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raw_ip.c revision 1.42 
      1 /*	$NetBSD: raw_ip.c,v 1.42 1999/01/30 21:43:16 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 	/*
    116 	 * XXX Compatibility: programs using raw IP expect ip_len
    117 	 * XXX to have the header length subtracted.
    118 	 */
    119 	ip->ip_len -= ip->ip_hl << 2;
    120 
    121 	for (inp = rawcbtable.inpt_queue.cqh_first;
    122 	    inp != (struct inpcb *)&rawcbtable.inpt_queue;
    123 	    inp = inp->inp_queue.cqe_next) {
    124 		if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
    125 			continue;
    126 		if (!in_nullhost(inp->inp_laddr) &&
    127 		    !in_hosteq(inp->inp_laddr, ip->ip_dst))
    128 			continue;
    129 		if (!in_nullhost(inp->inp_faddr) &&
    130 		    !in_hosteq(inp->inp_faddr, ip->ip_src))
    131 			continue;
    132 		if (last) {
    133 			struct mbuf *n;
    134 			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
    135 				if (last->inp_flags & INP_CONTROLOPTS ||
    136 				    last->inp_socket->so_options & SO_TIMESTAMP)
    137 					ip_savecontrol(last, &opts, ip, n);
    138 				if (sbappendaddr(&last->inp_socket->so_rcv,
    139 				    sintosa(&ripsrc), n, opts) == 0) {
    140 					/* should notify about lost packet */
    141 					m_freem(n);
    142 					if (opts)
    143 						m_freem(opts);
    144 				} else
    145 					sorwakeup(last->inp_socket);
    146 				opts = NULL;
    147 			}
    148 		}
    149 		last = inp;
    150 	}
    151 	if (last) {
    152 		if (last->inp_flags & INP_CONTROLOPTS ||
    153 		    last->inp_socket->so_options & SO_TIMESTAMP)
    154 			ip_savecontrol(last, &opts, ip, m);
    155 		if (sbappendaddr(&last->inp_socket->so_rcv,
    156 		    sintosa(&ripsrc), m, opts) == 0) {
    157 			m_freem(m);
    158 			if (opts)
    159 				m_freem(opts);
    160 		} else
    161 			sorwakeup(last->inp_socket);
    162 	} else {
    163 		m_freem(m);
    164 		ipstat.ips_noproto++;
    165 		ipstat.ips_delivered--;
    166 	}
    167 }
    168 
    169 /*
    170  * Generate IP header and pass packet to ip_output.
    171  * Tack on options user may have setup with control call.
    172  */
    173 int
    174 #if __STDC__
    175 rip_output(struct mbuf *m, ...)
    176 #else
    177 rip_output(m, va_alist)
    178 	struct mbuf *m;
    179 	va_dcl
    180 #endif
    181 {
    182 	register struct inpcb *inp;
    183 	register struct ip *ip;
    184 	struct mbuf *opts;
    185 	int flags;
    186 	va_list ap;
    187 
    188 	va_start(ap, m);
    189 	inp = va_arg(ap, struct inpcb *);
    190 	va_end(ap);
    191 
    192 	flags =
    193 	    (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST
    194 	    | IP_RETURNMTU;
    195 
    196 	/*
    197 	 * If the user handed us a complete IP packet, use it.
    198 	 * Otherwise, allocate an mbuf for a header and fill it in.
    199 	 */
    200 	if ((inp->inp_flags & INP_HDRINCL) == 0) {
    201 		if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) {
    202 			m_freem(m);
    203 			return (EMSGSIZE);
    204 		}
    205 		M_PREPEND(m, sizeof(struct ip), M_WAIT);
    206 		ip = mtod(m, struct ip *);
    207 		ip->ip_tos = 0;
    208 		ip->ip_off = 0;
    209 		ip->ip_p = inp->inp_ip.ip_p;
    210 		ip->ip_len = m->m_pkthdr.len;
    211 		ip->ip_src = inp->inp_laddr;
    212 		ip->ip_dst = inp->inp_faddr;
    213 		ip->ip_ttl = MAXTTL;
    214 		opts = inp->inp_options;
    215 	} else {
    216 		if (m->m_pkthdr.len > IP_MAXPACKET) {
    217 			m_freem(m);
    218 			return (EMSGSIZE);
    219 		}
    220 		ip = mtod(m, struct ip *);
    221 		if (m->m_pkthdr.len != ip->ip_len) {
    222 			m_freem(m);
    223 			return (EINVAL);
    224 		}
    225 		if (ip->ip_id == 0)
    226 			ip->ip_id = htons(ip_id++);
    227 		opts = NULL;
    228 		/* XXX prevent ip_output from overwriting header fields */
    229 		flags |= IP_RAWOUTPUT;
    230 		ipstat.ips_rawout++;
    231 	}
    232 	return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions, &inp->inp_errormtu));
    233 }
    234 
    235 /*
    236  * Raw IP socket option processing.
