Annotation of src/sys/netinet/ip_input.c, Revision 1.51
1.51 ! gwr 1: /* $NetBSD: ip_input.c,v 1.50 1997/06/24 02:26:04 thorpej 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: if (rv)
1.40 veego 262: goto next;
1.49 christos 263: ip = mtod(m = m0, struct ip *);
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: }
1.51 ! gwr 296: /*
! 297: * An interface with IP address zero accepts
! 298: * all packets that arrive on that interface.
! 299: */
! 300: if ((ia->ia_ifp == m->m_pkthdr.rcvif) &&
! 301: in_nullhost(ia->ia_addr.sin_addr))
! 302: goto ours;
1.1 cgd 303: }
1.18 mycroft 304: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 305: struct in_multi *inm;
306: #ifdef MROUTING
307: extern struct socket *ip_mrouter;
1.10 brezak 308:
309: if (m->m_flags & M_EXT) {
310: if ((m = m_pullup(m, hlen)) == 0) {
311: ipstat.ips_toosmall++;
312: goto next;
313: }
314: ip = mtod(m, struct ip *);
315: }
1.4 hpeyerl 316:
317: if (ip_mrouter) {
318: /*
319: * If we are acting as a multicast router, all
320: * incoming multicast packets are passed to the
321: * kernel-level multicast forwarding function.
322: * The packet is returned (relatively) intact; if
323: * ip_mforward() returns a non-zero value, the packet
324: * must be discarded, else it may be accepted below.
325: *
326: * (The IP ident field is put in the same byte order
327: * as expected when ip_mforward() is called from
328: * ip_output().)
329: */
330: ip->ip_id = htons(ip->ip_id);
1.13 mycroft 331: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
332: ipstat.ips_cantforward++;
1.4 hpeyerl 333: m_freem(m);
334: goto next;
335: }
336: ip->ip_id = ntohs(ip->ip_id);
337:
338: /*
339: * The process-level routing demon needs to receive
340: * all multicast IGMP packets, whether or not this
341: * host belongs to their destination groups.
342: */
343: if (ip->ip_p == IPPROTO_IGMP)
344: goto ours;
1.13 mycroft 345: ipstat.ips_forward++;
1.4 hpeyerl 346: }
347: #endif
348: /*
349: * See if we belong to the destination multicast group on the
350: * arrival interface.
351: */
352: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
353: if (inm == NULL) {
1.13 mycroft 354: ipstat.ips_cantforward++;
1.4 hpeyerl 355: m_freem(m);
356: goto next;
357: }
358: goto ours;
359: }
1.19 mycroft 360: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 361: in_nullhost(ip->ip_dst))
1.1 cgd 362: goto ours;
363:
364: /*
365: * Not for us; forward if possible and desirable.
366: */
367: if (ipforwarding == 0) {
368: ipstat.ips_cantforward++;
369: m_freem(m);
370: } else
371: ip_forward(m, 0);
372: goto next;
373:
374: ours:
375: /*
376: * If offset or IP_MF are set, must reassemble.
377: * Otherwise, nothing need be done.
378: * (We could look in the reassembly queue to see
379: * if the packet was previously fragmented,
380: * but it's not worth the time; just let them time out.)
381: */
1.37 perry 382: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 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;
1.50 thorpej 429: ipqe->ipqe_m = m;
1.25 cgd 430: ipqe->ipqe_ip = ip;
1.50 thorpej 431: m = ip_reass(ipqe, fp);
432: if (m == 0)
1.1 cgd 433: goto next;
1.13 mycroft 434: ipstat.ips_reassembled++;
1.50 thorpej 435: ip = mtod(m, struct ip *);
1.1 cgd 436: } else
437: if (fp)
438: ip_freef(fp);
439: } else
440: ip->ip_len -= hlen;
441:
442: /*
443: * Switch out to protocol's input routine.
