Annotation of src/sys/netinet/ip_input.c, Revision 1.46
1.46 ! cjs 1: /* $NetBSD: ip_input.c,v 1.45 1997/02/18 20:49:35 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>
1.45 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
81: #define IPFORWSRCRT 1 /* allow source-routed packets */
82: #endif
1.27 thorpej 83: /*
84: * Note: DIRECTED_BROADCAST is handled this way so that previous
85: * configuration using this option will Just Work.
86: */
87: #ifndef IPDIRECTEDBCAST
88: #ifdef DIRECTED_BROADCAST
89: #define IPDIRECTEDBCAST 1
90: #else
91: #define IPDIRECTEDBCAST 0
92: #endif /* DIRECTED_BROADCAST */
93: #endif /* IPDIRECTEDBCAST */
1.1 cgd 94: int ipforwarding = IPFORWARDING;
95: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 96: int ip_defttl = IPDEFTTL;
1.26 thorpej 97: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 98: int ip_directedbcast = IPDIRECTEDBCAST;
1.1 cgd 99: #ifdef DIAGNOSTIC
100: int ipprintfs = 0;
101: #endif
102:
103: extern struct domain inetdomain;
104: extern struct protosw inetsw[];
105: u_char ip_protox[IPPROTO_MAX];
106: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 107: struct in_ifaddrhead in_ifaddr;
1.13 mycroft 108: struct ifqueue ipintrq;
1.1 cgd 109:
110: /*
111: * We need to save the IP options in case a protocol wants to respond
112: * to an incoming packet over the same route if the packet got here
113: * using IP source routing. This allows connection establishment and
114: * maintenance when the remote end is on a network that is not known
115: * to us.
116: */
117: int ip_nhops = 0;
118: static struct ip_srcrt {
119: struct in_addr dst; /* final destination */
120: char nop; /* one NOP to align */
121: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
122: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
123: } ip_srcrt;
124:
1.13 mycroft 125: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 126:
1.1 cgd 127: /*
128: * IP initialization: fill in IP protocol switch table.
129: * All protocols not implemented in kernel go to raw IP protocol handler.
130: */
1.8 mycroft 131: void
1.1 cgd 132: ip_init()
133: {
134: register struct protosw *pr;
135: register int i;
136:
137: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
138: if (pr == 0)
139: panic("ip_init");
140: for (i = 0; i < IPPROTO_MAX; i++)
141: ip_protox[i] = pr - inetsw;
142: for (pr = inetdomain.dom_protosw;
143: pr < inetdomain.dom_protoswNPROTOSW; pr++)
144: if (pr->pr_domain->dom_family == PF_INET &&
145: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
146: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 147: LIST_INIT(&ipq);
1.1 cgd 148: ip_id = time.tv_sec & 0xffff;
149: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 150: TAILQ_INIT(&in_ifaddr);
1.1 cgd 151: }
152:
153: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
154: struct route ipforward_rt;
155:
156: /*
157: * Ip input routine. Checksum and byte swap header. If fragmented
158: * try to reassemble. Process options. Pass to next level.
159: */
1.8 mycroft 160: void
1.1 cgd 161: ipintr()
162: {
1.33 mrg 163: register struct ip *ip = NULL;
1.1 cgd 164: register struct mbuf *m;
165: register struct ipq *fp;
166: register struct in_ifaddr *ia;
1.25 cgd 167: struct ipqent *ipqe;
1.35 mycroft 168: int hlen = 0, mff, len, s;
1.36 mrg 169: #ifdef PFIL_HOOKS
1.33 mrg 170: struct packet_filter_hook *pfh;
171: struct mbuf *m0;
1.43 mrg 172: int rv;
1.36 mrg 173: #endif /* PFIL_HOOKS */
1.1 cgd 174:
175: next:
176: /*
177: * Get next datagram off input queue and get IP header
178: * in first mbuf.
179: */
180: s = splimp();
181: IF_DEQUEUE(&ipintrq, m);
182: splx(s);
1.13 mycroft 183: if (m == 0)
1.1 cgd 184: return;
185: #ifdef DIAGNOSTIC
186: if ((m->m_flags & M_PKTHDR) == 0)
187: panic("ipintr no HDR");
188: #endif
189: /*
190: * If no IP addresses have been set yet but the interfaces
191: * are receiving, can't do anything with incoming packets yet.
192: */
1.22 mycroft 193: if (in_ifaddr.tqh_first == 0)
1.1 cgd 194: goto bad;
195: ipstat.ips_total++;
196: if (m->m_len < sizeof (struct ip) &&
197: (m = m_pullup(m, sizeof (struct ip))) == 0) {
198: ipstat.ips_toosmall++;
199: goto next;
200: }
201: ip = mtod(m, struct ip *);
1.13 mycroft 202: if (ip->ip_v != IPVERSION) {
203: ipstat.ips_badvers++;
204: goto bad;
205: }
1.1 cgd 206: hlen = ip->ip_hl << 2;
207: if (hlen < sizeof(struct ip)) { /* minimum header length */
208: ipstat.ips_badhlen++;
209: goto bad;
210: }
211: if (hlen > m->m_len) {
212: if ((m = m_pullup(m, hlen)) == 0) {
213: ipstat.ips_badhlen++;
214: goto next;
215: }
216: ip = mtod(m, struct ip *);
217: }
1.28 christos 218: if ((ip->ip_sum = in_cksum(m, hlen)) != 0) {
1.1 cgd 219: ipstat.ips_badsum++;
220: goto bad;
221: }
222:
223: /*
224: * Convert fields to host representation.