    237  */
    238 int
    239 rip_ctloutput(op, so, level, optname, m)
    240 	int op;
    241 	struct socket *so;
    242 	int level, optname;
    243 	struct mbuf **m;
    244 {
    245 	register struct inpcb *inp = sotoinpcb(so);
    246 	int error = 0;
    247 
    248 	if (level != IPPROTO_IP) {
    249 		error = ENOPROTOOPT;
    250 		if (op == PRCO_SETOPT && *m != 0)
    251 			(void) m_free(*m);
    252 	} else switch (op) {
    253 
    254 	case PRCO_SETOPT:
    255 		switch (optname) {
    256 		case IP_HDRINCL:
    257 			if (*m == 0 || (*m)->m_len < sizeof (int))
    258 				error = EINVAL;
    259 			else {
    260 				if (*mtod(*m, int *))
    261 					inp->inp_flags |= INP_HDRINCL;
    262 				else
    263 					inp->inp_flags &= ~INP_HDRINCL;
    264 			}
    265 			if (*m != 0)
    266 				(void) m_free(*m);
    267 			break;
    268 
    269 #ifdef MROUTING
    270 		case MRT_INIT:
    271 		case MRT_DONE:
    272 		case MRT_ADD_VIF:
    273 		case MRT_DEL_VIF:
    274 		case MRT_ADD_MFC:
    275 		case MRT_DEL_MFC:
    276 		case MRT_ASSERT:
    277 			error = ip_mrouter_set(so, optname, m);
    278 			break;
    279 #endif
    280 
    281 		default:
    282 			error = ip_ctloutput(op, so, level, optname, m);
    283 			break;
    284 		}
    285 		break;
    286 
    287 	case PRCO_GETOPT:
    288 		switch (optname) {
    289 		case IP_HDRINCL:
    290 			*m = m_get(M_WAIT, M_SOOPTS);
    291 			(*m)->m_len = sizeof (int);
    292 			*mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0;
    293 			break;
    294 
    295 #ifdef MROUTING
    296 		case MRT_VERSION:
    297 		case MRT_ASSERT:
    298 			error = ip_mrouter_get(so, optname, m);
    299 			break;
    300 #endif
    301 
    302 		default:
    303 			error = ip_ctloutput(op, so, level, optname, m);
    304 			break;
    305 		}
    306 		break;
    307 	}
    308 	return (error);
    309 }
    310 
    311 int
    312 rip_bind(inp, nam)
    313 	struct inpcb *inp;
    314 	struct mbuf *nam;
    315 {
    316 	struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
    317 
    318 	if (nam->m_len != sizeof(*addr))
    319 		return (EINVAL);
    320 	if (ifnet.tqh_first == 0)
    321 		return (EADDRNOTAVAIL);
    322 	if (addr->sin_family != AF_INET &&
    323 	    addr->sin_family != AF_IMPLINK)
    324 		return (EAFNOSUPPORT);
    325 	if (!in_nullhost(addr->sin_addr) &&
    326 	    ifa_ifwithaddr(sintosa(addr)) == 0)
    327 		return (EADDRNOTAVAIL);
    328 	inp->inp_laddr = addr->sin_addr;
    329 	return (0);
    330 }
    331 
    332 int
    333 rip_connect(inp, nam)
    334 	struct inpcb *inp;
    335 	struct mbuf *nam;
    336 {
    337 	struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
    338 
    339 	if (nam->m_len != sizeof(*addr))
    340 		return (EINVAL);
    341 	if (ifnet.tqh_first == 0)
    342 		return (EADDRNOTAVAIL);
    343 	if (addr->sin_family != AF_INET &&
    344 	    addr->sin_family != AF_IMPLINK)
    345 		return (EAFNOSUPPORT);
    346 	inp->inp_faddr = addr->sin_addr;
    347 	return (0);
    348 }
    349 
    350 void
    351 rip_disconnect(inp)
    352 	struct inpcb *inp;
    353 {
    354 
    355 	inp->inp_faddr = zeroin_addr;
    356 }
    357 
    358 u_long	rip_sendspace = RIPSNDQ;
    359 u_long	rip_recvspace = RIPRCVQ;
    360 
    361 /*ARGSUSED*/
    362 int
    363 rip_usrreq(so, req, m, nam, control, p)
    364 	register struct socket *so;
    365 	int req;
    366 	struct mbuf *m, *nam, *control;
    367 	struct proc *p;
    368 {
    369 	register struct inpcb *inp;
    370 	int s;
    371 	register int error = 0;
    372 #ifdef MROUTING
    373 	extern struct socket *ip_mrouter;