444: */
445: ipstat.ips_delivered++;
446: (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
447: goto next;
448: bad:
449: m_freem(m);
450: goto next;
451: }
452:
453: /*
454: * Take incoming datagram fragment and try to
455: * reassemble it into whole datagram. If a chain for
456: * reassembly of this datagram already exists, then it
457: * is given as fp; otherwise have to make a chain.
458: */
1.50 thorpej 459: struct mbuf *
1.25 cgd 460: ip_reass(ipqe, fp)
461: register struct ipqent *ipqe;
1.1 cgd 462: register struct ipq *fp;
463: {
1.50 thorpej 464: register struct mbuf *m = ipqe->ipqe_m;
1.25 cgd 465: register struct ipqent *nq, *p, *q;
466: struct ip *ip;
1.1 cgd 467: struct mbuf *t;
1.25 cgd 468: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 469: int i, next;
470:
471: /*
472: * Presence of header sizes in mbufs
473: * would confuse code below.
474: */
475: m->m_data += hlen;
476: m->m_len -= hlen;
477:
478: /*
479: * If first fragment to arrive, create a reassembly queue.
480: */
481: if (fp == 0) {
1.50 thorpej 482: MALLOC(fp, struct ipq *, sizeof (struct ipq),
483: M_FTABLE, M_NOWAIT);
484: if (fp == NULL)
1.1 cgd 485: goto dropfrag;
1.25 cgd 486: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 487: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 488: fp->ipq_p = ipqe->ipqe_ip->ip_p;
489: fp->ipq_id = ipqe->ipqe_ip->ip_id;
490: LIST_INIT(&fp->ipq_fragq);
491: fp->ipq_src = ipqe->ipqe_ip->ip_src;
492: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
493: p = NULL;
1.1 cgd 494: goto insert;
495: }
496:
497: /*
498: * Find a segment which begins after this one does.
499: */
1.25 cgd 500: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
501: p = q, q = q->ipqe_q.le_next)
502: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 503: break;
504:
505: /*
506: * If there is a preceding segment, it may provide some of
507: * our data already. If so, drop the data from the incoming
508: * segment. If it provides all of our data, drop us.
509: */
1.25 cgd 510: if (p != NULL) {
511: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
512: ipqe->ipqe_ip->ip_off;
1.1 cgd 513: if (i > 0) {
1.25 cgd 514: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 515: goto dropfrag;
1.50 thorpej 516: m_adj(ipqe->ipqe_m, i);
1.25 cgd 517: ipqe->ipqe_ip->ip_off += i;
518: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 519: }
520: }
521:
522: /*
523: * While we overlap succeeding segments trim them or,
524: * if they are completely covered, dequeue them.
525: */
1.25 cgd 526: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
527: q->ipqe_ip->ip_off; q = nq) {
528: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
529: q->ipqe_ip->ip_off;
530: if (i < q->ipqe_ip->ip_len) {
531: q->ipqe_ip->ip_len -= i;
532: q->ipqe_ip->ip_off += i;
1.50 thorpej 533: m_adj(q->ipqe_m, i);
1.1 cgd 534: break;
535: }
1.25 cgd 536: nq = q->ipqe_q.le_next;
1.50 thorpej 537: m_freem(q->ipqe_m);
1.25 cgd 538: LIST_REMOVE(q, ipqe_q);
539: FREE(q, M_IPQ);
1.1 cgd 540: }
541:
542: insert:
543: /*
544: * Stick new segment in its place;
545: * check for complete reassembly.
546: */
1.25 cgd 547: if (p == NULL) {
548: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
549: } else {
550: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
551: }
1.1 cgd 552: next = 0;
1.25 cgd 553: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
554: p = q, q = q->ipqe_q.le_next) {
555: if (q->ipqe_ip->ip_off != next)
1.1 cgd 556: return (0);
1.25 cgd 557: next += q->ipqe_ip->ip_len;
1.1 cgd 558: }
1.25 cgd 559: if (p->ipqe_mff)
1.1 cgd 560: return (0);
561:
562: /*
1.41 thorpej 563: * Reassembly is complete. Check for a bogus message size and
564: * concatenate fragments.