225: */
226: NTOHS(ip->ip_len);
227: NTOHS(ip->ip_id);
228: NTOHS(ip->ip_off);
1.35 mycroft 229: len = ip->ip_len;
1.1 cgd 230:
231: /*
232: * Check that the amount of data in the buffers
233: * is as at least much as the IP header would have us expect.
234: * Trim mbufs if longer than we expect.
235: * Drop packet if shorter than we expect.
236: */
1.35 mycroft 237: if (m->m_pkthdr.len < len) {
1.1 cgd 238: ipstat.ips_tooshort++;
239: goto bad;
240: }
1.35 mycroft 241: if (m->m_pkthdr.len > len) {
1.1 cgd 242: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 243: m->m_len = len;
244: m->m_pkthdr.len = len;
1.1 cgd 245: } else
1.35 mycroft 246: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 247: }
248:
1.36 mrg 249: #ifdef PFIL_HOOKS
1.33 mrg 250: /*
251: * Run through list of hooks for input packets.
252: */
253: m0 = m;
254: for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.le_next)
255: if (pfh->pfil_func) {
1.43 mrg 256: rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0);
257: ip = mtod(m = m0, struct ip *);
258: if (rv)
1.40 veego 259: goto next;
1.33 mrg 260: }
1.36 mrg 261: #endif /* PFIL_HOOKS */
1.33 mrg 262:
1.1 cgd 263: /*
264: * Process options and, if not destined for us,
265: * ship it on. ip_dooptions returns 1 when an
266: * error was detected (causing an icmp message
267: * to be sent and the original packet to be freed).
268: */
269: ip_nhops = 0; /* for source routed packets */
270: if (hlen > sizeof (struct ip) && ip_dooptions(m))
271: goto next;
272:
273: /*
274: * Check our list of addresses, to see if the packet is for us.
275: */
1.22 mycroft 276: for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) {
1.35 mycroft 277: if (in_hosteq(ip->ip_dst, ia->ia_addr.sin_addr))
1.1 cgd 278: goto ours;
1.27 thorpej 279: if (((ip_directedbcast == 0) || (ip_directedbcast &&
280: ia->ia_ifp == m->m_pkthdr.rcvif)) &&
1.1 cgd 281: (ia->ia_ifp->if_flags & IFF_BROADCAST)) {
1.35 mycroft 282: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
283: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 284: /*
285: * Look for all-0's host part (old broadcast addr),
286: * either for subnet or net.
287: */
288: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 289: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 290: goto ours;
291: }
292: }
1.18 mycroft 293: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 294: struct in_multi *inm;
295: #ifdef MROUTING
296: extern struct socket *ip_mrouter;
1.10 brezak 297:
298: if (m->m_flags & M_EXT) {
299: if ((m = m_pullup(m, hlen)) == 0) {
300: ipstat.ips_toosmall++;
301: goto next;
302: }
303: ip = mtod(m, struct ip *);
304: }
1.4 hpeyerl 305:
306: if (ip_mrouter) {
307: /*
308: * If we are acting as a multicast router, all
309: * incoming multicast packets are passed to the
310: * kernel-level multicast forwarding function.
311: * The packet is returned (relatively) intact; if
312: * ip_mforward() returns a non-zero value, the packet
313: * must be discarded, else it may be accepted below.
314: *
315: * (The IP ident field is put in the same byte order
316: * as expected when ip_mforward() is called from
317: * ip_output().)
318: */
319: ip->ip_id = htons(ip->ip_id);
1.13 mycroft 320: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
321: ipstat.ips_cantforward++;
1.4 hpeyerl 322: m_freem(m);
323: goto next;
324: }
325: ip->ip_id = ntohs(ip->ip_id);
326:
327: /*
328: * The process-level routing demon needs to receive
329: * all multicast IGMP packets, whether or not this
330: * host belongs to their destination groups.
331: */
332: if (ip->ip_p == IPPROTO_IGMP)
333: goto ours;
1.13 mycroft 334: ipstat.ips_forward++;
1.4 hpeyerl 335: }
336: #endif
337: /*
338: * See if we belong to the destination multicast group on the
339: * arrival interface.
340: */
341: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
342: if (inm == NULL) {
1.13 mycroft 343: ipstat.ips_cantforward++;
1.4 hpeyerl 344: m_freem(m);
345: goto next;
346: }
347: goto ours;
348: }
1.19 mycroft 349: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 350: in_nullhost(ip->ip_dst))
1.1 cgd 351: goto ours;
352:
353: /*
354: * Not for us; forward if possible and desirable.
