Annotation of src/sys/netinet/ip_input.c, Revision 1.55
1.55 ! scottr 1: /* $NetBSD: ip_input.c,v 1.54 1998/01/05 09:52:04 lukem 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: */
1.55 ! scottr 37:
! 38: #include "opt_mrouting.h"
1.1 cgd 39:
1.5 mycroft 40: #include <sys/param.h>
41: #include <sys/systm.h>
42: #include <sys/malloc.h>
43: #include <sys/mbuf.h>
44: #include <sys/domain.h>
45: #include <sys/protosw.h>
46: #include <sys/socket.h>
1.44 thorpej 47: #include <sys/socketvar.h>
1.5 mycroft 48: #include <sys/errno.h>
49: #include <sys/time.h>
50: #include <sys/kernel.h>
1.28 christos 51: #include <sys/proc.h>
52:
53: #include <vm/vm.h>
54: #include <sys/sysctl.h>
1.1 cgd 55:
1.5 mycroft 56: #include <net/if.h>
1.44 thorpej 57: #include <net/if_dl.h>
1.5 mycroft 58: #include <net/route.h>
1.45 mrg 59: #include <net/pfil.h>
1.1 cgd 60:
1.5 mycroft 61: #include <netinet/in.h>
62: #include <netinet/in_systm.h>
63: #include <netinet/ip.h>
64: #include <netinet/in_pcb.h>
65: #include <netinet/in_var.h>
66: #include <netinet/ip_var.h>
67: #include <netinet/ip_icmp.h>
1.36 mrg 68:
1.44 thorpej 69: /* XXX should really put this in libkern.h */
70: #define offsetof(type, member) ((size_t)(&((type *)0)->member))
71:
1.1 cgd 72: #ifndef IPFORWARDING
73: #ifdef GATEWAY
74: #define IPFORWARDING 1 /* forward IP packets not for us */
75: #else /* GATEWAY */
76: #define IPFORWARDING 0 /* don't forward IP packets not for us */
77: #endif /* GATEWAY */
78: #endif /* IPFORWARDING */
79: #ifndef IPSENDREDIRECTS
80: #define IPSENDREDIRECTS 1
81: #endif
1.26 thorpej 82: #ifndef IPFORWSRCRT
1.47 cjs 83: #define IPFORWSRCRT 1 /* forward source-routed packets */
84: #endif
85: #ifndef IPALLOWSRCRT
1.48 mrg 86: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 87: #endif
1.53 kml 88: #ifndef IPMTUDISC
89: #define IPMTUDISC 0
90: #endif
91:
1.27 thorpej 92: /*
93: * Note: DIRECTED_BROADCAST is handled this way so that previous
94: * configuration using this option will Just Work.
95: */
96: #ifndef IPDIRECTEDBCAST
97: #ifdef DIRECTED_BROADCAST
98: #define IPDIRECTEDBCAST 1
99: #else
100: #define IPDIRECTEDBCAST 0
101: #endif /* DIRECTED_BROADCAST */
102: #endif /* IPDIRECTEDBCAST */
1.1 cgd 103: int ipforwarding = IPFORWARDING;
104: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 105: int ip_defttl = IPDEFTTL;
1.26 thorpej 106: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 107: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 108: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 109: int ip_mtudisc = IPMTUDISC;
1.1 cgd 110: #ifdef DIAGNOSTIC
111: int ipprintfs = 0;
112: #endif
113:
114: extern struct domain inetdomain;
115: extern struct protosw inetsw[];
116: u_char ip_protox[IPPROTO_MAX];
117: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 118: struct in_ifaddrhead in_ifaddr;
1.13 mycroft 119: struct ifqueue ipintrq;
1.1 cgd 120:
121: /*
122: * We need to save the IP options in case a protocol wants to respond
123: * to an incoming packet over the same route if the packet got here
124: * using IP source routing. This allows connection establishment and
125: * maintenance when the remote end is on a network that is not known
126: * to us.
127: */
128: int ip_nhops = 0;
129: static struct ip_srcrt {
130: struct in_addr dst; /* final destination */
131: char nop; /* one NOP to align */
132: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
133: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
134: } ip_srcrt;
135:
1.13 mycroft 136: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 137:
1.1 cgd 138: /*
139: * IP initialization: fill in IP protocol switch table.
140: * All protocols not implemented in kernel go to raw IP protocol handler.
141: */
1.8 mycroft 142: void
1.1 cgd 143: ip_init()
144: {
145: register struct protosw *pr;
146: register int i;
147:
148: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
149: if (pr == 0)
150: panic("ip_init");
151: for (i = 0; i < IPPROTO_MAX; i++)
152: ip_protox[i] = pr - inetsw;
153: for (pr = inetdomain.dom_protosw;
154: pr < inetdomain.dom_protoswNPROTOSW; pr++)
155: if (pr->pr_domain->dom_family == PF_INET &&
156: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
157: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 158: LIST_INIT(&ipq);
1.1 cgd 159: ip_id = time.tv_sec & 0xffff;
160: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 161: TAILQ_INIT(&in_ifaddr);
1.1 cgd 162: }
163:
164: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
165: struct route ipforward_rt;
166:
167: /*
168: * Ip input routine. Checksum and byte swap header. If fragmented
169: * try to reassemble. Process options. Pass to next level.
