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