Annotation of src/sys/netinet/ip_input.c, Revision 1.56
1.56 ! thorpej 1: /* $NetBSD: ip_input.c,v 1.55 1998/01/12 03:02:51 scottr 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>
1.44 thorpej 68:
1.1 cgd 69: #ifndef IPFORWARDING
70: #ifdef GATEWAY
71: #define IPFORWARDING 1 /* forward IP packets not for us */
72: #else /* GATEWAY */
73: #define IPFORWARDING 0 /* don't forward IP packets not for us */
74: #endif /* GATEWAY */
75: #endif /* IPFORWARDING */
76: #ifndef IPSENDREDIRECTS
77: #define IPSENDREDIRECTS 1
78: #endif
1.26 thorpej 79: #ifndef IPFORWSRCRT
1.47 cjs 80: #define IPFORWSRCRT 1 /* forward source-routed packets */
81: #endif
82: #ifndef IPALLOWSRCRT
1.48 mrg 83: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 84: #endif
1.53 kml 85: #ifndef IPMTUDISC
86: #define IPMTUDISC 0
87: #endif
88:
1.27 thorpej 89: /*
90: * Note: DIRECTED_BROADCAST is handled this way so that previous
91: * configuration using this option will Just Work.
92: */
93: #ifndef IPDIRECTEDBCAST
94: #ifdef DIRECTED_BROADCAST
95: #define IPDIRECTEDBCAST 1
96: #else
97: #define IPDIRECTEDBCAST 0
98: #endif /* DIRECTED_BROADCAST */
99: #endif /* IPDIRECTEDBCAST */
1.1 cgd 100: int ipforwarding = IPFORWARDING;
101: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 102: int ip_defttl = IPDEFTTL;
1.26 thorpej 103: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 104: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 105: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 106: int ip_mtudisc = IPMTUDISC;
1.1 cgd 107: #ifdef DIAGNOSTIC
108: int ipprintfs = 0;
109: #endif
110:
111: extern struct domain inetdomain;
112: extern struct protosw inetsw[];
113: u_char ip_protox[IPPROTO_MAX];
114: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 115: struct in_ifaddrhead in_ifaddr;
1.13 mycroft 116: struct ifqueue ipintrq;
1.1 cgd 117:
118: /*
119: * We need to save the IP options in case a protocol wants to respond
120: * to an incoming packet over the same route if the packet got here
121: * using IP source routing. This allows connection establishment and
122: * maintenance when the remote end is on a network that is not known
123: * to us.
124: */
125: int ip_nhops = 0;
126: static struct ip_srcrt {
127: struct in_addr dst; /* final destination */
128: char nop; /* one NOP to align */
129: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
130: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
131: } ip_srcrt;
132:
1.13 mycroft 133: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 134:
1.1 cgd 135: /*
136: * IP initialization: fill in IP protocol switch table.
137: * All protocols not implemented in kernel go to raw IP protocol handler.
138: */
1.8 mycroft 139: void
1.1 cgd 140: ip_init()
141: {
142: register struct protosw *pr;
143: register int i;
144:
145: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
146: if (pr == 0)
147: panic("ip_init");
148: for (i = 0; i < IPPROTO_MAX; i++)
149: ip_protox[i] = pr - inetsw;
150: for (pr = inetdomain.dom_protosw;
151: pr < inetdomain.dom_protoswNPROTOSW; pr++)
152: if (pr->pr_domain->dom_family == PF_INET &&
153: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
154: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 155: LIST_INIT(&ipq);
1.1 cgd 156: ip_id = time.tv_sec & 0xffff;
157: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 158: TAILQ_INIT(&in_ifaddr);
1.1 cgd 159: }
160:
161: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
162: struct route ipforward_rt;
163:
164: /*
165: * Ip input routine. Checksum and byte swap header. If fragmented
166: * try to reassemble. Process options. Pass to next level.
167: */
1.8 mycroft 168: void
1.1 cgd 169: ipintr()
170: {
1.33 mrg 171: register struct ip *ip = NULL;
1.1 cgd 172: register struct mbuf *m;
173: register struct ipq *fp;
174: register struct in_ifaddr *ia;
1.25 cgd 175: struct ipqent *ipqe;
1.35 mycroft 176: int hlen = 0, mff, len, s;
1.36 mrg 177: #ifdef PFIL_HOOKS
1.33 mrg 178: struct packet_filter_hook *pfh;
179: struct mbuf *m0;
1.43 mrg 180: int rv;
1.36 mrg 181: #endif /* PFIL_HOOKS */
1.1 cgd 182:
183: next:
184: /*
185: * Get next datagram off input queue and get IP header
186: * in first mbuf.
187: */
188: s = splimp();
189: IF_DEQUEUE(&ipintrq, m);
190: splx(s);
1.13 mycroft 191: if (m == 0)
1.1 cgd 192: return;
193: #ifdef DIAGNOSTIC
194: if ((m->m_flags & M_PKTHDR) == 0)
195: panic("ipintr no HDR");
196: #endif
197: /*
198: * If no IP addresses have been set yet but the interfaces
199: * are receiving, can't do anything with incoming packets yet.