170: */
1.8 mycroft 171: void
1.1 cgd 172: ipintr()
173: {
1.33 mrg 174: register struct ip *ip = NULL;
1.1 cgd 175: register struct mbuf *m;
176: register struct ipq *fp;
177: register struct in_ifaddr *ia;
1.25 cgd 178: struct ipqent *ipqe;
1.35 mycroft 179: int hlen = 0, mff, len, s;
1.36 mrg 180: #ifdef PFIL_HOOKS
1.33 mrg 181: struct packet_filter_hook *pfh;
182: struct mbuf *m0;
1.43 mrg 183: int rv;
1.36 mrg 184: #endif /* PFIL_HOOKS */
1.1 cgd 185:
186: next:
187: /*
188: * Get next datagram off input queue and get IP header
189: * in first mbuf.
190: */
191: s = splimp();
192: IF_DEQUEUE(&ipintrq, m);
193: splx(s);
1.13 mycroft 194: if (m == 0)
1.1 cgd 195: return;
196: #ifdef DIAGNOSTIC
197: if ((m->m_flags & M_PKTHDR) == 0)
198: panic("ipintr no HDR");
199: #endif
200: /*
201: * If no IP addresses have been set yet but the interfaces
202: * are receiving, can't do anything with incoming packets yet.
203: */
1.22 mycroft 204: if (in_ifaddr.tqh_first == 0)
1.1 cgd 205: goto bad;
206: ipstat.ips_total++;
207: if (m->m_len < sizeof (struct ip) &&
208: (m = m_pullup(m, sizeof (struct ip))) == 0) {
209: ipstat.ips_toosmall++;
210: goto next;
211: }
212: ip = mtod(m, struct ip *);
1.13 mycroft 213: if (ip->ip_v != IPVERSION) {
214: ipstat.ips_badvers++;
215: goto bad;
216: }
1.1 cgd 217: hlen = ip->ip_hl << 2;
218: if (hlen < sizeof(struct ip)) { /* minimum header length */
219: ipstat.ips_badhlen++;
220: goto bad;
221: }
222: if (hlen > m->m_len) {
223: if ((m = m_pullup(m, hlen)) == 0) {
224: ipstat.ips_badhlen++;
225: goto next;
226: }
227: ip = mtod(m, struct ip *);
228: }
1.28 christos 229: if ((ip->ip_sum = in_cksum(m, hlen)) != 0) {
1.1 cgd 230: ipstat.ips_badsum++;
231: goto bad;
232: }
233:
234: /*
235: * Convert fields to host representation.
236: */
237: NTOHS(ip->ip_len);
238: NTOHS(ip->ip_id);
239: NTOHS(ip->ip_off);
1.35 mycroft 240: len = ip->ip_len;
1.1 cgd 241:
242: /*
243: * Check that the amount of data in the buffers
244: * is as at least much as the IP header would have us expect.
245: * Trim mbufs if longer than we expect.
246: * Drop packet if shorter than we expect.
247: */
1.35 mycroft 248: if (m->m_pkthdr.len < len) {
1.1 cgd 249: ipstat.ips_tooshort++;
250: goto bad;
251: }
1.35 mycroft 252: if (m->m_pkthdr.len > len) {
1.1 cgd 253: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 254: m->m_len = len;
255: m->m_pkthdr.len = len;
1.1 cgd 256: } else
1.35 mycroft 257: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 258: }
259:
1.36 mrg 260: #ifdef PFIL_HOOKS
1.33 mrg 261: /*
262: * Run through list of hooks for input packets.
263: */
264: m0 = m;
265: for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.le_next)
266: if (pfh->pfil_func) {
1.43 mrg 267: rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0);
268: if (rv)
1.40 veego 269: goto next;
1.49 christos 270: ip = mtod(m = m0, struct ip *);
1.33 mrg 271: }
1.36 mrg 272: #endif /* PFIL_HOOKS */
1.33 mrg 273:
1.1 cgd 274: /*
275: * Process options and, if not destined for us,
276: * ship it on. ip_dooptions returns 1 when an
277: * error was detected (causing an icmp message
278: * to be sent and the original packet to be freed).
279: */
280: ip_nhops = 0; /* for source routed packets */
281: if (hlen > sizeof (struct ip) && ip_dooptions(m))
282: goto next;
283:
284: /*
285: * Check our list of addresses, to see if the packet is for us.
286: */
1.22 mycroft 287: for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) {
1.35 mycroft 288: if (in_hosteq(ip->ip_dst, ia->ia_addr.sin_addr))
1.1 cgd 289: goto ours;
1.27 thorpej 290: if (((ip_directedbcast == 0) || (ip_directedbcast &&
291: ia->ia_ifp == m->m_pkthdr.rcvif)) &&
1.1 cgd 292: (ia->ia_ifp->if_flags & IFF_BROADCAST)) {
1.35 mycroft 293: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
294: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 295: /*
296: * Look for all-0's host part (old broadcast addr),
297: * either for subnet or net.
298: */
299: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 300: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 301: goto ours;
302: }
1.51 gwr 303: /*
304: * An interface with IP address zero accepts
305: * all packets that arrive on that interface.
306: */
307: if ((ia->ia_ifp == m->m_pkthdr.rcvif) &&
308: in_nullhost(ia->ia_addr.sin_addr))
309: goto ours;
1.1 cgd 310: }
1.18 mycroft 311: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 312: struct in_multi *inm;
313: #ifdef MROUTING
314: extern struct socket *ip_mrouter;
1.10 brezak 315:
316: if (m->m_flags & M_EXT) {
317: if ((m = m_pullup(m, hlen)) == 0) {
318: ipstat.ips_toosmall++;
319: goto next;
320: }
321: ip = mtod(m, struct ip *);
322: }
1.4 hpeyerl 323:
324: if (ip_mrouter) {
325: /*
326: * If we are acting as a multicast router, all
327: * incoming multicast packets are passed to the
328: * kernel-level multicast forwarding function.