355: */
356: if (ipforwarding == 0) {
357: ipstat.ips_cantforward++;
358: m_freem(m);
359: } else
360: ip_forward(m, 0);
361: goto next;
362:
363: ours:
364: /*
365: * If offset or IP_MF are set, must reassemble.
366: * Otherwise, nothing need be done.
367: * (We could look in the reassembly queue to see
368: * if the packet was previously fragmented,
369: * but it's not worth the time; just let them time out.)
370: */
1.37 perry 371: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 372: if (m->m_flags & M_EXT) { /* XXX */
373: if ((m = m_pullup(m, sizeof (struct ip))) == 0) {
374: ipstat.ips_toosmall++;
375: goto next;
376: }
377: ip = mtod(m, struct ip *);
378: }
379: /*
380: * Look for queue of fragments
381: * of this datagram.
382: */
1.25 cgd 383: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 384: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 385: in_hosteq(ip->ip_src, fp->ipq_src) &&
386: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 387: ip->ip_p == fp->ipq_p)
388: goto found;
389: fp = 0;
390: found:
391:
392: /*
393: * Adjust ip_len to not reflect header,
1.25 cgd 394: * set ipqe_mff if more fragments are expected,
1.1 cgd 395: * convert offset of this to bytes.
396: */
397: ip->ip_len -= hlen;
1.25 cgd 398: mff = (ip->ip_off & IP_MF) != 0;
399: if (mff) {
1.16 cgd 400: /*
401: * Make sure that fragments have a data length
402: * that's a non-zero multiple of 8 bytes.
403: */
1.17 cgd 404: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 405: ipstat.ips_badfrags++;
406: goto bad;
407: }
408: }
1.1 cgd 409: ip->ip_off <<= 3;
410:
411: /*
412: * If datagram marked as having more fragments
413: * or if this is not the first fragment,
414: * attempt reassembly; if it succeeds, proceed.
415: */
1.25 cgd 416: if (mff || ip->ip_off) {
1.1 cgd 417: ipstat.ips_fragments++;
1.25 cgd 418: MALLOC(ipqe, struct ipqent *, sizeof (struct ipqent),
419: M_IPQ, M_NOWAIT);
420: if (ipqe == NULL) {
421: ipstat.ips_rcvmemdrop++;
422: goto bad;
423: }
424: ipqe->ipqe_mff = mff;
425: ipqe->ipqe_ip = ip;
426: ip = ip_reass(ipqe, fp);
1.1 cgd 427: if (ip == 0)
428: goto next;
1.13 mycroft 429: ipstat.ips_reassembled++;
1.1 cgd 430: m = dtom(ip);
431: } else
432: if (fp)
433: ip_freef(fp);
434: } else
435: ip->ip_len -= hlen;
436:
437: /*
438: * Switch out to protocol's input routine.
439: */
440: ipstat.ips_delivered++;
441: (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
442: goto next;
443: bad:
444: m_freem(m);
445: goto next;
446: }
447:
448: /*
449: * Take incoming datagram fragment and try to
450: * reassemble it into whole datagram. If a chain for
451: * reassembly of this datagram already exists, then it
452: * is given as fp; otherwise have to make a chain.
453: */
454: struct ip *
1.25 cgd 455: ip_reass(ipqe, fp)
456: register struct ipqent *ipqe;
1.1 cgd 457: register struct ipq *fp;
458: {
1.25 cgd 459: register struct mbuf *m = dtom(ipqe->ipqe_ip);
460: register struct ipqent *nq, *p, *q;
461: struct ip *ip;
1.1 cgd 462: struct mbuf *t;
1.25 cgd 463: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 464: int i, next;
465:
466: /*
467: * Presence of header sizes in mbufs
468: * would confuse code below.
469: */
470: m->m_data += hlen;
471: m->m_len -= hlen;
472:
473: /*
474: * If first fragment to arrive, create a reassembly queue.
475: */
476: if (fp == 0) {
477: if ((t = m_get(M_DONTWAIT, MT_FTABLE)) == NULL)
478: goto dropfrag;
479: fp = mtod(t, struct ipq *);
1.25 cgd 480: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 481: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 482: fp->ipq_p = ipqe->ipqe_ip->ip_p;
483: fp->ipq_id = ipqe->ipqe_ip->ip_id;
484: LIST_INIT(&fp->ipq_fragq);
485: fp->ipq_src = ipqe->ipqe_ip->ip_src;
486: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
487: p = NULL;
1.1 cgd 488: goto insert;
489: }
490:
491: /*
492: * Find a segment which begins after this one does.
493: */
1.25 cgd 494: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
495: p = q, q = q->ipqe_q.le_next)
496: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 497: break;
498:
499: /*
500: * If there is a preceding segment, it may provide some of
501: * our data already. If so, drop the data from the incoming
502: * segment. If it provides all of our data, drop us.
