Annotation of src/sys/netinet/ip_input.c, Revision 1.48
1.48 ! mrg 1: /* $NetBSD: ip_input.c,v 1.47 1997/02/25 08:35:42 cjs 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
1.27 thorpej 86: /*
87: * Note: DIRECTED_BROADCAST is handled this way so that previous
88: * configuration using this option will Just Work.
89: */
90: #ifndef IPDIRECTEDBCAST
91: #ifdef DIRECTED_BROADCAST
92: #define IPDIRECTEDBCAST 1
93: #else
94: #define IPDIRECTEDBCAST 0
95: #endif /* DIRECTED_BROADCAST */
96: #endif /* IPDIRECTEDBCAST */
1.1 cgd 97: int ipforwarding = IPFORWARDING;
98: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 99: int ip_defttl = IPDEFTTL;
1.26 thorpej 100: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 101: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 102: int ip_allowsrcrt = IPALLOWSRCRT;
1.1 cgd 103: #ifdef DIAGNOSTIC
104: int ipprintfs = 0;
105: #endif
106:
107: extern struct domain inetdomain;
108: extern struct protosw inetsw[];
109: u_char ip_protox[IPPROTO_MAX];
110: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 111: struct in_ifaddrhead in_ifaddr;
1.13 mycroft 112: struct ifqueue ipintrq;
1.1 cgd 113:
114: /*
115: * We need to save the IP options in case a protocol wants to respond
116: * to an incoming packet over the same route if the packet got here
117: * using IP source routing. This allows connection establishment and
118: * maintenance when the remote end is on a network that is not known
119: * to us.
120: */
121: int ip_nhops = 0;
122: static struct ip_srcrt {
123: struct in_addr dst; /* final destination */
124: char nop; /* one NOP to align */
125: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
126: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
127: } ip_srcrt;
128:
1.13 mycroft 129: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 130:
1.1 cgd 131: /*
132: * IP initialization: fill in IP protocol switch table.
133: * All protocols not implemented in kernel go to raw IP protocol handler.
134: */
1.8 mycroft 135: void
1.1 cgd 136: ip_init()
137: {
138: register struct protosw *pr;
139: register int i;
140:
141: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
142: if (pr == 0)
143: panic("ip_init");
144: for (i = 0; i < IPPROTO_MAX; i++)
145: ip_protox[i] = pr - inetsw;
146: for (pr = inetdomain.dom_protosw;
147: pr < inetdomain.dom_protoswNPROTOSW; pr++)
148: if (pr->pr_domain->dom_family == PF_INET &&
149: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
150: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 151: LIST_INIT(&ipq);
1.1 cgd 152: ip_id = time.tv_sec & 0xffff;
153: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 154: TAILQ_INIT(&in_ifaddr);
1.1 cgd 155: }
156:
157: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
158: struct route ipforward_rt;
159:
160: /*
161: * Ip input routine. Checksum and byte swap header. If fragmented
162: * try to reassemble. Process options. Pass to next level.
163: */
1.8 mycroft 164: void
1.1 cgd 165: ipintr()
166: {
1.33 mrg 167: register struct ip *ip = NULL;
1.1 cgd 168: register struct mbuf *m;
169: register struct ipq *fp;
170: register struct in_ifaddr *ia;
1.25 cgd 171: struct ipqent *ipqe;
1.35 mycroft 172: int hlen = 0, mff, len, s;
1.36 mrg 173: #ifdef PFIL_HOOKS
1.33 mrg 174: struct packet_filter_hook *pfh;
175: struct mbuf *m0;
1.43 mrg 176: int rv;
1.36 mrg 177: #endif /* PFIL_HOOKS */
1.1 cgd 178:
179: next:
180: /*
181: * Get next datagram off input queue and get IP header
182: * in first mbuf.
183: */
184: s = splimp();
185: IF_DEQUEUE(&ipintrq, m);
186: splx(s);
1.13 mycroft 187: if (m == 0)
1.1 cgd 188: return;
189: #ifdef DIAGNOSTIC
190: if ((m->m_flags & M_PKTHDR) == 0)
191: panic("ipintr no HDR");
192: #endif
193: /*
194: * If no IP addresses have been set yet but the interfaces
195: * are receiving, can't do anything with incoming packets yet.
196: */
1.22 mycroft 197: if (in_ifaddr.tqh_first == 0)
1.1 cgd 198: goto bad;
199: ipstat.ips_total++;
200: if (m->m_len < sizeof (struct ip) &&
201: (m = m_pullup(m, sizeof (struct ip))) == 0) {
202: ipstat.ips_toosmall++;
203: goto next;
204: }
205: ip = mtod(m, struct ip *);
1.13 mycroft 206: if (ip->ip_v != IPVERSION) {
207: ipstat.ips_badvers++;
208: goto bad;
209: }
1.1 cgd 210: hlen = ip->ip_hl << 2;
211: if (hlen < sizeof(struct ip)) { /* minimum header length */
212: ipstat.ips_badhlen++;
213: goto bad;
214: }
215: if (hlen > m->m_len) {
216: if ((m = m_pullup(m, hlen)) == 0) {
217: ipstat.ips_badhlen++;
218: goto next;
219: }
220: ip = mtod(m, struct ip *);
221: }
1.28 christos 222: if ((ip->ip_sum = in_cksum(m, hlen)) != 0) {
1.1 cgd 223: ipstat.ips_badsum++;
224: goto bad;
225: }
226:
227: /*
228: * Convert fields to host representation.
