Annotation of src/sys/netinet/ip_input.c, Revision 1.44
1.44 ! thorpej 1: /* $NetBSD: ip_input.c,v 1.43 1996/12/20 09:08:14 mrg 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>
1.1 cgd 57:
1.5 mycroft 58: #include <netinet/in.h>
59: #include <netinet/in_systm.h>
60: #include <netinet/ip.h>
61: #include <netinet/in_pcb.h>
62: #include <netinet/in_var.h>
63: #include <netinet/ip_var.h>
64: #include <netinet/ip_icmp.h>
1.1 cgd 65:
1.36 mrg 66: #ifdef PFIL_HOOKS
67: #include <net/pfil.h>
68: #endif /* PFIL_HOOKS */
69:
1.44 ! thorpej 70: /* XXX should really put this in libkern.h */
! 71: #define offsetof(type, member) ((size_t)(&((type *)0)->member))
! 72:
1.1 cgd 73: #ifndef IPFORWARDING
74: #ifdef GATEWAY
75: #define IPFORWARDING 1 /* forward IP packets not for us */
76: #else /* GATEWAY */
77: #define IPFORWARDING 0 /* don't forward IP packets not for us */
78: #endif /* GATEWAY */
79: #endif /* IPFORWARDING */
80: #ifndef IPSENDREDIRECTS
81: #define IPSENDREDIRECTS 1
82: #endif
1.26 thorpej 83: #ifndef IPFORWSRCRT
84: #define IPFORWSRCRT 1 /* allow source-routed packets */
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;
1.1 cgd 102: #ifdef DIAGNOSTIC
103: int ipprintfs = 0;
104: #endif
105:
106: extern struct domain inetdomain;
107: extern struct protosw inetsw[];
108: u_char ip_protox[IPPROTO_MAX];
109: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 110: struct in_ifaddrhead in_ifaddr;
1.13 mycroft 111: struct ifqueue ipintrq;
1.1 cgd 112:
113: /*
114: * We need to save the IP options in case a protocol wants to respond
115: * to an incoming packet over the same route if the packet got here
116: * using IP source routing. This allows connection establishment and
117: * maintenance when the remote end is on a network that is not known
118: * to us.
119: */
120: int ip_nhops = 0;
121: static struct ip_srcrt {
122: struct in_addr dst; /* final destination */
123: char nop; /* one NOP to align */
124: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
125: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
126: } ip_srcrt;
127:
1.13 mycroft 128: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 129:
1.1 cgd 130: /*
131: * IP initialization: fill in IP protocol switch table.
132: * All protocols not implemented in kernel go to raw IP protocol handler.
133: */
1.8 mycroft 134: void
1.1 cgd 135: ip_init()
136: {
137: register struct protosw *pr;
138: register int i;
139:
140: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
141: if (pr == 0)
142: panic("ip_init");
143: for (i = 0; i < IPPROTO_MAX; i++)
144: ip_protox[i] = pr - inetsw;
145: for (pr = inetdomain.dom_protosw;
146: pr < inetdomain.dom_protoswNPROTOSW; pr++)
147: if (pr->pr_domain->dom_family == PF_INET &&
148: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
149: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 150: LIST_INIT(&ipq);
1.1 cgd 151: ip_id = time.tv_sec & 0xffff;
152: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 153: TAILQ_INIT(&in_ifaddr);
1.1 cgd 154: }
155:
156: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
157: struct route ipforward_rt;
158:
159: /*
160: * Ip input routine. Checksum and byte swap header. If fragmented
161: * try to reassemble. Process options. Pass to next level.
162: */
1.8 mycroft 163: void
1.1 cgd 164: ipintr()
165: {
1.33 mrg 166: register struct ip *ip = NULL;
1.1 cgd 167: register struct mbuf *m;
168: register struct ipq *fp;
169: register struct in_ifaddr *ia;
1.25 cgd 170: struct ipqent *ipqe;
1.35 mycroft 171: int hlen = 0, mff, len, s;
1.36 mrg 172: #ifdef PFIL_HOOKS
1.33 mrg 173: struct packet_filter_hook *pfh;
174: struct mbuf *m0;
1.43 mrg 175: int rv;
1.36 mrg 176: #endif /* PFIL_HOOKS */
1.1 cgd 177:
178: next:
179: /*
180: * Get next datagram off input queue and get IP header
181: * in first mbuf.
182: */
183: s = splimp();
184: IF_DEQUEUE(&ipintrq, m);
185: splx(s);
1.13 mycroft 186: if (m == 0)
1.1 cgd 187: return;
188: #ifdef DIAGNOSTIC
189: if ((m->m_flags & M_PKTHDR) == 0)
190: panic("ipintr no HDR");
191: #endif
192: /*
193: * If no IP addresses have been set yet but the interfaces
194: * are receiving, can't do anything with incoming packets yet.