503: */
1.25 cgd 504: if (p != NULL) {
505: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
506: ipqe->ipqe_ip->ip_off;
1.1 cgd 507: if (i > 0) {
1.25 cgd 508: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 509: goto dropfrag;
1.25 cgd 510: m_adj(dtom(ipqe->ipqe_ip), i);
511: ipqe->ipqe_ip->ip_off += i;
512: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 513: }
514: }
515:
516: /*
517: * While we overlap succeeding segments trim them or,
518: * if they are completely covered, dequeue them.
519: */
1.25 cgd 520: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
521: q->ipqe_ip->ip_off; q = nq) {
522: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
523: q->ipqe_ip->ip_off;
524: if (i < q->ipqe_ip->ip_len) {
525: q->ipqe_ip->ip_len -= i;
526: q->ipqe_ip->ip_off += i;
527: m_adj(dtom(q->ipqe_ip), i);
1.1 cgd 528: break;
529: }
1.25 cgd 530: nq = q->ipqe_q.le_next;
531: m_freem(dtom(q->ipqe_ip));
532: LIST_REMOVE(q, ipqe_q);
533: FREE(q, M_IPQ);
1.1 cgd 534: }
535:
536: insert:
537: /*
538: * Stick new segment in its place;
539: * check for complete reassembly.
540: */
1.25 cgd 541: if (p == NULL) {
542: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
543: } else {
544: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
545: }
1.1 cgd 546: next = 0;
1.25 cgd 547: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
548: p = q, q = q->ipqe_q.le_next) {
549: if (q->ipqe_ip->ip_off != next)
1.1 cgd 550: return (0);
1.25 cgd 551: next += q->ipqe_ip->ip_len;
1.1 cgd 552: }
1.25 cgd 553: if (p->ipqe_mff)
1.1 cgd 554: return (0);
555:
556: /*
1.41 thorpej 557: * Reassembly is complete. Check for a bogus message size and
558: * concatenate fragments.
1.1 cgd 559: */
1.25 cgd 560: q = fp->ipq_fragq.lh_first;
561: ip = q->ipqe_ip;
1.41 thorpej 562: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
563: ipstat.ips_toolong++;
564: ip_freef(fp);
565: return (0);
566: }
1.25 cgd 567: m = dtom(q->ipqe_ip);
1.1 cgd 568: t = m->m_next;
569: m->m_next = 0;
570: m_cat(m, t);
1.25 cgd 571: nq = q->ipqe_q.le_next;
572: FREE(q, M_IPQ);
573: for (q = nq; q != NULL; q = nq) {
574: t = dtom(q->ipqe_ip);
575: nq = q->ipqe_q.le_next;
576: FREE(q, M_IPQ);
1.1 cgd 577: m_cat(m, t);
578: }
579:
580: /*
581: * Create header for new ip packet by
582: * modifying header of first packet;
583: * dequeue and discard fragment reassembly header.
584: * Make header visible.
585: */
586: ip->ip_len = next;
1.25 cgd 587: ip->ip_src = fp->ipq_src;
588: ip->ip_dst = fp->ipq_dst;
589: LIST_REMOVE(fp, ipq_q);
1.1 cgd 590: (void) m_free(dtom(fp));
591: m->m_len += (ip->ip_hl << 2);
592: m->m_data -= (ip->ip_hl << 2);
593: /* some debugging cruft by sklower, below, will go away soon */
594: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
595: register int plen = 0;
596: for (t = m; m; m = m->m_next)
597: plen += m->m_len;
598: t->m_pkthdr.len = plen;
599: }
1.25 cgd 600: return (ip);
1.1 cgd 601:
602: dropfrag:
603: ipstat.ips_fragdropped++;
604: m_freem(m);
1.25 cgd 605: FREE(ipqe, M_IPQ);
1.1 cgd 606: return (0);
607: }
608:
609: /*
610: * Free a fragment reassembly header and all
611: * associated datagrams.
612: */
1.8 mycroft 613: void
1.1 cgd 614: ip_freef(fp)
615: struct ipq *fp;
616: {
1.25 cgd 617: register struct ipqent *q, *p;
1.1 cgd 618:
1.25 cgd 619: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
620: p = q->ipqe_q.le_next;
621: m_freem(dtom(q->ipqe_ip));
622: LIST_REMOVE(q, ipqe_q);
623: FREE(q, M_IPQ);
1.1 cgd 624: }
1.25 cgd 625: LIST_REMOVE(fp, ipq_q);
1.1 cgd 626: (void) m_free(dtom(fp));
627: }
628:
629: /*
630: * IP timer processing;
631: * if a timer expires on a reassembly
632: * queue, discard it.
633: */
1.8 mycroft 634: void
1.1 cgd 635: ip_slowtimo()
636: {
1.25 cgd 637: register struct ipq *fp, *nfp;
1.24 mycroft 638: int s = splsoftnet();
1.1 cgd 639:
1.25 cgd 640: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
641: nfp = fp->ipq_q.le_next;
642: if (--fp->ipq_ttl == 0) {
1.1 cgd 643: ipstat.ips_fragtimeout++;
1.25 cgd 644: ip_freef(fp);
1.1 cgd 645: }
646: }
647: splx(s);
648: }
649:
650: /*
651: * Drain off all datagram fragments.
