Annotation of src/sys/netinet/raw_ip.c, Revision 1.35
1.35 ! thorpej 1: /* $NetBSD: raw_ip.c,v 1.34 1996/09/16 17:45:17 mycroft 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: * @(#)raw_ip.c 8.2 (Berkeley) 1/4/94
1.1 cgd 36: */
37:
1.7 mycroft 38: #include <sys/param.h>
39: #include <sys/malloc.h>
40: #include <sys/mbuf.h>
41: #include <sys/socket.h>
42: #include <sys/protosw.h>
43: #include <sys/socketvar.h>
44: #include <sys/errno.h>
1.13 mycroft 45: #include <sys/systm.h>
1.26 mycroft 46: #include <sys/proc.h>
1.1 cgd 47:
1.7 mycroft 48: #include <net/if.h>
49: #include <net/route.h>
1.1 cgd 50:
1.7 mycroft 51: #include <netinet/in.h>
52: #include <netinet/in_systm.h>
53: #include <netinet/ip.h>
54: #include <netinet/ip_var.h>
1.13 mycroft 55: #include <netinet/ip_mroute.h>
1.7 mycroft 56: #include <netinet/in_pcb.h>
1.24 christos 57: #include <netinet/in_var.h>
58:
59: #include <machine/stdarg.h>
1.13 mycroft 60:
1.20 mycroft 61: struct inpcbtable rawcbtable;
1.30 pk 62:
63: int rip_bind __P((struct inpcb *, struct mbuf *));
64: int rip_connect __P((struct inpcb *, struct mbuf *));
65: void rip_disconnect __P((struct inpcb *));
1.13 mycroft 66:
67: /*
68: * Nominal space allocated to a raw ip socket.
69: */
70: #define RIPSNDQ 8192
71: #define RIPRCVQ 8192
1.1 cgd 72:
73: /*
74: * Raw interface to IP protocol.
75: */
1.13 mycroft 76:
77: /*
78: * Initialize raw connection block q.
79: */
80: void
81: rip_init()
82: {
83:
1.33 mycroft 84: in_pcbinit(&rawcbtable, 1, 1);
1.13 mycroft 85: }
86:
1.1 cgd 87: /*
88: * Setup generic address and protocol structures
89: * for raw_input routine, then pass them along with
90: * mbuf chain.
91: */
1.9 mycroft 92: void
1.24 christos 93: #if __STDC__
94: rip_input(struct mbuf *m, ...)
95: #else
96: rip_input(m, va_alist)
1.1 cgd 97: struct mbuf *m;
1.24 christos 98: va_dcl
99: #endif
1.1 cgd 100: {
101: register struct ip *ip = mtod(m, struct ip *);
1.13 mycroft 102: register struct inpcb *inp;
103: struct socket *last = 0;
1.32 mycroft 104: struct sockaddr_in ripsrc;
1.1 cgd 105:
1.32 mycroft 106: ripsrc.sin_family = AF_INET;
107: ripsrc.sin_len = sizeof(struct sockaddr_in);
1.1 cgd 108: ripsrc.sin_addr = ip->ip_src;
1.34 mycroft 109: ripsrc.sin_port = 0;
110: bzero((caddr_t)ripsrc.sin_zero, sizeof(ripsrc.sin_zero));
1.32 mycroft 111:
1.21 cgd 112: for (inp = rawcbtable.inpt_queue.cqh_first;
113: inp != (struct inpcb *)&rawcbtable.inpt_queue;
114: inp = inp->inp_queue.cqe_next) {
1.13 mycroft 115: if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
116: continue;
1.32 mycroft 117: if (!in_nullhost(inp->inp_laddr) &&
118: !in_hosteq(inp->inp_laddr, ip->ip_dst))
1.13 mycroft 119: continue;
1.32 mycroft 120: if (!in_nullhost(inp->inp_faddr) &&
121: !in_hosteq(inp->inp_faddr, ip->ip_src))
1.13 mycroft 122: continue;
123: if (last) {
124: struct mbuf *n;
1.24 christos 125: if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1.13 mycroft 126: if (sbappendaddr(&last->so_rcv,
1.19 mycroft 127: sintosa(&ripsrc), n,
128: (struct mbuf *)0) == 0)
1.13 mycroft 129: /* should notify about lost packet */
130: m_freem(n);
131: else
132: sorwakeup(last);
133: }
134: }
135: last = inp->inp_socket;
136: }
137: if (last) {
1.19 mycroft 138: if (sbappendaddr(&last->so_rcv, sintosa(&ripsrc), m,
139: (struct mbuf *)0) == 0)
1.13 mycroft 140: m_freem(m);
141: else
142: sorwakeup(last);
143: } else {
144: m_freem(m);
1.1 cgd 145: ipstat.ips_noproto++;
146: ipstat.ips_delivered--;
147: }
148: }
149:
150: /*
151: * Generate IP header and pass packet to ip_output.
