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raw_ip.c revision 1.37.2.1 
      1 /*	$NetBSD: raw_ip.c,v 1.37.2.1 1997/11/18 01:04:22 mellon 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 int	 rip_bind __P((struct inpcb *, struct mbuf *));
     64 int	 rip_connect __P((struct inpcb *, struct mbuf *));
     65 void	 rip_disconnect __P((struct inpcb *));
     66 
     67 /*
     68  * Nominal space allocated to a raw ip socket.
     69  */
     70 #define	RIPSNDQ		8192
     71 #define	RIPRCVQ		8192
     72 
     73 /*
     74  * Raw interface to IP protocol.
     75  */
     76 
     77 /*
     78  * Initialize raw connection block q.
     79  */
     80 void
     81 rip_init()
     82 {
     83 
     84 	in_pcbinit(&rawcbtable, 1, 1);
     85 }
     86 
     87 /*
     88  * Setup generic address and protocol structures
     89  * for raw_input routine, then pass them along with
     90  * mbuf chain.
     91  */
     92 void
     93 #if __STDC__
     94 rip_input(struct mbuf *m, ...)
     95 #else
     96 rip_input(m, va_alist)
     97 	struct mbuf *m;
     98 	va_dcl
     99 #endif
    100 {
    101 	register struct ip *ip = mtod(m, struct ip *);
    102 	register struct inpcb *inp;
    103 	struct inpcb *last = 0;
    104 	struct mbuf *opts = 0;
    105 	struct sockaddr_in ripsrc;
    106 
    107 	ripsrc.sin_family = AF_INET;
    108 	ripsrc.sin_len = sizeof(struct sockaddr_in);
    109 	ripsrc.sin_addr = ip->ip_src;
    110 	ripsrc.sin_port = 0;
    111 	bzero((caddr_t)ripsrc.sin_zero, sizeof(ripsrc.sin_zero));
    112 
    113 	for (inp = rawcbtable.inpt_queue.cqh_first;
    114 	    inp != (struct inpcb *)&rawcbtable.inpt_queue;
    115 	    inp = inp->inp_queue.cqe_next) {
    116 		if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
    117 			continue;
    118 		if (!in_nullhost(inp->inp_laddr) &&
    119 		    !in_hosteq(inp->inp_laddr, ip->ip_dst))
    120 			continue;
    121 		if (!in_nullhost(inp->inp_faddr) &&
    122 		    !in_hosteq(inp->inp_faddr, ip->ip_src))
    123 			continue;
    124 		if (last) {
    125 			struct mbuf *n;
    126 			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
    127 				if (last->inp_flags & INP_CONTROLOPTS ||
    128 				    last->inp_socket->so_options & SO_TIMESTAMP)
    129 					ip_savecontrol(last, &opts, ip, n);
    130 				if (sbappendaddr(&last->inp_socket->so_rcv,
    131 				    sintosa(&ripsrc), n, opts) == 0) {
    132 					/* should notify about lost packet */
    133 					m_freem(n);
    134 					if (opts)
    135 						m_freem(opts);
    136 				} else
    137 					sorwakeup(last->inp_socket);
    138 			}
    139 		}
    140 		last = inp;
    141 	}
    142 	if (last) {
    143 		if (last->inp_flags & INP_CONTROLOPTS ||
    144 		    last->inp_socket->so_options & SO_TIMESTAMP)
    145 			ip_savecontrol(last, &opts, ip, m);
    146 		if (sbappendaddr(&last->inp_socket->so_rcv,
    147 		    sintosa(&ripsrc), m, opts) == 0) {
    148 			m_freem(m);
    149 			if (opts)
    150 				m_freem(opts);
    151 		} else
    152 			sorwakeup(last->inp_socket);
    153 	} else {
    154 		m_freem(m);
    155 		ipstat.ips_noproto++;
    156 		ipstat.ips_delivered--;
    157 	}
    158 }
    159 
    160 /*
    161  * Generate IP header and pass packet to ip_output.
