Home | History | Annotate | Line # | Download | only in netinet
raw_ip.c revision 1.35 
      1 /*	$NetBSD: raw_ip.c,v 1.35 1996/10/25 06:33:36 thorpej 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 socket *last = 0;
    104 	struct sockaddr_in ripsrc;
    105 
    106 	ripsrc.sin_family = AF_INET;
    107 	ripsrc.sin_len = sizeof(struct sockaddr_in);
    108 	ripsrc.sin_addr = ip->ip_src;
    109 	ripsrc.sin_port = 0;
    110 	bzero((caddr_t)ripsrc.sin_zero, sizeof(ripsrc.sin_zero));
    111 
    112 	for (inp = rawcbtable.inpt_queue.cqh_first;
    113 	    inp != (struct inpcb *)&rawcbtable.inpt_queue;
    114 	    inp = inp->inp_queue.cqe_next) {
    115 		if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
    116 			continue;
    117 		if (!in_nullhost(inp->inp_laddr) &&
    118 		    !in_hosteq(inp->inp_laddr, ip->ip_dst))
    119 			continue;
    120 		if (!in_nullhost(inp->inp_faddr) &&
    121 		    !in_hosteq(inp->inp_faddr, ip->ip_src))
    122 			continue;
    123 		if (last) {
    124 			struct mbuf *n;
    125 			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
    126 				if (sbappendaddr(&last->so_rcv,
    127 				    sintosa(&ripsrc), n,
    128 				    (struct mbuf *)0) == 0)
    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) {
    138 		if (sbappendaddr(&last->so_rcv, sintosa(&ripsrc), m,
    139 		    (struct mbuf *)0) == 0)
    140 			m_freem(m);
    141 		else
    142 			sorwakeup(last);
    143 	} else {
    144 		m_freem(m);
    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  */
    154 int
    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 {
    163 	register struct inpcb *inp;
    164 	register struct ip *ip;
    165 	struct mbuf *opts;
    166 	int flags;
    167 	va_list ap;
    168 
    169 	va_start(ap, m);
    170 	inp = va_arg(ap, struct inpcb *);
    171 	va_end(ap);
    172 
    173 	flags =
    174 	    (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
    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 	 */
    180 	if ((inp->inp_flags & INP_HDRINCL) == 0) {
    181 		if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) {
    182 			m_freem(m);
    183 			return (EMSGSIZE);
    184 		}
    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;
    189 		ip->ip_p = inp->inp_ip.ip_p;
    190 		ip->ip_len = m->m_pkthdr.len;
    191 		ip->ip_src = inp->inp_laddr;
    192 		ip->ip_dst = inp->inp_faddr;
    193 		ip->ip_ttl = MAXTTL;
    194 		opts = inp->inp_options;
    195 	} else {
    196 		if (m->m_pkthdr.len > IP_MAXPACKET) {
    197 			m_freem(m);
    198 			return (EMSGSIZE);
    199 		}
    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++;
    207 	}
    208 	return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions));
    209 }
    210 
    211 /*
    212  * Raw IP socket option processing.