329: * The packet is returned (relatively) intact; if
330: * ip_mforward() returns a non-zero value, the packet
331: * must be discarded, else it may be accepted below.
332: *
333: * (The IP ident field is put in the same byte order
334: * as expected when ip_mforward() is called from
335: * ip_output().)
336: */
337: ip->ip_id = htons(ip->ip_id);
1.13 mycroft 338: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
339: ipstat.ips_cantforward++;
1.4 hpeyerl 340: m_freem(m);
341: goto next;
342: }
343: ip->ip_id = ntohs(ip->ip_id);
344:
345: /*
346: * The process-level routing demon needs to receive
347: * all multicast IGMP packets, whether or not this
348: * host belongs to their destination groups.
349: */
350: if (ip->ip_p == IPPROTO_IGMP)
351: goto ours;
1.13 mycroft 352: ipstat.ips_forward++;
1.4 hpeyerl 353: }
354: #endif
355: /*
356: * See if we belong to the destination multicast group on the
357: * arrival interface.
358: */
359: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
360: if (inm == NULL) {
1.13 mycroft 361: ipstat.ips_cantforward++;
1.4 hpeyerl 362: m_freem(m);
363: goto next;
364: }
365: goto ours;
366: }
1.19 mycroft 367: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 368: in_nullhost(ip->ip_dst))
1.1 cgd 369: goto ours;
370:
371: /*
372: * Not for us; forward if possible and desirable.
373: */
374: if (ipforwarding == 0) {
375: ipstat.ips_cantforward++;
376: m_freem(m);
377: } else
378: ip_forward(m, 0);
379: goto next;
380:
381: ours:
382: /*
383: * If offset or IP_MF are set, must reassemble.
384: * Otherwise, nothing need be done.
385: * (We could look in the reassembly queue to see
386: * if the packet was previously fragmented,
387: * but it's not worth the time; just let them time out.)
388: */
1.37 perry 389: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 390: /*
391: * Look for queue of fragments
392: * of this datagram.
393: */
1.25 cgd 394: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 395: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 396: in_hosteq(ip->ip_src, fp->ipq_src) &&
397: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 398: ip->ip_p == fp->ipq_p)
399: goto found;
400: fp = 0;
401: found:
402:
403: /*
404: * Adjust ip_len to not reflect header,
1.25 cgd 405: * set ipqe_mff if more fragments are expected,
1.1 cgd 406: * convert offset of this to bytes.
407: */
408: ip->ip_len -= hlen;
1.25 cgd 409: mff = (ip->ip_off & IP_MF) != 0;
410: if (mff) {
1.16 cgd 411: /*
412: * Make sure that fragments have a data length
413: * that's a non-zero multiple of 8 bytes.
414: */
1.17 cgd 415: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 416: ipstat.ips_badfrags++;
417: goto bad;
418: }
419: }
1.1 cgd 420: ip->ip_off <<= 3;
421:
422: /*
423: * If datagram marked as having more fragments
424: * or if this is not the first fragment,
425: * attempt reassembly; if it succeeds, proceed.
426: */
1.25 cgd 427: if (mff || ip->ip_off) {
1.1 cgd 428: ipstat.ips_fragments++;
1.25 cgd 429: MALLOC(ipqe, struct ipqent *, sizeof (struct ipqent),
430: M_IPQ, M_NOWAIT);
431: if (ipqe == NULL) {
432: ipstat.ips_rcvmemdrop++;
433: goto bad;
434: }
435: ipqe->ipqe_mff = mff;
1.50 thorpej 436: ipqe->ipqe_m = m;
1.25 cgd 437: ipqe->ipqe_ip = ip;
1.50 thorpej 438: m = ip_reass(ipqe, fp);
439: if (m == 0)
1.1 cgd 440: goto next;
1.13 mycroft 441: ipstat.ips_reassembled++;
1.50 thorpej 442: ip = mtod(m, struct ip *);
1.1 cgd 443: } else
444: if (fp)
445: ip_freef(fp);
446: } else
447: ip->ip_len -= hlen;
448:
449: /*
450: * Switch out to protocol's input routine.
451: */
452: ipstat.ips_delivered++;
453: (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
454: goto next;
455: bad:
456: m_freem(m);
457: goto next;
458: }
459:
460: /*
461: * Take incoming datagram fragment and try to
462: * reassemble it into whole datagram. If a chain for
463: * reassembly of this datagram already exists, then it
464: * is given as fp; otherwise have to make a chain.
465: */
1.50 thorpej 466: struct mbuf *
1.25 cgd 467: ip_reass(ipqe, fp)
468: register struct ipqent *ipqe;
1.1 cgd 469: register struct ipq *fp;
470: {
1.50 thorpej 471: register struct mbuf *m = ipqe->ipqe_m;
1.25 cgd 472: register struct ipqent *nq, *p, *q;
473: struct ip *ip;
1.1 cgd 474: struct mbuf *t;
1.25 cgd 475: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 476: int i, next;
477:
478: /*
479: * Presence of header sizes in mbufs
480: * would confuse code below.
481: */
482: m->m_data += hlen;
483: m->m_len -= hlen;
484:
485: /*
486: * If first fragment to arrive, create a reassembly queue.
