Annotation of src/sys/netinet/raw_ip.c, Revision 1.42
1.42 ! thorpej 1: /* $NetBSD: raw_ip.c,v 1.41 1998/04/03 07:49:16 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: *
1.39 thorpej 35: * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95
1.1 cgd 36: */
1.40 scottr 37:
38: #include "opt_mrouting.h"
1.1 cgd 39:
1.7 mycroft 40: #include <sys/param.h>
41: #include <sys/malloc.h>
42: #include <sys/mbuf.h>
43: #include <sys/socket.h>
44: #include <sys/protosw.h>
45: #include <sys/socketvar.h>
46: #include <sys/errno.h>
1.13 mycroft 47: #include <sys/systm.h>
1.26 mycroft 48: #include <sys/proc.h>
1.1 cgd 49:
1.7 mycroft 50: #include <net/if.h>
51: #include <net/route.h>
1.1 cgd 52:
1.7 mycroft 53: #include <netinet/in.h>
54: #include <netinet/in_systm.h>
55: #include <netinet/ip.h>
56: #include <netinet/ip_var.h>
1.13 mycroft 57: #include <netinet/ip_mroute.h>
1.7 mycroft 58: #include <netinet/in_pcb.h>
1.24 christos 59: #include <netinet/in_var.h>
60:
61: #include <machine/stdarg.h>
1.13 mycroft 62:
1.20 mycroft 63: struct inpcbtable rawcbtable;
1.30 pk 64:
65: int rip_bind __P((struct inpcb *, struct mbuf *));
66: int rip_connect __P((struct inpcb *, struct mbuf *));
67: void rip_disconnect __P((struct inpcb *));
1.13 mycroft 68:
69: /*
70: * Nominal space allocated to a raw ip socket.
71: */
72: #define RIPSNDQ 8192
73: #define RIPRCVQ 8192
1.1 cgd 74:
75: /*
76: * Raw interface to IP protocol.
77: */
1.13 mycroft 78:
79: /*
80: * Initialize raw connection block q.
81: */
82: void
83: rip_init()
84: {
85:
1.33 mycroft 86: in_pcbinit(&rawcbtable, 1, 1);
1.13 mycroft 87: }
88:
1.1 cgd 89: /*
90: * Setup generic address and protocol structures
91: * for raw_input routine, then pass them along with
92: * mbuf chain.
93: */
1.9 mycroft 94: void
1.24 christos 95: #if __STDC__
96: rip_input(struct mbuf *m, ...)
97: #else
98: rip_input(m, va_alist)
1.1 cgd 99: struct mbuf *m;
1.24 christos 100: va_dcl
101: #endif
1.1 cgd 102: {
103: register struct ip *ip = mtod(m, struct ip *);
1.13 mycroft 104: register struct inpcb *inp;
1.36 thorpej 105: struct inpcb *last = 0;
106: struct mbuf *opts = 0;
1.32 mycroft 107: struct sockaddr_in ripsrc;
1.1 cgd 108:
1.32 mycroft 109: ripsrc.sin_family = AF_INET;
110: ripsrc.sin_len = sizeof(struct sockaddr_in);
1.1 cgd 111: ripsrc.sin_addr = ip->ip_src;
1.34 mycroft 112: ripsrc.sin_port = 0;
113: bzero((caddr_t)ripsrc.sin_zero, sizeof(ripsrc.sin_zero));
1.42 ! thorpej 114:
! 115: /*
! 116: * XXX Compatibility: programs using raw IP expect ip_len
! 117: * XXX to have the header length subtracted.
