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raw_ip.c revision 1.40 
      1 /*	$NetBSD: raw_ip.c,v 1.40 1998/01/12 03:02:53 scottr 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 			}
    141 		}
    142 		last = inp;
    143 	}
    144 	if (last) {
    145 		if (last->inp_flags & INP_CONTROLOPTS ||
    146 		    last->inp_socket->so_options & SO_TIMESTAMP)
    147 			ip_savecontrol(last, &opts, ip, m);
    148 		if (sbappendaddr(&last->inp_socket->so_rcv,
    149 		    sintosa(&ripsrc), m, opts) == 0) {
    150 			m_freem(m);
    151 			if (opts)
    152 				m_freem(opts);
    153 		} else
    154 			sorwakeup(last->inp_socket);
    155 	} else {
    156 		m_freem(m);
    157 		ipstat.ips_noproto++;
    158 		ipstat.ips_delivered--;
    159 	}
    160 }
    161 
    162 /*
    163  * Generate IP header and pass packet to ip_output.
    164  * Tack on options user may have setup with control call.
    165  */
    166 int
    167 #if __STDC__
    168 rip_output(struct mbuf *m, ...)
    169 #else
    170 rip_output(m, va_alist)
    171 	struct mbuf *m;
    172 	va_dcl
    173 #endif
    174 {
    175 	register struct inpcb *inp;
    176 	register struct ip *ip;
    177 	struct mbuf *opts;
    178 	int flags;
    179 	va_list ap;
    180 
    181 	va_start(ap, m);
    182 	inp = va_arg(ap, struct inpcb *);
    183 	va_end(ap);
    184 
    185 	flags =
    186 	    (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST
    187 	    | IP_RETURNMTU;
    188 
    189 	/*
    190 	 * If the user handed us a complete IP packet, use it.
    191 	 * Otherwise, allocate an mbuf for a header and fill it in.
    192 	 */
    193 	if ((inp->inp_flags & INP_HDRINCL) == 0) {
    194 		if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) {
    195 			m_freem(m);
    196 			return (EMSGSIZE);
    197 		}
    198 		M_PREPEND(m, sizeof(struct ip), M_WAIT);
    199 		ip = mtod(m, struct ip *);
    200 		ip->ip_tos = 0;
    201 		ip->ip_off = 0;
    202 		ip->ip_p = inp->inp_ip.ip_p;
    203 		ip->ip_len = m->m_pkthdr.len;
    204 		ip->ip_src = inp->inp_laddr;
    205 		ip->ip_dst = inp->inp_faddr;
    206 		ip->ip_ttl = MAXTTL;
    207 		opts = inp->inp_options;
    208 	} else {
    209 		if (m->m_pkthdr.len > IP_MAXPACKET) {
    210 			m_freem(m);
    211 			return (EMSGSIZE);
    212 		}
    213 		ip = mtod(m, struct ip *);
    214 		if (m->m_pkthdr.len != ip->ip_len) {
    215 			m_freem(m);
    216 			return (EINVAL);
    217 		}
    218 		if (ip->ip_id == 0)
    219 			ip->ip_id = htons(ip_id++);
    220 		opts = NULL;
    221 		/* XXX prevent ip_output from overwriting header fields */
    222 		flags |= IP_RAWOUTPUT;
    223 		ipstat.ips_rawout++;
    224 	}
    225 	return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions, &inp->inp_errormtu));
    226 }
    227 
    228 /*
    229  * Raw IP socket option processing.