652: */
1.8 mycroft 653: void
1.1 cgd 654: ip_drain()
655: {
656:
1.25 cgd 657: while (ipq.lh_first != NULL) {
1.1 cgd 658: ipstat.ips_fragdropped++;
1.25 cgd 659: ip_freef(ipq.lh_first);
1.1 cgd 660: }
661: }
662:
663: /*
664: * Do option processing on a datagram,
665: * possibly discarding it if bad options are encountered,
666: * or forwarding it if source-routed.
667: * Returns 1 if packet has been forwarded/freed,
668: * 0 if the packet should be processed further.
669: */
1.8 mycroft 670: int
1.1 cgd 671: ip_dooptions(m)
672: struct mbuf *m;
673: {
674: register struct ip *ip = mtod(m, struct ip *);
675: register u_char *cp;
676: register struct ip_timestamp *ipt;
677: register struct in_ifaddr *ia;
678: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.13 mycroft 679: struct in_addr *sin, dst;
1.1 cgd 680: n_time ntime;
681:
1.13 mycroft 682: dst = ip->ip_dst;
1.1 cgd 683: cp = (u_char *)(ip + 1);
684: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
685: for (; cnt > 0; cnt -= optlen, cp += optlen) {
686: opt = cp[IPOPT_OPTVAL];
687: if (opt == IPOPT_EOL)
688: break;
689: if (opt == IPOPT_NOP)
690: optlen = 1;
691: else {
692: optlen = cp[IPOPT_OLEN];
693: if (optlen <= 0 || optlen > cnt) {
694: code = &cp[IPOPT_OLEN] - (u_char *)ip;
695: goto bad;
696: }
697: }
698: switch (opt) {
699:
700: default:
701: break;
702:
703: /*
704: * Source routing with record.
705: * Find interface with current destination address.
706: * If none on this machine then drop if strictly routed,
707: * or do nothing if loosely routed.
708: * Record interface address and bring up next address
709: * component. If strictly routed make sure next
710: * address is on directly accessible net.
711: */
712: case IPOPT_LSRR:
713: case IPOPT_SSRR:
714: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
715: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
716: goto bad;
717: }
718: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 719: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 720: if (ia == 0) {
721: if (opt == IPOPT_SSRR) {
722: type = ICMP_UNREACH;
723: code = ICMP_UNREACH_SRCFAIL;
724: goto bad;
725: }
726: /*
727: * Loose routing, and not at next destination
728: * yet; nothing to do except forward.
729: */
730: break;
731: }
732: off--; /* 0 origin */
733: if (off > optlen - sizeof(struct in_addr)) {
734: /*
735: * End of source route. Should be for us.
736: */
737: save_rte(cp, ip->ip_src);
738: break;
739: }
740: /*
741: * locate outgoing interface
742: */
743: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
744: sizeof(ipaddr.sin_addr));
745: if (opt == IPOPT_SSRR) {
746: #define INA struct in_ifaddr *
747: #define SA struct sockaddr *
1.29 mrg 748: ia = (INA)ifa_ifwithladdr((SA)&ipaddr);
1.1 cgd 749: } else
750: ia = ip_rtaddr(ipaddr.sin_addr);
751: if (ia == 0) {
752: type = ICMP_UNREACH;
753: code = ICMP_UNREACH_SRCFAIL;
754: goto bad;
755: }
756: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 757: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 758: (caddr_t)(cp + off), sizeof(struct in_addr));
759: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 760: /*
761: * Let ip_intr's mcast routing check handle mcast pkts
762: */
1.18 mycroft 763: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 764: break;
765:
766: case IPOPT_RR:
767: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
768: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
769: goto bad;
770: }
771: /*
772: * If no space remains, ignore.
773: */
774: off--; /* 0 origin */
775: if (off > optlen - sizeof(struct in_addr))
776: break;
777: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
778: sizeof(ipaddr.sin_addr));
779: /*
780: * locate outgoing interface; if we're the destination,
781: * use the incoming interface (should be same).