200: */
1.22 mycroft 201: if (in_ifaddr.tqh_first == 0)
1.1 cgd 202: goto bad;
203: ipstat.ips_total++;
204: if (m->m_len < sizeof (struct ip) &&
205: (m = m_pullup(m, sizeof (struct ip))) == 0) {
206: ipstat.ips_toosmall++;
207: goto next;
208: }
209: ip = mtod(m, struct ip *);
1.13 mycroft 210: if (ip->ip_v != IPVERSION) {
211: ipstat.ips_badvers++;
212: goto bad;
213: }
1.1 cgd 214: hlen = ip->ip_hl << 2;
215: if (hlen < sizeof(struct ip)) { /* minimum header length */
216: ipstat.ips_badhlen++;
217: goto bad;
218: }
219: if (hlen > m->m_len) {
220: if ((m = m_pullup(m, hlen)) == 0) {
221: ipstat.ips_badhlen++;
222: goto next;
223: }
224: ip = mtod(m, struct ip *);
225: }
1.28 christos 226: if ((ip->ip_sum = in_cksum(m, hlen)) != 0) {
1.1 cgd 227: ipstat.ips_badsum++;
228: goto bad;
229: }
230:
231: /*
232: * Convert fields to host representation.
233: */
234: NTOHS(ip->ip_len);
235: NTOHS(ip->ip_id);
236: NTOHS(ip->ip_off);
1.35 mycroft 237: len = ip->ip_len;
1.1 cgd 238:
239: /*
240: * Check that the amount of data in the buffers
241: * is as at least much as the IP header would have us expect.
242: * Trim mbufs if longer than we expect.
243: * Drop packet if shorter than we expect.
244: */
1.35 mycroft 245: if (m->m_pkthdr.len < len) {
1.1 cgd 246: ipstat.ips_tooshort++;
247: goto bad;
248: }
1.35 mycroft 249: if (m->m_pkthdr.len > len) {
1.1 cgd 250: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 251: m->m_len = len;
252: m->m_pkthdr.len = len;
1.1 cgd 253: } else
1.35 mycroft 254: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 255: }
256:
1.36 mrg 257: #ifdef PFIL_HOOKS
1.33 mrg 258: /*
259: * Run through list of hooks for input packets.
260: */
261: m0 = m;
262: for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.le_next)
263: if (pfh->pfil_func) {
1.43 mrg 264: rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0);
265: if (rv)
1.40 veego 266: goto next;
1.49 christos 267: ip = mtod(m = m0, struct ip *);
1.33 mrg 268: }
1.36 mrg 269: #endif /* PFIL_HOOKS */
1.33 mrg 270:
1.1 cgd 271: /*
272: * Process options and, if not destined for us,
273: * ship it on. ip_dooptions returns 1 when an
274: * error was detected (causing an icmp message
275: * to be sent and the original packet to be freed).
276: */
277: ip_nhops = 0; /* for source routed packets */
278: if (hlen > sizeof (struct ip) && ip_dooptions(m))
279: goto next;
280:
281: /*
282: * Check our list of addresses, to see if the packet is for us.
283: */
1.22 mycroft 284: for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) {
1.35 mycroft 285: if (in_hosteq(ip->ip_dst, ia->ia_addr.sin_addr))
1.1 cgd 286: goto ours;
1.27 thorpej 287: if (((ip_directedbcast == 0) || (ip_directedbcast &&
288: ia->ia_ifp == m->m_pkthdr.rcvif)) &&
1.1 cgd 289: (ia->ia_ifp->if_flags & IFF_BROADCAST)) {
1.35 mycroft 290: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
291: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 292: /*
293: * Look for all-0's host part (old broadcast addr),
294: * either for subnet or net.
295: */
296: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 297: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 298: goto ours;
299: }
1.51 gwr 300: /*
301: * An interface with IP address zero accepts
302: * all packets that arrive on that interface.
303: */
304: if ((ia->ia_ifp == m->m_pkthdr.rcvif) &&
305: in_nullhost(ia->ia_addr.sin_addr))
306: goto ours;
1.1 cgd 307: }
1.18 mycroft 308: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 309: struct in_multi *inm;
310: #ifdef MROUTING
311: extern struct socket *ip_mrouter;
1.10 brezak 312:
313: if (m->m_flags & M_EXT) {
314: if ((m = m_pullup(m, hlen)) == 0) {
315: ipstat.ips_toosmall++;
316: goto next;
317: }
318: ip = mtod(m, struct ip *);
319: }
1.4 hpeyerl 320:
321: if (ip_mrouter) {
322: /*
323: * If we are acting as a multicast router, all
324: * incoming multicast packets are passed to the
325: * kernel-level multicast forwarding function.
326: * The packet is returned (relatively) intact; if
327: * ip_mforward() returns a non-zero value, the packet
328: * must be discarded, else it may be accepted below.
329: *
330: * (The IP ident field is put in the same byte order
331: * as expected when ip_mforward() is called from
332: * ip_output().)
333: */
334: ip->ip_id = htons(ip->ip_id);
1.13 mycroft 335: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
336: ipstat.ips_cantforward++;
1.4 hpeyerl 337: m_freem(m);
338: goto next;
339: }
340: ip->ip_id = ntohs(ip->ip_id);
341:
342: /*
343: * The process-level routing demon needs to receive
344: * all multicast IGMP packets, whether or not this
345: * host belongs to their destination groups.
346: */
347: if (ip->ip_p == IPPROTO_IGMP)
348: goto ours;
1.13 mycroft 349: ipstat.ips_forward++;
1.4 hpeyerl 350: }
351: #endif
352: /*
353: * See if we belong to the destination multicast group on the
354: * arrival interface.