1.1 cgd 565: */
1.25 cgd 566: q = fp->ipq_fragq.lh_first;
567: ip = q->ipqe_ip;
1.41 thorpej 568: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
569: ipstat.ips_toolong++;
570: ip_freef(fp);
571: return (0);
572: }
1.50 thorpej 573: m = q->ipqe_m;
1.1 cgd 574: t = m->m_next;
575: m->m_next = 0;
576: m_cat(m, t);
1.25 cgd 577: nq = q->ipqe_q.le_next;
578: FREE(q, M_IPQ);
579: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 580: t = q->ipqe_m;
1.25 cgd 581: nq = q->ipqe_q.le_next;
582: FREE(q, M_IPQ);
1.1 cgd 583: m_cat(m, t);
584: }
585:
586: /*
587: * Create header for new ip packet by
588: * modifying header of first packet;
589: * dequeue and discard fragment reassembly header.
590: * Make header visible.
591: */
592: ip->ip_len = next;
1.25 cgd 593: ip->ip_src = fp->ipq_src;
594: ip->ip_dst = fp->ipq_dst;
595: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 596: FREE(fp, M_FTABLE);
1.1 cgd 597: m->m_len += (ip->ip_hl << 2);
598: m->m_data -= (ip->ip_hl << 2);
599: /* some debugging cruft by sklower, below, will go away soon */
600: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
601: register int plen = 0;
1.50 thorpej 602: for (t = m; t; t = t->m_next)
603: plen += t->m_len;
604: m->m_pkthdr.len = plen;
1.1 cgd 605: }
1.50 thorpej 606: return (m);
1.1 cgd 607:
608: dropfrag:
609: ipstat.ips_fragdropped++;
610: m_freem(m);
1.25 cgd 611: FREE(ipqe, M_IPQ);
1.1 cgd 612: return (0);
613: }
614:
615: /*
616: * Free a fragment reassembly header and all
617: * associated datagrams.
618: */
1.8 mycroft 619: void
1.1 cgd 620: ip_freef(fp)
621: struct ipq *fp;
622: {
1.25 cgd 623: register struct ipqent *q, *p;
1.1 cgd 624:
1.25 cgd 625: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
626: p = q->ipqe_q.le_next;
1.50 thorpej 627: m_freem(q->ipqe_m);
1.25 cgd 628: LIST_REMOVE(q, ipqe_q);
629: FREE(q, M_IPQ);
1.1 cgd 630: }
1.25 cgd 631: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 632: FREE(fp, M_FTABLE);
1.1 cgd 633: }
634:
635: /*
636: * IP timer processing;
637: * if a timer expires on a reassembly
638: * queue, discard it.
639: */
1.8 mycroft 640: void
1.1 cgd 641: ip_slowtimo()
642: {
1.25 cgd 643: register struct ipq *fp, *nfp;
1.24 mycroft 644: int s = splsoftnet();
1.1 cgd 645:
1.25 cgd 646: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
647: nfp = fp->ipq_q.le_next;
648: if (--fp->ipq_ttl == 0) {
1.1 cgd 649: ipstat.ips_fragtimeout++;
1.25 cgd 650: ip_freef(fp);
1.1 cgd 651: }
652: }
653: splx(s);
654: }
655:
656: /*
657: * Drain off all datagram fragments.
658: */
1.8 mycroft 659: void
1.1 cgd 660: ip_drain()
661: {
662:
1.25 cgd 663: while (ipq.lh_first != NULL) {
1.1 cgd 664: ipstat.ips_fragdropped++;
1.25 cgd 665: ip_freef(ipq.lh_first);
1.1 cgd 666: }
667: }
668:
669: /*
670: * Do option processing on a datagram,
671: * possibly discarding it if bad options are encountered,
672: * or forwarding it if source-routed.
673: * Returns 1 if packet has been forwarded/freed,
674: * 0 if the packet should be processed further.