229: */
230: NTOHS(ip->ip_len);
231: NTOHS(ip->ip_id);
232: NTOHS(ip->ip_off);
1.35 mycroft 233: len = ip->ip_len;
1.1 cgd 234:
235: /*
236: * Check that the amount of data in the buffers
237: * is as at least much as the IP header would have us expect.
238: * Trim mbufs if longer than we expect.
239: * Drop packet if shorter than we expect.
240: */
1.35 mycroft 241: if (m->m_pkthdr.len < len) {
1.1 cgd 242: ipstat.ips_tooshort++;
243: goto bad;
244: }
1.35 mycroft 245: if (m->m_pkthdr.len > len) {
1.1 cgd 246: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 247: m->m_len = len;
248: m->m_pkthdr.len = len;
1.1 cgd 249: } else
1.35 mycroft 250: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 251: }
252:
1.36 mrg 253: #ifdef PFIL_HOOKS
1.33 mrg 254: /*
255: * Run through list of hooks for input packets.
256: */
257: m0 = m;
258: for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.le_next)
259: if (pfh->pfil_func) {
1.43 mrg 260: rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0);
261: ip = mtod(m = m0, struct ip *);
262: if (rv)
1.40 veego 263: goto next;
1.33 mrg 264: }
1.36 mrg 265: #endif /* PFIL_HOOKS */
1.33 mrg 266:
1.1 cgd 267: /*
268: * Process options and, if not destined for us,
269: * ship it on. ip_dooptions returns 1 when an
270: * error was detected (causing an icmp message
271: * to be sent and the original packet to be freed).
272: */
273: ip_nhops = 0; /* for source routed packets */
274: if (hlen > sizeof (struct ip) && ip_dooptions(m))
275: goto next;
276:
277: /*
278: * Check our list of addresses, to see if the packet is for us.
279: */
1.22 mycroft 280: for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) {
1.35 mycroft 281: if (in_hosteq(ip->ip_dst, ia->ia_addr.sin_addr))
1.1 cgd 282: goto ours;
1.27 thorpej 283: if (((ip_directedbcast == 0) || (ip_directedbcast &&
284: ia->ia_ifp == m->m_pkthdr.rcvif)) &&
1.1 cgd 285: (ia->ia_ifp->if_flags & IFF_BROADCAST)) {
1.35 mycroft 286: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
287: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 288: /*
289: * Look for all-0's host part (old broadcast addr),
290: * either for subnet or net.
291: */
292: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 293: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 294: goto ours;
295: }
296: }
1.18 mycroft 297: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 298: struct in_multi *inm;
299: #ifdef MROUTING
300: extern struct socket *ip_mrouter;
1.10 brezak 301:
302: if (m->m_flags & M_EXT) {
303: if ((m = m_pullup(m, hlen)) == 0) {
304: ipstat.ips_toosmall++;
305: goto next;
306: }
307: ip = mtod(m, struct ip *);
308: }
1.4 hpeyerl 309:
310: if (ip_mrouter) {
311: /*
312: * If we are acting as a multicast router, all
313: * incoming multicast packets are passed to the
314: * kernel-level multicast forwarding function.
315: * The packet is returned (relatively) intact; if
316: * ip_mforward() returns a non-zero value, the packet
317: * must be discarded, else it may be accepted below.
318: *
319: * (The IP ident field is put in the same byte order
320: * as expected when ip_mforward() is called from
321: * ip_output().)
322: */
323: ip->ip_id = htons(ip->ip_id);
1.13 mycroft 324: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
325: ipstat.ips_cantforward++;
1.4 hpeyerl 326: m_freem(m);
327: goto next;
328: }
329: ip->ip_id = ntohs(ip->ip_id);
330:
331: /*
332: * The process-level routing demon needs to receive
333: * all multicast IGMP packets, whether or not this
334: * host belongs to their destination groups.
335: */
336: if (ip->ip_p == IPPROTO_IGMP)
337: goto ours;
1.13 mycroft 338: ipstat.ips_forward++;
1.4 hpeyerl 339: }
340: #endif
341: /*
342: * See if we belong to the destination multicast group on the
343: * arrival interface.
344: */
345: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
346: if (inm == NULL) {
1.13 mycroft 347: ipstat.ips_cantforward++;
1.4 hpeyerl 348: m_freem(m);
349: goto next;
350: }
351: goto ours;
352: }
1.19 mycroft 353: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 354: in_nullhost(ip->ip_dst))
1.1 cgd 355: goto ours;
356:
357: /*
358: * Not for us; forward if possible and desirable.