355: */
356: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
357: if (inm == NULL) {
1.13 mycroft 358: ipstat.ips_cantforward++;
1.4 hpeyerl 359: m_freem(m);
360: goto next;
361: }
362: goto ours;
363: }
1.19 mycroft 364: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 365: in_nullhost(ip->ip_dst))
1.1 cgd 366: goto ours;
367:
368: /*
369: * Not for us; forward if possible and desirable.
370: */
371: if (ipforwarding == 0) {
372: ipstat.ips_cantforward++;
373: m_freem(m);
374: } else
375: ip_forward(m, 0);
376: goto next;
377:
378: ours:
379: /*
380: * If offset or IP_MF are set, must reassemble.
381: * Otherwise, nothing need be done.
382: * (We could look in the reassembly queue to see
383: * if the packet was previously fragmented,
384: * but it's not worth the time; just let them time out.)
385: */
1.37 perry 386: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 387: /*
388: * Look for queue of fragments
389: * of this datagram.
390: */
1.25 cgd 391: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 392: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 393: in_hosteq(ip->ip_src, fp->ipq_src) &&
394: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 395: ip->ip_p == fp->ipq_p)
396: goto found;
397: fp = 0;
398: found:
399:
400: /*
401: * Adjust ip_len to not reflect header,
1.25 cgd 402: * set ipqe_mff if more fragments are expected,
1.1 cgd 403: * convert offset of this to bytes.
404: */
405: ip->ip_len -= hlen;
1.25 cgd 406: mff = (ip->ip_off & IP_MF) != 0;
407: if (mff) {
1.16 cgd 408: /*
409: * Make sure that fragments have a data length
410: * that's a non-zero multiple of 8 bytes.
411: */
1.17 cgd 412: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 413: ipstat.ips_badfrags++;
414: goto bad;
415: }
416: }
1.1 cgd 417: ip->ip_off <<= 3;
418:
419: /*
420: * If datagram marked as having more fragments
421: * or if this is not the first fragment,
422: * attempt reassembly; if it succeeds, proceed.
423: */
1.25 cgd 424: if (mff || ip->ip_off) {
1.1 cgd 425: ipstat.ips_fragments++;
1.25 cgd 426: MALLOC(ipqe, struct ipqent *, sizeof (struct ipqent),
427: M_IPQ, M_NOWAIT);
428: if (ipqe == NULL) {
429: ipstat.ips_rcvmemdrop++;
430: goto bad;
431: }
432: ipqe->ipqe_mff = mff;
1.50 thorpej 433: ipqe->ipqe_m = m;
1.25 cgd 434: ipqe->ipqe_ip = ip;
1.50 thorpej 435: m = ip_reass(ipqe, fp);
436: if (m == 0)
1.1 cgd 437: goto next;
1.13 mycroft 438: ipstat.ips_reassembled++;
1.50 thorpej 439: ip = mtod(m, struct ip *);
1.1 cgd 440: } else
441: if (fp)
442: ip_freef(fp);
443: } else
444: ip->ip_len -= hlen;
445:
446: /*
447: * Switch out to protocol's input routine.
448: */
449: ipstat.ips_delivered++;
450: (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
451: goto next;
452: bad:
453: m_freem(m);
454: goto next;
455: }
456:
457: /*
458: * Take incoming datagram fragment and try to
459: * reassemble it into whole datagram. If a chain for
460: * reassembly of this datagram already exists, then it
461: * is given as fp; otherwise have to make a chain.
462: */
1.50 thorpej 463: struct mbuf *
1.25 cgd 464: ip_reass(ipqe, fp)
465: register struct ipqent *ipqe;
1.1 cgd 466: register struct ipq *fp;
467: {
1.50 thorpej 468: register struct mbuf *m = ipqe->ipqe_m;
1.25 cgd 469: register struct ipqent *nq, *p, *q;
470: struct ip *ip;
1.1 cgd 471: struct mbuf *t;
1.25 cgd 472: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 473: int i, next;
474:
475: /*
476: * Presence of header sizes in mbufs
477: * would confuse code below.
478: */
479: m->m_data += hlen;
480: m->m_len -= hlen;
481:
482: /*
483: * If first fragment to arrive, create a reassembly queue.
484: */
485: if (fp == 0) {
1.50 thorpej 486: MALLOC(fp, struct ipq *, sizeof (struct ipq),
487: M_FTABLE, M_NOWAIT);
488: if (fp == NULL)
1.1 cgd 489: goto dropfrag;
1.25 cgd 490: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 491: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 492: fp->ipq_p = ipqe->ipqe_ip->ip_p;
493: fp->ipq_id = ipqe->ipqe_ip->ip_id;
494: LIST_INIT(&fp->ipq_fragq);
495: fp->ipq_src = ipqe->ipqe_ip->ip_src;
496: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
497: p = NULL;
1.1 cgd 498: goto insert;
499: }
500:
501: /*
502: * Find a segment which begins after this one does.
503: */
1.25 cgd 504: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
505: p = q, q = q->ipqe_q.le_next)
506: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 507: break;
508:
509: /*
510: * If there is a preceding segment, it may provide some of
511: * our data already. If so, drop the data from the incoming
512: * segment. If it provides all of our data, drop us.