195: */
1.22 mycroft 196: if (in_ifaddr.tqh_first == 0)
1.1 cgd 197: goto bad;
198: ipstat.ips_total++;
199: if (m->m_len < sizeof (struct ip) &&
200: (m = m_pullup(m, sizeof (struct ip))) == 0) {
201: ipstat.ips_toosmall++;
202: goto next;
203: }
204: ip = mtod(m, struct ip *);
1.13 mycroft 205: if (ip->ip_v != IPVERSION) {
206: ipstat.ips_badvers++;
207: goto bad;
208: }
1.1 cgd 209: hlen = ip->ip_hl << 2;
210: if (hlen < sizeof(struct ip)) { /* minimum header length */
211: ipstat.ips_badhlen++;
212: goto bad;
213: }
214: if (hlen > m->m_len) {
215: if ((m = m_pullup(m, hlen)) == 0) {
216: ipstat.ips_badhlen++;
217: goto next;
218: }
219: ip = mtod(m, struct ip *);
220: }
1.28 christos 221: if ((ip->ip_sum = in_cksum(m, hlen)) != 0) {
1.1 cgd 222: ipstat.ips_badsum++;
223: goto bad;
224: }
225:
226: /*
227: * Convert fields to host representation.
228: */
229: NTOHS(ip->ip_len);
230: NTOHS(ip->ip_id);
231: NTOHS(ip->ip_off);
1.35 mycroft 232: len = ip->ip_len;
1.1 cgd 233:
234: /*
235: * Check that the amount of data in the buffers
236: * is as at least much as the IP header would have us expect.
237: * Trim mbufs if longer than we expect.
238: * Drop packet if shorter than we expect.
239: */
1.35 mycroft 240: if (m->m_pkthdr.len < len) {
1.1 cgd 241: ipstat.ips_tooshort++;
242: goto bad;
243: }
1.35 mycroft 244: if (m->m_pkthdr.len > len) {
1.1 cgd 245: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 246: m->m_len = len;
247: m->m_pkthdr.len = len;
1.1 cgd 248: } else
1.35 mycroft 249: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 250: }
251:
1.36 mrg 252: #ifdef PFIL_HOOKS
1.33 mrg 253: /*
254: * Run through list of hooks for input packets.
255: */
256: m0 = m;
257: for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.le_next)
258: if (pfh->pfil_func) {
1.43 mrg 259: rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0);
260: ip = mtod(m = m0, struct ip *);
261: if (rv)
1.40 veego 262: goto next;
1.33 mrg 263: }
1.36 mrg 264: #endif /* PFIL_HOOKS */
1.33 mrg 265:
1.1 cgd 266: /*
267: * Process options and, if not destined for us,
268: * ship it on. ip_dooptions returns 1 when an
269: * error was detected (causing an icmp message
270: * to be sent and the original packet to be freed).
271: */
272: ip_nhops = 0; /* for source routed packets */
273: if (hlen > sizeof (struct ip) && ip_dooptions(m))
274: goto next;
275:
276: /*
277: * Check our list of addresses, to see if the packet is for us.
278: */
1.22 mycroft 279: for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) {
1.35 mycroft 280: if (in_hosteq(ip->ip_dst, ia->ia_addr.sin_addr))
1.1 cgd 281: goto ours;
1.27 thorpej 282: if (((ip_directedbcast == 0) || (ip_directedbcast &&
283: ia->ia_ifp == m->m_pkthdr.rcvif)) &&
1.1 cgd 284: (ia->ia_ifp->if_flags & IFF_BROADCAST)) {
1.35 mycroft 285: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
286: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 287: /*
288: * Look for all-0's host part (old broadcast addr),
289: * either for subnet or net.
290: */
291: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 292: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 293: goto ours;
294: }
295: }
1.18 mycroft 296: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 297: struct in_multi *inm;
298: #ifdef MROUTING
299: extern struct socket *ip_mrouter;
1.10 brezak 300:
301: if (m->m_flags & M_EXT) {
302: if ((m = m_pullup(m, hlen)) == 0) {
303: ipstat.ips_toosmall++;
304: goto next;
305: }
306: ip = mtod(m, struct ip *);
307: }
1.4 hpeyerl 308:
309: if (ip_mrouter) {
310: /*
311: * If we are acting as a multicast router, all
312: * incoming multicast packets are passed to the
313: * kernel-level multicast forwarding function.
314: * The packet is returned (relatively) intact; if
315: * ip_mforward() returns a non-zero value, the packet
316: * must be discarded, else it may be accepted below.
317: *
318: * (The IP ident field is put in the same byte order
319: * as expected when ip_mforward() is called from
320: * ip_output().)
321: */
322: ip->ip_id = htons(ip->ip_id);
1.13 mycroft 323: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
324: ipstat.ips_cantforward++;
1.4 hpeyerl 325: m_freem(m);
326: goto next;
327: }
328: ip->ip_id = ntohs(ip->ip_id);
329:
330: /*
331: * The process-level routing demon needs to receive
332: * all multicast IGMP packets, whether or not this
333: * host belongs to their destination groups.
334: */
335: if (ip->ip_p == IPPROTO_IGMP)
336: goto ours;
1.13 mycroft 337: ipstat.ips_forward++;
1.4 hpeyerl 338: }
339: #endif
340: /*
341: * See if we belong to the destination multicast group on the
342: * arrival interface.
