Annotation of src/sys/netinet/ip_input.c, Revision 1.53.2.1
1.53.2.1! mycroft 1: /* $NetBSD: ip_input.c,v 1.53 1997/10/18 21:18:31 kml 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
1.53 kml 86: #ifndef IPMTUDISC
87: #define IPMTUDISC 0
88: #endif
1.53.2.1! mycroft 89: #ifndef IPMTUDISCTIMEOUT
! 90: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
! 91: #endif
! 92:
1.53 kml 93:
1.27 thorpej 94: /*
95: * Note: DIRECTED_BROADCAST is handled this way so that previous
96: * configuration using this option will Just Work.
97: */
98: #ifndef IPDIRECTEDBCAST
99: #ifdef DIRECTED_BROADCAST
100: #define IPDIRECTEDBCAST 1
101: #else
102: #define IPDIRECTEDBCAST 0
103: #endif /* DIRECTED_BROADCAST */
104: #endif /* IPDIRECTEDBCAST */
1.1 cgd 105: int ipforwarding = IPFORWARDING;
106: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 107: int ip_defttl = IPDEFTTL;
1.26 thorpej 108: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 109: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 110: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 111: int ip_mtudisc = IPMTUDISC;
1.53.2.1! mycroft 112: u_int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 113: #ifdef DIAGNOSTIC
114: int ipprintfs = 0;
115: #endif
116:
1.53.2.1! mycroft 117: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
! 118:
1.1 cgd 119: extern struct domain inetdomain;
120: extern struct protosw inetsw[];
121: u_char ip_protox[IPPROTO_MAX];
122: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 123: struct in_ifaddrhead in_ifaddr;
1.13 mycroft 124: struct ifqueue ipintrq;
1.1 cgd 125:
126: /*
127: * We need to save the IP options in case a protocol wants to respond
128: * to an incoming packet over the same route if the packet got here
129: * using IP source routing. This allows connection establishment and
130: * maintenance when the remote end is on a network that is not known
131: * to us.
132: */
133: int ip_nhops = 0;
134: static struct ip_srcrt {
135: struct in_addr dst; /* final destination */
136: char nop; /* one NOP to align */
137: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
138: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
139: } ip_srcrt;
140:
1.13 mycroft 141: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 142:
1.1 cgd 143: /*
144: * IP initialization: fill in IP protocol switch table.
145: * All protocols not implemented in kernel go to raw IP protocol handler.
146: */
1.8 mycroft 147: void
1.1 cgd 148: ip_init()
149: {
150: register struct protosw *pr;
151: register int i;
152:
153: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
154: if (pr == 0)
155: panic("ip_init");
156: for (i = 0; i < IPPROTO_MAX; i++)
157: ip_protox[i] = pr - inetsw;
158: for (pr = inetdomain.dom_protosw;
159: pr < inetdomain.dom_protoswNPROTOSW; pr++)
160: if (pr->pr_domain->dom_family == PF_INET &&
161: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
162: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 163: LIST_INIT(&ipq);
1.1 cgd 164: ip_id = time.tv_sec & 0xffff;
165: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 166: TAILQ_INIT(&in_ifaddr);
1.53.2.1! mycroft 167:
! 168: if (ip_mtudisc != 0)
! 169: ip_mtudisc_timeout_q =
! 170: rt_timer_queue_create(ip_mtudisc_timeout);
1.1 cgd 171: }
172:
173: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
174: struct route ipforward_rt;
175:
176: /*
177: * Ip input routine. Checksum and byte swap header. If fragmented
178: * try to reassemble. Process options. Pass to next level.
179: */
1.8 mycroft 180: void
1.1 cgd 181: ipintr()
182: {
1.33 mrg 183: register struct ip *ip = NULL;
1.1 cgd 184: register struct mbuf *m;
185: register struct ipq *fp;
186: register struct in_ifaddr *ia;
1.25 cgd 187: struct ipqent *ipqe;
1.35 mycroft 188: int hlen = 0, mff, len, s;
1.36 mrg 189: #ifdef PFIL_HOOKS
1.33 mrg 190: struct packet_filter_hook *pfh;
191: struct mbuf *m0;
1.43 mrg 192: int rv;
1.36 mrg 193: #endif /* PFIL_HOOKS */
1.1 cgd 194:
195: next:
196: /*
197: * Get next datagram off input queue and get IP header
198: * in first mbuf.
199: */
200: s = splimp();
201: IF_DEQUEUE(&ipintrq, m);
202: splx(s);
1.13 mycroft 203: if (m == 0)
1.1 cgd 204: return;
205: #ifdef DIAGNOSTIC
206: if ((m->m_flags & M_PKTHDR) == 0)
207: panic("ipintr no HDR");
208: #endif
209: /*
210: * If no IP addresses have been set yet but the interfaces
211: * are receiving, can't do anything with incoming packets yet.