782: */
783: if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
784: (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
785: type = ICMP_UNREACH;
786: code = ICMP_UNREACH_HOST;
787: goto bad;
788: }
1.20 mycroft 789: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 790: (caddr_t)(cp + off), sizeof(struct in_addr));
791: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
792: break;
793:
794: case IPOPT_TS:
795: code = cp - (u_char *)ip;
796: ipt = (struct ip_timestamp *)cp;
797: if (ipt->ipt_len < 5)
798: goto bad;
1.15 cgd 799: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1 cgd 800: if (++ipt->ipt_oflw == 0)
801: goto bad;
802: break;
803: }
804: sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
805: switch (ipt->ipt_flg) {
806:
807: case IPOPT_TS_TSONLY:
808: break;
809:
810: case IPOPT_TS_TSANDADDR:
811: if (ipt->ipt_ptr + sizeof(n_time) +
812: sizeof(struct in_addr) > ipt->ipt_len)
813: goto bad;
1.13 mycroft 814: ipaddr.sin_addr = dst;
815: ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
816: m->m_pkthdr.rcvif);
817: if (ia == 0)
818: continue;
1.20 mycroft 819: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 820: (caddr_t)sin, sizeof(struct in_addr));
821: ipt->ipt_ptr += sizeof(struct in_addr);
822: break;
823:
824: case IPOPT_TS_PRESPEC:
825: if (ipt->ipt_ptr + sizeof(n_time) +
826: sizeof(struct in_addr) > ipt->ipt_len)
827: goto bad;
828: bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
829: sizeof(struct in_addr));
830: if (ifa_ifwithaddr((SA)&ipaddr) == 0)
831: continue;
832: ipt->ipt_ptr += sizeof(struct in_addr);
833: break;
834:
835: default:
836: goto bad;
837: }
838: ntime = iptime();
839: bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
840: sizeof(n_time));
841: ipt->ipt_ptr += sizeof(n_time);
842: }
843: }
844: if (forward) {
1.26 thorpej 845: if (ip_forwsrcrt == 0) {
846: type = ICMP_UNREACH;
847: code = ICMP_UNREACH_SRCFAIL;
848: goto bad;
849: }
1.1 cgd 850: ip_forward(m, 1);
851: return (1);
1.13 mycroft 852: }
853: return (0);
1.1 cgd 854: bad:
1.13 mycroft 855: ip->ip_len -= ip->ip_hl << 2; /* XXX icmp_error adds in hdr length */
856: icmp_error(m, type, code, 0, 0);
857: ipstat.ips_badoptions++;
1.1 cgd 858: return (1);
859: }
860:
861: /*
862: * Given address of next destination (final or next hop),
863: * return internet address info of interface to be used to get there.
864: */
865: struct in_ifaddr *
866: ip_rtaddr(dst)
867: struct in_addr dst;
868: {
869: register struct sockaddr_in *sin;
870:
1.19 mycroft 871: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 872:
1.35 mycroft 873: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 874: if (ipforward_rt.ro_rt) {
875: RTFREE(ipforward_rt.ro_rt);
876: ipforward_rt.ro_rt = 0;
877: }
878: sin->sin_family = AF_INET;
879: sin->sin_len = sizeof(*sin);
880: sin->sin_addr = dst;
881:
882: rtalloc(&ipforward_rt);
883: }
884: if (ipforward_rt.ro_rt == 0)
885: return ((struct in_ifaddr *)0);
1.19 mycroft 886: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 887: }
888:
889: /*
890: * Save incoming source route for use in replies,
891: * to be picked up later by ip_srcroute if the receiver is interested.
892: */
1.13 mycroft 893: void
1.1 cgd 894: save_rte(option, dst)
895: u_char *option;
896: struct in_addr dst;
897: {
898: unsigned olen;
899:
900: olen = option[IPOPT_OLEN];
901: #ifdef DIAGNOSTIC
902: if (ipprintfs)
1.39 christos 903: printf("save_rte: olen %d\n", olen);
1.1 cgd 904: #endif
905: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
906: return;
907: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
908: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
909: ip_srcrt.dst = dst;
910: }
911:
912: /*
913: * Retrieve incoming source route for use in replies,
914: * in the same form used by setsockopt.
915: * The first hop is placed before the options, will be removed later.
916: */
917: struct mbuf *
918: ip_srcroute()
919: {
920: register struct in_addr *p, *q;
921: register struct mbuf *m;
922:
923: if (ip_nhops == 0)
924: return ((struct mbuf *)0);
925: m = m_get(M_DONTWAIT, MT_SOOPTS);
926: if (m == 0)
927: return ((struct mbuf *)0);
928:
1.13 mycroft 929: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 930:
931: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
932: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
933: OPTSIZ;
934: #ifdef DIAGNOSTIC
935: if (ipprintfs)
1.39 christos 936: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 937: #endif
938:
939: /*
940: * First save first hop for return route
941: */
942: p = &ip_srcrt.route[ip_nhops - 1];
943: *(mtod(m, struct in_addr *)) = *p--;
944: #ifdef DIAGNOSTIC
945: if (ipprintfs)
1.39 christos 946: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 947: #endif
948:
949: /*
950: * Copy option fields and padding (nop) to mbuf.
951: */
952: ip_srcrt.nop = IPOPT_NOP;
953: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
954: bcopy((caddr_t)&ip_srcrt.nop,
955: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
956: q = (struct in_addr *)(mtod(m, caddr_t) +
957: sizeof(struct in_addr) + OPTSIZ);
958: #undef OPTSIZ
959: /*
960: * Record return path as an IP source route,
961: * reversing the path (pointers are now aligned).
962: */
963: while (p >= ip_srcrt.route) {
964: #ifdef DIAGNOSTIC
965: if (ipprintfs)
1.39 christos 966: printf(" %x", ntohl(q->s_addr));
1.1 cgd 967: #endif
968: *q++ = *p--;
969: }
970: /*
971: * Last hop goes to final destination.