! 118: */
! 119: ip->ip_len -= ip->ip_hl << 2;
1.32 mycroft 120:
1.21 cgd 121: for (inp = rawcbtable.inpt_queue.cqh_first;
122: inp != (struct inpcb *)&rawcbtable.inpt_queue;
123: inp = inp->inp_queue.cqe_next) {
1.13 mycroft 124: if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
125: continue;
1.32 mycroft 126: if (!in_nullhost(inp->inp_laddr) &&
127: !in_hosteq(inp->inp_laddr, ip->ip_dst))
1.13 mycroft 128: continue;
1.32 mycroft 129: if (!in_nullhost(inp->inp_faddr) &&
130: !in_hosteq(inp->inp_faddr, ip->ip_src))
1.13 mycroft 131: continue;
132: if (last) {
133: struct mbuf *n;
1.24 christos 134: if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1.36 thorpej 135: if (last->inp_flags & INP_CONTROLOPTS ||
136: last->inp_socket->so_options & SO_TIMESTAMP)
137: ip_savecontrol(last, &opts, ip, n);
138: if (sbappendaddr(&last->inp_socket->so_rcv,
139: sintosa(&ripsrc), n, opts) == 0) {
1.13 mycroft 140: /* should notify about lost packet */
141: m_freem(n);
1.36 thorpej 142: if (opts)
143: m_freem(opts);
144: } else
145: sorwakeup(last->inp_socket);
1.41 thorpej 146: opts = NULL;
1.13 mycroft 147: }
148: }
1.36 thorpej 149: last = inp;
1.13 mycroft 150: }
151: if (last) {
1.36 thorpej 152: if (last->inp_flags & INP_CONTROLOPTS ||
153: last->inp_socket->so_options & SO_TIMESTAMP)
154: ip_savecontrol(last, &opts, ip, m);
155: if (sbappendaddr(&last->inp_socket->so_rcv,
156: sintosa(&ripsrc), m, opts) == 0) {
1.13 mycroft 157: m_freem(m);
1.36 thorpej 158: if (opts)
159: m_freem(opts);
160: } else
161: sorwakeup(last->inp_socket);
1.13 mycroft 162: } else {
163: m_freem(m);
1.1 cgd 164: ipstat.ips_noproto++;
165: ipstat.ips_delivered--;
166: }
167: }
168:
169: /*
170: * Generate IP header and pass packet to ip_output.
171: * Tack on options user may have setup with control call.
172: */
1.9 mycroft 173: int
1.24 christos 174: #if __STDC__
175: rip_output(struct mbuf *m, ...)
176: #else
177: rip_output(m, va_alist)
178: struct mbuf *m;
179: va_dcl
180: #endif
181: {
1.27 mycroft 182: register struct inpcb *inp;
1.1 cgd 183: register struct ip *ip;
1.10 mycroft 184: struct mbuf *opts;
1.24 christos 185: int flags;
186: va_list ap;
187:
188: va_start(ap, m);
1.27 mycroft 189: inp = va_arg(ap, struct inpcb *);
1.24 christos 190: va_end(ap);
191:
1.27 mycroft 192: flags =
1.37 matt 193: (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST
194: | IP_RETURNMTU;
1.1 cgd 195:
196: /*
197: * If the user handed us a complete IP packet, use it.
198: * Otherwise, allocate an mbuf for a header and fill it in.
199: */
1.13 mycroft 200: if ((inp->inp_flags & INP_HDRINCL) == 0) {
1.35 thorpej 201: if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) {
202: m_freem(m);
203: return (EMSGSIZE);
204: }
1.1 cgd 205: M_PREPEND(m, sizeof(struct ip), M_WAIT);
206: ip = mtod(m, struct ip *);
207: ip->ip_tos = 0;
208: ip->ip_off = 0;
1.13 mycroft 209: ip->ip_p = inp->inp_ip.ip_p;
1.1 cgd 210: ip->ip_len = m->m_pkthdr.len;
1.13 mycroft 211: ip->ip_src = inp->inp_laddr;
1.27 mycroft 212: ip->ip_dst = inp->inp_faddr;
1.1 cgd 213: ip->ip_ttl = MAXTTL;
1.13 mycroft 214: opts = inp->inp_options;
215: } else {
1.35 thorpej 216: if (m->m_pkthdr.len > IP_MAXPACKET) {
217: m_freem(m);
218: return (EMSGSIZE);
219: }
1.13 mycroft 220: ip = mtod(m, struct ip *);
1.38 mycroft 221: if (m->m_pkthdr.len != ip->ip_len) {
222: m_freem(m);
223: return (EINVAL);
224: }
1.13 mycroft 225: if (ip->ip_id == 0)
226: ip->ip_id = htons(ip_id++);
227: opts = NULL;
228: /* XXX prevent ip_output from overwriting header fields */
229: flags |= IP_RAWOUTPUT;
230: ipstat.ips_rawout++;
1.1 cgd 231: }
1.37 matt 232: return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions, &inp->inp_errormtu));
1.1 cgd 233: }
234:
235: /*
236: * Raw IP socket option processing.