359: */
360: if (ipforwarding == 0) {
361: ipstat.ips_cantforward++;
362: m_freem(m);
363: } else
364: ip_forward(m, 0);
365: goto next;
366:
367: ours:
368: /*
369: * If offset or IP_MF are set, must reassemble.
370: * Otherwise, nothing need be done.
371: * (We could look in the reassembly queue to see
372: * if the packet was previously fragmented,
373: * but it's not worth the time; just let them time out.)
374: */
1.37 perry 375: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 376: if (m->m_flags & M_EXT) { /* XXX */
377: if ((m = m_pullup(m, sizeof (struct ip))) == 0) {
378: ipstat.ips_toosmall++;
379: goto next;
380: }
381: ip = mtod(m, struct ip *);
382: }
383: /*
384: * Look for queue of fragments
385: * of this datagram.
386: */
1.25 cgd 387: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 388: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 389: in_hosteq(ip->ip_src, fp->ipq_src) &&
390: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 391: ip->ip_p == fp->ipq_p)
392: goto found;
393: fp = 0;
394: found:
395:
396: /*
397: * Adjust ip_len to not reflect header,
1.25 cgd 398: * set ipqe_mff if more fragments are expected,
1.1 cgd 399: * convert offset of this to bytes.
400: */
401: ip->ip_len -= hlen;
1.25 cgd 402: mff = (ip->ip_off & IP_MF) != 0;
403: if (mff) {
1.16 cgd 404: /*
405: * Make sure that fragments have a data length
406: * that's a non-zero multiple of 8 bytes.
407: */
1.17 cgd 408: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 409: ipstat.ips_badfrags++;
410: goto bad;
411: }
412: }
1.1 cgd 413: ip->ip_off <<= 3;
414:
415: /*
416: * If datagram marked as having more fragments
417: * or if this is not the first fragment,
418: * attempt reassembly; if it succeeds, proceed.
419: */
1.25 cgd 420: if (mff || ip->ip_off) {
1.1 cgd 421: ipstat.ips_fragments++;
1.25 cgd 422: MALLOC(ipqe, struct ipqent *, sizeof (struct ipqent),
423: M_IPQ, M_NOWAIT);
424: if (ipqe == NULL) {
425: ipstat.ips_rcvmemdrop++;
426: goto bad;
427: }
428: ipqe->ipqe_mff = mff;
429: ipqe->ipqe_ip = ip;
430: ip = ip_reass(ipqe, fp);
1.1 cgd 431: if (ip == 0)
432: goto next;
1.13 mycroft 433: ipstat.ips_reassembled++;
1.1 cgd 434: m = dtom(ip);
435: } else
436: if (fp)
437: ip_freef(fp);
438: } else
439: ip->ip_len -= hlen;
440:
441: /*
442: * Switch out to protocol's input routine.
443: */
444: ipstat.ips_delivered++;
445: (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
446: goto next;
447: bad:
448: m_freem(m);
449: goto next;
450: }
451:
452: /*
453: * Take incoming datagram fragment and try to
454: * reassemble it into whole datagram. If a chain for
455: * reassembly of this datagram already exists, then it
456: * is given as fp; otherwise have to make a chain.
457: */
458: struct ip *
1.25 cgd 459: ip_reass(ipqe, fp)
460: register struct ipqent *ipqe;
1.1 cgd 461: register struct ipq *fp;
462: {
1.25 cgd 463: register struct mbuf *m = dtom(ipqe->ipqe_ip);
464: register struct ipqent *nq, *p, *q;
465: struct ip *ip;
1.1 cgd 466: struct mbuf *t;
1.25 cgd 467: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 468: int i, next;
469:
470: /*
471: * Presence of header sizes in mbufs
472: * would confuse code below.
473: */
474: m->m_data += hlen;
475: m->m_len -= hlen;
476:
477: /*
478: * If first fragment to arrive, create a reassembly queue.
479: */
480: if (fp == 0) {
481: if ((t = m_get(M_DONTWAIT, MT_FTABLE)) == NULL)
482: goto dropfrag;
483: fp = mtod(t, struct ipq *);
1.25 cgd 484: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 485: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 486: fp->ipq_p = ipqe->ipqe_ip->ip_p;
487: fp->ipq_id = ipqe->ipqe_ip->ip_id;
488: LIST_INIT(&fp->ipq_fragq);
489: fp->ipq_src = ipqe->ipqe_ip->ip_src;
490: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
491: p = NULL;
1.1 cgd 492: goto insert;
493: }
494:
495: /*
496: * Find a segment which begins after this one does.
497: */
1.25 cgd 498: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
499: p = q, q = q->ipqe_q.le_next)
500: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 501: break;
502:
503: /*
504: * If there is a preceding segment, it may provide some of
505: * our data already. If so, drop the data from the incoming
506: * segment. If it provides all of our data, drop us.
507: */
1.25 cgd 508: if (p != NULL) {
509: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
510: ipqe->ipqe_ip->ip_off;
1.1 cgd 511: if (i > 0) {
1.25 cgd 512: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 513: goto dropfrag;
1.25 cgd 514: m_adj(dtom(ipqe->ipqe_ip), i);
515: ipqe->ipqe_ip->ip_off += i;
516: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 517: }
518: }
519:
520: /*
521: * While we overlap succeeding segments trim them or,
522: * if they are completely covered, dequeue them.