972: */
973: *q = ip_srcrt.dst;
974: #ifdef DIAGNOSTIC
975: if (ipprintfs)
1.39 christos 976: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 977: #endif
978: return (m);
979: }
980:
981: /*
982: * Strip out IP options, at higher
983: * level protocol in the kernel.
984: * Second argument is buffer to which options
985: * will be moved, and return value is their length.
986: * XXX should be deleted; last arg currently ignored.
987: */
1.8 mycroft 988: void
1.1 cgd 989: ip_stripoptions(m, mopt)
990: register struct mbuf *m;
991: struct mbuf *mopt;
992: {
993: register int i;
994: struct ip *ip = mtod(m, struct ip *);
995: register caddr_t opts;
996: int olen;
997:
998: olen = (ip->ip_hl<<2) - sizeof (struct ip);
999: opts = (caddr_t)(ip + 1);
1000: i = m->m_len - (sizeof (struct ip) + olen);
1001: bcopy(opts + olen, opts, (unsigned)i);
1002: m->m_len -= olen;
1003: if (m->m_flags & M_PKTHDR)
1004: m->m_pkthdr.len -= olen;
1005: ip->ip_hl = sizeof(struct ip) >> 2;
1006: }
1007:
1.23 mycroft 1008: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1009: 0, 0, 0, 0,
1010: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1011: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1012: EMSGSIZE, EHOSTUNREACH, 0, 0,
1013: 0, 0, 0, 0,
1014: ENOPROTOOPT
1015: };
1016:
1017: /*
1018: * Forward a packet. If some error occurs return the sender
1019: * an icmp packet. Note we can't always generate a meaningful
1020: * icmp message because icmp doesn't have a large enough repertoire
1021: * of codes and types.
1022: *
1023: * If not forwarding, just drop the packet. This could be confusing
1024: * if ipforwarding was zero but some routing protocol was advancing
1025: * us as a gateway to somewhere. However, we must let the routing
1026: * protocol deal with that.
1027: *
1028: * The srcrt parameter indicates whether the packet is being forwarded
1029: * via a source route.
1030: */
1.13 mycroft 1031: void
1.1 cgd 1032: ip_forward(m, srcrt)
1033: struct mbuf *m;
1034: int srcrt;
1035: {
1036: register struct ip *ip = mtod(m, struct ip *);
1037: register struct sockaddr_in *sin;
1038: register struct rtentry *rt;
1.28 christos 1039: int error, type = 0, code = 0;
1.1 cgd 1040: struct mbuf *mcopy;
1.13 mycroft 1041: n_long dest;
1042: struct ifnet *destifp;
1.1 cgd 1043:
1.13 mycroft 1044: dest = 0;
1.1 cgd 1045: #ifdef DIAGNOSTIC
1046: if (ipprintfs)
1.39 christos 1047: printf("forward: src %x dst %x ttl %x\n",
1.35 mycroft 1048: ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl);
1.1 cgd 1049: #endif
1050: if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) {
1051: ipstat.ips_cantforward++;
1052: m_freem(m);
1053: return;
1054: }
1055: HTONS(ip->ip_id);
1056: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1057: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1058: return;
1059: }
1060: ip->ip_ttl -= IPTTLDEC;
1061:
1.19 mycroft 1062: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1063: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1064: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1065: if (ipforward_rt.ro_rt) {
1066: RTFREE(ipforward_rt.ro_rt);
1067: ipforward_rt.ro_rt = 0;
1068: }
1069: sin->sin_family = AF_INET;
1.35 mycroft 1070: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1071: sin->sin_addr = ip->ip_dst;
1072:
1073: rtalloc(&ipforward_rt);
1074: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1075: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1076: return;
1077: }
1078: rt = ipforward_rt.ro_rt;
1079: }
1080:
1081: /*
1.34 mycroft 1082: * Save at most 68 bytes of the packet in case
1.1 cgd 1083: * we need to generate an ICMP message to the src.
1084: */
1.34 mycroft 1085: mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1 cgd 1086:
1087: /*
1088: * If forwarding packet using same interface that it came in on,
1089: * perhaps should send a redirect to sender to shortcut a hop.
1090: * Only send redirect if source is sending directly to us,
1091: * and if packet was not source routed (or has any options).
1092: * Also, don't send redirect if forwarding using a default route
1093: * or a route modified by a redirect.