487: */
488: if (fp == 0) {
1.50 thorpej 489: MALLOC(fp, struct ipq *, sizeof (struct ipq),
490: M_FTABLE, M_NOWAIT);
491: if (fp == NULL)
1.1 cgd 492: goto dropfrag;
1.25 cgd 493: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 494: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 495: fp->ipq_p = ipqe->ipqe_ip->ip_p;
496: fp->ipq_id = ipqe->ipqe_ip->ip_id;
497: LIST_INIT(&fp->ipq_fragq);
498: fp->ipq_src = ipqe->ipqe_ip->ip_src;
499: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
500: p = NULL;
1.1 cgd 501: goto insert;
502: }
503:
504: /*
505: * Find a segment which begins after this one does.
506: */
1.25 cgd 507: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
508: p = q, q = q->ipqe_q.le_next)
509: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 510: break;
511:
512: /*
513: * If there is a preceding segment, it may provide some of
514: * our data already. If so, drop the data from the incoming
515: * segment. If it provides all of our data, drop us.
516: */
1.25 cgd 517: if (p != NULL) {
518: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
519: ipqe->ipqe_ip->ip_off;
1.1 cgd 520: if (i > 0) {
1.25 cgd 521: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 522: goto dropfrag;
1.50 thorpej 523: m_adj(ipqe->ipqe_m, i);
1.25 cgd 524: ipqe->ipqe_ip->ip_off += i;
525: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 526: }
527: }
528:
529: /*
530: * While we overlap succeeding segments trim them or,
531: * if they are completely covered, dequeue them.
532: */
1.25 cgd 533: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
534: q->ipqe_ip->ip_off; q = nq) {
535: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
536: q->ipqe_ip->ip_off;
537: if (i < q->ipqe_ip->ip_len) {
538: q->ipqe_ip->ip_len -= i;
539: q->ipqe_ip->ip_off += i;
1.50 thorpej 540: m_adj(q->ipqe_m, i);
1.1 cgd 541: break;
542: }
1.25 cgd 543: nq = q->ipqe_q.le_next;
1.50 thorpej 544: m_freem(q->ipqe_m);
1.25 cgd 545: LIST_REMOVE(q, ipqe_q);
546: FREE(q, M_IPQ);
1.1 cgd 547: }
548:
549: insert:
550: /*
551: * Stick new segment in its place;
552: * check for complete reassembly.
553: */
1.25 cgd 554: if (p == NULL) {
555: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
556: } else {
557: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
558: }
1.1 cgd 559: next = 0;
1.25 cgd 560: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
561: p = q, q = q->ipqe_q.le_next) {
562: if (q->ipqe_ip->ip_off != next)
1.1 cgd 563: return (0);
1.25 cgd 564: next += q->ipqe_ip->ip_len;
1.1 cgd 565: }
1.25 cgd 566: if (p->ipqe_mff)
1.1 cgd 567: return (0);
568:
569: /*
1.41 thorpej 570: * Reassembly is complete. Check for a bogus message size and
571: * concatenate fragments.
1.1 cgd 572: */
1.25 cgd 573: q = fp->ipq_fragq.lh_first;
574: ip = q->ipqe_ip;
1.41 thorpej 575: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
576: ipstat.ips_toolong++;
577: ip_freef(fp);
578: return (0);
579: }
1.50 thorpej 580: m = q->ipqe_m;
1.1 cgd 581: t = m->m_next;
582: m->m_next = 0;
583: m_cat(m, t);
1.25 cgd 584: nq = q->ipqe_q.le_next;
585: FREE(q, M_IPQ);
586: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 587: t = q->ipqe_m;
1.25 cgd 588: nq = q->ipqe_q.le_next;
589: FREE(q, M_IPQ);
1.1 cgd 590: m_cat(m, t);
591: }
592:
593: /*
594: * Create header for new ip packet by
595: * modifying header of first packet;
596: * dequeue and discard fragment reassembly header.
597: * Make header visible.
598: */
599: ip->ip_len = next;
1.25 cgd 600: ip->ip_src = fp->ipq_src;
601: ip->ip_dst = fp->ipq_dst;
602: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 603: FREE(fp, M_FTABLE);
1.1 cgd 604: m->m_len += (ip->ip_hl << 2);
605: m->m_data -= (ip->ip_hl << 2);
606: /* some debugging cruft by sklower, below, will go away soon */
607: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
608: register int plen = 0;
1.50 thorpej 609: for (t = m; t; t = t->m_next)
610: plen += t->m_len;
611: m->m_pkthdr.len = plen;
1.1 cgd 612: }
1.50 thorpej 613: return (m);
1.1 cgd 614:
615: dropfrag:
616: ipstat.ips_fragdropped++;
617: m_freem(m);
1.25 cgd 618: FREE(ipqe, M_IPQ);
1.1 cgd 619: return (0);
620: }
621:
622: /*
623: * Free a fragment reassembly header and all
624: * associated datagrams.
625: */
1.8 mycroft 626: void
1.1 cgd 627: ip_freef(fp)
628: struct ipq *fp;
629: {
1.25 cgd 630: register struct ipqent *q, *p;
1.1 cgd 631:
1.25 cgd 632: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
633: p = q->ipqe_q.le_next;
1.50 thorpej 634: m_freem(q->ipqe_m);
1.25 cgd 635: LIST_REMOVE(q, ipqe_q);
636: FREE(q, M_IPQ);
1.1 cgd 637: }
1.25 cgd 638: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 639: FREE(fp, M_FTABLE);
1.1 cgd 640: }
641:
642: /*
643: * IP timer processing;
644: * if a timer expires on a reassembly
645: * queue, discard it.