152: * Tack on options user may have setup with control call.
153: */
1.9 mycroft 154: int
1.24 christos 155: #if __STDC__
156: rip_output(struct mbuf *m, ...)
157: #else
158: rip_output(m, va_alist)
159: struct mbuf *m;
160: va_dcl
161: #endif
162: {
1.27 mycroft 163: register struct inpcb *inp;
1.1 cgd 164: register struct ip *ip;
1.10 mycroft 165: struct mbuf *opts;
1.24 christos 166: int flags;
167: va_list ap;
168:
169: va_start(ap, m);
1.27 mycroft 170: inp = va_arg(ap, struct inpcb *);
1.24 christos 171: va_end(ap);
172:
1.27 mycroft 173: flags =
174: (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
1.1 cgd 175:
176: /*
177: * If the user handed us a complete IP packet, use it.
178: * Otherwise, allocate an mbuf for a header and fill it in.
179: */
1.13 mycroft 180: if ((inp->inp_flags & INP_HDRINCL) == 0) {
1.35 ! thorpej 181: if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) {
! 182: m_freem(m);
! 183: return (EMSGSIZE);
! 184: }
1.1 cgd 185: M_PREPEND(m, sizeof(struct ip), M_WAIT);
186: ip = mtod(m, struct ip *);
187: ip->ip_tos = 0;
188: ip->ip_off = 0;
1.13 mycroft 189: ip->ip_p = inp->inp_ip.ip_p;
1.1 cgd 190: ip->ip_len = m->m_pkthdr.len;
1.13 mycroft 191: ip->ip_src = inp->inp_laddr;
1.27 mycroft 192: ip->ip_dst = inp->inp_faddr;
1.1 cgd 193: ip->ip_ttl = MAXTTL;
1.13 mycroft 194: opts = inp->inp_options;
195: } else {
1.35 ! thorpej 196: if (m->m_pkthdr.len > IP_MAXPACKET) {
! 197: m_freem(m);
! 198: return (EMSGSIZE);
! 199: }
1.13 mycroft 200: ip = mtod(m, struct ip *);
201: if (ip->ip_id == 0)
202: ip->ip_id = htons(ip_id++);
203: opts = NULL;
204: /* XXX prevent ip_output from overwriting header fields */
205: flags |= IP_RAWOUTPUT;
206: ipstat.ips_rawout++;
1.1 cgd 207: }
1.13 mycroft 208: return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions));
1.1 cgd 209: }
210:
211: /*
212: * Raw IP socket option processing.