237: */
1.9 mycroft 238: int
1.1 cgd 239: rip_ctloutput(op, so, level, optname, m)
240: int op;
241: struct socket *so;
242: int level, optname;
243: struct mbuf **m;
244: {
1.13 mycroft 245: register struct inpcb *inp = sotoinpcb(so);
1.31 mycroft 246: int error = 0;
1.1 cgd 247:
1.15 mycroft 248: if (level != IPPROTO_IP) {
1.31 mycroft 249: error = ENOPROTOOPT;
250: if (op == PRCO_SETOPT && *m != 0)
251: (void) m_free(*m);
252: } else switch (op) {
253:
254: case PRCO_SETOPT:
255: switch (optname) {
256: case IP_HDRINCL:
257: if (*m == 0 || (*m)->m_len < sizeof (int))
258: error = EINVAL;
259: else {
1.13 mycroft 260: if (*mtod(*m, int *))
261: inp->inp_flags |= INP_HDRINCL;
262: else
263: inp->inp_flags &= ~INP_HDRINCL;
264: }
1.31 mycroft 265: if (*m != 0)
266: (void) m_free(*m);
267: break;
268:
269: #ifdef MROUTING
270: case MRT_INIT:
271: case MRT_DONE:
272: case MRT_ADD_VIF:
273: case MRT_DEL_VIF:
274: case MRT_ADD_MFC:
275: case MRT_DEL_MFC:
276: case MRT_ASSERT:
277: error = ip_mrouter_set(so, optname, m);
278: break;
279: #endif
280:
281: default:
282: error = ip_ctloutput(op, so, level, optname, m);
283: break;
1.13 mycroft 284: }
285: break;
1.1 cgd 286:
1.31 mycroft 287: case PRCO_GETOPT:
288: switch (optname) {
289: case IP_HDRINCL:
290: *m = m_get(M_WAIT, M_SOOPTS);
291: (*m)->m_len = sizeof (int);
292: *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0;
293: break;
294:
1.6 hpeyerl 295: #ifdef MROUTING
1.31 mycroft 296: case MRT_VERSION:
297: case MRT_ASSERT:
298: error = ip_mrouter_get(so, optname, m);
1.18 mycroft 299: break;
1.31 mycroft 300: #endif
301:
1.18 mycroft 302: default:
1.31 mycroft 303: error = ip_ctloutput(op, so, level, optname, m);
1.18 mycroft 304: break;
305: }
1.31 mycroft 306: break;
1.1 cgd 307: }
1.31 mycroft 308: return (error);
1.1 cgd 309: }
310:
1.27 mycroft 311: int
1.29 mycroft 312: rip_bind(inp, nam)
313: struct inpcb *inp;
314: struct mbuf *nam;
315: {
316: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
317:
318: if (nam->m_len != sizeof(*addr))
319: return (EINVAL);
320: if (ifnet.tqh_first == 0)
321: return (EADDRNOTAVAIL);
322: if (addr->sin_family != AF_INET &&
323: addr->sin_family != AF_IMPLINK)
324: return (EAFNOSUPPORT);
1.32 mycroft 325: if (!in_nullhost(addr->sin_addr) &&
1.29 mycroft 326: ifa_ifwithaddr(sintosa(addr)) == 0)
327: return (EADDRNOTAVAIL);
328: inp->inp_laddr = addr->sin_addr;
329: return (0);
330: }
331:
332: int
1.27 mycroft 333: rip_connect(inp, nam)
334: struct inpcb *inp;
335: struct mbuf *nam;
336: {
337: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
338:
339: if (nam->m_len != sizeof(*addr))
340: return (EINVAL);
341: if (ifnet.tqh_first == 0)
342: return (EADDRNOTAVAIL);
343: if (addr->sin_family != AF_INET &&
344: addr->sin_family != AF_IMPLINK)
345: return (EAFNOSUPPORT);
346: inp->inp_faddr = addr->sin_addr;
347: return (0);
348: }
349:
350: void
351: rip_disconnect(inp)
352: struct inpcb *inp;
353: {
354:
1.32 mycroft 355: inp->inp_faddr = zeroin_addr;
1.27 mycroft 356: }
357:
1.13 mycroft 358: u_long rip_sendspace = RIPSNDQ;
359: u_long rip_recvspace = RIPRCVQ;
360:
1.1 cgd 361: /*ARGSUSED*/
1.9 mycroft 362: int
1.26 mycroft 363: rip_usrreq(so, req, m, nam, control, p)
1.1 cgd 364: register struct socket *so;
365: int req;
1.2 cgd 366: struct mbuf *m, *nam, *control;
1.26 mycroft 367: struct proc *p;
1.1 cgd 368: {
1.27 mycroft 369: register struct inpcb *inp;
370: int s;
1.1 cgd 371: register int error = 0;
1.13 mycroft 372: #ifdef MROUTING
1.6 hpeyerl 373: extern struct socket *ip_mrouter;
374: #endif
1.27 mycroft 375:
1.22 pk 376: if (req == PRU_CONTROL)