343: */
344: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
345: if (inm == NULL) {
1.13 mycroft 346: ipstat.ips_cantforward++;
1.4 hpeyerl 347: m_freem(m);
348: goto next;
349: }
350: goto ours;
351: }
1.19 mycroft 352: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 353: in_nullhost(ip->ip_dst))
1.1 cgd 354: goto ours;
355:
356: /*
357: * Not for us; forward if possible and desirable.
358: */
359: if (ipforwarding == 0) {
360: ipstat.ips_cantforward++;
361: m_freem(m);
362: } else
363: ip_forward(m, 0);
364: goto next;
365:
366: ours:
367: /*
368: * If offset or IP_MF are set, must reassemble.
369: * Otherwise, nothing need be done.
370: * (We could look in the reassembly queue to see
371: * if the packet was previously fragmented,
372: * but it's not worth the time; just let them time out.)
373: */
1.37 perry 374: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 375: if (m->m_flags & M_EXT) { /* XXX */
376: if ((m = m_pullup(m, sizeof (struct ip))) == 0) {
377: ipstat.ips_toosmall++;
378: goto next;
379: }
380: ip = mtod(m, struct ip *);
381: }
382: /*
383: * Look for queue of fragments
384: * of this datagram.
385: */
1.25 cgd 386: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 387: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 388: in_hosteq(ip->ip_src, fp->ipq_src) &&
389: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 390: ip->ip_p == fp->ipq_p)
391: goto found;
392: fp = 0;
393: found:
394:
395: /*
396: * Adjust ip_len to not reflect header,
1.25 cgd 397: * set ipqe_mff if more fragments are expected,
1.1 cgd 398: * convert offset of this to bytes.
399: */
400: ip->ip_len -= hlen;
1.25 cgd 401: mff = (ip->ip_off & IP_MF) != 0;
402: if (mff) {
1.16 cgd 403: /*
404: * Make sure that fragments have a data length
405: * that's a non-zero multiple of 8 bytes.
406: */
1.17 cgd 407: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 408: ipstat.ips_badfrags++;
409: goto bad;
410: }
411: }
1.1 cgd 412: ip->ip_off <<= 3;
413:
414: /*
415: * If datagram marked as having more fragments
416: * or if this is not the first fragment,
417: * attempt reassembly; if it succeeds, proceed.
418: */
1.25 cgd 419: if (mff || ip->ip_off) {
1.1 cgd 420: ipstat.ips_fragments++;
1.25 cgd 421: MALLOC(ipqe, struct ipqent *, sizeof (struct ipqent),
422: M_IPQ, M_NOWAIT);
423: if (ipqe == NULL) {
424: ipstat.ips_rcvmemdrop++;
425: goto bad;
426: }
427: ipqe->ipqe_mff = mff;
428: ipqe->ipqe_ip = ip;
429: ip = ip_reass(ipqe, fp);
1.1 cgd 430: if (ip == 0)
431: goto next;
1.13 mycroft 432: ipstat.ips_reassembled++;
1.1 cgd 433: m = dtom(ip);
434: } else
435: if (fp)
436: ip_freef(fp);
437: } else
438: ip->ip_len -= hlen;
439:
440: /*
441: * Switch out to protocol's input routine.
442: */
443: ipstat.ips_delivered++;
444: (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
445: goto next;
446: bad:
447: m_freem(m);
448: goto next;
449: }
450:
451: /*
452: * Take incoming datagram fragment and try to
453: * reassemble it into whole datagram. If a chain for
454: * reassembly of this datagram already exists, then it
455: * is given as fp; otherwise have to make a chain.
456: */
457: struct ip *
1.25 cgd 458: ip_reass(ipqe, fp)
459: register struct ipqent *ipqe;
1.1 cgd 460: register struct ipq *fp;
461: {
1.25 cgd 462: register struct mbuf *m = dtom(ipqe->ipqe_ip);
463: register struct ipqent *nq, *p, *q;
464: struct ip *ip;
1.1 cgd 465: struct mbuf *t;
1.25 cgd 466: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 467: int i, next;
468:
469: /*
470: * Presence of header sizes in mbufs
471: * would confuse code below.
472: */
473: m->m_data += hlen;
474: m->m_len -= hlen;
475:
476: /*
477: * If first fragment to arrive, create a reassembly queue.
478: */
479: if (fp == 0) {
480: if ((t = m_get(M_DONTWAIT, MT_FTABLE)) == NULL)
481: goto dropfrag;
482: fp = mtod(t, struct ipq *);
1.25 cgd 483: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 484: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 485: fp->ipq_p = ipqe->ipqe_ip->ip_p;
486: fp->ipq_id = ipqe->ipqe_ip->ip_id;
487: LIST_INIT(&fp->ipq_fragq);
488: fp->ipq_src = ipqe->ipqe_ip->ip_src;
489: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
490: p = NULL;
1.1 cgd 491: goto insert;
492: }
493:
494: /*
495: * Find a segment which begins after this one does.
496: */
1.25 cgd 497: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
498: p = q, q = q->ipqe_q.le_next)
499: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 500: break;
501:
502: /*
503: * If there is a preceding segment, it may provide some of
504: * our data already. If so, drop the data from the incoming
505: * segment. If it provides all of our data, drop us.