513: */
1.25 cgd 514: if (p != NULL) {
515: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
516: ipqe->ipqe_ip->ip_off;
1.1 cgd 517: if (i > 0) {
1.25 cgd 518: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 519: goto dropfrag;
1.50 thorpej 520: m_adj(ipqe->ipqe_m, i);
1.25 cgd 521: ipqe->ipqe_ip->ip_off += i;
522: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 523: }
524: }
525:
526: /*
527: * While we overlap succeeding segments trim them or,
528: * if they are completely covered, dequeue them.
529: */
1.25 cgd 530: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
531: q->ipqe_ip->ip_off; q = nq) {
532: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
533: q->ipqe_ip->ip_off;
534: if (i < q->ipqe_ip->ip_len) {
535: q->ipqe_ip->ip_len -= i;
536: q->ipqe_ip->ip_off += i;
1.50 thorpej 537: m_adj(q->ipqe_m, i);
1.1 cgd 538: break;
539: }
1.25 cgd 540: nq = q->ipqe_q.le_next;
1.50 thorpej 541: m_freem(q->ipqe_m);
1.25 cgd 542: LIST_REMOVE(q, ipqe_q);
543: FREE(q, M_IPQ);
1.1 cgd 544: }
545:
546: insert:
547: /*
548: * Stick new segment in its place;
549: * check for complete reassembly.
550: */
1.25 cgd 551: if (p == NULL) {
552: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
553: } else {
554: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
555: }
1.1 cgd 556: next = 0;
1.25 cgd 557: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
558: p = q, q = q->ipqe_q.le_next) {
559: if (q->ipqe_ip->ip_off != next)
1.1 cgd 560: return (0);
1.25 cgd 561: next += q->ipqe_ip->ip_len;
1.1 cgd 562: }
1.25 cgd 563: if (p->ipqe_mff)
1.1 cgd 564: return (0);
565:
566: /*
1.41 thorpej 567: * Reassembly is complete. Check for a bogus message size and
568: * concatenate fragments.
1.1 cgd 569: */
1.25 cgd 570: q = fp->ipq_fragq.lh_first;
571: ip = q->ipqe_ip;
1.41 thorpej 572: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
573: ipstat.ips_toolong++;
574: ip_freef(fp);
575: return (0);
576: }
1.50 thorpej 577: m = q->ipqe_m;
1.1 cgd 578: t = m->m_next;
579: m->m_next = 0;
580: m_cat(m, t);
1.25 cgd 581: nq = q->ipqe_q.le_next;
582: FREE(q, M_IPQ);
583: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 584: t = q->ipqe_m;
1.25 cgd 585: nq = q->ipqe_q.le_next;
586: FREE(q, M_IPQ);
1.1 cgd 587: m_cat(m, t);
588: }
589:
590: /*
591: * Create header for new ip packet by
592: * modifying header of first packet;
593: * dequeue and discard fragment reassembly header.
594: * Make header visible.
595: */
596: ip->ip_len = next;
1.25 cgd 597: ip->ip_src = fp->ipq_src;
598: ip->ip_dst = fp->ipq_dst;
599: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 600: FREE(fp, M_FTABLE);
1.1 cgd 601: m->m_len += (ip->ip_hl << 2);
602: m->m_data -= (ip->ip_hl << 2);
603: /* some debugging cruft by sklower, below, will go away soon */
604: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
605: register int plen = 0;
1.50 thorpej 606: for (t = m; t; t = t->m_next)
607: plen += t->m_len;
608: m->m_pkthdr.len = plen;
1.1 cgd 609: }
1.50 thorpej 610: return (m);
1.1 cgd 611:
612: dropfrag:
613: ipstat.ips_fragdropped++;
614: m_freem(m);
1.25 cgd 615: FREE(ipqe, M_IPQ);
1.1 cgd 616: return (0);
617: }
618:
619: /*
620: * Free a fragment reassembly header and all
621: * associated datagrams.
622: */
1.8 mycroft 623: void
1.1 cgd 624: ip_freef(fp)
625: struct ipq *fp;
626: {
1.25 cgd 627: register struct ipqent *q, *p;
1.1 cgd 628:
1.25 cgd 629: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
630: p = q->ipqe_q.le_next;
1.50 thorpej 631: m_freem(q->ipqe_m);
1.25 cgd 632: LIST_REMOVE(q, ipqe_q);
633: FREE(q, M_IPQ);
1.1 cgd 634: }
1.25 cgd 635: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 636: FREE(fp, M_FTABLE);
1.1 cgd 637: }
638:
639: /*
640: * IP timer processing;
641: * if a timer expires on a reassembly
642: * queue, discard it.
643: */
1.8 mycroft 644: void
1.1 cgd 645: ip_slowtimo()
646: {
1.25 cgd 647: register struct ipq *fp, *nfp;
1.24 mycroft 648: int s = splsoftnet();
1.1 cgd 649:
1.25 cgd 650: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
651: nfp = fp->ipq_q.le_next;
652: if (--fp->ipq_ttl == 0) {
1.1 cgd 653: ipstat.ips_fragtimeout++;
1.25 cgd 654: ip_freef(fp);
1.1 cgd 655: }
656: }
657: splx(s);
658: }
659:
660: /*
661: * Drain off all datagram fragments.
662: */
1.8 mycroft 663: void
1.1 cgd 664: ip_drain()
665: {
666:
1.25 cgd 667: while (ipq.lh_first != NULL) {
1.1 cgd 668: ipstat.ips_fragdropped++;
1.25 cgd 669: ip_freef(ipq.lh_first);
1.1 cgd 670: }
671: }
672:
673: /*
674: * Do option processing on a datagram,
675: * possibly discarding it if bad options are encountered,
676: * or forwarding it if source-routed.