377: return (in_control(so, (long)m, (caddr_t)nam,
1.26 mycroft 378: (struct ifnet *)control, p));
1.22 pk 379:
1.27 mycroft 380: s = splsoftnet();
381: inp = sotoinpcb(so);
1.28 mycroft 382: #ifdef DIAGNOSTIC
383: if (req != PRU_SEND && req != PRU_SENDOOB && control)
384: panic("rip_usrreq: unexpected control mbuf");
385: #endif
1.27 mycroft 386: if (inp == 0 && req != PRU_ATTACH) {
1.22 pk 387: error = EINVAL;
388: goto release;
389: }
390:
1.1 cgd 391: switch (req) {
392:
393: case PRU_ATTACH:
1.27 mycroft 394: if (inp != 0) {
395: error = EISCONN;
396: break;
397: }
1.26 mycroft 398: if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
1.13 mycroft 399: error = EACCES;
400: break;
401: }
1.27 mycroft 402: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
403: error = soreserve(so, rip_sendspace, rip_recvspace);
404: if (error)
405: break;
406: }
407: error = in_pcballoc(so, &rawcbtable);
408: if (error)
1.13 mycroft 409: break;
1.27 mycroft 410: inp = sotoinpcb(so);
1.17 cgd 411: inp->inp_ip.ip_p = (long)nam;
1.1 cgd 412: break;
413:
414: case PRU_DETACH:
1.13 mycroft 415: #ifdef MROUTING
1.6 hpeyerl 416: if (so == ip_mrouter)
417: ip_mrouter_done();
418: #endif
1.13 mycroft 419: in_pcbdetach(inp);
1.1 cgd 420: break;
421:
422: case PRU_BIND:
1.29 mycroft 423: error = rip_bind(inp, nam);
1.27 mycroft 424: break;
425:
426: case PRU_LISTEN:
427: error = EOPNOTSUPP;
428: break;
429:
430: case PRU_CONNECT:
431: error = rip_connect(inp, nam);
432: if (error)
1.13 mycroft 433: break;
1.1 cgd 434: soisconnected(so);
1.13 mycroft 435: break;
436:
437: case PRU_CONNECT2:
438: error = EOPNOTSUPP;
439: break;
440:
1.27 mycroft 441: case PRU_DISCONNECT:
442: soisdisconnected(so);
443: rip_disconnect(inp);
444: break;
445:
1.13 mycroft 446: /*
447: * Mark the connection as being incapable of further input.
448: */
449: case PRU_SHUTDOWN:
450: socantsendmore(so);
451: break;
452:
1.27 mycroft 453: case PRU_RCVD:
454: error = EOPNOTSUPP;
455: break;
456:
1.13 mycroft 457: /*
458: * Ship a packet out. The appropriate raw output
459: * routine handles any massaging necessary.
460: */
461: case PRU_SEND:
1.28 mycroft 462: if (control && control->m_len) {
463: m_freem(control);
464: m_freem(m);
465: error = EINVAL;
466: break;
467: }
468: {
1.27 mycroft 469: if (nam) {
470: if ((so->so_state & SS_ISCONNECTED) != 0) {
1.13 mycroft 471: error = EISCONN;
1.28 mycroft 472: goto die;
1.13 mycroft 473: }
1.27 mycroft 474: error = rip_connect(inp, nam);
475: if (error) {
1.28 mycroft 476: die:
1.27 mycroft 477: m_freem(m);
478: break;
479: }
1.13 mycroft 480: } else {
1.27 mycroft 481: if ((so->so_state & SS_ISCONNECTED) == 0) {
1.13 mycroft 482: error = ENOTCONN;
1.28 mycroft 483: goto die;
1.13 mycroft 484: }
485: }
1.27 mycroft 486: error = rip_output(m, inp);
487: if (nam)
488: rip_disconnect(inp);
1.28 mycroft 489: }
1.13 mycroft 490: break;
491:
492: case PRU_SENSE:
493: /*
494: * stat: don't bother with a blocksize.
495: */
1.27 mycroft 496: splx(s);
1.1 cgd 497: return (0);
1.13 mycroft 498:
499: case PRU_RCVOOB:
1.27 mycroft 500: error = EOPNOTSUPP;
501: break;
502:
1.13 mycroft 503: case PRU_SENDOOB:
1.28 mycroft 504: m_freem(control);
1.27 mycroft 505: m_freem(m);
1.13 mycroft 506: error = EOPNOTSUPP;
507: break;
508:
509: case PRU_SOCKADDR:
510: in_setsockaddr(inp, nam);
511: break;
512:
513: case PRU_PEERADDR:
514: in_setpeeraddr(inp, nam);
515: break;
516:
517: default:
518: panic("rip_usrreq");
1.1 cgd 519: }
1.27 mycroft 520:
1.22 pk 521: release:
1.27 mycroft 522: splx(s);
1.1 cgd 523: return (error);
524: }
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