506: */
1.25 cgd 507: if (p != NULL) {
508: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
509: ipqe->ipqe_ip->ip_off;
1.1 cgd 510: if (i > 0) {
1.25 cgd 511: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 512: goto dropfrag;
1.25 cgd 513: m_adj(dtom(ipqe->ipqe_ip), i);
514: ipqe->ipqe_ip->ip_off += i;
515: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 516: }
517: }
518:
519: /*
520: * While we overlap succeeding segments trim them or,
521: * if they are completely covered, dequeue them.
522: */
1.25 cgd 523: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
524: q->ipqe_ip->ip_off; q = nq) {
525: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
526: q->ipqe_ip->ip_off;
527: if (i < q->ipqe_ip->ip_len) {
528: q->ipqe_ip->ip_len -= i;
529: q->ipqe_ip->ip_off += i;
530: m_adj(dtom(q->ipqe_ip), i);
1.1 cgd 531: break;
532: }
1.25 cgd 533: nq = q->ipqe_q.le_next;
534: m_freem(dtom(q->ipqe_ip));
535: LIST_REMOVE(q, ipqe_q);
536: FREE(q, M_IPQ);
1.1 cgd 537: }
538:
539: insert:
540: /*
541: * Stick new segment in its place;
542: * check for complete reassembly.
543: */
1.25 cgd 544: if (p == NULL) {
545: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
546: } else {
547: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
548: }
1.1 cgd 549: next = 0;
1.25 cgd 550: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
551: p = q, q = q->ipqe_q.le_next) {
552: if (q->ipqe_ip->ip_off != next)
1.1 cgd 553: return (0);
1.25 cgd 554: next += q->ipqe_ip->ip_len;
1.1 cgd 555: }
1.25 cgd 556: if (p->ipqe_mff)
1.1 cgd 557: return (0);
558:
559: /*
1.41 thorpej 560: * Reassembly is complete. Check for a bogus message size and
561: * concatenate fragments.
1.1 cgd 562: */
1.25 cgd 563: q = fp->ipq_fragq.lh_first;
564: ip = q->ipqe_ip;
1.41 thorpej 565: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
566: ipstat.ips_toolong++;
567: ip_freef(fp);
568: return (0);
569: }
1.25 cgd 570: m = dtom(q->ipqe_ip);
1.1 cgd 571: t = m->m_next;
572: m->m_next = 0;
573: m_cat(m, t);
1.25 cgd 574: nq = q->ipqe_q.le_next;
575: FREE(q, M_IPQ);
576: for (q = nq; q != NULL; q = nq) {
577: t = dtom(q->ipqe_ip);
578: nq = q->ipqe_q.le_next;
579: FREE(q, M_IPQ);
1.1 cgd 580: m_cat(m, t);
581: }
582:
583: /*
584: * Create header for new ip packet by
585: * modifying header of first packet;
586: * dequeue and discard fragment reassembly header.
587: * Make header visible.
588: */
589: ip->ip_len = next;
1.25 cgd 590: ip->ip_src = fp->ipq_src;
591: ip->ip_dst = fp->ipq_dst;
592: LIST_REMOVE(fp, ipq_q);
1.1 cgd 593: (void) m_free(dtom(fp));
594: m->m_len += (ip->ip_hl << 2);
595: m->m_data -= (ip->ip_hl << 2);
596: /* some debugging cruft by sklower, below, will go away soon */
597: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
598: register int plen = 0;
599: for (t = m; m; m = m->m_next)
600: plen += m->m_len;
601: t->m_pkthdr.len = plen;
602: }
1.25 cgd 603: return (ip);
1.1 cgd 604:
605: dropfrag:
606: ipstat.ips_fragdropped++;
607: m_freem(m);
1.25 cgd 608: FREE(ipqe, M_IPQ);
1.1 cgd 609: return (0);
610: }
611:
612: /*
613: * Free a fragment reassembly header and all
614: * associated datagrams.
615: */
1.8 mycroft 616: void
1.1 cgd 617: ip_freef(fp)
618: struct ipq *fp;
619: {
1.25 cgd 620: register struct ipqent *q, *p;
1.1 cgd 621:
1.25 cgd 622: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
623: p = q->ipqe_q.le_next;
624: m_freem(dtom(q->ipqe_ip));
625: LIST_REMOVE(q, ipqe_q);
626: FREE(q, M_IPQ);
1.1 cgd 627: }
1.25 cgd 628: LIST_REMOVE(fp, ipq_q);
1.1 cgd 629: (void) m_free(dtom(fp));
630: }
631:
632: /*
633: * IP timer processing;
634: * if a timer expires on a reassembly
635: * queue, discard it.
636: */
1.8 mycroft 637: void
1.1 cgd 638: ip_slowtimo()
639: {
1.25 cgd 640: register struct ipq *fp, *nfp;
1.24 mycroft 641: int s = splsoftnet();
1.1 cgd 642:
1.25 cgd 643: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
644: nfp = fp->ipq_q.le_next;
645: if (--fp->ipq_ttl == 0) {
1.1 cgd 646: ipstat.ips_fragtimeout++;
1.25 cgd 647: ip_freef(fp);
1.1 cgd 648: }
649: }
650: splx(s);
651: }
652:
653: /*
654: * Drain off all datagram fragments.
