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raw_ip.c revision 1.24 
      1 /*	$NetBSD: raw_ip.c,v 1.24 1996/02/13 23:43:29 christos 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 
     47 #include <net/if.h>
     48 #include <net/route.h>
     49 
     50 #include <netinet/in.h>
     51 #include <netinet/in_systm.h>
     52 #include <netinet/ip.h>
     53 #include <netinet/ip_var.h>
     54 #include <netinet/ip_mroute.h>
     55 #include <netinet/in_pcb.h>
     56 #include <netinet/in_var.h>
     57 
     58 #include <machine/stdarg.h>
     59 
     60 struct inpcbtable rawcbtable;
     61 
     62 /*
     63  * Nominal space allocated to a raw ip socket.
     64  */
     65 #define	RIPSNDQ		8192
     66 #define	RIPRCVQ		8192
     67 
     68 /*
     69  * Raw interface to IP protocol.
     70  */
     71 
     72 /*
     73  * Initialize raw connection block q.
     74  */
     75 void
     76 rip_init()
     77 {
     78 
     79 	in_pcbinit(&rawcbtable, 1);
     80 }
     81 
     82 struct	sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
     83 /*
     84  * Setup generic address and protocol structures
     85  * for raw_input routine, then pass them along with
     86  * mbuf chain.
     87  */
     88 void
     89 #if __STDC__
     90 rip_input(struct mbuf *m, ...)
     91 #else
     92 rip_input(m, va_alist)
     93 	struct mbuf *m;
     94 	va_dcl
     95 #endif
     96 {
     97 	register struct ip *ip = mtod(m, struct ip *);
     98 	register struct inpcb *inp;
     99 	struct socket *last = 0;
    100 
    101 	ripsrc.sin_addr = ip->ip_src;
    102 	for (inp = rawcbtable.inpt_queue.cqh_first;
    103 	    inp != (struct inpcb *)&rawcbtable.inpt_queue;
    104 	    inp = inp->inp_queue.cqe_next) {
    105 		if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p)
    106 			continue;
    107 		if (inp->inp_laddr.s_addr &&
    108 		    inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
    109 			continue;
    110 		if (inp->inp_faddr.s_addr &&
    111 		    inp->inp_faddr.s_addr != ip->ip_src.s_addr)
    112 			continue;
    113 		if (last) {
    114 			struct mbuf *n;
    115 			if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
    116 				if (sbappendaddr(&last->so_rcv,
    117 				    sintosa(&ripsrc), n,
    118 				    (struct mbuf *)0) == 0)
    119 					/* should notify about lost packet */
    120 					m_freem(n);
    121 				else
    122 					sorwakeup(last);
    123 			}
    124 		}
    125 		last = inp->inp_socket;
    126 	}
    127 	if (last) {
    128 		if (sbappendaddr(&last->so_rcv, sintosa(&ripsrc), m,
    129 		    (struct mbuf *)0) == 0)
    130 			m_freem(m);
    131 		else
    132 			sorwakeup(last);
    133 	} else {
    134 		m_freem(m);
    135 		ipstat.ips_noproto++;
    136 		ipstat.ips_delivered--;
    137 	}
    138 }
    139 
    140 /*
    141  * Generate IP header and pass packet to ip_output.
    142  * Tack on options user may have setup with control call.
    143  */
    144 int
    145 #if __STDC__
    146 rip_output(struct mbuf *m, ...)
    147 #else
    148 rip_output(m, va_alist)
    149 	struct mbuf *m;
    150 	va_dcl
    151 #endif
    152 {
    153 	struct socket *so;
    154 	u_long dst;
    155 	register struct ip *ip;
    156 	register struct inpcb *inp;
    157 	struct mbuf *opts;
    158 	int flags;
    159 	va_list ap;
    160 
    161 	va_start(ap, m);
    162 	so = va_arg(ap, struct socket *);
    163 	dst = va_arg(ap, u_long);
    164 	va_end(ap);
    165 
    166 	inp = sotoinpcb(so);
    167 	flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
    168 
    169 	/*
    170 	 * If the user handed us a complete IP packet, use it.
    171 	 * Otherwise, allocate an mbuf for a header and fill it in.