523: */
1.25 cgd 524: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
525: q->ipqe_ip->ip_off; q = nq) {
526: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
527: q->ipqe_ip->ip_off;
528: if (i < q->ipqe_ip->ip_len) {
529: q->ipqe_ip->ip_len -= i;
530: q->ipqe_ip->ip_off += i;
531: m_adj(dtom(q->ipqe_ip), i);
1.1 cgd 532: break;
533: }
1.25 cgd 534: nq = q->ipqe_q.le_next;
535: m_freem(dtom(q->ipqe_ip));
536: LIST_REMOVE(q, ipqe_q);
537: FREE(q, M_IPQ);
1.1 cgd 538: }
539:
540: insert:
541: /*
542: * Stick new segment in its place;
543: * check for complete reassembly.
544: */
1.25 cgd 545: if (p == NULL) {
546: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
547: } else {
548: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
549: }
1.1 cgd 550: next = 0;
1.25 cgd 551: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
552: p = q, q = q->ipqe_q.le_next) {
553: if (q->ipqe_ip->ip_off != next)
1.1 cgd 554: return (0);
1.25 cgd 555: next += q->ipqe_ip->ip_len;
1.1 cgd 556: }
1.25 cgd 557: if (p->ipqe_mff)
1.1 cgd 558: return (0);
559:
560: /*
1.41 thorpej 561: * Reassembly is complete. Check for a bogus message size and
562: * concatenate fragments.
1.1 cgd 563: */
1.25 cgd 564: q = fp->ipq_fragq.lh_first;
565: ip = q->ipqe_ip;
1.41 thorpej 566: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
567: ipstat.ips_toolong++;
568: ip_freef(fp);
569: return (0);
570: }
1.25 cgd 571: m = dtom(q->ipqe_ip);
1.1 cgd 572: t = m->m_next;
573: m->m_next = 0;
574: m_cat(m, t);
1.25 cgd 575: nq = q->ipqe_q.le_next;
576: FREE(q, M_IPQ);
577: for (q = nq; q != NULL; q = nq) {
578: t = dtom(q->ipqe_ip);
579: nq = q->ipqe_q.le_next;
580: FREE(q, M_IPQ);
1.1 cgd 581: m_cat(m, t);
582: }
583:
584: /*
585: * Create header for new ip packet by
586: * modifying header of first packet;
587: * dequeue and discard fragment reassembly header.
588: * Make header visible.
589: */
590: ip->ip_len = next;
1.25 cgd 591: ip->ip_src = fp->ipq_src;
592: ip->ip_dst = fp->ipq_dst;
593: LIST_REMOVE(fp, ipq_q);
1.1 cgd 594: (void) m_free(dtom(fp));
595: m->m_len += (ip->ip_hl << 2);
596: m->m_data -= (ip->ip_hl << 2);
597: /* some debugging cruft by sklower, below, will go away soon */
598: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
599: register int plen = 0;
600: for (t = m; m; m = m->m_next)
601: plen += m->m_len;
602: t->m_pkthdr.len = plen;
603: }
1.25 cgd 604: return (ip);
1.1 cgd 605:
606: dropfrag:
607: ipstat.ips_fragdropped++;
608: m_freem(m);
1.25 cgd 609: FREE(ipqe, M_IPQ);
1.1 cgd 610: return (0);
611: }
612:
613: /*
614: * Free a fragment reassembly header and all
615: * associated datagrams.
616: */
1.8 mycroft 617: void
1.1 cgd 618: ip_freef(fp)
619: struct ipq *fp;
620: {
1.25 cgd 621: register struct ipqent *q, *p;
1.1 cgd 622:
1.25 cgd 623: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
624: p = q->ipqe_q.le_next;
625: m_freem(dtom(q->ipqe_ip));
626: LIST_REMOVE(q, ipqe_q);
627: FREE(q, M_IPQ);
1.1 cgd 628: }
1.25 cgd 629: LIST_REMOVE(fp, ipq_q);
1.1 cgd 630: (void) m_free(dtom(fp));
631: }
632:
633: /*
634: * IP timer processing;
635: * if a timer expires on a reassembly
636: * queue, discard it.
637: */
1.8 mycroft 638: void
1.1 cgd 639: ip_slowtimo()
640: {
1.25 cgd 641: register struct ipq *fp, *nfp;
1.24 mycroft 642: int s = splsoftnet();
1.1 cgd 643:
1.25 cgd 644: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
645: nfp = fp->ipq_q.le_next;
646: if (--fp->ipq_ttl == 0) {
1.1 cgd 647: ipstat.ips_fragtimeout++;
1.25 cgd 648: ip_freef(fp);
1.1 cgd 649: }
650: }
651: splx(s);
652: }
653:
654: /*
655: * Drain off all datagram fragments.