677: * Returns 1 if packet has been forwarded/freed,
678: * 0 if the packet should be processed further.
679: */
1.8 mycroft 680: int
1.1 cgd 681: ip_dooptions(m)
682: struct mbuf *m;
683: {
684: register struct ip *ip = mtod(m, struct ip *);
685: register u_char *cp;
686: register struct ip_timestamp *ipt;
687: register struct in_ifaddr *ia;
688: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.13 mycroft 689: struct in_addr *sin, dst;
1.1 cgd 690: n_time ntime;
691:
1.13 mycroft 692: dst = ip->ip_dst;
1.1 cgd 693: cp = (u_char *)(ip + 1);
694: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
695: for (; cnt > 0; cnt -= optlen, cp += optlen) {
696: opt = cp[IPOPT_OPTVAL];
697: if (opt == IPOPT_EOL)
698: break;
699: if (opt == IPOPT_NOP)
700: optlen = 1;
701: else {
702: optlen = cp[IPOPT_OLEN];
703: if (optlen <= 0 || optlen > cnt) {
704: code = &cp[IPOPT_OLEN] - (u_char *)ip;
705: goto bad;
706: }
707: }
708: switch (opt) {
709:
710: default:
711: break;
712:
713: /*
714: * Source routing with record.
715: * Find interface with current destination address.
716: * If none on this machine then drop if strictly routed,
717: * or do nothing if loosely routed.
718: * Record interface address and bring up next address
719: * component. If strictly routed make sure next
720: * address is on directly accessible net.
721: */
722: case IPOPT_LSRR:
723: case IPOPT_SSRR:
1.47 cjs 724: if (ip_allowsrcrt == 0) {
725: type = ICMP_UNREACH;
726: code = ICMP_UNREACH_NET_PROHIB;
727: goto bad;
728: }
1.1 cgd 729: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
730: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
731: goto bad;
732: }
733: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 734: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 735: if (ia == 0) {
736: if (opt == IPOPT_SSRR) {
737: type = ICMP_UNREACH;
738: code = ICMP_UNREACH_SRCFAIL;
739: goto bad;
740: }
741: /*
742: * Loose routing, and not at next destination
743: * yet; nothing to do except forward.
744: */
745: break;
746: }
747: off--; /* 0 origin */
748: if (off > optlen - sizeof(struct in_addr)) {
749: /*
750: * End of source route. Should be for us.
751: */
752: save_rte(cp, ip->ip_src);
753: break;
754: }
755: /*
756: * locate outgoing interface
757: */
758: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
759: sizeof(ipaddr.sin_addr));
760: if (opt == IPOPT_SSRR) {
761: #define INA struct in_ifaddr *
762: #define SA struct sockaddr *
1.29 mrg 763: ia = (INA)ifa_ifwithladdr((SA)&ipaddr);
1.1 cgd 764: } else
765: ia = ip_rtaddr(ipaddr.sin_addr);
766: if (ia == 0) {
767: type = ICMP_UNREACH;
768: code = ICMP_UNREACH_SRCFAIL;
769: goto bad;
770: }
771: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 772: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 773: (caddr_t)(cp + off), sizeof(struct in_addr));
774: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 775: /*
776: * Let ip_intr's mcast routing check handle mcast pkts
777: */
1.18 mycroft 778: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 779: break;
780:
781: case IPOPT_RR:
782: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
783: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
784: goto bad;
785: }
786: /*
787: * If no space remains, ignore.
788: */
789: off--; /* 0 origin */
790: if (off > optlen - sizeof(struct in_addr))
791: break;
792: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
793: sizeof(ipaddr.sin_addr));
794: /*
795: * locate outgoing interface; if we're the destination,
796: * use the incoming interface (should be same).
797: */
798: if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
799: (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
800: type = ICMP_UNREACH;
801: code = ICMP_UNREACH_HOST;
802: goto bad;
803: }
1.20 mycroft 804: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 805: (caddr_t)(cp + off), sizeof(struct in_addr));
806: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
807: break;
808:
809: case IPOPT_TS:
810: code = cp - (u_char *)ip;
811: ipt = (struct ip_timestamp *)cp;
812: if (ipt->ipt_len < 5)
813: goto bad;
1.15 cgd 814: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1 cgd 815: if (++ipt->ipt_oflw == 0)
816: goto bad;
817: break;
818: }
819: sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
820: switch (ipt->ipt_flg) {
821:
822: case IPOPT_TS_TSONLY:
823: break;
824:
825: case IPOPT_TS_TSANDADDR:
826: if (ipt->ipt_ptr + sizeof(n_time) +
827: sizeof(struct in_addr) > ipt->ipt_len)
828: goto bad;
1.13 mycroft 829: ipaddr.sin_addr = dst;
830: ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
831: m->m_pkthdr.rcvif);
832: if (ia == 0)
833: continue;
1.20 mycroft 834: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 835: (caddr_t)sin, sizeof(struct in_addr));
836: ipt->ipt_ptr += sizeof(struct in_addr);
837: break;
838:
839: case IPOPT_TS_PRESPEC:
840: if (ipt->ipt_ptr + sizeof(n_time) +
841: sizeof(struct in_addr) > ipt->ipt_len)
842: goto bad;
843: bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
844: sizeof(struct in_addr));
845: if (ifa_ifwithaddr((SA)&ipaddr) == 0)
846: continue;
847: ipt->ipt_ptr += sizeof(struct in_addr);
848: break;
849:
850: default:
851: goto bad;
852: }
853: ntime = iptime();
854: bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
855: sizeof(n_time));
856: ipt->ipt_ptr += sizeof(n_time);
857: }
858: }
859: if (forward) {
1.26 thorpej 860: if (ip_forwsrcrt == 0) {
861: type = ICMP_UNREACH;
862: code = ICMP_UNREACH_SRCFAIL;
863: goto bad;
864: }
1.1 cgd 865: ip_forward(m, 1);
866: return (1);
1.13 mycroft 867: }
868: return (0);
1.1 cgd 869: bad:
1.13 mycroft 870: ip->ip_len -= ip->ip_hl << 2; /* XXX icmp_error adds in hdr length */
871: icmp_error(m, type, code, 0, 0);
872: ipstat.ips_badoptions++;
1.1 cgd 873: return (1);
874: }
875:
876: /*
877: * Given address of next destination (final or next hop),
878: * return internet address info of interface to be used to get there.