646: */
1.8 mycroft 647: void
1.1 cgd 648: ip_slowtimo()
649: {
1.25 cgd 650: register struct ipq *fp, *nfp;
1.24 mycroft 651: int s = splsoftnet();
1.1 cgd 652:
1.25 cgd 653: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
654: nfp = fp->ipq_q.le_next;
655: if (--fp->ipq_ttl == 0) {
1.1 cgd 656: ipstat.ips_fragtimeout++;
1.25 cgd 657: ip_freef(fp);
1.1 cgd 658: }
659: }
660: splx(s);
661: }
662:
663: /*
664: * Drain off all datagram fragments.
665: */
1.8 mycroft 666: void
1.1 cgd 667: ip_drain()
668: {
669:
1.25 cgd 670: while (ipq.lh_first != NULL) {
1.1 cgd 671: ipstat.ips_fragdropped++;
1.25 cgd 672: ip_freef(ipq.lh_first);
1.1 cgd 673: }
674: }
675:
676: /*
677: * Do option processing on a datagram,
678: * possibly discarding it if bad options are encountered,
679: * or forwarding it if source-routed.
680: * Returns 1 if packet has been forwarded/freed,
681: * 0 if the packet should be processed further.
682: */
1.8 mycroft 683: int
1.1 cgd 684: ip_dooptions(m)
685: struct mbuf *m;
686: {
687: register struct ip *ip = mtod(m, struct ip *);
688: register u_char *cp;
689: register struct ip_timestamp *ipt;
690: register struct in_ifaddr *ia;
691: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.13 mycroft 692: struct in_addr *sin, dst;
1.1 cgd 693: n_time ntime;
694:
1.13 mycroft 695: dst = ip->ip_dst;
1.1 cgd 696: cp = (u_char *)(ip + 1);
697: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
698: for (; cnt > 0; cnt -= optlen, cp += optlen) {
699: opt = cp[IPOPT_OPTVAL];
700: if (opt == IPOPT_EOL)
701: break;
702: if (opt == IPOPT_NOP)
703: optlen = 1;
704: else {
705: optlen = cp[IPOPT_OLEN];
706: if (optlen <= 0 || optlen > cnt) {
707: code = &cp[IPOPT_OLEN] - (u_char *)ip;
708: goto bad;
709: }
710: }
711: switch (opt) {
712:
713: default:
714: break;
715:
716: /*
717: * Source routing with record.
718: * Find interface with current destination address.
719: * If none on this machine then drop if strictly routed,
720: * or do nothing if loosely routed.
721: * Record interface address and bring up next address
722: * component. If strictly routed make sure next
723: * address is on directly accessible net.
724: */
725: case IPOPT_LSRR:
726: case IPOPT_SSRR:
1.47 cjs 727: if (ip_allowsrcrt == 0) {
728: type = ICMP_UNREACH;
729: code = ICMP_UNREACH_NET_PROHIB;
730: goto bad;
731: }
1.1 cgd 732: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
733: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
734: goto bad;
735: }
736: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 737: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 738: if (ia == 0) {
739: if (opt == IPOPT_SSRR) {
740: type = ICMP_UNREACH;
741: code = ICMP_UNREACH_SRCFAIL;
742: goto bad;
743: }
744: /*
745: * Loose routing, and not at next destination
746: * yet; nothing to do except forward.
747: */
748: break;
749: }
750: off--; /* 0 origin */
751: if (off > optlen - sizeof(struct in_addr)) {
752: /*
753: * End of source route. Should be for us.
754: */
755: save_rte(cp, ip->ip_src);
756: break;
757: }
758: /*
759: * locate outgoing interface
760: */
761: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
762: sizeof(ipaddr.sin_addr));
763: if (opt == IPOPT_SSRR) {
764: #define INA struct in_ifaddr *
765: #define SA struct sockaddr *
1.29 mrg 766: ia = (INA)ifa_ifwithladdr((SA)&ipaddr);
1.1 cgd 767: } else
768: ia = ip_rtaddr(ipaddr.sin_addr);
769: if (ia == 0) {
770: type = ICMP_UNREACH;
771: code = ICMP_UNREACH_SRCFAIL;
772: goto bad;
773: }
774: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 775: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 776: (caddr_t)(cp + off), sizeof(struct in_addr));
777: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 778: /*
779: * Let ip_intr's mcast routing check handle mcast pkts
780: */
1.18 mycroft 781: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 782: break;
783:
784: case IPOPT_RR:
785: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
786: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
787: goto bad;
788: }
789: /*
790: * If no space remains, ignore.
791: */
792: off--; /* 0 origin */
793: if (off > optlen - sizeof(struct in_addr))
794: break;
795: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
796: sizeof(ipaddr.sin_addr));
797: /*
798: * locate outgoing interface; if we're the destination,
799: * use the incoming interface (should be same).