    230  */
    231 int
    232 rip_ctloutput(op, so, level, optname, m)
    233 	int op;
    234 	struct socket *so;
    235 	int level, optname;
    236 	struct mbuf **m;
    237 {
    238 	register struct inpcb *inp = sotoinpcb(so);
    239 	int error = 0;
    240 
    241 	if (level != IPPROTO_IP) {
    242 		error = ENOPROTOOPT;
    243 		if (op == PRCO_SETOPT && *m != 0)
    244 			(void) m_free(*m);
    245 	} else switch (op) {
    246 
    247 	case PRCO_SETOPT:
    248 		switch (optname) {
    249 		case IP_HDRINCL:
    250 			if (*m == 0 || (*m)->m_len < sizeof (int))
    251 				error = EINVAL;
    252 			else {
    253 				if (*mtod(*m, int *))
    254 					inp->inp_flags |= INP_HDRINCL;
    255 				else
    256 					inp->inp_flags &= ~INP_HDRINCL;
    257 			}
    258 			if (*m != 0)
    259 				(void) m_free(*m);
    260 			break;
    261 
    262 #ifdef MROUTING
    263 		case MRT_INIT:
    264 		case MRT_DONE:
    265 		case MRT_ADD_VIF:
    266 		case MRT_DEL_VIF:
    267 		case MRT_ADD_MFC:
    268 		case MRT_DEL_MFC:
    269 		case MRT_ASSERT:
    270 			error = ip_mrouter_set(so, optname, m);
    271 			break;
    272 #endif
    273 
    274 		default:
    275 			error = ip_ctloutput(op, so, level, optname, m);
    276 			break;
    277 		}
    278 		break;
    279 
    280 	case PRCO_GETOPT:
    281 		switch (optname) {
    282 		case IP_HDRINCL:
    283 			*m = m_get(M_WAIT, M_SOOPTS);
    284 			(*m)->m_len = sizeof (int);
    285 			*mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0;
    286 			break;
    287 
    288 #ifdef MROUTING
    289 		case MRT_VERSION:
    290 		case MRT_ASSERT:
    291 			error = ip_mrouter_get(so, optname, m);
    292 			break;
    293 #endif
    294 
    295 		default:
    296 			error = ip_ctloutput(op, so, level, optname, m);
    297 			break;
    298 		}
    299 		break;
    300 	}
    301 	return (error);
    302 }
    303 
    304 int
    305 rip_bind(inp, nam)
    306 	struct inpcb *inp;
    307 	struct mbuf *nam;
    308 {
    309 	struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
    310 
    311 	if (nam->m_len != sizeof(*addr))
    312 		return (EINVAL);
    313 	if (ifnet.tqh_first == 0)
    314 		return (EADDRNOTAVAIL);
    315 	if (addr->sin_family != AF_INET &&
    316 	    addr->sin_family != AF_IMPLINK)
    317 		return (EAFNOSUPPORT);
    318 	if (!in_nullhost(addr->sin_addr) &&
    319 	    ifa_ifwithaddr(sintosa(addr)) == 0)
    320 		return (EADDRNOTAVAIL);
    321 	inp->inp_laddr = addr->sin_addr;
    322 	return (0);
    323 }
    324 
    325 int
    326 rip_connect(inp, nam)
    327 	struct inpcb *inp;
    328 	struct mbuf *nam;
    329 {
    330 	struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
    331 
    332 	if (nam->m_len != sizeof(*addr))
    333 		return (EINVAL);
    334 	if (ifnet.tqh_first == 0)
    335 		return (EADDRNOTAVAIL);
    336 	if (addr->sin_family != AF_INET &&
    337 	    addr->sin_family != AF_IMPLINK)
    338 		return (EAFNOSUPPORT);
    339 	inp->inp_faddr = addr->sin_addr;
    340 	return (0);
    341 }
    342 
    343 void
    344 rip_disconnect(inp)
    345 	struct inpcb *inp;
    346 {
    347 
    348 	inp->inp_faddr = zeroin_addr;
    349 }
    350 
    351 u_long	rip_sendspace = RIPSNDQ;
    352 u_long	rip_recvspace = RIPRCVQ;
    353 
    354 /*ARGSUSED*/
    355 int
    356 rip_usrreq(so, req, m, nam, control, p)
    357 	register struct socket *so;
    358 	int req;
    359 	struct mbuf *m, *nam, *control;
    360 	struct proc *p;
    361 {
    362 	register struct inpcb *inp;
    363 	int s;
    364 	register int error = 0;
    365 #ifdef MROUTING
    366 	extern struct socket *ip_mrouter;