213: */
1.9 mycroft 214: int
1.1 cgd 215: rip_ctloutput(op, so, level, optname, m)
216: int op;
217: struct socket *so;
218: int level, optname;
219: struct mbuf **m;
220: {
1.13 mycroft 221: register struct inpcb *inp = sotoinpcb(so);
1.31 mycroft 222: int error = 0;
1.1 cgd 223:
1.15 mycroft 224: if (level != IPPROTO_IP) {
1.31 mycroft 225: error = ENOPROTOOPT;
226: if (op == PRCO_SETOPT && *m != 0)
227: (void) m_free(*m);
228: } else switch (op) {
229:
230: case PRCO_SETOPT:
231: switch (optname) {
232: case IP_HDRINCL:
233: if (*m == 0 || (*m)->m_len < sizeof (int))
234: error = EINVAL;
235: else {
1.13 mycroft 236: if (*mtod(*m, int *))
237: inp->inp_flags |= INP_HDRINCL;
238: else
239: inp->inp_flags &= ~INP_HDRINCL;
240: }
1.31 mycroft 241: if (*m != 0)
242: (void) m_free(*m);
243: break;
244:
245: #ifdef MROUTING
246: case MRT_INIT:
247: case MRT_DONE:
248: case MRT_ADD_VIF:
249: case MRT_DEL_VIF:
250: case MRT_ADD_MFC:
251: case MRT_DEL_MFC:
252: case MRT_ASSERT:
253: error = ip_mrouter_set(so, optname, m);
254: break;
255: #endif
256:
257: default:
258: error = ip_ctloutput(op, so, level, optname, m);
259: break;
1.13 mycroft 260: }
261: break;
1.1 cgd 262:
1.31 mycroft 263: case PRCO_GETOPT:
264: switch (optname) {
265: case IP_HDRINCL:
266: *m = m_get(M_WAIT, M_SOOPTS);
267: (*m)->m_len = sizeof (int);
268: *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0;
269: break;
270:
1.6 hpeyerl 271: #ifdef MROUTING
1.31 mycroft 272: case MRT_VERSION:
273: case MRT_ASSERT:
274: error = ip_mrouter_get(so, optname, m);
1.18 mycroft 275: break;
1.31 mycroft 276: #endif
277:
1.18 mycroft 278: default:
1.31 mycroft 279: error = ip_ctloutput(op, so, level, optname, m);
1.18 mycroft 280: break;
281: }
1.31 mycroft 282: break;
1.1 cgd 283: }
1.31 mycroft 284: return (error);
1.1 cgd 285: }
286:
1.27 mycroft 287: int
1.29 mycroft 288: rip_bind(inp, nam)
289: struct inpcb *inp;
290: struct mbuf *nam;
291: {
292: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
293:
294: if (nam->m_len != sizeof(*addr))
295: return (EINVAL);
296: if (ifnet.tqh_first == 0)
297: return (EADDRNOTAVAIL);
298: if (addr->sin_family != AF_INET &&
299: addr->sin_family != AF_IMPLINK)
300: return (EAFNOSUPPORT);
1.32 mycroft 301: if (!in_nullhost(addr->sin_addr) &&
1.29 mycroft 302: ifa_ifwithaddr(sintosa(addr)) == 0)
303: return (EADDRNOTAVAIL);
304: inp->inp_laddr = addr->sin_addr;
305: return (0);
306: }
307:
308: int
1.27 mycroft 309: rip_connect(inp, nam)
310: struct inpcb *inp;
311: struct mbuf *nam;
312: {
313: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
314:
315: if (nam->m_len != sizeof(*addr))
316: return (EINVAL);
317: if (ifnet.tqh_first == 0)
318: return (EADDRNOTAVAIL);
319: if (addr->sin_family != AF_INET &&
320: addr->sin_family != AF_IMPLINK)
321: return (EAFNOSUPPORT);
322: inp->inp_faddr = addr->sin_addr;
323: return (0);
324: }
325:
326: void
327: rip_disconnect(inp)
328: struct inpcb *inp;
329: {
330:
1.32 mycroft 331: inp->inp_faddr = zeroin_addr;
1.27 mycroft 332: }
333:
1.13 mycroft 334: u_long rip_sendspace = RIPSNDQ;
335: u_long rip_recvspace = RIPRCVQ;
336:
1.1 cgd 337: /*ARGSUSED*/
1.9 mycroft 338: int
1.26 mycroft 339: rip_usrreq(so, req, m, nam, control, p)
1.1 cgd 340: register struct socket *so;
341: int req;
1.2 cgd 342: struct mbuf *m, *nam, *control;
1.26 mycroft 343: struct proc *p;
1.1 cgd 344: {
1.27 mycroft 345: register struct inpcb *inp;
346: int s;
1.1 cgd 347: register int error = 0;
1.13 mycroft 348: #ifdef MROUTING
1.6 hpeyerl 349: extern struct socket *ip_mrouter;
350: #endif
1.27 mycroft 351:
1.22 pk 352: if (req == PRU_CONTROL)