656: */
1.8 mycroft 657: void
1.1 cgd 658: ip_drain()
659: {
660:
1.25 cgd 661: while (ipq.lh_first != NULL) {
1.1 cgd 662: ipstat.ips_fragdropped++;
1.25 cgd 663: ip_freef(ipq.lh_first);
1.1 cgd 664: }
665: }
666:
667: /*
668: * Do option processing on a datagram,
669: * possibly discarding it if bad options are encountered,
670: * or forwarding it if source-routed.
671: * Returns 1 if packet has been forwarded/freed,
672: * 0 if the packet should be processed further.
673: */
1.8 mycroft 674: int
1.1 cgd 675: ip_dooptions(m)
676: struct mbuf *m;
677: {
678: register struct ip *ip = mtod(m, struct ip *);
679: register u_char *cp;
680: register struct ip_timestamp *ipt;
681: register struct in_ifaddr *ia;
682: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.13 mycroft 683: struct in_addr *sin, dst;
1.1 cgd 684: n_time ntime;
685:
1.13 mycroft 686: dst = ip->ip_dst;
1.1 cgd 687: cp = (u_char *)(ip + 1);
688: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
689: for (; cnt > 0; cnt -= optlen, cp += optlen) {
690: opt = cp[IPOPT_OPTVAL];
691: if (opt == IPOPT_EOL)
692: break;
693: if (opt == IPOPT_NOP)
694: optlen = 1;
695: else {
696: optlen = cp[IPOPT_OLEN];
697: if (optlen <= 0 || optlen > cnt) {
698: code = &cp[IPOPT_OLEN] - (u_char *)ip;
699: goto bad;
700: }
701: }
702: switch (opt) {
703:
704: default:
705: break;
706:
707: /*
708: * Source routing with record.
709: * Find interface with current destination address.
710: * If none on this machine then drop if strictly routed,
711: * or do nothing if loosely routed.
712: * Record interface address and bring up next address
713: * component. If strictly routed make sure next
714: * address is on directly accessible net.
715: */
716: case IPOPT_LSRR:
717: case IPOPT_SSRR:
1.47 cjs 718: if (ip_allowsrcrt == 0) {
719: type = ICMP_UNREACH;
720: code = ICMP_UNREACH_NET_PROHIB;
721: goto bad;
722: }
1.1 cgd 723: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
724: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
725: goto bad;
726: }
727: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 728: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 729: if (ia == 0) {
730: if (opt == IPOPT_SSRR) {
731: type = ICMP_UNREACH;
732: code = ICMP_UNREACH_SRCFAIL;
733: goto bad;
734: }
735: /*
736: * Loose routing, and not at next destination
737: * yet; nothing to do except forward.
738: */
739: break;
740: }
741: off--; /* 0 origin */
742: if (off > optlen - sizeof(struct in_addr)) {
743: /*
744: * End of source route. Should be for us.
745: */
746: save_rte(cp, ip->ip_src);
747: break;
748: }
749: /*
750: * locate outgoing interface
751: */
752: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
753: sizeof(ipaddr.sin_addr));
754: if (opt == IPOPT_SSRR) {
755: #define INA struct in_ifaddr *
756: #define SA struct sockaddr *
1.29 mrg 757: ia = (INA)ifa_ifwithladdr((SA)&ipaddr);
1.1 cgd 758: } else
759: ia = ip_rtaddr(ipaddr.sin_addr);
760: if (ia == 0) {
761: type = ICMP_UNREACH;
762: code = ICMP_UNREACH_SRCFAIL;
763: goto bad;
764: }
765: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 766: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 767: (caddr_t)(cp + off), sizeof(struct in_addr));
768: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 769: /*
770: * Let ip_intr's mcast routing check handle mcast pkts
771: */
1.18 mycroft 772: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 773: break;
774:
775: case IPOPT_RR:
776: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
777: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
778: goto bad;
779: }
780: /*
781: * If no space remains, ignore.
782: */
783: off--; /* 0 origin */
784: if (off > optlen - sizeof(struct in_addr))
785: break;
786: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
787: sizeof(ipaddr.sin_addr));
788: /*
789: * locate outgoing interface; if we're the destination,
790: * use the incoming interface (should be same).