212: */
1.22 mycroft 213: if (in_ifaddr.tqh_first == 0)
1.1 cgd 214: goto bad;
215: ipstat.ips_total++;
216: if (m->m_len < sizeof (struct ip) &&
217: (m = m_pullup(m, sizeof (struct ip))) == 0) {
218: ipstat.ips_toosmall++;
219: goto next;
220: }
221: ip = mtod(m, struct ip *);
1.13 mycroft 222: if (ip->ip_v != IPVERSION) {
223: ipstat.ips_badvers++;
224: goto bad;
225: }
1.1 cgd 226: hlen = ip->ip_hl << 2;
227: if (hlen < sizeof(struct ip)) { /* minimum header length */
228: ipstat.ips_badhlen++;
229: goto bad;
230: }
231: if (hlen > m->m_len) {
232: if ((m = m_pullup(m, hlen)) == 0) {
233: ipstat.ips_badhlen++;
234: goto next;
235: }
236: ip = mtod(m, struct ip *);
237: }
1.28 christos 238: if ((ip->ip_sum = in_cksum(m, hlen)) != 0) {
1.1 cgd 239: ipstat.ips_badsum++;
240: goto bad;
241: }
242:
243: /*
244: * Convert fields to host representation.
245: */
246: NTOHS(ip->ip_len);
247: NTOHS(ip->ip_id);
248: NTOHS(ip->ip_off);
1.35 mycroft 249: len = ip->ip_len;
1.1 cgd 250:
251: /*
252: * Check that the amount of data in the buffers
253: * is as at least much as the IP header would have us expect.
254: * Trim mbufs if longer than we expect.
255: * Drop packet if shorter than we expect.
256: */
1.35 mycroft 257: if (m->m_pkthdr.len < len) {
1.1 cgd 258: ipstat.ips_tooshort++;
259: goto bad;
260: }
1.35 mycroft 261: if (m->m_pkthdr.len > len) {
1.1 cgd 262: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 263: m->m_len = len;
264: m->m_pkthdr.len = len;
1.1 cgd 265: } else
1.35 mycroft 266: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 267: }
268:
1.36 mrg 269: #ifdef PFIL_HOOKS
1.33 mrg 270: /*
271: * Run through list of hooks for input packets.
272: */
273: m0 = m;
274: for (pfh = pfil_hook_get(PFIL_IN); pfh; pfh = pfh->pfil_link.le_next)
275: if (pfh->pfil_func) {
1.43 mrg 276: rv = pfh->pfil_func(ip, hlen, m->m_pkthdr.rcvif, 0, &m0);
277: if (rv)
1.40 veego 278: goto next;
1.49 christos 279: ip = mtod(m = m0, struct ip *);
1.33 mrg 280: }
1.36 mrg 281: #endif /* PFIL_HOOKS */
1.33 mrg 282:
1.1 cgd 283: /*
284: * Process options and, if not destined for us,
285: * ship it on. ip_dooptions returns 1 when an
286: * error was detected (causing an icmp message
287: * to be sent and the original packet to be freed).
288: */
289: ip_nhops = 0; /* for source routed packets */
290: if (hlen > sizeof (struct ip) && ip_dooptions(m))
291: goto next;
292:
293: /*
294: * Check our list of addresses, to see if the packet is for us.
295: */
1.22 mycroft 296: for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next) {
1.35 mycroft 297: if (in_hosteq(ip->ip_dst, ia->ia_addr.sin_addr))
1.1 cgd 298: goto ours;
1.27 thorpej 299: if (((ip_directedbcast == 0) || (ip_directedbcast &&
300: ia->ia_ifp == m->m_pkthdr.rcvif)) &&
1.1 cgd 301: (ia->ia_ifp->if_flags & IFF_BROADCAST)) {
1.35 mycroft 302: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
303: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 304: /*
305: * Look for all-0's host part (old broadcast addr),
306: * either for subnet or net.
307: */
308: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 309: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 310: goto ours;
311: }
1.51 gwr 312: /*
313: * An interface with IP address zero accepts
314: * all packets that arrive on that interface.
315: */
316: if ((ia->ia_ifp == m->m_pkthdr.rcvif) &&
317: in_nullhost(ia->ia_addr.sin_addr))
318: goto ours;
1.1 cgd 319: }
1.18 mycroft 320: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 321: struct in_multi *inm;
322: #ifdef MROUTING
323: extern struct socket *ip_mrouter;
1.10 brezak 324:
325: if (m->m_flags & M_EXT) {
326: if ((m = m_pullup(m, hlen)) == 0) {
327: ipstat.ips_toosmall++;
328: goto next;
329: }
330: ip = mtod(m, struct ip *);
331: }
1.4 hpeyerl 332:
333: if (ip_mrouter) {
334: /*
335: * If we are acting as a multicast router, all
336: * incoming multicast packets are passed to the
337: * kernel-level multicast forwarding function.
338: * The packet is returned (relatively) intact; if
339: * ip_mforward() returns a non-zero value, the packet
340: * must be discarded, else it may be accepted below.
341: *
342: * (The IP ident field is put in the same byte order
343: * as expected when ip_mforward() is called from
344: * ip_output().)
345: */
346: ip->ip_id = htons(ip->ip_id);
1.13 mycroft 347: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
348: ipstat.ips_cantforward++;
1.4 hpeyerl 349: m_freem(m);
350: goto next;
351: }
352: ip->ip_id = ntohs(ip->ip_id);
353:
354: /*
355: * The process-level routing demon needs to receive
356: * all multicast IGMP packets, whether or not this
357: * host belongs to their destination groups.
358: */
359: if (ip->ip_p == IPPROTO_IGMP)
360: goto ours;
1.13 mycroft 361: ipstat.ips_forward++;
1.4 hpeyerl 362: }
363: #endif
364: /*
365: * See if we belong to the destination multicast group on the
366: * arrival interface.