655: */
1.8 mycroft 656: void
1.1 cgd 657: ip_drain()
658: {
659:
1.25 cgd 660: while (ipq.lh_first != NULL) {
1.1 cgd 661: ipstat.ips_fragdropped++;
1.25 cgd 662: ip_freef(ipq.lh_first);
1.1 cgd 663: }
664: }
665:
666: /*
667: * Do option processing on a datagram,
668: * possibly discarding it if bad options are encountered,
669: * or forwarding it if source-routed.
670: * Returns 1 if packet has been forwarded/freed,
671: * 0 if the packet should be processed further.
672: */
1.8 mycroft 673: int
1.1 cgd 674: ip_dooptions(m)
675: struct mbuf *m;
676: {
677: register struct ip *ip = mtod(m, struct ip *);
678: register u_char *cp;
679: register struct ip_timestamp *ipt;
680: register struct in_ifaddr *ia;
681: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.13 mycroft 682: struct in_addr *sin, dst;
1.1 cgd 683: n_time ntime;
684:
1.13 mycroft 685: dst = ip->ip_dst;
1.1 cgd 686: cp = (u_char *)(ip + 1);
687: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
688: for (; cnt > 0; cnt -= optlen, cp += optlen) {
689: opt = cp[IPOPT_OPTVAL];
690: if (opt == IPOPT_EOL)
691: break;
692: if (opt == IPOPT_NOP)
693: optlen = 1;
694: else {
695: optlen = cp[IPOPT_OLEN];
696: if (optlen <= 0 || optlen > cnt) {
697: code = &cp[IPOPT_OLEN] - (u_char *)ip;
698: goto bad;
699: }
700: }
701: switch (opt) {
702:
703: default:
704: break;
705:
706: /*
707: * Source routing with record.
708: * Find interface with current destination address.
709: * If none on this machine then drop if strictly routed,
710: * or do nothing if loosely routed.
711: * Record interface address and bring up next address
712: * component. If strictly routed make sure next
713: * address is on directly accessible net.
714: */
715: case IPOPT_LSRR:
716: case IPOPT_SSRR:
717: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
718: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
719: goto bad;
720: }
721: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 722: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 723: if (ia == 0) {
724: if (opt == IPOPT_SSRR) {
725: type = ICMP_UNREACH;
726: code = ICMP_UNREACH_SRCFAIL;
727: goto bad;
728: }
729: /*
730: * Loose routing, and not at next destination
731: * yet; nothing to do except forward.
732: */
733: break;
734: }
735: off--; /* 0 origin */
736: if (off > optlen - sizeof(struct in_addr)) {
737: /*
738: * End of source route. Should be for us.
739: */
740: save_rte(cp, ip->ip_src);
741: break;
742: }
743: /*
744: * locate outgoing interface
745: */
746: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
747: sizeof(ipaddr.sin_addr));
748: if (opt == IPOPT_SSRR) {
749: #define INA struct in_ifaddr *
750: #define SA struct sockaddr *
1.29 mrg 751: ia = (INA)ifa_ifwithladdr((SA)&ipaddr);
1.1 cgd 752: } else
753: ia = ip_rtaddr(ipaddr.sin_addr);
754: if (ia == 0) {
755: type = ICMP_UNREACH;
756: code = ICMP_UNREACH_SRCFAIL;
757: goto bad;
758: }
759: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 760: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 761: (caddr_t)(cp + off), sizeof(struct in_addr));
762: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 763: /*
764: * Let ip_intr's mcast routing check handle mcast pkts
765: */
1.18 mycroft 766: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 767: break;
768:
769: case IPOPT_RR:
770: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
771: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
772: goto bad;
773: }
774: /*
775: * If no space remains, ignore.
776: */
777: off--; /* 0 origin */
778: if (off > optlen - sizeof(struct in_addr))
779: break;
780: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
781: sizeof(ipaddr.sin_addr));
782: /*
783: * locate outgoing interface; if we're the destination,
784: * use the incoming interface (should be same).