    172 	 */
    173 	if ((inp->inp_flags & INP_HDRINCL) == 0) {
    174 		M_PREPEND(m, sizeof(struct ip), M_WAIT);
    175 		ip = mtod(m, struct ip *);
    176 		ip->ip_tos = 0;
    177 		ip->ip_off = 0;
    178 		ip->ip_p = inp->inp_ip.ip_p;
    179 		ip->ip_len = m->m_pkthdr.len;
    180 		ip->ip_src = inp->inp_laddr;
    181 		ip->ip_dst.s_addr = dst;
    182 		ip->ip_ttl = MAXTTL;
    183 		opts = inp->inp_options;
    184 	} else {
    185 		ip = mtod(m, struct ip *);
    186 		if (ip->ip_id == 0)
    187 			ip->ip_id = htons(ip_id++);
    188 		opts = NULL;
    189 		/* XXX prevent ip_output from overwriting header fields */
    190 		flags |= IP_RAWOUTPUT;
    191 		ipstat.ips_rawout++;
    192 	}
    193 	return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions));
    194 }
    195 
    196 /*
    197  * Raw IP socket option processing.
    198  */
    199 int
    200 rip_ctloutput(op, so, level, optname, m)
    201 	int op;
    202 	struct socket *so;
    203 	int level, optname;
    204 	struct mbuf **m;
    205 {
    206 	register struct inpcb *inp = sotoinpcb(so);
    207 
    208 	if (level != IPPROTO_IP) {
    209 		if (m != 0 && *m != 0)
    210 			(void)m_free(*m);
    211 		return (EINVAL);
    212 	}
    213 
    214 	switch (optname) {
    215 
    216 	case IP_HDRINCL:
    217 		if (op == PRCO_SETOPT || op == PRCO_GETOPT) {
    218 			if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int))
    219 				return (EINVAL);
    220 			if (op == PRCO_SETOPT) {
    221 				if (*mtod(*m, int *))
    222 					inp->inp_flags |= INP_HDRINCL;
    223 				else
    224 					inp->inp_flags &= ~INP_HDRINCL;
    225 				(void)m_free(*m);
    226 			} else {
    227 				(*m)->m_len = sizeof (int);
    228 				*mtod(*m, int *) = inp->inp_flags & INP_HDRINCL;
    229 			}
    230 			return (0);
    231 		}
    232 		break;
    233 
    234 	case MRT_INIT:
    235 	case MRT_DONE:
    236 	case MRT_ADD_VIF:
    237 	case MRT_DEL_VIF:
    238 	case MRT_ADD_MFC:
    239 	case MRT_DEL_MFC:
    240 	case MRT_VERSION:
    241 	case MRT_ASSERT:
    242 #ifdef MROUTING
    243 		switch (op) {
    244 		case PRCO_SETOPT:
    245 			error = ip_mrouter_set(optname, so, m);
    246 			break;
    247 		case PRCO_GETOPT:
    248 			error = ip_mrouter_get(optname, so, m);
    249 			break;
    250 		default:
    251 			error = EINVAL;
    252 			break;
    253 		}
    254 		return (error);
    255 #else
    256 		if (op == PRCO_SETOPT && *m)
    257 			m_free(*m);
    258 		return (EOPNOTSUPP);
    259 #endif
    260 	}
    261 	return (ip_ctloutput(op, so, level, optname, m));
    262 }
    263 
    264 u_long	rip_sendspace = RIPSNDQ;
    265 u_long	rip_recvspace = RIPRCVQ;
    266 
    267 /*ARGSUSED*/
    268 int
    269 rip_usrreq(so, req, m, nam, control)
    270 	register struct socket *so;
    271 	int req;
    272 	struct mbuf *m, *nam, *control;
    273 {
    274 	register int error = 0;
    275 	register struct inpcb *inp = sotoinpcb(so);
    276 #ifdef MROUTING
    277 	extern struct socket *ip_mrouter;
    278 #endif
    279 	if (req == PRU_CONTROL)
    280 		return (in_control(so, (long)m, (caddr_t)nam,
    281 			(struct ifnet *)control));
    282 
    283 	if (inp == NULL && req != PRU_ATTACH) {
    284 		error = EINVAL;
    285 		goto release;
    286 	}
    287 
    288 	switch (req) {
    289 
    290 	case PRU_ATTACH:
    291 		if (inp)
    292 			panic("rip_attach");
    293 		if ((so->so_state & SS_PRIV) == 0) {
    294 			error = EACCES;
    295 			break;
    296 		}