800: */
801: if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
802: (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
803: type = ICMP_UNREACH;
804: code = ICMP_UNREACH_HOST;
805: goto bad;
806: }
1.20 mycroft 807: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 808: (caddr_t)(cp + off), sizeof(struct in_addr));
809: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
810: break;
811:
812: case IPOPT_TS:
813: code = cp - (u_char *)ip;
814: ipt = (struct ip_timestamp *)cp;
815: if (ipt->ipt_len < 5)
816: goto bad;
1.15 cgd 817: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1 cgd 818: if (++ipt->ipt_oflw == 0)
819: goto bad;
820: break;
821: }
822: sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
823: switch (ipt->ipt_flg) {
824:
825: case IPOPT_TS_TSONLY:
826: break;
827:
828: case IPOPT_TS_TSANDADDR:
829: if (ipt->ipt_ptr + sizeof(n_time) +
830: sizeof(struct in_addr) > ipt->ipt_len)
831: goto bad;
1.13 mycroft 832: ipaddr.sin_addr = dst;
833: ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
834: m->m_pkthdr.rcvif);
835: if (ia == 0)
836: continue;
1.20 mycroft 837: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 838: (caddr_t)sin, sizeof(struct in_addr));
839: ipt->ipt_ptr += sizeof(struct in_addr);
840: break;
841:
842: case IPOPT_TS_PRESPEC:
843: if (ipt->ipt_ptr + sizeof(n_time) +
844: sizeof(struct in_addr) > ipt->ipt_len)
845: goto bad;
846: bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
847: sizeof(struct in_addr));
848: if (ifa_ifwithaddr((SA)&ipaddr) == 0)
849: continue;
850: ipt->ipt_ptr += sizeof(struct in_addr);
851: break;
852:
853: default:
854: goto bad;
855: }
856: ntime = iptime();
857: bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
858: sizeof(n_time));
859: ipt->ipt_ptr += sizeof(n_time);
860: }
861: }
862: if (forward) {
1.26 thorpej 863: if (ip_forwsrcrt == 0) {
864: type = ICMP_UNREACH;
865: code = ICMP_UNREACH_SRCFAIL;
866: goto bad;
867: }
1.1 cgd 868: ip_forward(m, 1);
869: return (1);
1.13 mycroft 870: }
871: return (0);
1.1 cgd 872: bad:
1.13 mycroft 873: ip->ip_len -= ip->ip_hl << 2; /* XXX icmp_error adds in hdr length */
874: icmp_error(m, type, code, 0, 0);
875: ipstat.ips_badoptions++;
1.1 cgd 876: return (1);
877: }
878:
879: /*
880: * Given address of next destination (final or next hop),
881: * return internet address info of interface to be used to get there.
882: */
883: struct in_ifaddr *
884: ip_rtaddr(dst)
885: struct in_addr dst;
886: {
887: register struct sockaddr_in *sin;
888:
1.19 mycroft 889: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 890:
1.35 mycroft 891: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 892: if (ipforward_rt.ro_rt) {
893: RTFREE(ipforward_rt.ro_rt);
894: ipforward_rt.ro_rt = 0;
895: }
896: sin->sin_family = AF_INET;
897: sin->sin_len = sizeof(*sin);
898: sin->sin_addr = dst;
899:
900: rtalloc(&ipforward_rt);
901: }
902: if (ipforward_rt.ro_rt == 0)
903: return ((struct in_ifaddr *)0);
1.19 mycroft 904: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 905: }
906:
907: /*
908: * Save incoming source route for use in replies,
909: * to be picked up later by ip_srcroute if the receiver is interested.
910: */
1.13 mycroft 911: void
1.1 cgd 912: save_rte(option, dst)
913: u_char *option;
914: struct in_addr dst;
915: {
916: unsigned olen;
917:
918: olen = option[IPOPT_OLEN];
919: #ifdef DIAGNOSTIC
920: if (ipprintfs)
1.39 christos 921: printf("save_rte: olen %d\n", olen);
1.1 cgd 922: #endif
923: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
924: return;
925: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
926: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
927: ip_srcrt.dst = dst;
928: }
929:
930: /*
931: * Retrieve incoming source route for use in replies,
932: * in the same form used by setsockopt.
933: * The first hop is placed before the options, will be removed later.
934: */
935: struct mbuf *
936: ip_srcroute()
937: {
938: register struct in_addr *p, *q;
939: register struct mbuf *m;
940:
941: if (ip_nhops == 0)
942: return ((struct mbuf *)0);
943: m = m_get(M_DONTWAIT, MT_SOOPTS);
944: if (m == 0)
945: return ((struct mbuf *)0);
946:
1.13 mycroft 947: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 948:
949: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
950: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
951: OPTSIZ;
952: #ifdef DIAGNOSTIC
953: if (ipprintfs)
1.39 christos 954: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 955: #endif
956:
957: /*
958: * First save first hop for return route
959: */
960: p = &ip_srcrt.route[ip_nhops - 1];
961: *(mtod(m, struct in_addr *)) = *p--;
962: #ifdef DIAGNOSTIC
963: if (ipprintfs)
1.39 christos 964: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 965: #endif
966:
967: /*
968: * Copy option fields and padding (nop) to mbuf.
969: */
970: ip_srcrt.nop = IPOPT_NOP;
971: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
972: bcopy((caddr_t)&ip_srcrt.nop,
973: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
974: q = (struct in_addr *)(mtod(m, caddr_t) +
975: sizeof(struct in_addr) + OPTSIZ);
976: #undef OPTSIZ
977: /*
978: * Record return path as an IP source route,
979: * reversing the path (pointers are now aligned).
980: */
981: while (p >= ip_srcrt.route) {
982: #ifdef DIAGNOSTIC
983: if (ipprintfs)
1.39 christos 984: printf(" %x", ntohl(q->s_addr));
1.1 cgd 985: #endif
986: *q++ = *p--;
987: }
988: /*
989: * Last hop goes to final destination.
990: */
991: *q = ip_srcrt.dst;
992: #ifdef DIAGNOSTIC
993: if (ipprintfs)
1.39 christos 994: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 995: #endif
996: return (m);
997: }
998:
999: /*
1000: * Strip out IP options, at higher
1001: * level protocol in the kernel.
1002: * Second argument is buffer to which options
1003: * will be moved, and return value is their length.
1004: * XXX should be deleted; last arg currently ignored.