675: */
1.8 mycroft 676: int
1.1 cgd 677: ip_dooptions(m)
678: struct mbuf *m;
679: {
680: register struct ip *ip = mtod(m, struct ip *);
681: register u_char *cp;
682: register struct ip_timestamp *ipt;
683: register struct in_ifaddr *ia;
684: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.13 mycroft 685: struct in_addr *sin, dst;
1.1 cgd 686: n_time ntime;
687:
1.13 mycroft 688: dst = ip->ip_dst;
1.1 cgd 689: cp = (u_char *)(ip + 1);
690: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
691: for (; cnt > 0; cnt -= optlen, cp += optlen) {
692: opt = cp[IPOPT_OPTVAL];
693: if (opt == IPOPT_EOL)
694: break;
695: if (opt == IPOPT_NOP)
696: optlen = 1;
697: else {
698: optlen = cp[IPOPT_OLEN];
699: if (optlen <= 0 || optlen > cnt) {
700: code = &cp[IPOPT_OLEN] - (u_char *)ip;
701: goto bad;
702: }
703: }
704: switch (opt) {
705:
706: default:
707: break;
708:
709: /*
710: * Source routing with record.
711: * Find interface with current destination address.
712: * If none on this machine then drop if strictly routed,
713: * or do nothing if loosely routed.
714: * Record interface address and bring up next address
715: * component. If strictly routed make sure next
716: * address is on directly accessible net.
717: */
718: case IPOPT_LSRR:
719: case IPOPT_SSRR:
1.47 cjs 720: if (ip_allowsrcrt == 0) {
721: type = ICMP_UNREACH;
722: code = ICMP_UNREACH_NET_PROHIB;
723: goto bad;
724: }
1.1 cgd 725: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
726: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
727: goto bad;
728: }
729: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 730: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 731: if (ia == 0) {
732: if (opt == IPOPT_SSRR) {
733: type = ICMP_UNREACH;
734: code = ICMP_UNREACH_SRCFAIL;
735: goto bad;
736: }
737: /*
738: * Loose routing, and not at next destination
739: * yet; nothing to do except forward.
740: */
741: break;
742: }
743: off--; /* 0 origin */
744: if (off > optlen - sizeof(struct in_addr)) {
745: /*
746: * End of source route. Should be for us.
747: */
748: save_rte(cp, ip->ip_src);
749: break;
750: }
751: /*
752: * locate outgoing interface
753: */
754: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
755: sizeof(ipaddr.sin_addr));
756: if (opt == IPOPT_SSRR) {
757: #define INA struct in_ifaddr *
758: #define SA struct sockaddr *
1.29 mrg 759: ia = (INA)ifa_ifwithladdr((SA)&ipaddr);
1.1 cgd 760: } else
761: ia = ip_rtaddr(ipaddr.sin_addr);
762: if (ia == 0) {
763: type = ICMP_UNREACH;
764: code = ICMP_UNREACH_SRCFAIL;
765: goto bad;
766: }
767: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 768: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 769: (caddr_t)(cp + off), sizeof(struct in_addr));
770: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 771: /*
772: * Let ip_intr's mcast routing check handle mcast pkts
773: */
1.18 mycroft 774: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 775: break;
776:
777: case IPOPT_RR:
778: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
779: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
780: goto bad;
781: }
782: /*
783: * If no space remains, ignore.
784: */
785: off--; /* 0 origin */
786: if (off > optlen - sizeof(struct in_addr))
787: break;
788: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
789: sizeof(ipaddr.sin_addr));
790: /*
791: * locate outgoing interface; if we're the destination,
792: * use the incoming interface (should be same).