785: */
786: if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
787: (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
788: type = ICMP_UNREACH;
789: code = ICMP_UNREACH_HOST;
790: goto bad;
791: }
1.20 mycroft 792: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 793: (caddr_t)(cp + off), sizeof(struct in_addr));
794: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
795: break;
796:
797: case IPOPT_TS:
798: code = cp - (u_char *)ip;
799: ipt = (struct ip_timestamp *)cp;
800: if (ipt->ipt_len < 5)
801: goto bad;
1.15 cgd 802: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1 cgd 803: if (++ipt->ipt_oflw == 0)
804: goto bad;
805: break;
806: }
807: sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
808: switch (ipt->ipt_flg) {
809:
810: case IPOPT_TS_TSONLY:
811: break;
812:
813: case IPOPT_TS_TSANDADDR:
814: if (ipt->ipt_ptr + sizeof(n_time) +
815: sizeof(struct in_addr) > ipt->ipt_len)
816: goto bad;
1.13 mycroft 817: ipaddr.sin_addr = dst;
818: ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
819: m->m_pkthdr.rcvif);
820: if (ia == 0)
821: continue;
1.20 mycroft 822: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 823: (caddr_t)sin, sizeof(struct in_addr));
824: ipt->ipt_ptr += sizeof(struct in_addr);
825: break;
826:
827: case IPOPT_TS_PRESPEC:
828: if (ipt->ipt_ptr + sizeof(n_time) +
829: sizeof(struct in_addr) > ipt->ipt_len)
830: goto bad;
831: bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
832: sizeof(struct in_addr));
833: if (ifa_ifwithaddr((SA)&ipaddr) == 0)
834: continue;
835: ipt->ipt_ptr += sizeof(struct in_addr);
836: break;
837:
838: default:
839: goto bad;
840: }
841: ntime = iptime();
842: bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
843: sizeof(n_time));
844: ipt->ipt_ptr += sizeof(n_time);
845: }
846: }
847: if (forward) {
1.26 thorpej 848: if (ip_forwsrcrt == 0) {
849: type = ICMP_UNREACH;
850: code = ICMP_UNREACH_SRCFAIL;
851: goto bad;
852: }
1.1 cgd 853: ip_forward(m, 1);
854: return (1);
1.13 mycroft 855: }
856: return (0);
1.1 cgd 857: bad:
1.13 mycroft 858: ip->ip_len -= ip->ip_hl << 2; /* XXX icmp_error adds in hdr length */
859: icmp_error(m, type, code, 0, 0);
860: ipstat.ips_badoptions++;
1.1 cgd 861: return (1);
862: }
863:
864: /*
865: * Given address of next destination (final or next hop),
866: * return internet address info of interface to be used to get there.
867: */
868: struct in_ifaddr *
869: ip_rtaddr(dst)
870: struct in_addr dst;
871: {
872: register struct sockaddr_in *sin;
873:
1.19 mycroft 874: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 875:
1.35 mycroft 876: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 877: if (ipforward_rt.ro_rt) {
878: RTFREE(ipforward_rt.ro_rt);
879: ipforward_rt.ro_rt = 0;
880: }
881: sin->sin_family = AF_INET;
882: sin->sin_len = sizeof(*sin);
883: sin->sin_addr = dst;
884:
885: rtalloc(&ipforward_rt);
886: }
887: if (ipforward_rt.ro_rt == 0)
888: return ((struct in_ifaddr *)0);
1.19 mycroft 889: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 890: }
891:
892: /*
893: * Save incoming source route for use in replies,
894: * to be picked up later by ip_srcroute if the receiver is interested.
895: */
1.13 mycroft 896: void
1.1 cgd 897: save_rte(option, dst)
898: u_char *option;
899: struct in_addr dst;
900: {
901: unsigned olen;
902:
903: olen = option[IPOPT_OLEN];
904: #ifdef DIAGNOSTIC
905: if (ipprintfs)
1.39 christos 906: printf("save_rte: olen %d\n", olen);
1.1 cgd 907: #endif
908: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
909: return;
910: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
911: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
912: ip_srcrt.dst = dst;
913: }
914:
915: /*
916: * Retrieve incoming source route for use in replies,
917: * in the same form used by setsockopt.
918: * The first hop is placed before the options, will be removed later.
919: */
920: struct mbuf *
921: ip_srcroute()
922: {
923: register struct in_addr *p, *q;
924: register struct mbuf *m;
925:
926: if (ip_nhops == 0)
927: return ((struct mbuf *)0);
928: m = m_get(M_DONTWAIT, MT_SOOPTS);
929: if (m == 0)
930: return ((struct mbuf *)0);
931:
1.13 mycroft 932: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 933:
934: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
935: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
936: OPTSIZ;
937: #ifdef DIAGNOSTIC
938: if (ipprintfs)
1.39 christos 939: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 940: #endif
941:
942: /*
943: * First save first hop for return route
944: */
945: p = &ip_srcrt.route[ip_nhops - 1];
946: *(mtod(m, struct in_addr *)) = *p--;
947: #ifdef DIAGNOSTIC
948: if (ipprintfs)
1.39 christos 949: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 950: #endif
951:
952: /*
953: * Copy option fields and padding (nop) to mbuf.
954: */
955: ip_srcrt.nop = IPOPT_NOP;
956: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
957: bcopy((caddr_t)&ip_srcrt.nop,
958: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
959: q = (struct in_addr *)(mtod(m, caddr_t) +
960: sizeof(struct in_addr) + OPTSIZ);
961: #undef OPTSIZ
962: /*
963: * Record return path as an IP source route,
964: * reversing the path (pointers are now aligned).
965: */
966: while (p >= ip_srcrt.route) {
967: #ifdef DIAGNOSTIC
968: if (ipprintfs)
1.39 christos 969: printf(" %x", ntohl(q->s_addr));
1.1 cgd 970: #endif
971: *q++ = *p--;
972: }
973: /*
974: * Last hop goes to final destination.
975: */
976: *q = ip_srcrt.dst;
977: #ifdef DIAGNOSTIC
978: if (ipprintfs)
1.39 christos 979: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 980: #endif
981: return (m);
982: }
983:
984: /*
985: * Strip out IP options, at higher
986: * level protocol in the kernel.