879: */
880: struct in_ifaddr *
881: ip_rtaddr(dst)
882: struct in_addr dst;
883: {
884: register struct sockaddr_in *sin;
885:
1.19 mycroft 886: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 887:
1.35 mycroft 888: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 889: if (ipforward_rt.ro_rt) {
890: RTFREE(ipforward_rt.ro_rt);
891: ipforward_rt.ro_rt = 0;
892: }
893: sin->sin_family = AF_INET;
894: sin->sin_len = sizeof(*sin);
895: sin->sin_addr = dst;
896:
897: rtalloc(&ipforward_rt);
898: }
899: if (ipforward_rt.ro_rt == 0)
900: return ((struct in_ifaddr *)0);
1.19 mycroft 901: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 902: }
903:
904: /*
905: * Save incoming source route for use in replies,
906: * to be picked up later by ip_srcroute if the receiver is interested.
907: */
1.13 mycroft 908: void
1.1 cgd 909: save_rte(option, dst)
910: u_char *option;
911: struct in_addr dst;
912: {
913: unsigned olen;
914:
915: olen = option[IPOPT_OLEN];
916: #ifdef DIAGNOSTIC
917: if (ipprintfs)
1.39 christos 918: printf("save_rte: olen %d\n", olen);
1.1 cgd 919: #endif
920: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
921: return;
922: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
923: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
924: ip_srcrt.dst = dst;
925: }
926:
927: /*
928: * Retrieve incoming source route for use in replies,
929: * in the same form used by setsockopt.
930: * The first hop is placed before the options, will be removed later.
931: */
932: struct mbuf *
933: ip_srcroute()
934: {
935: register struct in_addr *p, *q;
936: register struct mbuf *m;
937:
938: if (ip_nhops == 0)
939: return ((struct mbuf *)0);
940: m = m_get(M_DONTWAIT, MT_SOOPTS);
941: if (m == 0)
942: return ((struct mbuf *)0);
943:
1.13 mycroft 944: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 945:
946: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
947: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
948: OPTSIZ;
949: #ifdef DIAGNOSTIC
950: if (ipprintfs)
1.39 christos 951: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 952: #endif
953:
954: /*
955: * First save first hop for return route
956: */
957: p = &ip_srcrt.route[ip_nhops - 1];
958: *(mtod(m, struct in_addr *)) = *p--;
959: #ifdef DIAGNOSTIC
960: if (ipprintfs)
1.39 christos 961: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 962: #endif
963:
964: /*
965: * Copy option fields and padding (nop) to mbuf.
966: */
967: ip_srcrt.nop = IPOPT_NOP;
968: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
969: bcopy((caddr_t)&ip_srcrt.nop,
970: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
971: q = (struct in_addr *)(mtod(m, caddr_t) +
972: sizeof(struct in_addr) + OPTSIZ);
973: #undef OPTSIZ
974: /*
975: * Record return path as an IP source route,
976: * reversing the path (pointers are now aligned).
977: */
978: while (p >= ip_srcrt.route) {
979: #ifdef DIAGNOSTIC
980: if (ipprintfs)
1.39 christos 981: printf(" %x", ntohl(q->s_addr));
1.1 cgd 982: #endif
983: *q++ = *p--;
984: }
985: /*
986: * Last hop goes to final destination.
987: */
988: *q = ip_srcrt.dst;
989: #ifdef DIAGNOSTIC
990: if (ipprintfs)
1.39 christos 991: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 992: #endif
993: return (m);
994: }
995:
996: /*
997: * Strip out IP options, at higher
998: * level protocol in the kernel.
999: * Second argument is buffer to which options
1000: * will be moved, and return value is their length.
1001: * XXX should be deleted; last arg currently ignored.