1094: */
1095: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1096: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1097: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1098: ipsendredirects && !srcrt) {
1.19 mycroft 1099: if (rt->rt_ifa &&
1100: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1101: ifatoia(rt->rt_ifa)->ia_subnet) {
1.1 cgd 1102: if (rt->rt_flags & RTF_GATEWAY)
1.13 mycroft 1103: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1.1 cgd 1104: else
1.13 mycroft 1105: dest = ip->ip_dst.s_addr;
1106: /* Router requirements says to only send host redirects */
1.1 cgd 1107: type = ICMP_REDIRECT;
1.13 mycroft 1108: code = ICMP_REDIRECT_HOST;
1.1 cgd 1109: #ifdef DIAGNOSTIC
1110: if (ipprintfs)
1.39 christos 1111: printf("redirect (%d) to %x\n", code, (u_int32_t)dest);
1.1 cgd 1112: #endif
1113: }
1114: }
1115:
1.27 thorpej 1116: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1117: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1118: if (error)
1119: ipstat.ips_cantforward++;
1120: else {
1121: ipstat.ips_forward++;
1122: if (type)
1123: ipstat.ips_redirectsent++;
1124: else {
1125: if (mcopy)
1126: m_freem(mcopy);
1127: return;
1128: }
1129: }
1130: if (mcopy == NULL)
1131: return;
1.13 mycroft 1132: destifp = NULL;
1133:
1.1 cgd 1134: switch (error) {
1135:
1136: case 0: /* forwarded, but need redirect */
1137: /* type, code set above */
1138: break;
1139:
1140: case ENETUNREACH: /* shouldn't happen, checked above */
1141: case EHOSTUNREACH:
1142: case ENETDOWN:
1143: case EHOSTDOWN:
1144: default:
1145: type = ICMP_UNREACH;
1146: code = ICMP_UNREACH_HOST;
1147: break;
1148:
1149: case EMSGSIZE:
1150: type = ICMP_UNREACH;
1151: code = ICMP_UNREACH_NEEDFRAG;
1.13 mycroft 1152: if (ipforward_rt.ro_rt)
1153: destifp = ipforward_rt.ro_rt->rt_ifp;
1.1 cgd 1154: ipstat.ips_cantfrag++;
1155: break;
1156:
1157: case ENOBUFS:
1158: type = ICMP_SOURCEQUENCH;
1159: code = 0;
1160: break;
1161: }
1.13 mycroft 1162: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1163: }
1164:
1165: void
1166: ip_savecontrol(inp, mp, ip, m)
1167: register struct inpcb *inp;
1168: register struct mbuf **mp;
1169: register struct ip *ip;
1170: register struct mbuf *m;
1171: {
1172:
1173: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1174: struct timeval tv;
1175:
1176: microtime(&tv);
1177: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1178: SCM_TIMESTAMP, SOL_SOCKET);
1179: if (*mp)
1180: mp = &(*mp)->m_next;
1181: }
1182: if (inp->inp_flags & INP_RECVDSTADDR) {
1183: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1184: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1185: if (*mp)
1186: mp = &(*mp)->m_next;
1187: }
1188: #ifdef notyet
1189: /*
1190: * XXX
1191: * Moving these out of udp_input() made them even more broken
1192: * than they already were.
1193: * - fenner@parc.xerox.com
1194: */
1195: /* options were tossed already */
1196: if (inp->inp_flags & INP_RECVOPTS) {
1197: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1198: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1199: if (*mp)
1200: mp = &(*mp)->m_next;
1201: }
1202: /* ip_srcroute doesn't do what we want here, need to fix */
1203: if (inp->inp_flags & INP_RECVRETOPTS) {
1204: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1205: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1206: if (*mp)
1207: mp = &(*mp)->m_next;
1208: }
1209: #endif
1210: if (inp->inp_flags & INP_RECVIF) {
1211: struct sockaddr_dl sdl;
1212:
1213: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1214: sdl.sdl_family = AF_LINK;
1215: sdl.sdl_index = m->m_pkthdr.rcvif ?
1216: m->m_pkthdr.rcvif->if_index : 0;
1217: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1218: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1219: IP_RECVIF, IPPROTO_IP);
1220: if (*mp)
1221: mp = &(*mp)->m_next;
1222: }
1.13 mycroft 1223: }
1224:
1225: int
1226: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1227: int *name;
1228: u_int namelen;
1229: void *oldp;
1230: size_t *oldlenp;
1231: void *newp;
1232: size_t newlen;
1233: {
1234: /* All sysctl names at this level are terminal. */
1235: if (namelen != 1)
1236: return (ENOTDIR);
1237:
1238: switch (name[0]) {
1239: case IPCTL_FORWARDING:
1240: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1241: case IPCTL_SENDREDIRECTS:
1242: return (sysctl_int(oldp, oldlenp, newp, newlen,
1243: &ipsendredirects));
1244: case IPCTL_DEFTTL:
1245: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1246: #ifdef notyet
1247: case IPCTL_DEFMTU:
1248: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1249: #endif
1.26 thorpej 1250: case IPCTL_FORWSRCRT:
1251: /*
1252: * Don't allow this to change in a secure environment.
1253: */
1254: if (securelevel > 0)
1.46 ! cjs 1255: return (sysctl_rdint(oldp, oldlenp, newp,
! 1256: ip_forwsrcrt));
! 1257: else
! 1258: return (sysctl_int(oldp, oldlenp, newp, newlen,
! 1259: &ip_forwsrcrt));
1.27 thorpej 1260: case IPCTL_DIRECTEDBCAST:
1261: return (sysctl_int(oldp, oldlenp, newp, newlen,
1262: &ip_directedbcast));
1.13 mycroft 1263: default:
1264: return (EOPNOTSUPP);
1265: }
1266: /* NOTREACHED */
1.1 cgd 1267: }
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