793: */
794: if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
795: (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
796: type = ICMP_UNREACH;
797: code = ICMP_UNREACH_HOST;
798: goto bad;
799: }
1.20 mycroft 800: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 801: (caddr_t)(cp + off), sizeof(struct in_addr));
802: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
803: break;
804:
805: case IPOPT_TS:
806: code = cp - (u_char *)ip;
807: ipt = (struct ip_timestamp *)cp;
808: if (ipt->ipt_len < 5)
809: goto bad;
1.15 cgd 810: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1 cgd 811: if (++ipt->ipt_oflw == 0)
812: goto bad;
813: break;
814: }
815: sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
816: switch (ipt->ipt_flg) {
817:
818: case IPOPT_TS_TSONLY:
819: break;
820:
821: case IPOPT_TS_TSANDADDR:
822: if (ipt->ipt_ptr + sizeof(n_time) +
823: sizeof(struct in_addr) > ipt->ipt_len)
824: goto bad;
1.13 mycroft 825: ipaddr.sin_addr = dst;
826: ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
827: m->m_pkthdr.rcvif);
828: if (ia == 0)
829: continue;
1.20 mycroft 830: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 831: (caddr_t)sin, sizeof(struct in_addr));
832: ipt->ipt_ptr += sizeof(struct in_addr);
833: break;
834:
835: case IPOPT_TS_PRESPEC:
836: if (ipt->ipt_ptr + sizeof(n_time) +
837: sizeof(struct in_addr) > ipt->ipt_len)
838: goto bad;
839: bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
840: sizeof(struct in_addr));
841: if (ifa_ifwithaddr((SA)&ipaddr) == 0)
842: continue;
843: ipt->ipt_ptr += sizeof(struct in_addr);
844: break;
845:
846: default:
847: goto bad;
848: }
849: ntime = iptime();
850: bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
851: sizeof(n_time));
852: ipt->ipt_ptr += sizeof(n_time);
853: }
854: }
855: if (forward) {
1.26 thorpej 856: if (ip_forwsrcrt == 0) {
857: type = ICMP_UNREACH;
858: code = ICMP_UNREACH_SRCFAIL;
859: goto bad;
860: }
1.1 cgd 861: ip_forward(m, 1);
862: return (1);
1.13 mycroft 863: }
864: return (0);
1.1 cgd 865: bad:
1.13 mycroft 866: ip->ip_len -= ip->ip_hl << 2; /* XXX icmp_error adds in hdr length */
867: icmp_error(m, type, code, 0, 0);
868: ipstat.ips_badoptions++;
1.1 cgd 869: return (1);
870: }
871:
872: /*
873: * Given address of next destination (final or next hop),
874: * return internet address info of interface to be used to get there.
875: */
876: struct in_ifaddr *
877: ip_rtaddr(dst)
878: struct in_addr dst;
879: {
880: register struct sockaddr_in *sin;
881:
1.19 mycroft 882: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 883:
1.35 mycroft 884: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 885: if (ipforward_rt.ro_rt) {
886: RTFREE(ipforward_rt.ro_rt);
887: ipforward_rt.ro_rt = 0;
888: }
889: sin->sin_family = AF_INET;
890: sin->sin_len = sizeof(*sin);
891: sin->sin_addr = dst;
892:
893: rtalloc(&ipforward_rt);
894: }
895: if (ipforward_rt.ro_rt == 0)
896: return ((struct in_ifaddr *)0);
1.19 mycroft 897: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 898: }
899:
900: /*
901: * Save incoming source route for use in replies,
902: * to be picked up later by ip_srcroute if the receiver is interested.
903: */
1.13 mycroft 904: void
1.1 cgd 905: save_rte(option, dst)
906: u_char *option;
907: struct in_addr dst;
908: {
909: unsigned olen;
910:
911: olen = option[IPOPT_OLEN];
912: #ifdef DIAGNOSTIC
913: if (ipprintfs)
1.39 christos 914: printf("save_rte: olen %d\n", olen);
1.1 cgd 915: #endif
916: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
917: return;
918: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
919: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
920: ip_srcrt.dst = dst;
921: }
922:
923: /*
924: * Retrieve incoming source route for use in replies,
925: * in the same form used by setsockopt.
926: * The first hop is placed before the options, will be removed later.