367: */
368: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
369: if (inm == NULL) {
1.13 mycroft 370: ipstat.ips_cantforward++;
1.4 hpeyerl 371: m_freem(m);
372: goto next;
373: }
374: goto ours;
375: }
1.19 mycroft 376: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 377: in_nullhost(ip->ip_dst))
1.1 cgd 378: goto ours;
379:
380: /*
381: * Not for us; forward if possible and desirable.
382: */
383: if (ipforwarding == 0) {
384: ipstat.ips_cantforward++;
385: m_freem(m);
386: } else
387: ip_forward(m, 0);
388: goto next;
389:
390: ours:
391: /*
392: * If offset or IP_MF are set, must reassemble.
393: * Otherwise, nothing need be done.
394: * (We could look in the reassembly queue to see
395: * if the packet was previously fragmented,
396: * but it's not worth the time; just let them time out.)
397: */
1.37 perry 398: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 399: /*
400: * Look for queue of fragments
401: * of this datagram.
402: */
1.25 cgd 403: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 404: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 405: in_hosteq(ip->ip_src, fp->ipq_src) &&
406: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 407: ip->ip_p == fp->ipq_p)
408: goto found;
409: fp = 0;
410: found:
411:
412: /*
413: * Adjust ip_len to not reflect header,
1.25 cgd 414: * set ipqe_mff if more fragments are expected,
1.1 cgd 415: * convert offset of this to bytes.
416: */
417: ip->ip_len -= hlen;
1.25 cgd 418: mff = (ip->ip_off & IP_MF) != 0;
419: if (mff) {
1.16 cgd 420: /*
421: * Make sure that fragments have a data length
422: * that's a non-zero multiple of 8 bytes.
423: */
1.17 cgd 424: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 425: ipstat.ips_badfrags++;
426: goto bad;
427: }
428: }
1.1 cgd 429: ip->ip_off <<= 3;
430:
431: /*
432: * If datagram marked as having more fragments
433: * or if this is not the first fragment,
434: * attempt reassembly; if it succeeds, proceed.
435: */
1.25 cgd 436: if (mff || ip->ip_off) {
1.1 cgd 437: ipstat.ips_fragments++;
1.25 cgd 438: MALLOC(ipqe, struct ipqent *, sizeof (struct ipqent),
439: M_IPQ, M_NOWAIT);
440: if (ipqe == NULL) {
441: ipstat.ips_rcvmemdrop++;
442: goto bad;
443: }
444: ipqe->ipqe_mff = mff;
1.50 thorpej 445: ipqe->ipqe_m = m;
1.25 cgd 446: ipqe->ipqe_ip = ip;
1.50 thorpej 447: m = ip_reass(ipqe, fp);
448: if (m == 0)
1.1 cgd 449: goto next;
1.13 mycroft 450: ipstat.ips_reassembled++;
1.50 thorpej 451: ip = mtod(m, struct ip *);
1.1 cgd 452: } else
453: if (fp)
454: ip_freef(fp);
455: } else
456: ip->ip_len -= hlen;
457:
458: /*
459: * Switch out to protocol's input routine.
460: */
461: ipstat.ips_delivered++;
462: (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
463: goto next;
464: bad:
465: m_freem(m);
466: goto next;
467: }
468:
469: /*
470: * Take incoming datagram fragment and try to
471: * reassemble it into whole datagram. If a chain for
472: * reassembly of this datagram already exists, then it
473: * is given as fp; otherwise have to make a chain.
474: */
1.50 thorpej 475: struct mbuf *
1.25 cgd 476: ip_reass(ipqe, fp)
477: register struct ipqent *ipqe;
1.1 cgd 478: register struct ipq *fp;
479: {
1.50 thorpej 480: register struct mbuf *m = ipqe->ipqe_m;
1.25 cgd 481: register struct ipqent *nq, *p, *q;
482: struct ip *ip;
1.1 cgd 483: struct mbuf *t;
1.25 cgd 484: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 485: int i, next;
486:
487: /*
488: * Presence of header sizes in mbufs
489: * would confuse code below.
490: */
491: m->m_data += hlen;
492: m->m_len -= hlen;
493:
494: /*
495: * If first fragment to arrive, create a reassembly queue.
496: */
497: if (fp == 0) {
1.50 thorpej 498: MALLOC(fp, struct ipq *, sizeof (struct ipq),
499: M_FTABLE, M_NOWAIT);
500: if (fp == NULL)
1.1 cgd 501: goto dropfrag;
1.25 cgd 502: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 503: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 504: fp->ipq_p = ipqe->ipqe_ip->ip_p;
505: fp->ipq_id = ipqe->ipqe_ip->ip_id;
506: LIST_INIT(&fp->ipq_fragq);
507: fp->ipq_src = ipqe->ipqe_ip->ip_src;
508: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
509: p = NULL;
1.1 cgd 510: goto insert;
511: }
512:
513: /*
514: * Find a segment which begins after this one does.
515: */
1.25 cgd 516: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
517: p = q, q = q->ipqe_q.le_next)
518: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 519: break;
520:
521: /*
522: * If there is a preceding segment, it may provide some of
523: * our data already. If so, drop the data from the incoming
524: * segment. If it provides all of our data, drop us.
525: */
1.25 cgd 526: if (p != NULL) {
527: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
528: ipqe->ipqe_ip->ip_off;
1.1 cgd 529: if (i > 0) {
1.25 cgd 530: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 531: goto dropfrag;
1.50 thorpej 532: m_adj(ipqe->ipqe_m, i);
1.25 cgd 533: ipqe->ipqe_ip->ip_off += i;
534: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 535: }
536: }
537:
538: /*
539: * While we overlap succeeding segments trim them or,
540: * if they are completely covered, dequeue them.