    162  * Tack on options user may have setup with control call.
    163  */
    164 int
    165 #if __STDC__
    166 rip_output(struct mbuf *m, ...)
    167 #else
    168 rip_output(m, va_alist)
    169 	struct mbuf *m;
    170 	va_dcl
    171 #endif
    172 {
    173 	register struct inpcb *inp;
    174 	register struct ip *ip;
    175 	struct mbuf *opts;
    176 	int flags;
    177 	va_list ap;
    178 
    179 	va_start(ap, m);
    180 	inp = va_arg(ap, struct inpcb *);
    181 	va_end(ap);
    182 
    183 	flags =
    184 	    (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST
    185 	    | IP_RETURNMTU;
    186 
    187 	/*
    188 	 * If the user handed us a complete IP packet, use it.
    189 	 * Otherwise, allocate an mbuf for a header and fill it in.
    190 	 */
    191 	if ((inp->inp_flags & INP_HDRINCL) == 0) {
    192 		if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) {
    193 			m_freem(m);
    194 			return (EMSGSIZE);
    195 		}
    196 		M_PREPEND(m, sizeof(struct ip), M_WAIT);
    197 		ip = mtod(m, struct ip *);
    198 		ip->ip_tos = 0;
    199 		ip->ip_off = 0;
    200 		ip->ip_p = inp->inp_ip.ip_p;
    201 		ip->ip_len = m->m_pkthdr.len;
    202 		ip->ip_src = inp->inp_laddr;
    203 		ip->ip_dst = inp->inp_faddr;
    204 		ip->ip_ttl = MAXTTL;
    205 		opts = inp->inp_options;
    206 	} else {
    207 		if (m->m_pkthdr.len > IP_MAXPACKET) {
    208 			m_freem(m);
    209 			return (EMSGSIZE);
    210 		}
    211 		ip = mtod(m, struct ip *);
    212 		if (m->m_pkthdr.len != ip->ip_len) {
    213 			m_freem(m);
    214 			return (EINVAL);
    215 		}
    216 		if (ip->ip_id == 0)
    217 			ip->ip_id = htons(ip_id++);
    218 		opts = NULL;
    219 		/* XXX prevent ip_output from overwriting header fields */
    220 		flags |= IP_RAWOUTPUT;
    221 		ipstat.ips_rawout++;
    222 	}
    223 	return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions, &inp->inp_errormtu));
    224 }
    225 
    226 /*
    227  * Raw IP socket option processing.
    228  */
    229 int
    230 rip_ctloutput(op, so, level, optname, m)
    231 	int op;
    232 	struct socket *so;
    233 	int level, optname;
    234 	struct mbuf **m;
    235 {
    236 	register struct inpcb *inp = sotoinpcb(so);
    237 	int error = 0;
    238 
    239 	if (level != IPPROTO_IP) {
    240 		error = ENOPROTOOPT;
    241 		if (op == PRCO_SETOPT && *m != 0)
    242 			(void) m_free(*m);
    243 	} else switch (op) {
    244 
    245 	case PRCO_SETOPT:
    246 		switch (optname) {
    247 		case IP_HDRINCL:
    248 			if (*m == 0 || (*m)->m_len < sizeof (int))
    249 				error = EINVAL;
    250 			else {
    251 				if (*mtod(*m, int *))
    252 					inp->inp_flags |= INP_HDRINCL;
    253 				else
    254 					inp->inp_flags &= ~INP_HDRINCL;
    255 			}
    256 			if (*m != 0)
    257 				(void) m_free(*m);
    258 			break;
    259 
    260 #ifdef MROUTING
    261 		case MRT_INIT:
    262 		case MRT_DONE:
    263 		case MRT_ADD_VIF:
    264 		case MRT_DEL_VIF:
    265 		case MRT_ADD_MFC:
    266 		case MRT_DEL_MFC:
    267 		case MRT_ASSERT:
    268 			error = ip_mrouter_set(so, optname, m);