927: */
928: struct mbuf *
929: ip_srcroute()
930: {
931: register struct in_addr *p, *q;
932: register struct mbuf *m;
933:
934: if (ip_nhops == 0)
935: return ((struct mbuf *)0);
936: m = m_get(M_DONTWAIT, MT_SOOPTS);
937: if (m == 0)
938: return ((struct mbuf *)0);
939:
1.13 mycroft 940: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 941:
942: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
943: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
944: OPTSIZ;
945: #ifdef DIAGNOSTIC
946: if (ipprintfs)
1.39 christos 947: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 948: #endif
949:
950: /*
951: * First save first hop for return route
952: */
953: p = &ip_srcrt.route[ip_nhops - 1];
954: *(mtod(m, struct in_addr *)) = *p--;
955: #ifdef DIAGNOSTIC
956: if (ipprintfs)
1.39 christos 957: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 958: #endif
959:
960: /*
961: * Copy option fields and padding (nop) to mbuf.
962: */
963: ip_srcrt.nop = IPOPT_NOP;
964: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
965: bcopy((caddr_t)&ip_srcrt.nop,
966: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
967: q = (struct in_addr *)(mtod(m, caddr_t) +
968: sizeof(struct in_addr) + OPTSIZ);
969: #undef OPTSIZ
970: /*
971: * Record return path as an IP source route,
972: * reversing the path (pointers are now aligned).
973: */
974: while (p >= ip_srcrt.route) {
975: #ifdef DIAGNOSTIC
976: if (ipprintfs)
1.39 christos 977: printf(" %x", ntohl(q->s_addr));
1.1 cgd 978: #endif
979: *q++ = *p--;
980: }
981: /*
982: * Last hop goes to final destination.
983: */
984: *q = ip_srcrt.dst;
985: #ifdef DIAGNOSTIC
986: if (ipprintfs)
1.39 christos 987: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 988: #endif
989: return (m);
990: }
991:
992: /*
993: * Strip out IP options, at higher
994: * level protocol in the kernel.
995: * Second argument is buffer to which options
996: * will be moved, and return value is their length.
997: * XXX should be deleted; last arg currently ignored.
998: */
1.8 mycroft 999: void
1.1 cgd 1000: ip_stripoptions(m, mopt)
1001: register struct mbuf *m;
1002: struct mbuf *mopt;
1003: {
1004: register int i;
1005: struct ip *ip = mtod(m, struct ip *);
1006: register caddr_t opts;
1007: int olen;
1008:
1009: olen = (ip->ip_hl<<2) - sizeof (struct ip);
1010: opts = (caddr_t)(ip + 1);
1011: i = m->m_len - (sizeof (struct ip) + olen);
1012: bcopy(opts + olen, opts, (unsigned)i);
1013: m->m_len -= olen;
1014: if (m->m_flags & M_PKTHDR)
1015: m->m_pkthdr.len -= olen;
1016: ip->ip_hl = sizeof(struct ip) >> 2;
1017: }
1018:
1.23 mycroft 1019: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1020: 0, 0, 0, 0,
1021: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1022: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1023: EMSGSIZE, EHOSTUNREACH, 0, 0,
1024: 0, 0, 0, 0,
1025: ENOPROTOOPT
1026: };
1027:
1028: /*
1029: * Forward a packet. If some error occurs return the sender
1030: * an icmp packet. Note we can't always generate a meaningful
1031: * icmp message because icmp doesn't have a large enough repertoire
1032: * of codes and types.
1033: *
1034: * If not forwarding, just drop the packet. This could be confusing
1035: * if ipforwarding was zero but some routing protocol was advancing
1036: * us as a gateway to somewhere. However, we must let the routing
1037: * protocol deal with that.
1038: *
1039: * The srcrt parameter indicates whether the packet is being forwarded
1040: * via a source route.