541: */
1.25 cgd 542: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
543: q->ipqe_ip->ip_off; q = nq) {
544: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
545: q->ipqe_ip->ip_off;
546: if (i < q->ipqe_ip->ip_len) {
547: q->ipqe_ip->ip_len -= i;
548: q->ipqe_ip->ip_off += i;
1.50 thorpej 549: m_adj(q->ipqe_m, i);
1.1 cgd 550: break;
551: }
1.25 cgd 552: nq = q->ipqe_q.le_next;
1.50 thorpej 553: m_freem(q->ipqe_m);
1.25 cgd 554: LIST_REMOVE(q, ipqe_q);
555: FREE(q, M_IPQ);
1.1 cgd 556: }
557:
558: insert:
559: /*
560: * Stick new segment in its place;
561: * check for complete reassembly.
562: */
1.25 cgd 563: if (p == NULL) {
564: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
565: } else {
566: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
567: }
1.1 cgd 568: next = 0;
1.25 cgd 569: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
570: p = q, q = q->ipqe_q.le_next) {
571: if (q->ipqe_ip->ip_off != next)
1.1 cgd 572: return (0);
1.25 cgd 573: next += q->ipqe_ip->ip_len;
1.1 cgd 574: }
1.25 cgd 575: if (p->ipqe_mff)
1.1 cgd 576: return (0);
577:
578: /*
1.41 thorpej 579: * Reassembly is complete. Check for a bogus message size and
580: * concatenate fragments.
1.1 cgd 581: */
1.25 cgd 582: q = fp->ipq_fragq.lh_first;
583: ip = q->ipqe_ip;
1.41 thorpej 584: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
585: ipstat.ips_toolong++;
586: ip_freef(fp);
587: return (0);
588: }
1.50 thorpej 589: m = q->ipqe_m;
1.1 cgd 590: t = m->m_next;
591: m->m_next = 0;
592: m_cat(m, t);
1.25 cgd 593: nq = q->ipqe_q.le_next;
594: FREE(q, M_IPQ);
595: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 596: t = q->ipqe_m;
1.25 cgd 597: nq = q->ipqe_q.le_next;
598: FREE(q, M_IPQ);
1.1 cgd 599: m_cat(m, t);
600: }
601:
602: /*
603: * Create header for new ip packet by
604: * modifying header of first packet;
605: * dequeue and discard fragment reassembly header.
606: * Make header visible.
607: */
608: ip->ip_len = next;
1.25 cgd 609: ip->ip_src = fp->ipq_src;
610: ip->ip_dst = fp->ipq_dst;
611: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 612: FREE(fp, M_FTABLE);
1.1 cgd 613: m->m_len += (ip->ip_hl << 2);
614: m->m_data -= (ip->ip_hl << 2);
615: /* some debugging cruft by sklower, below, will go away soon */
616: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
617: register int plen = 0;
1.50 thorpej 618: for (t = m; t; t = t->m_next)
619: plen += t->m_len;
620: m->m_pkthdr.len = plen;
1.1 cgd 621: }
1.50 thorpej 622: return (m);
1.1 cgd 623:
624: dropfrag:
625: ipstat.ips_fragdropped++;
626: m_freem(m);
1.25 cgd 627: FREE(ipqe, M_IPQ);
1.1 cgd 628: return (0);
629: }
630:
631: /*
632: * Free a fragment reassembly header and all
633: * associated datagrams.
634: */
1.8 mycroft 635: void
1.1 cgd 636: ip_freef(fp)
637: struct ipq *fp;
638: {
1.25 cgd 639: register struct ipqent *q, *p;
1.1 cgd 640:
1.25 cgd 641: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
642: p = q->ipqe_q.le_next;
1.50 thorpej 643: m_freem(q->ipqe_m);
1.25 cgd 644: LIST_REMOVE(q, ipqe_q);
645: FREE(q, M_IPQ);
1.1 cgd 646: }
1.25 cgd 647: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 648: FREE(fp, M_FTABLE);
1.1 cgd 649: }
650:
651: /*
652: * IP timer processing;
653: * if a timer expires on a reassembly
654: * queue, discard it.
655: */
1.8 mycroft 656: void
1.1 cgd 657: ip_slowtimo()
658: {
1.25 cgd 659: register struct ipq *fp, *nfp;
1.24 mycroft 660: int s = splsoftnet();
1.1 cgd 661:
1.25 cgd 662: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
663: nfp = fp->ipq_q.le_next;
664: if (--fp->ipq_ttl == 0) {
1.1 cgd 665: ipstat.ips_fragtimeout++;
1.25 cgd 666: ip_freef(fp);
1.1 cgd 667: }
668: }
669: splx(s);
670: }
671:
672: /*
673: * Drain off all datagram fragments.
674: */
1.8 mycroft 675: void
1.1 cgd 676: ip_drain()
677: {
678:
1.25 cgd 679: while (ipq.lh_first != NULL) {
1.1 cgd 680: ipstat.ips_fragdropped++;
1.25 cgd 681: ip_freef(ipq.lh_first);
1.1 cgd 682: }
683: }
684:
685: /*
686: * Do option processing on a datagram,
687: * possibly discarding it if bad options are encountered,
688: * or forwarding it if source-routed.