987: * Second argument is buffer to which options
988: * will be moved, and return value is their length.
989: * XXX should be deleted; last arg currently ignored.
990: */
1.8 mycroft 991: void
1.1 cgd 992: ip_stripoptions(m, mopt)
993: register struct mbuf *m;
994: struct mbuf *mopt;
995: {
996: register int i;
997: struct ip *ip = mtod(m, struct ip *);
998: register caddr_t opts;
999: int olen;
1000:
1001: olen = (ip->ip_hl<<2) - sizeof (struct ip);
1002: opts = (caddr_t)(ip + 1);
1003: i = m->m_len - (sizeof (struct ip) + olen);
1004: bcopy(opts + olen, opts, (unsigned)i);
1005: m->m_len -= olen;
1006: if (m->m_flags & M_PKTHDR)
1007: m->m_pkthdr.len -= olen;
1008: ip->ip_hl = sizeof(struct ip) >> 2;
1009: }
1010:
1.23 mycroft 1011: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1012: 0, 0, 0, 0,
1013: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1014: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1015: EMSGSIZE, EHOSTUNREACH, 0, 0,
1016: 0, 0, 0, 0,
1017: ENOPROTOOPT
1018: };
1019:
1020: /*
1021: * Forward a packet. If some error occurs return the sender
1022: * an icmp packet. Note we can't always generate a meaningful
1023: * icmp message because icmp doesn't have a large enough repertoire
1024: * of codes and types.
1025: *
1026: * If not forwarding, just drop the packet. This could be confusing
1027: * if ipforwarding was zero but some routing protocol was advancing
1028: * us as a gateway to somewhere. However, we must let the routing
1029: * protocol deal with that.
1030: *
1031: * The srcrt parameter indicates whether the packet is being forwarded
1032: * via a source route.
1033: */
1.13 mycroft 1034: void
1.1 cgd 1035: ip_forward(m, srcrt)
1036: struct mbuf *m;
1037: int srcrt;
1038: {
1039: register struct ip *ip = mtod(m, struct ip *);
1040: register struct sockaddr_in *sin;
1041: register struct rtentry *rt;
1.28 christos 1042: int error, type = 0, code = 0;
1.1 cgd 1043: struct mbuf *mcopy;
1.13 mycroft 1044: n_long dest;
1045: struct ifnet *destifp;
1.1 cgd 1046:
1.13 mycroft 1047: dest = 0;
1.1 cgd 1048: #ifdef DIAGNOSTIC
1049: if (ipprintfs)
1.39 christos 1050: printf("forward: src %x dst %x ttl %x\n",
1.35 mycroft 1051: ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl);
1.1 cgd 1052: #endif
1053: if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) {
1054: ipstat.ips_cantforward++;
1055: m_freem(m);
1056: return;
1057: }
1058: HTONS(ip->ip_id);
1059: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1060: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1061: return;
1062: }
1063: ip->ip_ttl -= IPTTLDEC;
1064:
1.19 mycroft 1065: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1066: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1067: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1068: if (ipforward_rt.ro_rt) {
1069: RTFREE(ipforward_rt.ro_rt);
1070: ipforward_rt.ro_rt = 0;
1071: }
1072: sin->sin_family = AF_INET;
1.35 mycroft 1073: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1074: sin->sin_addr = ip->ip_dst;
1075:
1076: rtalloc(&ipforward_rt);
1077: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1078: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1079: return;
1080: }
1081: rt = ipforward_rt.ro_rt;
1082: }
1083:
1084: /*
1.34 mycroft 1085: * Save at most 68 bytes of the packet in case
1.1 cgd 1086: * we need to generate an ICMP message to the src.
1087: */
1.34 mycroft 1088: mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1 cgd 1089:
1090: /*
1091: * If forwarding packet using same interface that it came in on,
1092: * perhaps should send a redirect to sender to shortcut a hop.
1093: * Only send redirect if source is sending directly to us,
1094: * and if packet was not source routed (or has any options).
1095: * Also, don't send redirect if forwarding using a default route
1096: * or a route modified by a redirect.