    213  */
    214 int
    215 rip_ctloutput(op, so, level, optname, m)
    216 	int op;
    217 	struct socket *so;
    218 	int level, optname;
    219 	struct mbuf **m;
    220 {
    221 	register struct inpcb *inp = sotoinpcb(so);
    222 	int error = 0;
    223 
    224 	if (level != IPPROTO_IP) {
    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 {
    236 				if (*mtod(*m, int *))
    237 					inp->inp_flags |= INP_HDRINCL;
    238 				else
    239 					inp->inp_flags &= ~INP_HDRINCL;
    240 			}
    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;
    260 		}
    261 		break;
    262 
    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 
    271 #ifdef MROUTING
    272 		case MRT_VERSION:
    273 		case MRT_ASSERT:
    274 			error = ip_mrouter_get(so, optname, m);
    275 			break;
    276 #endif
    277 
    278 		default:
    279 			error = ip_ctloutput(op, so, level, optname, m);
    280 			break;
    281 		}
    282 		break;
    283 	}
    284 	return (error);
    285 }
    286 
    287 int
    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);
    301 	if (!in_nullhost(addr->sin_addr) &&
    302 	    ifa_ifwithaddr(sintosa(addr)) == 0)
    303 		return (EADDRNOTAVAIL);
    304 	inp->inp_laddr = addr->sin_addr;
    305 	return (0);
    306 }
    307 
    308 int
    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 
    331 	inp->inp_faddr = zeroin_addr;
    332 }
    333 
    334 u_long	rip_sendspace = RIPSNDQ;
    335 u_long	rip_recvspace = RIPRCVQ;
    336 
    337 /*ARGSUSED*/
    338 int
    339 rip_usrreq(so, req, m, nam, control, p)
    340 	register struct socket *so;
    341 	int req;
    342 	struct mbuf *m, *nam, *control;
    343 	struct proc *p;
    344 {
    345 	register struct inpcb *inp;
    346 	int s;
    347 	register int error = 0;
    348 #ifdef MROUTING
    349 	extern struct socket *ip_mrouter;
    350 #endif
    351 
    352 	if (req == PRU_CONTROL)
    353 		return (in_control(so, (long)m, (caddr_t)nam,
    354 		    (struct ifnet *)control, p));
    355 
    356 	s = splsoftnet();
    357 	inp = sotoinpcb(so);
    358 #ifdef DIAGNOSTIC
    359 	if (req != PRU_SEND && req != PRU_SENDOOB && control)
    360 		panic("rip_usrreq: unexpected control mbuf");
    361 #endif
    362 	if (inp == 0 && req != PRU_ATTACH) {
    363 		error = EINVAL;
    364 		goto release;
    365 	}
    366 
    367 	switch (req) {
    368 
    369 	case PRU_ATTACH:
    370 		if (inp != 0) {
    371 			error = EISCONN;
    372 			break;
    373 		}
    374 		if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
    375 			error = EACCES;
    376 			break;
    377 		}
    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)
    385 			break;
    386 		inp = sotoinpcb(so);
    387 		inp->inp_ip.ip_p = (long)nam;
    388 		break;
    389 
    390 	case PRU_DETACH:
    391 #ifdef MROUTING
    392 		if (so == ip_mrouter)
    393 			ip_mrouter_done();
    394 #endif
    395 		in_pcbdetach(inp);
    396 		break;
    397 
    398 	case PRU_BIND:
    399 		error = rip_bind(inp, nam);
    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)
    409 			break;
    410 		soisconnected(so);
    411 		break;
    412 
    413 	case PRU_CONNECT2:
    414 		error = EOPNOTSUPP;
    415 		break;
    416 
    417 	case PRU_DISCONNECT:
    418 		soisdisconnected(so);
    419 		rip_disconnect(inp);
    420 		break;
    421 
    422 	/*
    423 	 * Mark the connection as being incapable of further input.
    424 	 */
    425 	case PRU_SHUTDOWN:
    426 		socantsendmore(so);
    427 		break;
    428 
    429 	case PRU_RCVD:
    430 		error = EOPNOTSUPP;
    431 		break;
    432 
    433 	/*
    434 	 * Ship a packet out.  The appropriate raw output
    435 	 * routine handles any massaging necessary.
    436 	 */
    437 	case PRU_SEND:
    438 		if (control && control->m_len) {
    439 			m_freem(control);
    440 			m_freem(m);
    441 			error = EINVAL;
    442 			break;
    443 		}
    444 	{
    445 		if (nam) {
    446 			if ((so->so_state & SS_ISCONNECTED) != 0) {
    447 				error = EISCONN;
    448 				goto die;
    449 			}
    450 			error = rip_connect(inp, nam);
    451 			if (error) {
    452 			die:
    453 				m_freem(m);
    454 				break;
    455 			}
    456 		} else {
    457 			if ((so->so_state & SS_ISCONNECTED) == 0) {
    458 				error = ENOTCONN;
    459 				goto die;
    460 			}
    461 		}
    462 		error = rip_output(m, inp);
    463 		if (nam)
    464 			rip_disconnect(inp);
    465 	}
    466 		break;
    467 
    468 	case PRU_SENSE:
    469 		/*
    470 		 * stat: don't bother with a blocksize.
    471 		 */
    472 		splx(s);
    473 		return (0);
    474 
    475 	case PRU_RCVOOB:
    476 		error = EOPNOTSUPP;
    477 		break;
    478 
    479 	case PRU_SENDOOB:
    480 		m_freem(control);
    481 		m_freem(m);
    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");
    495 	}
    496 
    497 release:
    498 	splx(s);
    499 	return (error);
    500 }
    501