    367 #endif
    368 
    369 	if (req == PRU_CONTROL)
    370 		return (in_control(so, (long)m, (caddr_t)nam,
    371 		    (struct ifnet *)control, p));
    372 
    373 	s = splsoftnet();
    374 	inp = sotoinpcb(so);
    375 #ifdef DIAGNOSTIC
    376 	if (req != PRU_SEND && req != PRU_SENDOOB && control)
    377 		panic("rip_usrreq: unexpected control mbuf");
    378 #endif
    379 	if (inp == 0 && req != PRU_ATTACH) {
    380 		error = EINVAL;
    381 		goto release;
    382 	}
    383 
    384 	switch (req) {
    385 
    386 	case PRU_ATTACH:
    387 		if (inp != 0) {
    388 			error = EISCONN;
    389 			break;
    390 		}
    391 		if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) {
    392 			error = EACCES;
    393 			break;
    394 		}
    395 		if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
    396 			error = soreserve(so, rip_sendspace, rip_recvspace);
    397 			if (error)
    398 				break;
    399 		}
    400 		error = in_pcballoc(so, &rawcbtable);
    401 		if (error)
    402 			break;
    403 		inp = sotoinpcb(so);
    404 		inp->inp_ip.ip_p = (long)nam;
    405 		break;
    406 
    407 	case PRU_DETACH:
    408 #ifdef MROUTING
    409 		if (so == ip_mrouter)
    410 			ip_mrouter_done();
    411 #endif
    412 		in_pcbdetach(inp);
    413 		break;
    414 
    415 	case PRU_BIND:
    416 		error = rip_bind(inp, nam);
    417 		break;
    418 
    419 	case PRU_LISTEN:
    420 		error = EOPNOTSUPP;
    421 		break;
    422 
    423 	case PRU_CONNECT:
    424 		error = rip_connect(inp, nam);
    425 		if (error)
    426 			break;
    427 		soisconnected(so);
    428 		break;
    429 
    430 	case PRU_CONNECT2:
    431 		error = EOPNOTSUPP;
    432 		break;
    433 
    434 	case PRU_DISCONNECT:
    435 		soisdisconnected(so);
    436 		rip_disconnect(inp);
    437 		break;
    438 
    439 	/*
    440 	 * Mark the connection as being incapable of further input.
    441 	 */
    442 	case PRU_SHUTDOWN:
    443 		socantsendmore(so);
    444 		break;
    445 
    446 	case PRU_RCVD:
    447 		error = EOPNOTSUPP;
    448 		break;
    449 
    450 	/*
    451 	 * Ship a packet out.  The appropriate raw output
    452 	 * routine handles any massaging necessary.
    453 	 */
    454 	case PRU_SEND:
    455 		if (control && control->m_len) {
    456 			m_freem(control);
    457 			m_freem(m);
    458 			error = EINVAL;
    459 			break;
    460 		}
    461 	{
    462 		if (nam) {
    463 			if ((so->so_state & SS_ISCONNECTED) != 0) {
    464 				error = EISCONN;
    465 				goto die;
    466 			}
    467 			error = rip_connect(inp, nam);
    468 			if (error) {
    469 			die:
    470 				m_freem(m);
    471 				break;
    472 			}
    473 		} else {
    474 			if ((so->so_state & SS_ISCONNECTED) == 0) {
    475 				error = ENOTCONN;
    476 				goto die;
    477 			}
    478 		}
    479 		error = rip_output(m, inp);
    480 		if (nam)
    481 			rip_disconnect(inp);
    482 	}
    483 		break;
    484 
    485 	case PRU_SENSE:
    486 		/*
    487 		 * stat: don't bother with a blocksize.
    488 		 */
    489 		splx(s);
    490 		return (0);
    491 
    492 	case PRU_RCVOOB:
    493 		error = EOPNOTSUPP;
    494 		break;
    495 
    496 	case PRU_SENDOOB:
    497 		m_freem(control);
    498 		m_freem(m);
    499 		error = EOPNOTSUPP;
    500 		break;
    501 
    502 	case PRU_SOCKADDR:
    503 		in_setsockaddr(inp, nam);
    504 		break;
    505 
    506 	case PRU_PEERADDR:
    507 		in_setpeeraddr(inp, nam);
    508 		break;
    509 
    510 	default:
    511 		panic("rip_usrreq");
    512 	}
    513 
    514 release:
    515 	splx(s);
    516 	return (error);
    517 }
    518