    374 #endif
    375 
    376 	if (req == PRU_CONTROL)
    377 		return (in_control(so, (long)m, (caddr_t)nam,
    378 		    (struct ifnet *)control, p));
    379 
    380 	s = splsoftnet();
    381 	inp = sotoinpcb(so);
    382 #ifdef DIAGNOSTIC
    383 	if (req != PRU_SEND && req != PRU_SENDOOB && control)
    384 		panic("rip_usrreq: unexpected control mbuf");
    385 #endif
    386 	if (inp == 0 && req != PRU_ATTACH) {
    387 		error = EINVAL;
    388 		goto release;
    389 	}
    390 
    391 	switch (req) {
    392 
    393 	case PRU_ATTACH:
    394 		if (inp != 0) {
    395 			error = EISCONN;
    396 			break;
    397 		}
    398 		if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
    399 			error = EACCES;
    400 			break;
    401 		}
    402 		if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
    403 			error = soreserve(so, rip_sendspace, rip_recvspace);
    404 			if (error)
    405 				break;
    406 		}
    407 		error = in_pcballoc(so, &rawcbtable);
    408 		if (error)
    409 			break;
    410 		inp = sotoinpcb(so);
    411 		inp->inp_ip.ip_p = (long)nam;
    412 		break;
    413 
    414 	case PRU_DETACH:
    415 #ifdef MROUTING
    416 		if (so == ip_mrouter)
    417 			ip_mrouter_done();
    418 #endif
    419 		in_pcbdetach(inp);
    420 		break;
    421 
    422 	case PRU_BIND:
    423 		error = rip_bind(inp, nam);
    424 		break;
    425 
    426 	case PRU_LISTEN:
    427 		error = EOPNOTSUPP;
    428 		break;
    429 
    430 	case PRU_CONNECT:
    431 		error = rip_connect(inp, nam);
    432 		if (error)
    433 			break;
    434 		soisconnected(so);
    435 		break;
    436 
    437 	case PRU_CONNECT2:
    438 		error = EOPNOTSUPP;
    439 		break;
    440 
    441 	case PRU_DISCONNECT:
    442 		soisdisconnected(so);
    443 		rip_disconnect(inp);
    444 		break;
    445 
    446 	/*
    447 	 * Mark the connection as being incapable of further input.
    448 	 */
    449 	case PRU_SHUTDOWN:
    450 		socantsendmore(so);
    451 		break;
    452 
    453 	case PRU_RCVD:
    454 		error = EOPNOTSUPP;
    455 		break;
    456 
    457 	/*
    458 	 * Ship a packet out.  The appropriate raw output
    459 	 * routine handles any massaging necessary.
    460 	 */
    461 	case PRU_SEND:
    462 		if (control && control->m_len) {
    463 			m_freem(control);
    464 			m_freem(m);
    465 			error = EINVAL;
    466 			break;
    467 		}
    468 	{
    469 		if (nam) {
    470 			if ((so->so_state & SS_ISCONNECTED) != 0) {
    471 				error = EISCONN;
    472 				goto die;
    473 			}
    474 			error = rip_connect(inp, nam);
    475 			if (error) {
    476 			die:
    477 				m_freem(m);
    478 				break;
    479 			}
    480 		} else {
    481 			if ((so->so_state & SS_ISCONNECTED) == 0) {
    482 				error = ENOTCONN;
    483 				goto die;
    484 			}
    485 		}
    486 		error = rip_output(m, inp);
    487 		if (nam)
    488 			rip_disconnect(inp);
    489 	}
    490 		break;
    491 
    492 	case PRU_SENSE:
    493 		/*
    494 		 * stat: don't bother with a blocksize.
    495 		 */
    496 		splx(s);
    497 		return (0);
    498 
    499 	case PRU_RCVOOB:
    500 		error = EOPNOTSUPP;
    501 		break;
    502 
    503 	case PRU_SENDOOB:
    504 		m_freem(control);
    505 		m_freem(m);
    506 		error = EOPNOTSUPP;
    507 		break;
    508 
    509 	case PRU_SOCKADDR:
    510 		in_setsockaddr(inp, nam);
    511 		break;
    512 
    513 	case PRU_PEERADDR:
    514 		in_setpeeraddr(inp, nam);
    515 		break;
    516 
    517 	default:
    518 		panic("rip_usrreq");
    519 	}
    520 
    521 release:
    522 	splx(s);
    523 	return (error);
    524 }
    525