791: */
792: if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
793: (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
794: type = ICMP_UNREACH;
795: code = ICMP_UNREACH_HOST;
796: goto bad;
797: }
1.20 mycroft 798: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 799: (caddr_t)(cp + off), sizeof(struct in_addr));
800: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
801: break;
802:
803: case IPOPT_TS:
804: code = cp - (u_char *)ip;
805: ipt = (struct ip_timestamp *)cp;
806: if (ipt->ipt_len < 5)
807: goto bad;
1.15 cgd 808: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1 cgd 809: if (++ipt->ipt_oflw == 0)
810: goto bad;
811: break;
812: }
813: sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
814: switch (ipt->ipt_flg) {
815:
816: case IPOPT_TS_TSONLY:
817: break;
818:
819: case IPOPT_TS_TSANDADDR:
820: if (ipt->ipt_ptr + sizeof(n_time) +
821: sizeof(struct in_addr) > ipt->ipt_len)
822: goto bad;
1.13 mycroft 823: ipaddr.sin_addr = dst;
824: ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
825: m->m_pkthdr.rcvif);
826: if (ia == 0)
827: continue;
1.20 mycroft 828: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 829: (caddr_t)sin, sizeof(struct in_addr));
830: ipt->ipt_ptr += sizeof(struct in_addr);
831: break;
832:
833: case IPOPT_TS_PRESPEC:
834: if (ipt->ipt_ptr + sizeof(n_time) +
835: sizeof(struct in_addr) > ipt->ipt_len)
836: goto bad;
837: bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
838: sizeof(struct in_addr));
839: if (ifa_ifwithaddr((SA)&ipaddr) == 0)
840: continue;
841: ipt->ipt_ptr += sizeof(struct in_addr);
842: break;
843:
844: default:
845: goto bad;
846: }
847: ntime = iptime();
848: bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
849: sizeof(n_time));
850: ipt->ipt_ptr += sizeof(n_time);
851: }
852: }
853: if (forward) {
1.26 thorpej 854: if (ip_forwsrcrt == 0) {
855: type = ICMP_UNREACH;
856: code = ICMP_UNREACH_SRCFAIL;
857: goto bad;
858: }
1.1 cgd 859: ip_forward(m, 1);
860: return (1);
1.13 mycroft 861: }
862: return (0);
1.1 cgd 863: bad:
1.13 mycroft 864: ip->ip_len -= ip->ip_hl << 2; /* XXX icmp_error adds in hdr length */
865: icmp_error(m, type, code, 0, 0);
866: ipstat.ips_badoptions++;
1.1 cgd 867: return (1);
868: }
869:
870: /*
871: * Given address of next destination (final or next hop),
872: * return internet address info of interface to be used to get there.
873: */
874: struct in_ifaddr *
875: ip_rtaddr(dst)
876: struct in_addr dst;
877: {
878: register struct sockaddr_in *sin;
879:
1.19 mycroft 880: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 881:
1.35 mycroft 882: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 883: if (ipforward_rt.ro_rt) {
884: RTFREE(ipforward_rt.ro_rt);
885: ipforward_rt.ro_rt = 0;
886: }
887: sin->sin_family = AF_INET;
888: sin->sin_len = sizeof(*sin);
889: sin->sin_addr = dst;
890:
891: rtalloc(&ipforward_rt);
892: }
893: if (ipforward_rt.ro_rt == 0)
894: return ((struct in_ifaddr *)0);
1.19 mycroft 895: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 896: }
897:
898: /*
899: * Save incoming source route for use in replies,
900: * to be picked up later by ip_srcroute if the receiver is interested.
901: */
1.13 mycroft 902: void
1.1 cgd 903: save_rte(option, dst)
904: u_char *option;
905: struct in_addr dst;
906: {
907: unsigned olen;
908:
909: olen = option[IPOPT_OLEN];
910: #ifdef DIAGNOSTIC
911: if (ipprintfs)
1.39 christos 912: printf("save_rte: olen %d\n", olen);
1.1 cgd 913: #endif
914: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
915: return;
916: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
917: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
918: ip_srcrt.dst = dst;
919: }
920:
921: /*
922: * Retrieve incoming source route for use in replies,
923: * in the same form used by setsockopt.
924: * The first hop is placed before the options, will be removed later.
925: */
926: struct mbuf *
927: ip_srcroute()
928: {
929: register struct in_addr *p, *q;
930: register struct mbuf *m;
931:
932: if (ip_nhops == 0)
933: return ((struct mbuf *)0);
934: m = m_get(M_DONTWAIT, MT_SOOPTS);
935: if (m == 0)
936: return ((struct mbuf *)0);
937:
1.13 mycroft 938: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 939:
940: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
941: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
942: OPTSIZ;
943: #ifdef DIAGNOSTIC
944: if (ipprintfs)
1.39 christos 945: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 946: #endif
947:
948: /*
949: * First save first hop for return route
950: */
951: p = &ip_srcrt.route[ip_nhops - 1];
952: *(mtod(m, struct in_addr *)) = *p--;
953: #ifdef DIAGNOSTIC
954: if (ipprintfs)
1.39 christos 955: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 956: #endif
957:
958: /*
959: * Copy option fields and padding (nop) to mbuf.
960: */
961: ip_srcrt.nop = IPOPT_NOP;
962: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
963: bcopy((caddr_t)&ip_srcrt.nop,
964: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
965: q = (struct in_addr *)(mtod(m, caddr_t) +
966: sizeof(struct in_addr) + OPTSIZ);
967: #undef OPTSIZ
968: /*
969: * Record return path as an IP source route,
970: * reversing the path (pointers are now aligned).
971: */
972: while (p >= ip_srcrt.route) {
973: #ifdef DIAGNOSTIC
974: if (ipprintfs)
1.39 christos 975: printf(" %x", ntohl(q->s_addr));
1.1 cgd 976: #endif
977: *q++ = *p--;
978: }
979: /*
980: * Last hop goes to final destination.
981: */
982: *q = ip_srcrt.dst;
983: #ifdef DIAGNOSTIC
984: if (ipprintfs)
1.39 christos 985: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 986: #endif
987: return (m);
988: }
989:
990: /*
991: * Strip out IP options, at higher
992: * level protocol in the kernel.