1002: */
1.8 mycroft 1003: void
1.1 cgd 1004: ip_stripoptions(m, mopt)
1005: register struct mbuf *m;
1006: struct mbuf *mopt;
1007: {
1008: register int i;
1009: struct ip *ip = mtod(m, struct ip *);
1010: register caddr_t opts;
1011: int olen;
1012:
1013: olen = (ip->ip_hl<<2) - sizeof (struct ip);
1014: opts = (caddr_t)(ip + 1);
1015: i = m->m_len - (sizeof (struct ip) + olen);
1016: bcopy(opts + olen, opts, (unsigned)i);
1017: m->m_len -= olen;
1018: if (m->m_flags & M_PKTHDR)
1019: m->m_pkthdr.len -= olen;
1020: ip->ip_hl = sizeof(struct ip) >> 2;
1021: }
1022:
1.23 mycroft 1023: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1024: 0, 0, 0, 0,
1025: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1026: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1027: EMSGSIZE, EHOSTUNREACH, 0, 0,
1028: 0, 0, 0, 0,
1029: ENOPROTOOPT
1030: };
1031:
1032: /*
1033: * Forward a packet. If some error occurs return the sender
1034: * an icmp packet. Note we can't always generate a meaningful
1035: * icmp message because icmp doesn't have a large enough repertoire
1036: * of codes and types.
1037: *
1038: * If not forwarding, just drop the packet. This could be confusing
1039: * if ipforwarding was zero but some routing protocol was advancing
1040: * us as a gateway to somewhere. However, we must let the routing
1041: * protocol deal with that.
1042: *
1043: * The srcrt parameter indicates whether the packet is being forwarded
1044: * via a source route.
1045: */
1.13 mycroft 1046: void
1.1 cgd 1047: ip_forward(m, srcrt)
1048: struct mbuf *m;
1049: int srcrt;
1050: {
1051: register struct ip *ip = mtod(m, struct ip *);
1052: register struct sockaddr_in *sin;
1053: register struct rtentry *rt;
1.28 christos 1054: int error, type = 0, code = 0;
1.1 cgd 1055: struct mbuf *mcopy;
1.13 mycroft 1056: n_long dest;
1057: struct ifnet *destifp;
1.1 cgd 1058:
1.13 mycroft 1059: dest = 0;
1.1 cgd 1060: #ifdef DIAGNOSTIC
1061: if (ipprintfs)
1.39 christos 1062: printf("forward: src %x dst %x ttl %x\n",
1.35 mycroft 1063: ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl);
1.1 cgd 1064: #endif
1065: if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) {
1066: ipstat.ips_cantforward++;
1067: m_freem(m);
1068: return;
1069: }
1070: HTONS(ip->ip_id);
1071: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1072: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1073: return;
1074: }
1075: ip->ip_ttl -= IPTTLDEC;
1076:
1.19 mycroft 1077: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1078: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1079: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1080: if (ipforward_rt.ro_rt) {
1081: RTFREE(ipforward_rt.ro_rt);
1082: ipforward_rt.ro_rt = 0;
1083: }
1084: sin->sin_family = AF_INET;
1.35 mycroft 1085: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1086: sin->sin_addr = ip->ip_dst;
1087:
1088: rtalloc(&ipforward_rt);
1089: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1090: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1091: return;
1092: }
1093: rt = ipforward_rt.ro_rt;
1094: }
1095:
1096: /*
1.34 mycroft 1097: * Save at most 68 bytes of the packet in case
1.1 cgd 1098: * we need to generate an ICMP message to the src.
1099: */
1.34 mycroft 1100: mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1 cgd 1101:
1102: /*
1103: * If forwarding packet using same interface that it came in on,
1104: * perhaps should send a redirect to sender to shortcut a hop.
1105: * Only send redirect if source is sending directly to us,
1106: * and if packet was not source routed (or has any options).
1107: * Also, don't send redirect if forwarding using a default route
1108: * or a route modified by a redirect.
1109: */
1110: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1111: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1112: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1113: ipsendredirects && !srcrt) {
1.19 mycroft 1114: if (rt->rt_ifa &&
1115: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1116: ifatoia(rt->rt_ifa)->ia_subnet) {
1.1 cgd 1117: if (rt->rt_flags & RTF_GATEWAY)
1.13 mycroft 1118: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1.1 cgd 1119: else
1.13 mycroft 1120: dest = ip->ip_dst.s_addr;
1121: /* Router requirements says to only send host redirects */
1.1 cgd 1122: type = ICMP_REDIRECT;
1.13 mycroft 1123: code = ICMP_REDIRECT_HOST;
1.1 cgd 1124: #ifdef DIAGNOSTIC
1125: if (ipprintfs)
1.39 christos 1126: printf("redirect (%d) to %x\n", code, (u_int32_t)dest);
1.1 cgd 1127: #endif
1128: }
1129: }
1130:
1.27 thorpej 1131: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1132: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1133: if (error)
1134: ipstat.ips_cantforward++;
1135: else {
1136: ipstat.ips_forward++;
1137: if (type)
1138: ipstat.ips_redirectsent++;
1139: else {
1140: if (mcopy)
1141: m_freem(mcopy);
1142: return;
1143: }
1144: }
1145: if (mcopy == NULL)
1146: return;
1.13 mycroft 1147: destifp = NULL;
1148:
1.1 cgd 1149: switch (error) {
1150:
1151: case 0: /* forwarded, but need redirect */
1152: /* type, code set above */
1153: break;
1154:
1155: case ENETUNREACH: /* shouldn't happen, checked above */
1156: case EHOSTUNREACH:
1157: case ENETDOWN:
1158: case EHOSTDOWN:
1159: default:
1160: type = ICMP_UNREACH;
1161: code = ICMP_UNREACH_HOST;
1162: break;
1163:
1164: case EMSGSIZE:
1165: type = ICMP_UNREACH;
1166: code = ICMP_UNREACH_NEEDFRAG;
1.13 mycroft 1167: if (ipforward_rt.ro_rt)
1168: destifp = ipforward_rt.ro_rt->rt_ifp;
1.1 cgd 1169: ipstat.ips_cantfrag++;
1170: break;
1171:
1172: case ENOBUFS:
1173: type = ICMP_SOURCEQUENCH;
1174: code = 0;
1175: break;
1176: }
1.13 mycroft 1177: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1178: }
1179:
1180: void
1181: ip_savecontrol(inp, mp, ip, m)
1182: register struct inpcb *inp;
1183: register struct mbuf **mp;
1184: register struct ip *ip;
1185: register struct mbuf *m;
1186: {
1187:
1188: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1189: struct timeval tv;
1190:
1191: microtime(&tv);
1192: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1193: SCM_TIMESTAMP, SOL_SOCKET);
1194: if (*mp)
1195: mp = &(*mp)->m_next;
1196: }
1197: if (inp->inp_flags & INP_RECVDSTADDR) {
1198: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1199: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1200: if (*mp)
1201: mp = &(*mp)->m_next;
1202: }
1203: #ifdef notyet
1204: /*
1205: * XXX
1206: * Moving these out of udp_input() made them even more broken
1207: * than they already were.
