * The srcrt parameter indicates whether the packet is being forwarded
1045: * via a source route.
1046: */
1.13 mycroft 1047: void
1.1 cgd 1048: ip_forward(m, srcrt)
1049: struct mbuf *m;
1050: int srcrt;
1051: {
1052: register struct ip *ip = mtod(m, struct ip *);
1053: register struct sockaddr_in *sin;
1054: register struct rtentry *rt;
1.28 christos 1055: int error, type = 0, code = 0;
1.1 cgd 1056: struct mbuf *mcopy;
1.13 mycroft 1057: n_long dest;
1058: struct ifnet *destifp;
1.1 cgd 1059:
1.13 mycroft 1060: dest = 0;
1.1 cgd 1061: #ifdef DIAGNOSTIC
1062: if (ipprintfs)
1.39 christos 1063: printf("forward: src %x dst %x ttl %x\n",
1.35 mycroft 1064: ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl);
1.1 cgd 1065: #endif
1066: if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) {
1067: ipstat.ips_cantforward++;
1068: m_freem(m);
1069: return;
1070: }
1071: HTONS(ip->ip_id);
1072: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1073: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1074: return;
1075: }
1076: ip->ip_ttl -= IPTTLDEC;
1077:
1.19 mycroft 1078: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1079: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1080: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1081: if (ipforward_rt.ro_rt) {
1082: RTFREE(ipforward_rt.ro_rt);
1083: ipforward_rt.ro_rt = 0;
1084: }
1085: sin->sin_family = AF_INET;
1.35 mycroft 1086: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1087: sin->sin_addr = ip->ip_dst;
1088:
1089: rtalloc(&ipforward_rt);
1090: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1091: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1092: return;
1093: }
1094: rt = ipforward_rt.ro_rt;
1095: }
1096:
1097: /*
1.34 mycroft 1098: * Save at most 68 bytes of the packet in case
1.1 cgd 1099: * we need to generate an ICMP message to the src.
1100: */
1.34 mycroft 1101: mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1 cgd 1102:
1103: /*
1104: * If forwarding packet using same interface that it came in on,
1105: * perhaps should send a redirect to sender to shortcut a hop.
1106: * Only send redirect if source is sending directly to us,
1107: * and if packet was not source routed (or has any options).
1108: * Also, don't send redirect if forwarding using a default route
1109: * or a route modified by a redirect.
1110: */
1111: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1112: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1113: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1114: ipsendredirects && !srcrt) {
1.19 mycroft 1115: if (rt->rt_ifa &&
1116: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1117: ifatoia(rt->rt_ifa)->ia_subnet) {
1.1 cgd 1118: if (rt->rt_flags & RTF_GATEWAY)
1.13 mycroft 1119: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1.1 cgd 1120: else
1.13 mycroft 1121: dest = ip->ip_dst.s_addr;
1122: /* Router requirements says to only send host redirects */
1.1 cgd 1123: type = ICMP_REDIRECT;
1.13 mycroft 1124: code = ICMP_REDIRECT_HOST;
1.1 cgd 1125: #ifdef DIAGNOSTIC
1126: if (ipprintfs)
1.39 christos 1127: printf("redirect (%d) to %x\n", code, (u_int32_t)dest);
1.1 cgd 1128: #endif
1129: }
1130: }
1131:
1.27 thorpej 1132: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1133: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1134: if (error)
1135: ipstat.ips_cantforward++;
1136: else {
1137: ipstat.ips_forward++;
1138: if (type)
1139: ipstat.ips_redirectsent++;
1140: else {
1141: if (mcopy)
1142: m_freem(mcopy);
1143: return;
1144: }
1145: }
1146: if (mcopy == NULL)
1147: return;
1.13 mycroft 1148: destifp = NULL;
1149:
1.1 cgd 1150: switch (error) {
1151:
1152: case 0: /* forwarded, but need redirect */
1153: /* type, code set above */
1154: break;
1155:
1156: case ENETUNREACH: /* shouldn't happen, checked above */
1157: case EHOSTUNREACH:
1158: case ENETDOWN:
1159: case EHOSTDOWN:
1160: default:
1161: type = ICMP_UNREACH;
1162: code = ICMP_UNREACH_HOST;
1163: break;
1164:
1165: case EMSGSIZE:
1166: type = ICMP_UNREACH;
1167: code = ICMP_UNREACH_NEEDFRAG;
1.13 mycroft 1168: if (ipforward_rt.ro_rt)
1169: destifp = ipforward_rt.ro_rt->rt_ifp;
1.1 cgd 1170: ipstat.ips_cantfrag++;
1171: break;
1172:
1173: case ENOBUFS:
1174: type = ICMP_SOURCEQUENCH;
1175: code = 0;
1176: break;
1177: }
1.13 mycroft 1178: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1179: }
1180:
1181: void
1182: ip_savecontrol(inp, mp, ip, m)
1183: register struct inpcb *inp;
1184: register struct mbuf **mp;
1185: register struct ip *ip;
1186: register struct mbuf *m;
1187: {
1188:
1189: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1190: struct timeval tv;
1191:
1192: microtime(&tv);
1193: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1194: SCM_TIMESTAMP, SOL_SOCKET);
1195: if (*mp)
1196: mp = &(*mp)->m_next;
1197: }
1198: if (inp->inp_flags & INP_RECVDSTADDR) {
1199: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1200: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1201: if (*mp)
1202: mp = &(*mp)->m_next;
1203: }
1204: #ifdef notyet
1205: /*
1206: * XXX
1207: * Moving these out of udp_input() made them even more broken
1208: * than they already were.