993: * Second argument is buffer to which options
994: * will be moved, and return value is their length.
995: * XXX should be deleted; last arg currently ignored.
996: */
1.8 mycroft 997: void
1.1 cgd 998: ip_stripoptions(m, mopt)
999: register struct mbuf *m;
1000: struct mbuf *mopt;
1001: {
1002: register int i;
1003: struct ip *ip = mtod(m, struct ip *);
1004: register caddr_t opts;
1005: int olen;
1006:
1007: olen = (ip->ip_hl<<2) - sizeof (struct ip);
1008: opts = (caddr_t)(ip + 1);
1009: i = m->m_len - (sizeof (struct ip) + olen);
1010: bcopy(opts + olen, opts, (unsigned)i);
1011: m->m_len -= olen;
1012: if (m->m_flags & M_PKTHDR)
1013: m->m_pkthdr.len -= olen;
1014: ip->ip_hl = sizeof(struct ip) >> 2;
1015: }
1016:
1.23 mycroft 1017: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1018: 0, 0, 0, 0,
1019: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1020: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1021: EMSGSIZE, EHOSTUNREACH, 0, 0,
1022: 0, 0, 0, 0,
1023: ENOPROTOOPT
1024: };
1025:
1026: /*
1027: * Forward a packet. If some error occurs return the sender
1028: * an icmp packet. Note we can't always generate a meaningful
1029: * icmp message because icmp doesn't have a large enough repertoire
1030: * of codes and types.
1031: *
1032: * If not forwarding, just drop the packet. This could be confusing
1033: * if ipforwarding was zero but some routing protocol was advancing
1034: * us as a gateway to somewhere. However, we must let the routing
1035: * protocol deal with that.
1036: *
1037: * The srcrt parameter indicates whether the packet is being forwarded
1038: * via a source route.
1039: */
1.13 mycroft 1040: void
1.1 cgd 1041: ip_forward(m, srcrt)
1042: struct mbuf *m;
1043: int srcrt;
1044: {
1045: register struct ip *ip = mtod(m, struct ip *);
1046: register struct sockaddr_in *sin;
1047: register struct rtentry *rt;
1.28 christos 1048: int error, type = 0, code = 0;
1.1 cgd 1049: struct mbuf *mcopy;
1.13 mycroft 1050: n_long dest;
1051: struct ifnet *destifp;
1.1 cgd 1052:
1.13 mycroft 1053: dest = 0;
1.1 cgd 1054: #ifdef DIAGNOSTIC
1055: if (ipprintfs)
1.39 christos 1056: printf("forward: src %x dst %x ttl %x\n",
1.35 mycroft 1057: ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl);
1.1 cgd 1058: #endif
1059: if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) {
1060: ipstat.ips_cantforward++;
1061: m_freem(m);
1062: return;
1063: }
1064: HTONS(ip->ip_id);
1065: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1066: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1067: return;
1068: }
1069: ip->ip_ttl -= IPTTLDEC;
1070:
1.19 mycroft 1071: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1072: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1073: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1074: if (ipforward_rt.ro_rt) {
1075: RTFREE(ipforward_rt.ro_rt);
1076: ipforward_rt.ro_rt = 0;
1077: }
1078: sin->sin_family = AF_INET;
1.35 mycroft 1079: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1080: sin->sin_addr = ip->ip_dst;
1081:
1082: rtalloc(&ipforward_rt);
1083: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1084: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1085: return;
1086: }
1087: rt = ipforward_rt.ro_rt;
1088: }
1089:
1090: /*
1.34 mycroft 1091: * Save at most 68 bytes of the packet in case
1.1 cgd 1092: * we need to generate an ICMP message to the src.
1093: */
1.34 mycroft 1094: mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1 cgd 1095:
1096: /*
1097: * If forwarding packet using same interface that it came in on,
1098: * perhaps should send a redirect to sender to shortcut a hop.
1099: * Only send redirect if source is sending directly to us,
1100: * and if packet was not source routed (or has any options).
1101: * Also, don't send redirect if forwarding using a default route
1102: * or a route modified by a redirect.
