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raw_ip.c revision 1.28 
      1 /*	$NetBSD: raw_ip.c,v 1.28 1996/05/23 17:03:27 mycroft Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1982, 1986, 1988, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      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  *
     35  *	@(#)raw_ip.c	8.2 (Berkeley) 1/4/94
     36  */
     37 
     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>
     45 #include <sys/systm.h>
     46 #include <sys/proc.h>
     47 
     48 #include <net/if.h>
     49 #include <net/route.h>
     50 
     51 #include <netinet/in.h>
     52 #include <netinet/in_systm.h>
     53 #include <netinet/ip.h>
     54 #include <netinet/ip_var.h>
     55 #include <netinet/ip_mroute.h>
     56 #include <netinet/in_pcb.h>
     57 #include <netinet/in_var.h>
     58 
     59 #include <machine/stdarg.h>
     60 
     61 struct inpcbtable rawcbtable;
     62 
     63 /*
     64  * Nominal space allocated to a raw ip socket.
     65  */
     66 #define	RIPSNDQ		8192
     67 #define	RIPRCVQ		8192
     68 
     69 /*
     70  * Raw interface to IP protocol.
     71  */
     72 
     73 /*
     74  * Initialize raw connection block q.
     75  */
     76 void
     77 rip_init()
     78 {
     79 
     80 	in_pcbinit(&rawcbtable, 1);
     81 }
     82 
     83 struct	sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
     84 /*
     85  * Setup generic address and protocol structures
     86  * for raw_input routine, then pass them along with
     87  * mbuf chain.
     88  */
     89 void
     90 #if __STDC__
     91 rip_input(struct mbuf *m, ...)
     92 #else
     93 rip_input(m, va_alist)
     94 	struct mbuf *m;
     95 	va_dcl
     96 #endif
     97 {
     98 	register struct ip *ip = mtod(m, struct ip *);
     99 	register struct inpcb *inp;
    100 	struct socket *last = 0;
    101 
    102 	ripsrc.sin_addr = ip->ip_src;
    103 	for (inp = rawcbtable.inpt_queue.cqh_first;
    104 	    inp != (struct inpcb *)&rawcbtable.inpt_queue;
    105 	    inp = inp->inp_queue.cqe_next) {
    106 		if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
    107 			continue;
    108 		if (inp->inp_laddr.s_addr != INADDR_ANY &&
    109 		    inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
    110 			continue;
    111 		if (inp->inp_faddr.s_addr != INADDR_ANY &&
    112 		    inp->inp_faddr.s_addr != ip->ip_src.s_addr)
    113 			continue;
    114 		if (last) {
    115 			struct mbuf *n;
    116 			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
    117 				if (sbappendaddr(&last->so_rcv,
    118 				    sintosa(&ripsrc), n,
    119 				    (struct mbuf *)0) == 0)
    120 					/* should notify about lost packet */
    121 					m_freem(n);
    122 				else
    123 					sorwakeup(last);
    124 			}
    125 		}
    126 		last = inp->inp_socket;
    127 	}
    128 	if (last) {
    129 		if (sbappendaddr(&last->so_rcv, sintosa(&ripsrc), m,
    130 		    (struct mbuf *)0) == 0)
    131 			m_freem(m);
    132 		else
    133 			sorwakeup(last);
    134 	} else {
    135 		m_freem(m);
    136 		ipstat.ips_noproto++;
    137 		ipstat.ips_delivered--;
    138 	}
    139 }
    140 
    141 /*
    142  * Generate IP header and pass packet to ip_output.
    143  * Tack on options user may have setup with control call.
    144  */
    145 int
    146 #if __STDC__
    147 rip_output(struct mbuf *m, ...)
    148 #else
    149 rip_output(m, va_alist)
    150 	struct mbuf *m;
    151 	va_dcl
    152 #endif
    153 {
    154 	register struct inpcb *inp;
    155 	register struct ip *ip;
    156 	struct mbuf *opts;
    157 	int flags;
    158 	va_list ap;
    159 
    160 	va_start(ap, m);
    161 	inp = va_arg(ap, struct inpcb *);
    162 	va_end(ap);
    163 
    164 	flags =
    165 	    (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
    166 
    167 	/*
    168 	 * If the user handed us a complete IP packet, use it.
    169 	 * Otherwise, allocate an mbuf for a header and fill it in.
