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raw_ip.c revision 1.25.4.1 
      1 /*	$NetBSD: raw_ip.c,v 1.25.4.1 1996/11/10 21:57:53 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 
     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 		if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) {
    175 			m_freem(m);
    176 			return (EMSGSIZE);
    177 		}
    178 		M_PREPEND(m, sizeof(struct ip), M_WAIT);
    179 		ip = mtod(m, struct ip *);
    180 		ip->ip_tos = 0;
    181 		ip->ip_off = 0;
    182 		ip->ip_p = inp->inp_ip.ip_p;
    183 		ip->ip_len = m->m_pkthdr.len;
    184 		ip->ip_src = inp->inp_laddr;
    185 		ip->ip_dst.s_addr = dst;
    186 		ip->ip_ttl = MAXTTL;
    187 		opts = inp->inp_options;
    188 	} else {
    189 		if (m->m_pkthdr.len > IP_MAXPACKET) {
    190 			m_freem(m);
    191 			return (EMSGSIZE);
    192 		}
    193 		ip = mtod(m, struct ip *);
    194 		if (ip->ip_id == 0)
    195 			ip->ip_id = htons(ip_id++);
    196 		opts = NULL;
    197 		/* XXX prevent ip_output from overwriting header fields */
    198 		flags |= IP_RAWOUTPUT;
    199 		ipstat.ips_rawout++;
    200 	}
    201 	return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions));
    202 }
    203 
    204 /*
    205  * Raw IP socket option processing.
    206  */
    207 int
    208 rip_ctloutput(op, so, level, optname, m)
    209 	int op;
    210 	struct socket *so;
    211 	int level, optname;
    212 	struct mbuf **m;
    213 {
    214 	register struct inpcb *inp = sotoinpcb(so);
    215 #ifdef MROUTING
    216 	int error;
    217 #endif
    218 
    219 	if (level != IPPROTO_IP) {
    220 		if (m != 0 && *m != 0)
    221 			(void)m_free(*m);
    222 		return (EINVAL);
    223 	}
    224 
    225 	switch (optname) {
    226 
    227 	case IP_HDRINCL:
    228 		if (op == PRCO_SETOPT || op == PRCO_GETOPT) {
    229 			if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int))
    230 				return (EINVAL);
    231 			if (op == PRCO_SETOPT) {
    232 				if (*mtod(*m, int *))
    233 					inp->inp_flags |= INP_HDRINCL;
    234 				else
    235 					inp->inp_flags &= ~INP_HDRINCL;
    236 				(void)m_free(*m);
    237 			} else {
    238 				(*m)->m_len = sizeof (int);
    239 				*mtod(*m, int *) = inp->inp_flags & INP_HDRINCL;
    240 			}
    241 			return (0);
    242 		}
    243 		break;
    244 
    245 	case MRT_INIT:
    246 	case MRT_DONE:
    247 	case MRT_ADD_VIF:
    248 	case MRT_DEL_VIF:
    249 	case MRT_ADD_MFC:
    250 	case MRT_DEL_MFC:
    251 	case MRT_VERSION:
    252 	case MRT_ASSERT:
    253 #ifdef MROUTING
    254 		switch (op) {
    255 		case PRCO_SETOPT:
    256 			error = ip_mrouter_set(optname, so, m);
    257 			break;
    258 		case PRCO_GETOPT:
    259 			error = ip_mrouter_get(optname, so, m);
    260 			break;
    261 		default:
    262 			error = EINVAL;
    263 			break;
    264 		}
    265 		return (error);
    266 #else
    267 		if (op == PRCO_SETOPT && *m)
    268 			m_free(*m);
    269 		return (EOPNOTSUPP);
    270 #endif
    271 	}
    272 	return (ip_ctloutput(op, so, level, optname, m));
    273 }
    274 
    275 u_long	rip_sendspace = RIPSNDQ;
    276 u_long	rip_recvspace = RIPRCVQ;
    277 
    278 /*ARGSUSED*/
    279 int
    280 rip_usrreq(so, req, m, nam, control)
    281 	register struct socket *so;
    282 	int req;
    283 	struct mbuf *m, *nam, *control;
    284 {
    285 	register int error = 0;
    286 	register struct inpcb *inp = sotoinpcb(so);
    287 #ifdef MROUTING
    288 	extern struct socket *ip_mrouter;
    289 #endif
    290 	if (req == PRU_CONTROL)
    291 		return (in_control(so, (long)m, (caddr_t)nam,
    292 			(struct ifnet *)control));
    293 
    294 	if (inp == NULL && req != PRU_ATTACH) {
    295 		error = EINVAL;
    296 		goto release;
    297 	}