1103: */
1104: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1105: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1106: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1107: ipsendredirects && !srcrt) {
1.19 mycroft 1108: if (rt->rt_ifa &&
1109: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1110: ifatoia(rt->rt_ifa)->ia_subnet) {
1.1 cgd 1111: if (rt->rt_flags & RTF_GATEWAY)
1.13 mycroft 1112: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1.1 cgd 1113: else
1.13 mycroft 1114: dest = ip->ip_dst.s_addr;
1115: /* Router requirements says to only send host redirects */
1.1 cgd 1116: type = ICMP_REDIRECT;
1.13 mycroft 1117: code = ICMP_REDIRECT_HOST;
1.1 cgd 1118: #ifdef DIAGNOSTIC
1119: if (ipprintfs)
1.39 christos 1120: printf("redirect (%d) to %x\n", code, (u_int32_t)dest);
1.1 cgd 1121: #endif
1122: }
1123: }
1124:
1.27 thorpej 1125: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1126: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1127: if (error)
1128: ipstat.ips_cantforward++;
1129: else {
1130: ipstat.ips_forward++;
1131: if (type)
1132: ipstat.ips_redirectsent++;
1133: else {
1134: if (mcopy)
1135: m_freem(mcopy);
1136: return;
1137: }
1138: }
1139: if (mcopy == NULL)
1140: return;
1.13 mycroft 1141: destifp = NULL;
1142:
1.1 cgd 1143: switch (error) {
1144:
1145: case 0: /* forwarded, but need redirect */
1146: /* type, code set above */
1147: break;
1148:
1149: case ENETUNREACH: /* shouldn't happen, checked above */
1150: case EHOSTUNREACH:
1151: case ENETDOWN:
1152: case EHOSTDOWN:
1153: default:
1154: type = ICMP_UNREACH;
1155: code = ICMP_UNREACH_HOST;
1156: break;
1157:
1158: case EMSGSIZE:
1159: type = ICMP_UNREACH;
1160: code = ICMP_UNREACH_NEEDFRAG;
1.13 mycroft 1161: if (ipforward_rt.ro_rt)
1162: destifp = ipforward_rt.ro_rt->rt_ifp;
1.1 cgd 1163: ipstat.ips_cantfrag++;
1164: break;
1165:
1166: case ENOBUFS:
1167: type = ICMP_SOURCEQUENCH;
1168: code = 0;
1169: break;
1170: }
1.13 mycroft 1171: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1172: }
1173:
1174: void
1175: ip_savecontrol(inp, mp, ip, m)
1176: register struct inpcb *inp;
1177: register struct mbuf **mp;
1178: register struct ip *ip;
1179: register struct mbuf *m;
1180: {
1181:
1182: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1183: struct timeval tv;
1184:
1185: microtime(&tv);
1186: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1187: SCM_TIMESTAMP, SOL_SOCKET);
1188: if (*mp)
1189: mp = &(*mp)->m_next;
1190: }
1191: if (inp->inp_flags & INP_RECVDSTADDR) {
1192: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1193: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1194: if (*mp)
1195: mp = &(*mp)->m_next;
1196: }
1197: #ifdef notyet
1198: /*
1199: * XXX
1200: * Moving these out of udp_input() made them even more broken
1201: * than they already were.
1202: * - fenner@parc.xerox.com
1203: */
1204: /* options were tossed already */
1205: if (inp->inp_flags & INP_RECVOPTS) {
1206: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1207: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1208: if (*mp)
1209: mp = &(*mp)->m_next;
1210: }
1211: /* ip_srcroute doesn't do what we want here, need to fix */
1212: if (inp->inp_flags & INP_RECVRETOPTS) {
1213: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1214: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1215: if (*mp)
1216: mp = &(*mp)->m_next;
1217: }
1218: #endif
1219: if (inp->inp_flags & INP_RECVIF) {
1220: struct sockaddr_dl sdl;
1221:
1222: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1223: sdl.sdl_family = AF_LINK;
1224: sdl.sdl_index = m->m_pkthdr.rcvif ?
1225: m->m_pkthdr.rcvif->if_index : 0;
1226: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1227: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1228: IP_RECVIF, IPPROTO_IP);
1229: if (*mp)
1230: mp = &(*mp)->m_next;
1231: }
1.13 mycroft 1232: }
1233:
1234: int
1235: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1236: int *name;
1237: u_int namelen;
1238: void *oldp;
1239: size_t *oldlenp;
1240: void *newp;
1241: size_t newlen;
1242: {
1243: /* All sysctl names at this level are terminal. */
1244: if (namelen != 1)
1245: return (ENOTDIR);
1246:
1247: switch (name[0]) {
1248: case IPCTL_FORWARDING:
1249: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1250: case IPCTL_SENDREDIRECTS:
1251: return (sysctl_int(oldp, oldlenp, newp, newlen,
1252: &ipsendredirects));
1253: case IPCTL_DEFTTL:
1254: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1255: #ifdef notyet
1256: case IPCTL_DEFMTU:
1257: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1258: #endif
1.26 thorpej 1259: case IPCTL_FORWSRCRT:
1.47 cjs 1260: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1261: if (securelevel > 0)
1.46 cjs 1262: return (sysctl_rdint(oldp, oldlenp, newp,
1263: ip_forwsrcrt));
1264: else
1265: return (sysctl_int(oldp, oldlenp, newp, newlen,
1266: &ip_forwsrcrt));
1.27 thorpej 1267: case IPCTL_DIRECTEDBCAST:
1268: return (sysctl_int(oldp, oldlenp, newp, newlen,
1269: &ip_directedbcast));
1.47 cjs 1270: case IPCTL_ALLOWSRCRT:
1271: return (sysctl_int(oldp, oldlenp, newp, newlen,
1272: &ip_allowsrcrt));
1.13 mycroft 1273: default:
1274: return (EOPNOTSUPP);
1275: }
1276: /* NOTREACHED */
1.1 cgd 1277: }
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