    170 	 */
    171 	if ((inp->inp_flags & INP_HDRINCL) == 0) {
    172 		M_PREPEND(m, sizeof(struct ip), M_WAIT);
    173 		ip = mtod(m, struct ip *);
    174 		ip->ip_tos = 0;
    175 		ip->ip_off = 0;
    176 		ip->ip_p = inp->inp_ip.ip_p;
    177 		ip->ip_len = m->m_pkthdr.len;
    178 		ip->ip_src = inp->inp_laddr;
    179 		ip->ip_dst = inp->inp_faddr;
    180 		ip->ip_ttl = MAXTTL;
    181 		opts = inp->inp_options;
    182 	} else {
    183 		ip = mtod(m, struct ip *);
    184 		if (ip->ip_id == 0)
    185 			ip->ip_id = htons(ip_id++);
    186 		opts = NULL;
    187 		/* XXX prevent ip_output from overwriting header fields */
    188 		flags |= IP_RAWOUTPUT;
    189 		ipstat.ips_rawout++;
    190 	}
    191 	return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions));
    192 }
    193 
    194 /*
    195  * Raw IP socket option processing.
    196  */
    197 int
    198 rip_ctloutput(op, so, level, optname, m)
    199 	int op;
    200 	struct socket *so;
    201 	int level, optname;
    202 	struct mbuf **m;
    203 {
    204 	register struct inpcb *inp = sotoinpcb(so);
    205 #ifdef MROUTING
    206 	int error;
    207 #endif
    208 
    209 	if (level != IPPROTO_IP) {
    210 		if (m != 0 && *m != 0)
    211 			(void)m_free(*m);
    212 		return (EINVAL);
    213 	}
    214 
    215 	switch (optname) {
    216 
    217 	case IP_HDRINCL:
    218 		if (op == PRCO_SETOPT || op == PRCO_GETOPT) {
    219 			if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int))
    220 				return (EINVAL);
    221 			if (op == PRCO_SETOPT) {
    222 				if (*mtod(*m, int *))
    223 					inp->inp_flags |= INP_HDRINCL;
    224 				else
    225 					inp->inp_flags &= ~INP_HDRINCL;
    226 				(void)m_free(*m);
    227 			} else {
    228 				(*m)->m_len = sizeof (int);
    229 				*mtod(*m, int *) = inp->inp_flags & INP_HDRINCL;
    230 			}
    231 			return (0);
    232 		}
    233 		break;
    234 
    235 	case MRT_INIT:
    236 	case MRT_DONE:
    237 	case MRT_ADD_VIF:
    238 	case MRT_DEL_VIF:
    239 	case MRT_ADD_MFC:
    240 	case MRT_DEL_MFC:
    241 	case MRT_VERSION:
    242 	case MRT_ASSERT:
    243 #ifdef MROUTING
    244 		switch (op) {
    245 		case PRCO_SETOPT:
    246 			error = ip_mrouter_set(optname, so, m);
    247 			break;
    248 		case PRCO_GETOPT:
    249 			error = ip_mrouter_get(optname, so, m);
    250 			break;
    251 		default:
    252 			error = EINVAL;
    253 			break;
    254 		}
    255 		return (error);
    256 #else
    257 		if (op == PRCO_SETOPT && *m)
    258 			m_free(*m);
    259 		return (EOPNOTSUPP);
    260 #endif
    261 	}
    262 	return (ip_ctloutput(op, so, level, optname, m));
    263 }
    264 
    265 int
    266 rip_connect(inp, nam)
    267 	struct inpcb *inp;
    268 	struct mbuf *nam;
    269 {
    270 	struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
    271 
    272 	if (nam->m_len != sizeof(*addr))
    273 		return (EINVAL);
    274 	if (ifnet.tqh_first == 0)
    275 		return (EADDRNOTAVAIL);
    276 	if (addr->sin_family != AF_INET &&
    277 	    addr->sin_family != AF_IMPLINK)
    278 		return (EAFNOSUPPORT);
    279 	inp->inp_faddr = addr->sin_addr;
    280 	return (0);
    281 }
    282 
    283 void
    284 rip_disconnect(inp)
    285 	struct inpcb *inp;
    286 {
    287 
    288 	inp->inp_faddr.s_addr = INADDR_ANY;
    289 }
    290 
    291 u_long	rip_sendspace = RIPSNDQ;
    292 u_long	rip_recvspace = RIPRCVQ;
    293 
    294 /*ARGSUSED*/
    295 int
    296 rip_usrreq(so, req, m, nam, control, p)
    297 	register struct socket *so;
    298 	int req;
    299 	struct mbuf *m, *nam, *control;
    300 	struct proc *p;
    301 {
    302 	register struct inpcb *inp;
    303 	int s;
    304 	register int error = 0;
    305 #ifdef MROUTING
    306 	extern struct socket *ip_mrouter;
    307 #endif
    308 
    309 	if (req == PRU_CONTROL)
    310 		return (in_control(so, (long)m, (caddr_t)nam,
    311 		    (struct ifnet *)control, p));
    312 
    313 	s = splsoftnet();
    314 	inp = sotoinpcb(so);
    315 #ifdef DIAGNOSTIC