1041: */
1.13 mycroft 1042: void
1.1 cgd 1043: ip_forward(m, srcrt)
1044: struct mbuf *m;
1045: int srcrt;
1046: {
1047: register struct ip *ip = mtod(m, struct ip *);
1048: register struct sockaddr_in *sin;
1049: register struct rtentry *rt;
1.28 christos 1050: int error, type = 0, code = 0;
1.1 cgd 1051: struct mbuf *mcopy;
1.13 mycroft 1052: n_long dest;
1053: struct ifnet *destifp;
1.1 cgd 1054:
1.13 mycroft 1055: dest = 0;
1.1 cgd 1056: #ifdef DIAGNOSTIC
1057: if (ipprintfs)
1.39 christos 1058: printf("forward: src %x dst %x ttl %x\n",
1.35 mycroft 1059: ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl);
1.1 cgd 1060: #endif
1061: if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) {
1062: ipstat.ips_cantforward++;
1063: m_freem(m);
1064: return;
1065: }
1066: HTONS(ip->ip_id);
1067: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1068: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1069: return;
1070: }
1071: ip->ip_ttl -= IPTTLDEC;
1072:
1.19 mycroft 1073: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1074: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1075: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1076: if (ipforward_rt.ro_rt) {
1077: RTFREE(ipforward_rt.ro_rt);
1078: ipforward_rt.ro_rt = 0;
1079: }
1080: sin->sin_family = AF_INET;
1.35 mycroft 1081: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1082: sin->sin_addr = ip->ip_dst;
1083:
1084: rtalloc(&ipforward_rt);
1085: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1086: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1087: return;
1088: }
1089: rt = ipforward_rt.ro_rt;
1090: }
1091:
1092: /*
1.34 mycroft 1093: * Save at most 68 bytes of the packet in case
1.1 cgd 1094: * we need to generate an ICMP message to the src.
1095: */
1.34 mycroft 1096: mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1 cgd 1097:
1098: /*
1099: * If forwarding packet using same interface that it came in on,
1100: * perhaps should send a redirect to sender to shortcut a hop.
1101: * Only send redirect if source is sending directly to us,
1102: * and if packet was not source routed (or has any options).
1103: * Also, don't send redirect if forwarding using a default route
1104: * or a route modified by a redirect.
1105: */
1106: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1107: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1108: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1109: ipsendredirects && !srcrt) {
1.19 mycroft 1110: if (rt->rt_ifa &&
1111: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1112: ifatoia(rt->rt_ifa)->ia_subnet) {
1.1 cgd 1113: if (rt->rt_flags & RTF_GATEWAY)
1.13 mycroft 1114: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1.1 cgd 1115: else
1.13 mycroft 1116: dest = ip->ip_dst.s_addr;
1117: /* Router requirements says to only send host redirects */
1.1 cgd 1118: type = ICMP_REDIRECT;
1.13 mycroft 1119: code = ICMP_REDIRECT_HOST;
1.1 cgd 1120: #ifdef DIAGNOSTIC
1121: if (ipprintfs)
1.39 christos 1122: printf("redirect (%d) to %x\n", code, (u_int32_t)dest);
1.1 cgd 1123: #endif
1124: }
1125: }
1126:
1.27 thorpej 1127: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1128: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1129: if (error)
1130: ipstat.ips_cantforward++;
1131: else {
1132: ipstat.ips_forward++;
1133: if (type)
1134: ipstat.ips_redirectsent++;
1135: else {
1136: if (mcopy)
1137: m_freem(mcopy);
1138: return;
1139: }
1140: }
1141: if (mcopy == NULL)
1142: return;
1.13 mycroft 1143: destifp = NULL;
1144:
1.1 cgd 1145: switch (error) {
1146:
1147: case 0: /* forwarded, but need redirect */
1148: /* type, code set above */
1149: break;
1150:
1151: case ENETUNREACH: /* shouldn't happen, checked above */
1152: case EHOSTUNREACH:
1153: case ENETDOWN:
1154: case EHOSTDOWN:
1155: default:
1156: type = ICMP_UNREACH;
1157: code = ICMP_UNREACH_HOST;
1158: break;
1159:
1160: case EMSGSIZE:
1161: type = ICMP_UNREACH;
1162: code = ICMP_UNREACH_NEEDFRAG;
1.13 mycroft 1163: if (ipforward_rt.ro_rt)
1164: destifp = ipforward_rt.ro_rt->rt_ifp;
1.1 cgd 1165: ipstat.ips_cantfrag++;
1166: break;
1167:
1168: case ENOBUFS:
1169: type = ICMP_SOURCEQUENCH;
1170: code = 0;
1171: break;
1172: }
1.13 mycroft 1173: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1174: }
1175:
1176: void
1177: ip_savecontrol(inp, mp, ip, m)
1178: register struct inpcb *inp;
1179: register struct mbuf **mp;
1180: register struct ip *ip;
1181: register struct mbuf *m;
1182: {
1183:
1184: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1185: struct timeval tv;
1186:
1187: microtime(&tv);
1188: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1189: SCM_TIMESTAMP, SOL_SOCKET);
1190: if (*mp)
1191: mp = &(*mp)->m_next;
1192: }
1193: if (inp->inp_flags & INP_RECVDSTADDR) {
1194: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1195: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1196: if (*mp)
1197: mp = &(*mp)->m_next;
1198: }
1199: #ifdef notyet
1200: /*
1201: * XXX
1202: * Moving these out of udp_input() made them even more broken
1203: * than they already were.
1204: * - fenner@parc.xerox.com
1205: */
1206: /* options were tossed already */
1207: if (inp->inp_flags & INP_RECVOPTS) {
1208: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1209: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1210: if (*mp)
1211: mp = &(*mp)->m_next;
1212: }
1213: /* ip_srcroute doesn't do what we want here, need to fix */
1214: if (inp->inp_flags & INP_RECVRETOPTS) {
1215: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1216: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1217: if (*mp)
1218: mp = &(*mp)->m_next;
1219: }
1220: #endif
1221: if (inp->inp_flags & INP_RECVIF) {
1222: struct sockaddr_dl sdl;
1223:
1224: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1225: sdl.sdl_family = AF_LINK;
1226: sdl.sdl_index = m->m_pkthdr.rcvif ?
1227: m->m_pkthdr.rcvif->if_index : 0;
1228: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1229: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1230: IP_RECVIF, IPPROTO_IP);
1231: if (*mp)
1232: mp = &(*mp)->m_next;
1233: }
1.13 mycroft 1234: }
1235:
1236: int
1237: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1238: int *name;
1239: u_int namelen;
1240: void *oldp;
1241: size_t *oldlenp;
1242: void *newp;
1243: size_t newlen;
1244: {
1245: /* All sysctl names at this level are terminal. */
1246: if (namelen != 1)
1247: return (ENOTDIR);
1248:
1249: switch (name[0]) {
1250: case IPCTL_FORWARDING:
1251: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1252: case IPCTL_SENDREDIRECTS:
1253: return (sysctl_int(oldp, oldlenp, newp, newlen,
1254: &ipsendredirects));
1255: case IPCTL_DEFTTL:
1256: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1257: #ifdef notyet
1258: case IPCTL_DEFMTU:
1259: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1260: #endif
1.26 thorpej 1261: case IPCTL_FORWSRCRT:
1.47 cjs 1262: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1263: if (securelevel > 0)
1.46 cjs 1264: return (sysctl_rdint(oldp, oldlenp, newp,
1265: ip_forwsrcrt));
1266: else
1267: return (sysctl_int(oldp, oldlenp, newp, newlen,
1268: &ip_forwsrcrt));
1.27 thorpej 1269: case IPCTL_DIRECTEDBCAST:
1270: return (sysctl_int(oldp, oldlenp, newp, newlen,
1271: &ip_directedbcast));
1.47 cjs 1272: case IPCTL_ALLOWSRCRT:
1273: return (sysctl_int(oldp, oldlenp, newp, newlen,
1274: &ip_allowsrcrt));
1.13 mycroft 1275: default:
1276: return (EOPNOTSUPP);
1277: }
1278: /* NOTREACHED */
1.1 cgd 1279: }
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