689: * Returns 1 if packet has been forwarded/freed,
690: * 0 if the packet should be processed further.
691: */
1.8 mycroft 692: int
1.1 cgd 693: ip_dooptions(m)
694: struct mbuf *m;
695: {
696: register struct ip *ip = mtod(m, struct ip *);
697: register u_char *cp;
698: register struct ip_timestamp *ipt;
699: register struct in_ifaddr *ia;
700: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.13 mycroft 701: struct in_addr *sin, dst;
1.1 cgd 702: n_time ntime;
703:
1.13 mycroft 704: dst = ip->ip_dst;
1.1 cgd 705: cp = (u_char *)(ip + 1);
706: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
707: for (; cnt > 0; cnt -= optlen, cp += optlen) {
708: opt = cp[IPOPT_OPTVAL];
709: if (opt == IPOPT_EOL)
710: break;
711: if (opt == IPOPT_NOP)
712: optlen = 1;
713: else {
714: optlen = cp[IPOPT_OLEN];
715: if (optlen <= 0 || optlen > cnt) {
716: code = &cp[IPOPT_OLEN] - (u_char *)ip;
717: goto bad;
718: }
719: }
720: switch (opt) {
721:
722: default:
723: break;
724:
725: /*
726: * Source routing with record.
727: * Find interface with current destination address.
728: * If none on this machine then drop if strictly routed,
729: * or do nothing if loosely routed.
730: * Record interface address and bring up next address
731: * component. If strictly routed make sure next
732: * address is on directly accessible net.
733: */
734: case IPOPT_LSRR:
735: case IPOPT_SSRR:
1.47 cjs 736: if (ip_allowsrcrt == 0) {
737: type = ICMP_UNREACH;
738: code = ICMP_UNREACH_NET_PROHIB;
739: goto bad;
740: }
1.1 cgd 741: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
742: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
743: goto bad;
744: }
745: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 746: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 747: if (ia == 0) {
748: if (opt == IPOPT_SSRR) {
749: type = ICMP_UNREACH;
750: code = ICMP_UNREACH_SRCFAIL;
751: goto bad;
752: }
753: /*
754: * Loose routing, and not at next destination
755: * yet; nothing to do except forward.
756: */
757: break;
758: }
759: off--; /* 0 origin */
760: if (off > optlen - sizeof(struct in_addr)) {
761: /*
762: * End of source route. Should be for us.
763: */
764: save_rte(cp, ip->ip_src);
765: break;
766: }
767: /*
768: * locate outgoing interface
769: */
770: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
771: sizeof(ipaddr.sin_addr));
772: if (opt == IPOPT_SSRR) {
773: #define INA struct in_ifaddr *
774: #define SA struct sockaddr *
1.29 mrg 775: ia = (INA)ifa_ifwithladdr((SA)&ipaddr);
1.1 cgd 776: } else
777: ia = ip_rtaddr(ipaddr.sin_addr);
778: if (ia == 0) {
779: type = ICMP_UNREACH;
780: code = ICMP_UNREACH_SRCFAIL;
781: goto bad;
782: }
783: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 784: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 785: (caddr_t)(cp + off), sizeof(struct in_addr));
786: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 787: /*
788: * Let ip_intr's mcast routing check handle mcast pkts
789: */
1.18 mycroft 790: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 791: break;
792:
793: case IPOPT_RR:
794: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
795: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
796: goto bad;
797: }
798: /*
799: * If no space remains, ignore.
800: */
801: off--; /* 0 origin */
802: if (off > optlen - sizeof(struct in_addr))
803: break;
804: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
805: sizeof(ipaddr.sin_addr));
806: /*
807: * locate outgoing interface; if we're the destination,
808: * use the incoming interface (should be same).
809: */
810: if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == 0 &&
811: (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) {
812: type = ICMP_UNREACH;
813: code = ICMP_UNREACH_HOST;
814: goto bad;
815: }
1.20 mycroft 816: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 817: (caddr_t)(cp + off), sizeof(struct in_addr));
818: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
819: break;
820:
821: case IPOPT_TS:
822: code = cp - (u_char *)ip;
823: ipt = (struct ip_timestamp *)cp;
824: if (ipt->ipt_len < 5)
825: goto bad;
1.15 cgd 826: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.1 cgd 827: if (++ipt->ipt_oflw == 0)
828: goto bad;
829: break;
830: }
831: sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1);
832: switch (ipt->ipt_flg) {
833:
834: case IPOPT_TS_TSONLY:
835: break;
836:
837: case IPOPT_TS_TSANDADDR:
838: if (ipt->ipt_ptr + sizeof(n_time) +
839: sizeof(struct in_addr) > ipt->ipt_len)
840: goto bad;
1.13 mycroft 841: ipaddr.sin_addr = dst;
842: ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
843: m->m_pkthdr.rcvif);
844: if (ia == 0)
845: continue;
1.20 mycroft 846: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 847: (caddr_t)sin, sizeof(struct in_addr));
848: ipt->ipt_ptr += sizeof(struct in_addr);
849: break;
850:
851: case IPOPT_TS_PRESPEC:
852: if (ipt->ipt_ptr + sizeof(n_time) +
853: sizeof(struct in_addr) > ipt->ipt_len)
854: goto bad;
855: bcopy((caddr_t)sin, (caddr_t)&ipaddr.sin_addr,
856: sizeof(struct in_addr));
857: if (ifa_ifwithaddr((SA)&ipaddr) == 0)
858: continue;
859: ipt->ipt_ptr += sizeof(struct in_addr);
860: break;
861:
862: default:
863: goto bad;
864: }
865: ntime = iptime();
866: bcopy((caddr_t)&ntime, (caddr_t)cp + ipt->ipt_ptr - 1,
867: sizeof(n_time));
868: ipt->ipt_ptr += sizeof(n_time);
869: }
870: }
871: if (forward) {
1.26 thorpej 872: if (ip_forwsrcrt == 0) {
873: type = ICMP_UNREACH;
874: code = ICMP_UNREACH_SRCFAIL;
875: goto bad;
876: }
1.1 cgd 877: ip_forward(m, 1);
878: return (1);
1.13 mycroft 879: }
880: return (0);
1.1 cgd 881: bad:
1.13 mycroft 882: ip->ip_len -= ip->ip_hl << 2; /* XXX icmp_error adds in hdr length */
883: icmp_error(m, type, code, 0, 0);
884: ipstat.ips_badoptions++;
1.1 cgd 885: return (1);
886: }
887:
888: /*
889: * Given address of next destination (final or next hop),
890: * return internet address info of interface to be used to get there.