    298 
    299 	switch (req) {
    300 
    301 	case PRU_ATTACH:
    302 		if (inp)
    303 			panic("rip_attach");
    304 		if ((so->so_state & SS_PRIV) == 0) {
    305 			error = EACCES;
    306 			break;
    307 		}
    308 		if ((error = soreserve(so, rip_sendspace, rip_recvspace)) ||
    309 		    (error = in_pcballoc(so, &rawcbtable)))
    310 			break;
    311 		inp = (struct inpcb *)so->so_pcb;
    312 		inp->inp_ip.ip_p = (long)nam;
    313 		break;
    314 
    315 	case PRU_DISCONNECT:
    316 		if ((so->so_state & SS_ISCONNECTED) == 0) {
    317 			error = ENOTCONN;
    318 			break;
    319 		}
    320 		/* FALLTHROUGH */
    321 	case PRU_ABORT:
    322 		soisdisconnected(so);
    323 		/* FALLTHROUGH */
    324 	case PRU_DETACH:
    325 		if (inp == 0)
    326 			panic("rip_detach");
    327 #ifdef MROUTING
    328 		if (so == ip_mrouter)
    329 			ip_mrouter_done();
    330 #endif
    331 		in_pcbdetach(inp);
    332 		break;
    333 
    334 	case PRU_BIND:
    335 	    {
    336 		struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
    337 
    338 		if (nam->m_len != sizeof(*addr)) {
    339 			error = EINVAL;
    340 			break;
    341 		}
    342 		if ((ifnet.tqh_first == 0) ||
    343 		    ((addr->sin_family != AF_INET) &&
    344 		     (addr->sin_family != AF_IMPLINK)) ||
    345 		    (addr->sin_addr.s_addr &&
    346 		     ifa_ifwithaddr(sintosa(addr)) == 0)) {
    347 			error = EADDRNOTAVAIL;
    348 			break;
    349 		}
    350 		inp->inp_laddr = addr->sin_addr;
    351 		break;
    352 	    }
    353 	case PRU_CONNECT:
    354 	    {
    355 		struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
    356 
    357 		if (nam->m_len != sizeof(*addr)) {
    358 			error = EINVAL;
    359 			break;
    360 		}
    361 		if (ifnet.tqh_first == 0) {
    362 			error = EADDRNOTAVAIL;
    363 			break;
    364 		}
    365 		if ((addr->sin_family != AF_INET) &&
    366 		     (addr->sin_family != AF_IMPLINK)) {
    367 			error = EAFNOSUPPORT;
    368 			break;
    369 		}
    370 		inp->inp_faddr = addr->sin_addr;
    371 		soisconnected(so);
    372 		break;
    373 	    }
    374 
    375 	case PRU_CONNECT2:
    376 		error = EOPNOTSUPP;
    377 		break;
    378 
    379 	/*
    380 	 * Mark the connection as being incapable of further input.
    381 	 */
    382 	case PRU_SHUTDOWN:
    383 		socantsendmore(so);
    384 		break;
    385 
    386 	/*
    387 	 * Ship a packet out.  The appropriate raw output
    388 	 * routine handles any massaging necessary.
    389 	 */
    390 	case PRU_SEND:
    391 	    {
    392 		register u_int32_t dst;
    393 
    394 		if (so->so_state & SS_ISCONNECTED) {
    395 			if (nam) {
    396 				error = EISCONN;
    397 				break;
    398 			}
    399 			dst = inp->inp_faddr.s_addr;
    400 		} else {
    401 			if (nam == NULL) {
    402 				error = ENOTCONN;
    403 				break;
    404 			}
    405 			dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr;
    406 		}
    407 		error = rip_output(m, so, dst);
    408 		m = NULL;
    409 		break;
    410 	    }
    411 
    412 	case PRU_SENSE:
    413 		/*
    414 		 * stat: don't bother with a blocksize.
    415 		 */
    416 		return (0);
    417 
    418 	/*
    419 	 * Not supported.
    420 	 */
    421 	case PRU_RCVOOB:
    422 	case PRU_RCVD:
    423 	case PRU_LISTEN:
    424 	case PRU_ACCEPT:
    425 	case PRU_SENDOOB:
    426 		error = EOPNOTSUPP;
    427 		break;
    428 
    429 	case PRU_SOCKADDR:
    430 		in_setsockaddr(inp, nam);
    431 		break;
    432 
    433 	case PRU_PEERADDR:
    434 		in_setpeeraddr(inp, nam);
    435 		break;
    436 
    437 	default:
    438 		panic("rip_usrreq");
    439 	}
    440 release:
    441 	if (m != NULL)
    442 		m_freem(m);
    443 	return (error);
    444 }
    445