    316 	if (req != PRU_SEND && req != PRU_SENDOOB && control)
    317 		panic("rip_usrreq: unexpected control mbuf");
    318 #endif
    319 	if (inp == 0 && req != PRU_ATTACH) {
    320 		error = EINVAL;
    321 		goto release;
    322 	}
    323 
    324 	switch (req) {
    325 
    326 	case PRU_ATTACH:
    327 		if (inp != 0) {
    328 			error = EISCONN;
    329 			break;
    330 		}
    331 		if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
    332 			error = EACCES;
    333 			break;
    334 		}
    335 		if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
    336 			error = soreserve(so, rip_sendspace, rip_recvspace);
    337 			if (error)
    338 				break;
    339 		}
    340 		error = in_pcballoc(so, &rawcbtable);
    341 		if (error)
    342 			break;
    343 		inp = sotoinpcb(so);
    344 		inp->inp_ip.ip_p = (long)nam;
    345 		break;
    346 
    347 	case PRU_DETACH:
    348 #ifdef MROUTING
    349 		if (so == ip_mrouter)
    350 			ip_mrouter_done();
    351 #endif
    352 		in_pcbdetach(inp);
    353 		break;
    354 
    355 	case PRU_BIND:
    356 	    {
    357 		struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
    358 
    359 		if (nam->m_len != sizeof(*addr)) {
    360 			error = EINVAL;
    361 			break;
    362 		}
    363 		if (ifnet.tqh_first == 0) {
    364 			error = EADDRNOTAVAIL;
    365 			break;
    366 		}
    367 		if (addr->sin_family != AF_INET &&
    368 		    addr->sin_family != AF_IMPLINK) {
    369 			error = EAFNOSUPPORT;
    370 			break;
    371 		}
    372 		if (addr->sin_addr.s_addr != INADDR_ANY &&
    373 		    ifa_ifwithaddr(sintosa(addr)) == 0) {
    374 			error = EADDRNOTAVAIL;
    375 			break;
    376 		}
    377 		inp->inp_laddr = addr->sin_addr;
    378 		break;
    379 	    }
    380 
    381 	case PRU_LISTEN:
    382 		error = EOPNOTSUPP;
    383 		break;
    384 
    385 	case PRU_CONNECT:
    386 		error = rip_connect(inp, nam);
    387 		if (error)
    388 			break;
    389 		soisconnected(so);
    390 		break;
    391 
    392 	case PRU_CONNECT2:
    393 		error = EOPNOTSUPP;
    394 		break;
    395 
    396 	case PRU_DISCONNECT:
    397 		soisdisconnected(so);
    398 		rip_disconnect(inp);
    399 		break;
    400 
    401 	/*
    402 	 * Mark the connection as being incapable of further input.
    403 	 */
    404 	case PRU_SHUTDOWN:
    405 		socantsendmore(so);
    406 		break;
    407 
    408 	case PRU_RCVD:
    409 		error = EOPNOTSUPP;
    410 		break;
    411 
    412 	/*
    413 	 * Ship a packet out.  The appropriate raw output
    414 	 * routine handles any massaging necessary.
    415 	 */
    416 	case PRU_SEND:
    417 		if (control && control->m_len) {
    418 			m_freem(control);
    419 			m_freem(m);
    420 			error = EINVAL;
    421 			break;
    422 		}
    423 	{
    424 		if (nam) {
    425 			if ((so->so_state & SS_ISCONNECTED) != 0) {
    426 				error = EISCONN;
    427 				goto die;
    428 			}
    429 			error = rip_connect(inp, nam);
    430 			if (error) {
    431 			die:
    432 				m_freem(m);
    433 				break;
    434 			}
    435 		} else {
    436 			if ((so->so_state & SS_ISCONNECTED) == 0) {
    437 				error = ENOTCONN;
    438 				goto die;
    439 			}
    440 		}
    441 		error = rip_output(m, inp);
    442 		if (nam)
    443 			rip_disconnect(inp);
    444 	}
    445 		break;
    446 
    447 	case PRU_SENSE:
    448 		/*
    449 		 * stat: don't bother with a blocksize.
    450 		 */
    451 		splx(s);
    452 		return (0);
    453 
    454 	case PRU_RCVOOB:
    455 		error = EOPNOTSUPP;
    456 		break;
    457 
    458 	case PRU_SENDOOB:
    459 		m_freem(control);
    460 		m_freem(m);
    461 		error = EOPNOTSUPP;
    462 		break;
    463 
    464 	case PRU_SOCKADDR:
    465 		in_setsockaddr(inp, nam);
    466 		break;
    467 
    468 	case PRU_PEERADDR:
    469 		in_setpeeraddr(inp, nam);
    470 		break;
    471 
    472 	default:
    473 		panic("rip_usrreq");
    474 	}
    475 
    476 release:
    477 	splx(s);
    478 	return (error);
    479 }
    480