891: */
892: struct in_ifaddr *
893: ip_rtaddr(dst)
894: struct in_addr dst;
895: {
896: register struct sockaddr_in *sin;
897:
1.19 mycroft 898: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 899:
1.35 mycroft 900: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 901: if (ipforward_rt.ro_rt) {
902: RTFREE(ipforward_rt.ro_rt);
903: ipforward_rt.ro_rt = 0;
904: }
905: sin->sin_family = AF_INET;
906: sin->sin_len = sizeof(*sin);
907: sin->sin_addr = dst;
908:
909: rtalloc(&ipforward_rt);
910: }
911: if (ipforward_rt.ro_rt == 0)
912: return ((struct in_ifaddr *)0);
1.19 mycroft 913: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 914: }
915:
916: /*
917: * Save incoming source route for use in replies,
918: * to be picked up later by ip_srcroute if the receiver is interested.
919: */
1.13 mycroft 920: void
1.1 cgd 921: save_rte(option, dst)
922: u_char *option;
923: struct in_addr dst;
924: {
925: unsigned olen;
926:
927: olen = option[IPOPT_OLEN];
928: #ifdef DIAGNOSTIC
929: if (ipprintfs)
1.39 christos 930: printf("save_rte: olen %d\n", olen);
1.1 cgd 931: #endif
932: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
933: return;
934: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
935: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
936: ip_srcrt.dst = dst;
937: }
938:
939: /*
940: * Retrieve incoming source route for use in replies,
941: * in the same form used by setsockopt.
942: * The first hop is placed before the options, will be removed later.
943: */
944: struct mbuf *
945: ip_srcroute()
946: {
947: register struct in_addr *p, *q;
948: register struct mbuf *m;
949:
950: if (ip_nhops == 0)
951: return ((struct mbuf *)0);
952: m = m_get(M_DONTWAIT, MT_SOOPTS);
953: if (m == 0)
954: return ((struct mbuf *)0);
955:
1.13 mycroft 956: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 957:
958: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
959: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
960: OPTSIZ;
961: #ifdef DIAGNOSTIC
962: if (ipprintfs)
1.39 christos 963: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 964: #endif
965:
966: /*
967: * First save first hop for return route
968: */
969: p = &ip_srcrt.route[ip_nhops - 1];
970: *(mtod(m, struct in_addr *)) = *p--;
971: #ifdef DIAGNOSTIC
972: if (ipprintfs)
1.39 christos 973: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 974: #endif
975:
976: /*
977: * Copy option fields and padding (nop) to mbuf.
978: */
979: ip_srcrt.nop = IPOPT_NOP;
980: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
981: bcopy((caddr_t)&ip_srcrt.nop,
982: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
983: q = (struct in_addr *)(mtod(m, caddr_t) +
984: sizeof(struct in_addr) + OPTSIZ);
985: #undef OPTSIZ
986: /*
987: * Record return path as an IP source route,
988: * reversing the path (pointers are now aligned).
989: */
990: while (p >= ip_srcrt.route) {
991: #ifdef DIAGNOSTIC
992: if (ipprintfs)
1.39 christos 993: printf(" %x", ntohl(q->s_addr));
1.1 cgd 994: #endif
995: *q++ = *p--;
996: }
997: /*
998: * Last hop goes to final destination.
999: */
1000: *q = ip_srcrt.dst;
1001: #ifdef DIAGNOSTIC
1002: if (ipprintfs)
1.39 christos 1003: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1004: #endif
1005: return (m);
1006: }
1007:
1008: /*
1009: * Strip out IP options, at higher
1010: * level protocol in the kernel.
1011: * Second argument is buffer to which options
1012: * will be moved, and return value is their length.
1013: * XXX should be deleted; last arg currently ignored.