1005: */
1.8 mycroft 1006: void
1.1 cgd 1007: ip_stripoptions(m, mopt)
1008: register struct mbuf *m;
1009: struct mbuf *mopt;
1010: {
1011: register int i;
1012: struct ip *ip = mtod(m, struct ip *);
1013: register caddr_t opts;
1014: int olen;
1015:
1016: olen = (ip->ip_hl<<2) - sizeof (struct ip);
1017: opts = (caddr_t)(ip + 1);
1018: i = m->m_len - (sizeof (struct ip) + olen);
1019: bcopy(opts + olen, opts, (unsigned)i);
1020: m->m_len -= olen;
1021: if (m->m_flags & M_PKTHDR)
1022: m->m_pkthdr.len -= olen;
1023: ip->ip_hl = sizeof(struct ip) >> 2;
1024: }
1025:
1.23 mycroft 1026: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1027: 0, 0, 0, 0,
1028: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1029: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1030: EMSGSIZE, EHOSTUNREACH, 0, 0,
1031: 0, 0, 0, 0,
1032: ENOPROTOOPT
1033: };
1034:
1035: /*
1036: * Forward a packet. If some error occurs return the sender
1037: * an icmp packet. Note we can't always generate a meaningful
1038: * icmp message because icmp doesn't have a large enough repertoire
1039: * of codes and types.
1040: *
1041: * If not forwarding, just drop the packet. This could be confusing
1042: * if ipforwarding was zero but some routing protocol was advancing
1043: * us as a gateway to somewhere. However, we must let the routing
1044: * protocol deal with that.
1045: *
1046: * The srcrt parameter indicates whether the packet is being forwarded
1047: * via a source route.
1048: */
1.13 mycroft 1049: void
1.1 cgd 1050: ip_forward(m, srcrt)
1051: struct mbuf *m;
1052: int srcrt;
1053: {
1054: register struct ip *ip = mtod(m, struct ip *);
1055: register struct sockaddr_in *sin;
1056: register struct rtentry *rt;
1.28 christos 1057: int error, type = 0, code = 0;
1.1 cgd 1058: struct mbuf *mcopy;
1.13 mycroft 1059: n_long dest;
1060: struct ifnet *destifp;
1.1 cgd 1061:
1.13 mycroft 1062: dest = 0;
1.1 cgd 1063: #ifdef DIAGNOSTIC
1064: if (ipprintfs)
1.39 christos 1065: printf("forward: src %x dst %x ttl %x\n",
1.35 mycroft 1066: ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl);
1.1 cgd 1067: #endif
1068: if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) {
1069: ipstat.ips_cantforward++;
1070: m_freem(m);
1071: return;
1072: }
1073: HTONS(ip->ip_id);
1074: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1075: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1076: return;
1077: }
1078: ip->ip_ttl -= IPTTLDEC;
1079:
1.19 mycroft 1080: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1081: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1082: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1083: if (ipforward_rt.ro_rt) {
1084: RTFREE(ipforward_rt.ro_rt);
1085: ipforward_rt.ro_rt = 0;
1086: }
1087: sin->sin_family = AF_INET;
1.35 mycroft 1088: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1089: sin->sin_addr = ip->ip_dst;
1090:
1091: rtalloc(&ipforward_rt);
1092: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1093: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1094: return;
1095: }
1096: rt = ipforward_rt.ro_rt;
1097: }
1098:
1099: /*
1.34 mycroft 1100: * Save at most 68 bytes of the packet in case
1.1 cgd 1101: * we need to generate an ICMP message to the src.
1102: */
1.34 mycroft 1103: mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1 cgd 1104:
1105: /*
1106: * If forwarding packet using same interface that it came in on,
1107: * perhaps should send a redirect to sender to shortcut a hop.
1108: * Only send redirect if source is sending directly to us,
1109: * and if packet was not source routed (or has any options).
1110: * Also, don't send redirect if forwarding using a default route
1111: * or a route modified by a redirect.
1112: */
1113: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1114: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1115: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1116: ipsendredirects && !srcrt) {
1.19 mycroft 1117: if (rt->rt_ifa &&
1118: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1119: ifatoia(rt->rt_ifa)->ia_subnet) {
1.1 cgd 1120: if (rt->rt_flags & RTF_GATEWAY)
1.13 mycroft 1121: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1.1 cgd 1122: else
1.13 mycroft 1123: dest = ip->ip_dst.s_addr;
1124: /* Router requirements says to only send host redirects */
1.1 cgd 1125: type = ICMP_REDIRECT;
1.13 mycroft 1126: code = ICMP_REDIRECT_HOST;
1.1 cgd 1127: #ifdef DIAGNOSTIC
1128: if (ipprintfs)
1.39 christos 1129: printf("redirect (%d) to %x\n", code, (u_int32_t)dest);
1.1 cgd 1130: #endif
1131: }
1132: }
1133:
1.27 thorpej 1134: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1135: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1136: if (error)
1137: ipstat.ips_cantforward++;
1138: else {
1139: ipstat.ips_forward++;
1140: if (type)
1141: ipstat.ips_redirectsent++;
1142: else {
1143: if (mcopy)
1144: m_freem(mcopy);
1145: return;
1146: }
1147: }
1148: if (mcopy == NULL)
1149: return;
1.13 mycroft 1150: destifp = NULL;
1151:
1.1 cgd 1152: switch (error) {
1153:
1154: case 0: /* forwarded, but need redirect */
1155: /* type, code set above */
1156: break;
1157:
1158: case ENETUNREACH: /* shouldn't happen, checked above */
1159: case EHOSTUNREACH:
1160: case ENETDOWN:
1161: case EHOSTDOWN:
1162: default:
1163: type = ICMP_UNREACH;
1164: code = ICMP_UNREACH_HOST;
1165: break;
1166:
1167: case EMSGSIZE:
1168: type = ICMP_UNREACH;
1169: code = ICMP_UNREACH_NEEDFRAG;
1.13 mycroft 1170: if (ipforward_rt.ro_rt)
1171: destifp = ipforward_rt.ro_rt->rt_ifp;
1.1 cgd 1172: ipstat.ips_cantfrag++;
1173: break;
1174:
1175: case ENOBUFS:
1176: type = ICMP_SOURCEQUENCH;
1177: code = 0;
1178: break;
1179: }
1.13 mycroft 1180: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1181: }
1182:
1183: void
1184: ip_savecontrol(inp, mp, ip, m)
1185: register struct inpcb *inp;
1186: register struct mbuf **mp;
1187: register struct ip *ip;
1188: register struct mbuf *m;
1189: {
1190:
1191: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1192: struct timeval tv;
1193:
1194: microtime(&tv);
1195: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1196: SCM_TIMESTAMP, SOL_SOCKET);
1197: if (*mp)
1198: mp = &(*mp)->m_next;
1199: }
1200: if (inp->inp_flags & INP_RECVDSTADDR) {
1201: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1202: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1203: if (*mp)
1204: mp = &(*mp)->m_next;
1205: }
1206: #ifdef notyet
1207: /*
1208: * XXX
1209: * Moving these out of udp_input() made them even more broken
1210: * than they already were.