1209: * - fenner@parc.xerox.com
1210: */
1211: /* options were tossed already */
1212: if (inp->inp_flags & INP_RECVOPTS) {
1213: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1214: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1215: if (*mp)
1216: mp = &(*mp)->m_next;
1217: }
1218: /* ip_srcroute doesn't do what we want here, need to fix */
1219: if (inp->inp_flags & INP_RECVRETOPTS) {
1220: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1221: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1222: if (*mp)
1223: mp = &(*mp)->m_next;
1224: }
1225: #endif
1226: if (inp->inp_flags & INP_RECVIF) {
1227: struct sockaddr_dl sdl;
1228:
1229: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1230: sdl.sdl_family = AF_LINK;
1231: sdl.sdl_index = m->m_pkthdr.rcvif ?
1232: m->m_pkthdr.rcvif->if_index : 0;
1233: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1234: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1235: IP_RECVIF, IPPROTO_IP);
1236: if (*mp)
1237: mp = &(*mp)->m_next;
1238: }
1.13 mycroft 1239: }
1240:
1241: int
1242: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1243: int *name;
1244: u_int namelen;
1245: void *oldp;
1246: size_t *oldlenp;
1247: void *newp;
1248: size_t newlen;
1249: {
1.52 thorpej 1250: extern int subnetsarelocal;
1251:
1.54 ! lukem 1252: int error, old;
! 1253:
1.13 mycroft 1254: /* All sysctl names at this level are terminal. */
1255: if (namelen != 1)
1256: return (ENOTDIR);
1257:
1258: switch (name[0]) {
1259: case IPCTL_FORWARDING:
1260: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1261: case IPCTL_SENDREDIRECTS:
1262: return (sysctl_int(oldp, oldlenp, newp, newlen,
1263: &ipsendredirects));
1264: case IPCTL_DEFTTL:
1265: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1266: #ifdef notyet
1267: case IPCTL_DEFMTU:
1268: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1269: #endif
1.26 thorpej 1270: case IPCTL_FORWSRCRT:
1.47 cjs 1271: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1272: if (securelevel > 0)
1.46 cjs 1273: return (sysctl_rdint(oldp, oldlenp, newp,
1274: ip_forwsrcrt));
1275: else
1276: return (sysctl_int(oldp, oldlenp, newp, newlen,
1277: &ip_forwsrcrt));
1.27 thorpej 1278: case IPCTL_DIRECTEDBCAST:
1279: return (sysctl_int(oldp, oldlenp, newp, newlen,
1280: &ip_directedbcast));
1.47 cjs 1281: case IPCTL_ALLOWSRCRT:
1282: return (sysctl_int(oldp, oldlenp, newp, newlen,
1283: &ip_allowsrcrt));
1.52 thorpej 1284: case IPCTL_SUBNETSARELOCAL:
1285: return (sysctl_int(oldp, oldlenp, newp, newlen,
1286: &subnetsarelocal));
1.53 kml 1287: case IPCTL_MTUDISC:
1.54 ! lukem 1288: return (sysctl_int(oldp, oldlenp, newp, newlen,
1.53 kml 1289: &ip_mtudisc));
1.54 ! lukem 1290: case IPCTL_ANONPORTMIN:
! 1291: old = anonportmin;
! 1292: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
! 1293: if (anonportmin >= anonportmax || anonportmin > 65535
! 1294: #ifndef IPNOPRIVPORTS
! 1295: || anonportmin < IPPORT_RESERVED
! 1296: #endif
! 1297: ) {
! 1298: anonportmin = old;
! 1299: return (EINVAL);
! 1300: }
! 1301: return (error);
! 1302: case IPCTL_ANONPORTMAX:
! 1303: old = anonportmax;
! 1304: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
! 1305: if (anonportmin >= anonportmax || anonportmax > 65535
! 1306: #ifndef IPNOPRIVPORTS
! 1307: || anonportmax < IPPORT_RESERVED
! 1308: #endif
! 1309: ) {
! 1310: anonportmax = old;
! 1311: return (EINVAL);
! 1312: }
! 1313: return (error);
1.13 mycroft 1314: default:
1315: return (EOPNOTSUPP);
1316: }
1317: /* NOTREACHED */
1.1 cgd 1318: }
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