353: return (in_control(so, (long)m, (caddr_t)nam,
1.26 mycroft 354: (struct ifnet *)control, p));
1.22 pk 355:
1.27 mycroft 356: s = splsoftnet();
357: inp = sotoinpcb(so);
1.28 mycroft 358: #ifdef DIAGNOSTIC
359: if (req != PRU_SEND && req != PRU_SENDOOB && control)
360: panic("rip_usrreq: unexpected control mbuf");
361: #endif
1.27 mycroft 362: if (inp == 0 && req != PRU_ATTACH) {
1.22 pk 363: error = EINVAL;
364: goto release;
365: }
366:
1.1 cgd 367: switch (req) {
368:
369: case PRU_ATTACH:
1.27 mycroft 370: if (inp != 0) {
371: error = EISCONN;
372: break;
373: }
1.26 mycroft 374: if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
1.13 mycroft 375: error = EACCES;
376: break;
377: }
1.27 mycroft 378: if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
379: error = soreserve(so, rip_sendspace, rip_recvspace);
380: if (error)
381: break;
382: }
383: error = in_pcballoc(so, &rawcbtable);
384: if (error)
1.13 mycroft 385: break;
1.27 mycroft 386: inp = sotoinpcb(so);
1.17 cgd 387: inp->inp_ip.ip_p = (long)nam;
1.1 cgd 388: break;
389:
390: case PRU_DETACH:
1.13 mycroft 391: #ifdef MROUTING
1.6 hpeyerl 392: if (so == ip_mrouter)
393: ip_mrouter_done();
394: #endif
1.13 mycroft 395: in_pcbdetach(inp);
1.1 cgd 396: break;
397:
398: case PRU_BIND:
1.29 mycroft 399: error = rip_bind(inp, nam);
1.27 mycroft 400: break;
401:
402: case PRU_LISTEN:
403: error = EOPNOTSUPP;
404: break;
405:
406: case PRU_CONNECT:
407: error = rip_connect(inp, nam);
408: if (error)
1.13 mycroft 409: break;
1.1 cgd 410: soisconnected(so);
1.13 mycroft 411: break;
412:
413: case PRU_CONNECT2:
414: error = EOPNOTSUPP;
415: break;
416:
1.27 mycroft 417: case PRU_DISCONNECT:
418: soisdisconnected(so);
419: rip_disconnect(inp);
420: break;
421:
1.13 mycroft 422: /*
423: * Mark the connection as being incapable of further input.
424: */
425: case PRU_SHUTDOWN:
426: socantsendmore(so);
427: break;
428:
1.27 mycroft 429: case PRU_RCVD:
430: error = EOPNOTSUPP;
431: break;
432:
1.13 mycroft 433: /*
434: * Ship a packet out. The appropriate raw output
435: * routine handles any massaging necessary.
436: */
437: case PRU_SEND:
1.28 mycroft 438: if (control && control->m_len) {
439: m_freem(control);
440: m_freem(m);
441: error = EINVAL;
442: break;
443: }
444: {
1.27 mycroft 445: if (nam) {
446: if ((so->so_state & SS_ISCONNECTED) != 0) {
1.13 mycroft 447: error = EISCONN;
1.28 mycroft 448: goto die;
1.13 mycroft 449: }
1.27 mycroft 450: error = rip_connect(inp, nam);
451: if (error) {
1.28 mycroft 452: die:
1.27 mycroft 453: m_freem(m);
454: break;
455: }
1.13 mycroft 456: } else {
1.27 mycroft 457: if ((so->so_state & SS_ISCONNECTED) == 0) {
1.13 mycroft 458: error = ENOTCONN;
1.28 mycroft 459: goto die;
1.13 mycroft 460: }
461: }
1.27 mycroft 462: error = rip_output(m, inp);
463: if (nam)
464: rip_disconnect(inp);
1.28 mycroft 465: }
1.13 mycroft 466: break;
467:
468: case PRU_SENSE:
469: /*
470: * stat: don't bother with a blocksize.
471: */
1.27 mycroft 472: splx(s);
1.1 cgd 473: return (0);
1.13 mycroft 474:
475: case PRU_RCVOOB:
1.27 mycroft 476: error = EOPNOTSUPP;
477: break;
478:
1.13 mycroft 479: case PRU_SENDOOB:
1.28 mycroft 480: m_freem(control);
1.27 mycroft 481: m_freem(m);
1.13 mycroft 482: error = EOPNOTSUPP;
483: break;
484:
485: case PRU_SOCKADDR:
486: in_setsockaddr(inp, nam);
487: break;
488:
489: case PRU_PEERADDR:
490: in_setpeeraddr(inp, nam);
491: break;
492:
493: default:
494: panic("rip_usrreq");
1.1 cgd 495: }
1.27 mycroft 496:
1.22 pk 497: release:
1.27 mycroft 498: splx(s);
1.1 cgd 499: return (error);
500: }
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