1211: * - fenner@parc.xerox.com
1212: */
1213: /* options were tossed already */
1214: if (inp->inp_flags & INP_RECVOPTS) {
1215: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1216: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1217: if (*mp)
1218: mp = &(*mp)->m_next;
1219: }
1220: /* ip_srcroute doesn't do what we want here, need to fix */
1221: if (inp->inp_flags & INP_RECVRETOPTS) {
1222: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1223: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1224: if (*mp)
1225: mp = &(*mp)->m_next;
1226: }
1227: #endif
1228: if (inp->inp_flags & INP_RECVIF) {
1229: struct sockaddr_dl sdl;
1230:
1231: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1232: sdl.sdl_family = AF_LINK;
1233: sdl.sdl_index = m->m_pkthdr.rcvif ?
1234: m->m_pkthdr.rcvif->if_index : 0;
1235: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1236: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1237: IP_RECVIF, IPPROTO_IP);
1238: if (*mp)
1239: mp = &(*mp)->m_next;
1240: }
1.13 mycroft 1241: }
1242:
1243: int
1244: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1245: int *name;
1246: u_int namelen;
1247: void *oldp;
1248: size_t *oldlenp;
1249: void *newp;
1250: size_t newlen;
1251: {
1.52 thorpej 1252: extern int subnetsarelocal;
1253:
1.54 lukem 1254: int error, old;
1255:
1.13 mycroft 1256: /* All sysctl names at this level are terminal. */
1257: if (namelen != 1)
1258: return (ENOTDIR);
1259:
1260: switch (name[0]) {
1261: case IPCTL_FORWARDING:
1262: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1263: case IPCTL_SENDREDIRECTS:
1264: return (sysctl_int(oldp, oldlenp, newp, newlen,
1265: &ipsendredirects));
1266: case IPCTL_DEFTTL:
1267: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1268: #ifdef notyet
1269: case IPCTL_DEFMTU:
1270: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1271: #endif
1.26 thorpej 1272: case IPCTL_FORWSRCRT:
1.47 cjs 1273: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1274: if (securelevel > 0)
1.46 cjs 1275: return (sysctl_rdint(oldp, oldlenp, newp,
1276: ip_forwsrcrt));
1277: else
1278: return (sysctl_int(oldp, oldlenp, newp, newlen,
1279: &ip_forwsrcrt));
1.27 thorpej 1280: case IPCTL_DIRECTEDBCAST:
1281: return (sysctl_int(oldp, oldlenp, newp, newlen,
1282: &ip_directedbcast));
1.47 cjs 1283: case IPCTL_ALLOWSRCRT:
1284: return (sysctl_int(oldp, oldlenp, newp, newlen,
1285: &ip_allowsrcrt));
1.52 thorpej 1286: case IPCTL_SUBNETSARELOCAL:
1287: return (sysctl_int(oldp, oldlenp, newp, newlen,
1288: &subnetsarelocal));
1.53 kml 1289: case IPCTL_MTUDISC:
1.54 lukem 1290: return (sysctl_int(oldp, oldlenp, newp, newlen,
1.53 kml 1291: &ip_mtudisc));
1.54 lukem 1292: case IPCTL_ANONPORTMIN:
1293: old = anonportmin;
1294: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1295: if (anonportmin >= anonportmax || anonportmin > 65535
1296: #ifndef IPNOPRIVPORTS
1297: || anonportmin < IPPORT_RESERVED
1298: #endif
1299: ) {
1300: anonportmin = old;
1301: return (EINVAL);
1302: }
1303: return (error);
1304: case IPCTL_ANONPORTMAX:
1305: old = anonportmax;
1306: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1307: if (anonportmin >= anonportmax || anonportmax > 65535
1308: #ifndef IPNOPRIVPORTS
1309: || anonportmax < IPPORT_RESERVED
1310: #endif
1311: ) {
1312: anonportmax = old;
1313: return (EINVAL);
1314: }
1315: return (error);
1.13 mycroft 1316: default:
1317: return (EOPNOTSUPP);
1318: }
1319: /* NOTREACHED */
1.1 cgd 1320: }
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