    269 			break;
    270 #endif
    271 
    272 		default:
    273 			error = ip_ctloutput(op, so, level, optname, m);
    274 			break;
    275 		}
    276 		break;
    277 
    278 	case PRCO_GETOPT:
    279 		switch (optname) {
    280 		case IP_HDRINCL:
    281 			*m = m_get(M_WAIT, M_SOOPTS);
    282 			(*m)->m_len = sizeof (int);
    283 			*mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0;
    284 			break;
    285 
    286 #ifdef MROUTING
    287 		case MRT_VERSION:
    288 		case MRT_ASSERT:
    289 			error = ip_mrouter_get(so, optname, m);
    290 			break;
    291 #endif
    292 
    293 		default:
    294 			error = ip_ctloutput(op, so, level, optname, m);
    295 			break;
    296 		}
    297 		break;
    298 	}
    299 	return (error);
    300 }
    301 
    302 int
    303 rip_bind(inp, nam)
    304 	struct inpcb *inp;
    305 	struct mbuf *nam;
    306 {
    307 	struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
    308 
    309 	if (nam->m_len != sizeof(*addr))
    310 		return (EINVAL);
    311 	if (ifnet.tqh_first == 0)
    312 		return (EADDRNOTAVAIL);
    313 	if (addr->sin_family != AF_INET &&
    314 	    addr->sin_family != AF_IMPLINK)
    315 		return (EAFNOSUPPORT);
    316 	if (!in_nullhost(addr->sin_addr) &&
    317 	    ifa_ifwithaddr(sintosa(addr)) == 0)
    318 		return (EADDRNOTAVAIL);
    319 	inp->inp_laddr = addr->sin_addr;
    320 	return (0);
    321 }
    322 
    323 int
    324 rip_connect(inp, nam)
    325 	struct inpcb *inp;
    326 	struct mbuf *nam;
    327 {
    328 	struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
    329 
    330 	if (nam->m_len != sizeof(*addr))
    331 		return (EINVAL);
    332 	if (ifnet.tqh_first == 0)
    333 		return (EADDRNOTAVAIL);
    334 	if (addr->sin_family != AF_INET &&
    335 	    addr->sin_family != AF_IMPLINK)
    336 		return (EAFNOSUPPORT);
    337 	inp->inp_faddr = addr->sin_addr;
    338 	return (0);
    339 }
    340 
    341 void
    342 rip_disconnect(inp)
    343 	struct inpcb *inp;
    344 {
    345 
    346 	inp->inp_faddr = zeroin_addr;
    347 }
    348 
    349 u_long	rip_sendspace = RIPSNDQ;
    350 u_long	rip_recvspace = RIPRCVQ;
    351 
    352 /*ARGSUSED*/
    353 int
    354 rip_usrreq(so, req, m, nam, control, p)
    355 	register struct socket *so;
    356 	int req;
    357 	struct mbuf *m, *nam, *control;
    358 	struct proc *p;
    359 {
    360 	register struct inpcb *inp;
    361 	int s;
    362 	register int error = 0;
    363 #ifdef MROUTING
    364 	extern struct socket *ip_mrouter;
    365 #endif
    366 
    367 	if (req == PRU_CONTROL)
    368 		return (in_control(so, (long)m, (caddr_t)nam,
    369 		    (struct ifnet *)control, p));
    370 
    371 	s = splsoftnet();
    372 	inp = sotoinpcb(so);
    373 #ifdef DIAGNOSTIC
    374 	if (req != PRU_SEND && req != PRU_SENDOOB && control)
    375 		panic("rip_usrreq: unexpected control mbuf");
    376 #endif
    377 	if (inp == 0 && req != PRU_ATTACH) {
    378 		error = EINVAL;
    379 		goto release;
    380 	}
    381 
    382 	switch (req) {
    383 
    384 	case PRU_ATTACH:
    385 		if (inp != 0) {
    386 			error = EISCONN;
    387 			break;
    388 		}
    389 		if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
    390 			error = EACCES;
    391 			break;
    392 		}
    393 		if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
    394 			error = soreserve(so, rip_sendspace, rip_recvspace);
    395 			if (error)
    396 				break;
    397 		}
    398 		error = in_pcballoc(so, &rawcbtable);
    399 		if (error)
    400 			break;
    401 		inp = sotoinpcb(so);
    402 		inp->inp_ip.ip_p = (long)nam;
    403 		break;
    404 
    405 	case PRU_DETACH:
    406 #ifdef MROUTING
    407 		if (so == ip_mrouter)
    408 			ip_mrouter_done();
    409 #endif
    410 		in_pcbdetach(inp);
    411 		break;
    412 
    413 	case PRU_BIND:
    414 		error = rip_bind(inp, nam);
    415 		break;
    416 
    417 	case PRU_LISTEN:
    418 		error = EOPNOTSUPP;
    419 		break;
    420 
    421 	case PRU_CONNECT:
    422 		error = rip_connect(inp, nam);
    423 		if (error)
    424 			break;
    425 		soisconnected(so);
    426 		break;
    427 
    428 	case PRU_CONNECT2:
    429 		error = EOPNOTSUPP;
    430 		break;
    431 
    432 	case PRU_DISCONNECT:
    433 		soisdisconnected(so);
    434 		rip_disconnect(inp);
    435 		break;
    436 
    437 	/*
    438 	 * Mark the connection as being incapable of further input.
    439 	 */
    440 	case PRU_SHUTDOWN:
    441 		socantsendmore(so);
    442 		break;
    443 
    444 	case PRU_RCVD:
    445 		error = EOPNOTSUPP;
    446 		break;
    447 
    448 	/*
    449 	 * Ship a packet out.  The appropriate raw output
    450 	 * routine handles any massaging necessary.
    451 	 */
    452 	case PRU_SEND:
    453 		if (control && control->m_len) {
    454 			m_freem(control);
    455 			m_freem(m);
    456 			error = EINVAL;
    457 			break;
    458 		}
    459 	{
    460 		if (nam) {
    461 			if ((so->so_state & SS_ISCONNECTED) != 0) {
    462 				error = EISCONN;
    463 				goto die;
    464 			}
    465 			error = rip_connect(inp, nam);
    466 			if (error) {
    467 			die:
    468 				m_freem(m);
    469 				break;
    470 			}
    471 		} else {
    472 			if ((so->so_state & SS_ISCONNECTED) == 0) {
    473 				error = ENOTCONN;
    474 				goto die;
    475 			}
    476 		}
    477 		error = rip_output(m, inp);
    478 		if (nam)
    479 			rip_disconnect(inp);
    480 	}
    481 		break;
    482 
    483 	case PRU_SENSE:
    484 		/*
    485 		 * stat: don't bother with a blocksize.
    486 		 */
    487 		splx(s);
    488 		return (0);
    489 
    490 	case PRU_RCVOOB:
    491 		error = EOPNOTSUPP;
    492 		break;
    493 
    494 	case PRU_SENDOOB:
    495 		m_freem(control);
    496 		m_freem(m);
    497 		error = EOPNOTSUPP;
    498 		break;
    499 
    500 	case PRU_SOCKADDR:
    501 		in_setsockaddr(inp, nam);
    502 		break;
    503 
    504 	case PRU_PEERADDR:
    505 		in_setpeeraddr(inp, nam);
    506 		break;
    507 
    508 	default:
    509 		panic("rip_usrreq");
    510 	}
    511 
    512 release:
    513 	splx(s);
    514 	return (error);
    515 }
    516