1014: */
1.8 mycroft 1015: void
1.1 cgd 1016: ip_stripoptions(m, mopt)
1017: register struct mbuf *m;
1018: struct mbuf *mopt;
1019: {
1020: register int i;
1021: struct ip *ip = mtod(m, struct ip *);
1022: register caddr_t opts;
1023: int olen;
1024:
1025: olen = (ip->ip_hl<<2) - sizeof (struct ip);
1026: opts = (caddr_t)(ip + 1);
1027: i = m->m_len - (sizeof (struct ip) + olen);
1028: bcopy(opts + olen, opts, (unsigned)i);
1029: m->m_len -= olen;
1030: if (m->m_flags & M_PKTHDR)
1031: m->m_pkthdr.len -= olen;
1032: ip->ip_hl = sizeof(struct ip) >> 2;
1033: }
1034:
1.23 mycroft 1035: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1036: 0, 0, 0, 0,
1037: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1038: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1039: EMSGSIZE, EHOSTUNREACH, 0, 0,
1040: 0, 0, 0, 0,
1041: ENOPROTOOPT
1042: };
1043:
1044: /*
1045: * Forward a packet. If some error occurs return the sender
1046: * an icmp packet. Note we can't always generate a meaningful
1047: * icmp message because icmp doesn't have a large enough repertoire
1048: * of codes and types.
1049: *
1050: * If not forwarding, just drop the packet. This could be confusing
1051: * if ipforwarding was zero but some routing protocol was advancing
1052: * us as a gateway to somewhere. However, we must let the routing
1053: * protocol deal with that.
1054: *
1055: * The srcrt parameter indicates whether the packet is being forwarded
1056: * via a source route.
1057: */
1.13 mycroft 1058: void
1.1 cgd 1059: ip_forward(m, srcrt)
1060: struct mbuf *m;
1061: int srcrt;
1062: {
1063: register struct ip *ip = mtod(m, struct ip *);
1064: register struct sockaddr_in *sin;
1065: register struct rtentry *rt;
1.28 christos 1066: int error, type = 0, code = 0;
1.1 cgd 1067: struct mbuf *mcopy;
1.13 mycroft 1068: n_long dest;
1069: struct ifnet *destifp;
1.1 cgd 1070:
1.13 mycroft 1071: dest = 0;
1.1 cgd 1072: #ifdef DIAGNOSTIC
1073: if (ipprintfs)
1.39 christos 1074: printf("forward: src %x dst %x ttl %x\n",
1.35 mycroft 1075: ip->ip_src.s_addr, ip->ip_dst.s_addr, ip->ip_ttl);
1.1 cgd 1076: #endif
1077: if (m->m_flags & M_BCAST || in_canforward(ip->ip_dst) == 0) {
1078: ipstat.ips_cantforward++;
1079: m_freem(m);
1080: return;
1081: }
1082: HTONS(ip->ip_id);
1083: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1084: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1085: return;
1086: }
1087: ip->ip_ttl -= IPTTLDEC;
1088:
1.19 mycroft 1089: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1090: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1091: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1092: if (ipforward_rt.ro_rt) {
1093: RTFREE(ipforward_rt.ro_rt);
1094: ipforward_rt.ro_rt = 0;
1095: }
1096: sin->sin_family = AF_INET;
1.35 mycroft 1097: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1098: sin->sin_addr = ip->ip_dst;
1099:
1100: rtalloc(&ipforward_rt);
1101: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1102: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1103: return;
1104: }
1105: rt = ipforward_rt.ro_rt;
1106: }
1107:
1108: /*
1.34 mycroft 1109: * Save at most 68 bytes of the packet in case
1.1 cgd 1110: * we need to generate an ICMP message to the src.
1111: */
1.34 mycroft 1112: mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1 cgd 1113:
1114: /*
1115: * If forwarding packet using same interface that it came in on,
1116: * perhaps should send a redirect to sender to shortcut a hop.
1117: * Only send redirect if source is sending directly to us,
1118: * and if packet was not source routed (or has any options).
1119: * Also, don't send redirect if forwarding using a default route
1120: * or a route modified by a redirect.
1121: */
1122: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1123: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1124: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1125: ipsendredirects && !srcrt) {
1.19 mycroft 1126: if (rt->rt_ifa &&
1127: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1128: ifatoia(rt->rt_ifa)->ia_subnet) {
1.1 cgd 1129: if (rt->rt_flags & RTF_GATEWAY)
1.13 mycroft 1130: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1.1 cgd 1131: else
1.13 mycroft 1132: dest = ip->ip_dst.s_addr;
1133: /* Router requirements says to only send host redirects */
1.1 cgd 1134: type = ICMP_REDIRECT;
1.13 mycroft 1135: code = ICMP_REDIRECT_HOST;
1.1 cgd 1136: #ifdef DIAGNOSTIC
1137: if (ipprintfs)
1.39 christos 1138: printf("redirect (%d) to %x\n", code, (u_int32_t)dest);
1.1 cgd 1139: #endif
1140: }
1141: }
1142:
1.27 thorpej 1143: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1144: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1145: if (error)
1146: ipstat.ips_cantforward++;
1147: else {
1148: ipstat.ips_forward++;
1149: if (type)
1150: ipstat.ips_redirectsent++;
1151: else {
1152: if (mcopy)
1153: m_freem(mcopy);
1154: return;
1155: }
1156: }
1157: if (mcopy == NULL)
1158: return;
1.13 mycroft 1159: destifp = NULL;
1160:
1.1 cgd 1161: switch (error) {
1162:
1163: case 0: /* forwarded, but need redirect */
1164: /* type, code set above */
1165: break;
1166:
1167: case ENETUNREACH: /* shouldn't happen, checked above */
1168: case EHOSTUNREACH:
1169: case ENETDOWN:
1170: case EHOSTDOWN:
1171: default:
1172: type = ICMP_UNREACH;
1173: code = ICMP_UNREACH_HOST;
1174: break;
1175:
1176: case EMSGSIZE:
1177: type = ICMP_UNREACH;
1178: code = ICMP_UNREACH_NEEDFRAG;
1.13 mycroft 1179: if (ipforward_rt.ro_rt)
1180: destifp = ipforward_rt.ro_rt->rt_ifp;
1.1 cgd 1181: ipstat.ips_cantfrag++;
1182: break;
1183:
1184: case ENOBUFS:
1185: type = ICMP_SOURCEQUENCH;
1186: code = 0;
1187: break;
1188: }
1.13 mycroft 1189: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1190: }
1191:
1192: void
1193: ip_savecontrol(inp, mp, ip, m)
1194: register struct inpcb *inp;
1195: register struct mbuf **mp;
1196: register struct ip *ip;
1197: register struct mbuf *m;
1198: {
1199:
1200: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1201: struct timeval tv;
1202:
1203: microtime(&tv);
1204: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1205: SCM_TIMESTAMP, SOL_SOCKET);
1206: if (*mp)
1207: mp = &(*mp)->m_next;
1208: }
1209: if (inp->inp_flags & INP_RECVDSTADDR) {
1210: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1211: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1212: if (*mp)
1213: mp = &(*mp)->m_next;
1214: }
1215: #ifdef notyet
1216: /*
1217: * XXX
1218: * Moving these out of udp_input() made them even more broken
1219: * than they already were.