1097: */
1098: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1099: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1100: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1101: ipsendredirects && !srcrt) {
1.19 mycroft 1102: if (rt->rt_ifa &&
1103: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1104: ifatoia(rt->rt_ifa)->ia_subnet) {
1.1 cgd 1105: if (rt->rt_flags & RTF_GATEWAY)
1.13 mycroft 1106: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1.1 cgd 1107: else
1.13 mycroft 1108: dest = ip->ip_dst.s_addr;
1109: /* Router requirements says to only send host redirects */
1.1 cgd 1110: type = ICMP_REDIRECT;
1.13 mycroft 1111: code = ICMP_REDIRECT_HOST;
1.1 cgd 1112: #ifdef DIAGNOSTIC
1113: if (ipprintfs)
1.39 christos 1114: printf("redirect (%d) to %x\n", code, (u_int32_t)dest);
1.1 cgd 1115: #endif
1116: }
1117: }
1118:
1.27 thorpej 1119: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1120: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1121: if (error)
1122: ipstat.ips_cantforward++;
1123: else {
1124: ipstat.ips_forward++;
1125: if (type)
1126: ipstat.ips_redirectsent++;
1127: else {
1128: if (mcopy)
1129: m_freem(mcopy);
1130: return;
1131: }
1132: }
1133: if (mcopy == NULL)
1134: return;
1.13 mycroft 1135: destifp = NULL;
1136:
1.1 cgd 1137: switch (error) {
1138:
1139: case 0: /* forwarded, but need redirect */
1140: /* type, code set above */
1141: break;
1142:
1143: case ENETUNREACH: /* shouldn't happen, checked above */
1144: case EHOSTUNREACH:
1145: case ENETDOWN:
1146: case EHOSTDOWN:
1147: default:
1148: type = ICMP_UNREACH;
1149: code = ICMP_UNREACH_HOST;
1150: break;
1151:
1152: case EMSGSIZE:
1153: type = ICMP_UNREACH;
1154: code = ICMP_UNREACH_NEEDFRAG;
1.13 mycroft 1155: if (ipforward_rt.ro_rt)
1156: destifp = ipforward_rt.ro_rt->rt_ifp;
1.1 cgd 1157: ipstat.ips_cantfrag++;
1158: break;
1159:
1160: case ENOBUFS:
1161: type = ICMP_SOURCEQUENCH;
1162: code = 0;
1163: break;
1164: }
1.13 mycroft 1165: icmp_error(mcopy, type, code, dest, destifp);
1.44 ! thorpej 1166: }
! 1167:
! 1168: void
! 1169: ip_savecontrol(inp, mp, ip, m)
! 1170: register struct inpcb *inp;
! 1171: register struct mbuf **mp;
! 1172: register struct ip *ip;
! 1173: register struct mbuf *m;
! 1174: {
! 1175:
! 1176: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
! 1177: struct timeval tv;
! 1178:
! 1179: microtime(&tv);
! 1180: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
! 1181: SCM_TIMESTAMP, SOL_SOCKET);
! 1182: if (*mp)
! 1183: mp = &(*mp)->m_next;
! 1184: }
! 1185: if (inp->inp_flags & INP_RECVDSTADDR) {
! 1186: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
! 1187: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
! 1188: if (*mp)
! 1189: mp = &(*mp)->m_next;
! 1190: }
! 1191: #ifdef notyet
! 1192: /*
! 1193: * XXX
! 1194: * Moving these out of udp_input() made them even more broken
! 1195: * than they already were.
! 1196: * - fenner@parc.xerox.com
! 1197: */
! 1198: /* options were tossed already */
! 1199: if (inp->inp_flags & INP_RECVOPTS) {
! 1200: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
! 1201: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
! 1202: if (*mp)
! 1203: mp = &(*mp)->m_next;
! 1204: }
! 1205: /* ip_srcroute doesn't do what we want here, need to fix */
! 1206: if (inp->inp_flags & INP_RECVRETOPTS) {
! 1207: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
! 1208: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
! 1209: if (*mp)
! 1210: mp = &(*mp)->m_next;
! 1211: }
! 1212: #endif
! 1213: if (inp->inp_flags & INP_RECVIF) {
! 1214: struct sockaddr_dl sdl;
! 1215:
! 1216: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
! 1217: sdl.sdl_family = AF_LINK;
! 1218: sdl.sdl_index = m->m_pkthdr.rcvif ?
! 1219: m->m_pkthdr.rcvif->if_index : 0;
! 1220: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
! 1221: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
! 1222: IP_RECVIF, IPPROTO_IP);
! 1223: if (*mp)
! 1224: mp = &(*mp)->m_next;
! 1225: }
1.13 mycroft 1226: }
1227:
1228: int
1229: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1230: int *name;
1231: u_int namelen;
1232: void *oldp;
1233: size_t *oldlenp;
1234: void *newp;
1235: size_t newlen;
1236: {
1237: /* All sysctl names at this level are terminal. */
1238: if (namelen != 1)
1239: return (ENOTDIR);
1240:
1241: switch (name[0]) {
1242: case IPCTL_FORWARDING:
1243: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1244: case IPCTL_SENDREDIRECTS:
1245: return (sysctl_int(oldp, oldlenp, newp, newlen,
1246: &ipsendredirects));
1247: case IPCTL_DEFTTL:
1248: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1249: #ifdef notyet
1250: case IPCTL_DEFMTU:
1251: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1252: #endif
1.26 thorpej 1253: case IPCTL_FORWSRCRT:
1254: /*
1255: * Don't allow this to change in a secure environment.
1256: */
1257: if (securelevel > 0)
1258: return (EPERM);
1259: return (sysctl_int(oldp, oldlenp, newp, newlen,
1260: &ip_forwsrcrt));
1.27 thorpej 1261: case IPCTL_DIRECTEDBCAST:
1262: return (sysctl_int(oldp, oldlenp, newp, newlen,
1263: &ip_directedbcast));
1.13 mycroft 1264: default:
1265: return (EOPNOTSUPP);
1266: }
1267: /* NOTREACHED */
1.1 cgd 1268: }
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