1208: * - fenner@parc.xerox.com
1209: */
1210: /* options were tossed already */
1211: if (inp->inp_flags & INP_RECVOPTS) {
1212: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1213: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1214: if (*mp)
1215: mp = &(*mp)->m_next;
1216: }
1217: /* ip_srcroute doesn't do what we want here, need to fix */
1218: if (inp->inp_flags & INP_RECVRETOPTS) {
1219: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1220: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1221: if (*mp)
1222: mp = &(*mp)->m_next;
1223: }
1224: #endif
1225: if (inp->inp_flags & INP_RECVIF) {
1226: struct sockaddr_dl sdl;
1227:
1228: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1229: sdl.sdl_family = AF_LINK;
1230: sdl.sdl_index = m->m_pkthdr.rcvif ?
1231: m->m_pkthdr.rcvif->if_index : 0;
1232: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1233: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1234: IP_RECVIF, IPPROTO_IP);
1235: if (*mp)
1236: mp = &(*mp)->m_next;
1237: }
1.13 mycroft 1238: }
1239:
1240: int
1241: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1242: int *name;
1243: u_int namelen;
1244: void *oldp;
1245: size_t *oldlenp;
1246: void *newp;
1247: size_t newlen;
1248: {
1.52 thorpej 1249: extern int subnetsarelocal;
1250:
1.54 lukem 1251: int error, old;
1252:
1.13 mycroft 1253: /* All sysctl names at this level are terminal. */
1254: if (namelen != 1)
1255: return (ENOTDIR);
1256:
1257: switch (name[0]) {
1258: case IPCTL_FORWARDING:
1259: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1260: case IPCTL_SENDREDIRECTS:
1261: return (sysctl_int(oldp, oldlenp, newp, newlen,
1262: &ipsendredirects));
1263: case IPCTL_DEFTTL:
1264: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1265: #ifdef notyet
1266: case IPCTL_DEFMTU:
1267: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1268: #endif
1.26 thorpej 1269: case IPCTL_FORWSRCRT:
1.47 cjs 1270: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1271: if (securelevel > 0)
1.46 cjs 1272: return (sysctl_rdint(oldp, oldlenp, newp,
1273: ip_forwsrcrt));
1274: else
1275: return (sysctl_int(oldp, oldlenp, newp, newlen,
1276: &ip_forwsrcrt));
1.27 thorpej 1277: case IPCTL_DIRECTEDBCAST:
1278: return (sysctl_int(oldp, oldlenp, newp, newlen,
1279: &ip_directedbcast));
1.47 cjs 1280: case IPCTL_ALLOWSRCRT:
1281: return (sysctl_int(oldp, oldlenp, newp, newlen,
1282: &ip_allowsrcrt));
1.52 thorpej 1283: case IPCTL_SUBNETSARELOCAL:
1284: return (sysctl_int(oldp, oldlenp, newp, newlen,
1285: &subnetsarelocal));
1.53 kml 1286: case IPCTL_MTUDISC:
1.54 lukem 1287: return (sysctl_int(oldp, oldlenp, newp, newlen,
1.53 kml 1288: &ip_mtudisc));
1.54 lukem 1289: case IPCTL_ANONPORTMIN:
1290: old = anonportmin;
1291: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1292: if (anonportmin >= anonportmax || anonportmin > 65535
1293: #ifndef IPNOPRIVPORTS
1294: || anonportmin < IPPORT_RESERVED
1295: #endif
1296: ) {
1297: anonportmin = old;
1298: return (EINVAL);
1299: }
1300: return (error);
1301: case IPCTL_ANONPORTMAX:
1302: old = anonportmax;
1303: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1304: if (anonportmin >= anonportmax || anonportmax > 65535
1305: #ifndef IPNOPRIVPORTS
1306: || anonportmax < IPPORT_RESERVED
1307: #endif
1308: ) {
1309: anonportmax = old;
1310: return (EINVAL);
1311: }
1312: return (error);
1.13 mycroft 1313: default:
1314: return (EOPNOTSUPP);
1315: }
1316: /* NOTREACHED */
1.1 cgd 1317: }
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