1220: * - fenner@parc.xerox.com
1221: */
1222: /* options were tossed already */
1223: if (inp->inp_flags & INP_RECVOPTS) {
1224: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1225: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1226: if (*mp)
1227: mp = &(*mp)->m_next;
1228: }
1229: /* ip_srcroute doesn't do what we want here, need to fix */
1230: if (inp->inp_flags & INP_RECVRETOPTS) {
1231: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1232: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1233: if (*mp)
1234: mp = &(*mp)->m_next;
1235: }
1236: #endif
1237: if (inp->inp_flags & INP_RECVIF) {
1238: struct sockaddr_dl sdl;
1239:
1240: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1241: sdl.sdl_family = AF_LINK;
1242: sdl.sdl_index = m->m_pkthdr.rcvif ?
1243: m->m_pkthdr.rcvif->if_index : 0;
1244: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1245: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1246: IP_RECVIF, IPPROTO_IP);
1247: if (*mp)
1248: mp = &(*mp)->m_next;
1249: }
1.13 mycroft 1250: }
1251:
1252: int
1253: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1254: int *name;
1255: u_int namelen;
1256: void *oldp;
1257: size_t *oldlenp;
1258: void *newp;
1259: size_t newlen;
1260: {
1.52 thorpej 1261: extern int subnetsarelocal;
1.53.2.1! mycroft 1262: int error;
1.52 thorpej 1263:
1.13 mycroft 1264: /* All sysctl names at this level are terminal. */
1265: if (namelen != 1)
1266: return (ENOTDIR);
1267:
1268: switch (name[0]) {
1269: case IPCTL_FORWARDING:
1270: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1271: case IPCTL_SENDREDIRECTS:
1272: return (sysctl_int(oldp, oldlenp, newp, newlen,
1273: &ipsendredirects));
1274: case IPCTL_DEFTTL:
1275: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1276: #ifdef notyet
1277: case IPCTL_DEFMTU:
1278: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1279: #endif
1.26 thorpej 1280: case IPCTL_FORWSRCRT:
1.47 cjs 1281: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1282: if (securelevel > 0)
1.46 cjs 1283: return (sysctl_rdint(oldp, oldlenp, newp,
1284: ip_forwsrcrt));
1285: else
1286: return (sysctl_int(oldp, oldlenp, newp, newlen,
1287: &ip_forwsrcrt));
1.27 thorpej 1288: case IPCTL_DIRECTEDBCAST:
1289: return (sysctl_int(oldp, oldlenp, newp, newlen,
1290: &ip_directedbcast));
1.47 cjs 1291: case IPCTL_ALLOWSRCRT:
1292: return (sysctl_int(oldp, oldlenp, newp, newlen,
1293: &ip_allowsrcrt));
1.52 thorpej 1294: case IPCTL_SUBNETSARELOCAL:
1295: return (sysctl_int(oldp, oldlenp, newp, newlen,
1296: &subnetsarelocal));
1.53 kml 1297: case IPCTL_MTUDISC:
1.53.2.1! mycroft 1298: error = sysctl_int(oldp, oldlenp, newp, newlen,
! 1299: &ip_mtudisc);
! 1300: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
! 1301: ip_mtudisc_timeout_q =
! 1302: rt_timer_queue_create(ip_mtudisc_timeout);
! 1303: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
! 1304: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
! 1305: ip_mtudisc_timeout_q = NULL;
! 1306: }
! 1307: return error;
! 1308: case IPCTL_MTUDISCTIMEOUT:
! 1309: error = sysctl_int(oldp, oldlenp, newp, newlen,
! 1310: &ip_mtudisc_timeout);
! 1311: if (ip_mtudisc_timeout_q != NULL)
! 1312: rt_timer_queue_change(ip_mtudisc_timeout_q,
! 1313: ip_mtudisc_timeout);
! 1314: return (error);
1.13 mycroft 1315: default:
1316: return (EOPNOTSUPP);
1317: }
1318: /* NOTREACHED */
1.1 cgd 1319: }
CVSweb <webmaster@jp.NetBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to ip_input.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [cvs.NetBSD.org] / src / sys / netinet