    297 		if ((error = soreserve(so, rip_sendspace, rip_recvspace)) ||
    298 		    (error = in_pcballoc(so, &rawcbtable)))
    299 			break;
    300 		inp = (struct inpcb *)so->so_pcb;
    301 		inp->inp_ip.ip_p = (long)nam;
    302 		break;
    303 
    304 	case PRU_DISCONNECT:
    305 		if ((so->so_state & SS_ISCONNECTED) == 0) {
    306 			error = ENOTCONN;
    307 			break;
    308 		}
    309 		/* FALLTHROUGH */
    310 	case PRU_ABORT:
    311 		soisdisconnected(so);
    312 		/* FALLTHROUGH */
    313 	case PRU_DETACH:
    314 		if (inp == 0)
    315 			panic("rip_detach");
    316 #ifdef MROUTING
    317 		if (so == ip_mrouter)
    318 			ip_mrouter_done();
    319 #endif
    320 		in_pcbdetach(inp);
    321 		break;
    322 
    323 	case PRU_BIND:
    324 	    {
    325 		struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
    326 
    327 		if (nam->m_len != sizeof(*addr)) {
    328 			error = EINVAL;
    329 			break;
    330 		}
    331 		if ((ifnet.tqh_first == 0) ||
    332 		    ((addr->sin_family != AF_INET) &&
    333 		     (addr->sin_family != AF_IMPLINK)) ||
    334 		    (addr->sin_addr.s_addr &&
    335 		     ifa_ifwithaddr(sintosa(addr)) == 0)) {
    336 			error = EADDRNOTAVAIL;
    337 			break;
    338 		}
    339 		inp->inp_laddr = addr->sin_addr;
    340 		break;
    341 	    }
    342 	case PRU_CONNECT:
    343 	    {
    344 		struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
    345 
    346 		if (nam->m_len != sizeof(*addr)) {
    347 			error = EINVAL;
    348 			break;
    349 		}
    350 		if (ifnet.tqh_first == 0) {
    351 			error = EADDRNOTAVAIL;
    352 			break;
    353 		}
    354 		if ((addr->sin_family != AF_INET) &&
    355 		     (addr->sin_family != AF_IMPLINK)) {
    356 			error = EAFNOSUPPORT;
    357 			break;
    358 		}
    359 		inp->inp_faddr = addr->sin_addr;
    360 		soisconnected(so);
    361 		break;
    362 	    }
    363 
    364 	case PRU_CONNECT2:
    365 		error = EOPNOTSUPP;
    366 		break;
    367 
    368 	/*
    369 	 * Mark the connection as being incapable of further input.
    370 	 */
    371 	case PRU_SHUTDOWN:
    372 		socantsendmore(so);
    373 		break;
    374 
    375 	/*
    376 	 * Ship a packet out.  The appropriate raw output
    377 	 * routine handles any massaging necessary.
    378 	 */
    379 	case PRU_SEND:
    380 	    {
    381 		register u_int32_t dst;
    382 
    383 		if (so->so_state & SS_ISCONNECTED) {
    384 			if (nam) {
    385 				error = EISCONN;
    386 				break;
    387 			}
    388 			dst = inp->inp_faddr.s_addr;
    389 		} else {
    390 			if (nam == NULL) {
    391 				error = ENOTCONN;
    392 				break;
    393 			}
    394 			dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr;
    395 		}
    396 		error = rip_output(m, so, dst);
    397 		m = NULL;
    398 		break;
    399 	    }
    400 
    401 	case PRU_SENSE:
    402 		/*
    403 		 * stat: don't bother with a blocksize.
    404 		 */
    405 		return (0);
    406 
    407 	/*
    408 	 * Not supported.
    409 	 */
    410 	case PRU_RCVOOB:
    411 	case PRU_RCVD:
    412 	case PRU_LISTEN:
    413 	case PRU_ACCEPT:
    414 	case PRU_SENDOOB:
    415 		error = EOPNOTSUPP;
    416 		break;
    417 
    418 	case PRU_SOCKADDR:
    419 		in_setsockaddr(inp, nam);
    420 		break;
    421 
    422 	case PRU_PEERADDR:
    423 		in_setpeeraddr(inp, nam);
    424 		break;
    425 
    426 	default:
    427 		panic("rip_usrreq");
    428 	}
    429 release:
    430 	if (m != NULL)
    431 		m_freem(m);
    432 	return (error);
    433 }
    434