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ddp_input.c revision 1.17 
      1 /*	$NetBSD: ddp_input.c,v 1.17 2007/12/21 02:46:37 dyoung Exp $	 */
      2 
      3 /*
      4  * Copyright (c) 1990,1994 Regents of The University of Michigan.
      5  * All Rights Reserved.
      6  *
      7  * Permission to use, copy, modify, and distribute this software and
      8  * its documentation for any purpose and without fee is hereby granted,
      9  * provided that the above copyright notice appears in all copies and
     10  * that both that copyright notice and this permission notice appear
     11  * in supporting documentation, and that the name of The University
     12  * of Michigan not be used in advertising or publicity pertaining to
     13  * distribution of the software without specific, written prior
     14  * permission. This software is supplied as is without expressed or
     15  * implied warranties of any kind.
     16  *
     17  * This product includes software developed by the University of
     18  * California, Berkeley and its contributors.
     19  *
     20  *	Research Systems Unix Group
     21  *	The University of Michigan
     22  *	c/o Wesley Craig
     23  *	535 W. William Street
     24  *	Ann Arbor, Michigan
     25  *	+1-313-764-2278
     26  *	netatalk (at) umich.edu
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: ddp_input.c,v 1.17 2007/12/21 02:46:37 dyoung Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/systm.h>
     34 #include <sys/kernel.h>
     35 #include <net/netisr.h>
     36 #include <sys/mbuf.h>
     37 #include <sys/socket.h>
     38 #include <sys/socketvar.h>
     39 #include <sys/syslog.h>
     40 #include <net/if.h>
     41 #include <net/route.h>
     42 #include <net/if_ether.h>
     43 #include <netinet/in.h>
     44 
     45 #include <netatalk/at.h>
     46 #include <netatalk/at_var.h>
     47 #include <netatalk/ddp.h>
     48 #include <netatalk/ddp_var.h>
     49 #include <netatalk/at_extern.h>
     50 
     51 int             ddp_forward = 1;
     52 int             ddp_firewall = 0;
     53 extern int      ddp_cksum;
     54 void            ddp_input __P((struct mbuf *, struct ifnet *,
     55     struct elaphdr *, int));
     56 
     57 /*
     58  * Could probably merge these two code segments a little better...
     59  */
     60 void
     61 atintr()
     62 {
     63 	struct elaphdr *elhp, elh;
     64 	struct ifnet   *ifp;
     65 	struct mbuf    *m;
     66 	struct at_ifaddr *aa;
     67 	int             s;
     68 
     69 	for (;;) {
     70 		s = splnet();
     71 
     72 		IF_DEQUEUE(&atintrq2, m);
     73 
     74 		splx(s);
     75 
     76 		if (m == 0)	/* no more queued packets */
     77 			break;
     78 
     79 		m_claimm(m, &atalk_rx_mowner);
     80 		ifp = m->m_pkthdr.rcvif;
     81 		for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next) {
     82 			if (aa->aa_ifp == ifp && (aa->aa_flags & AFA_PHASE2))
     83 				break;
     84 		}
     85 		if (aa == NULL) {	/* ifp not an appletalk interface */
     86 			m_freem(m);
     87 			continue;
     88 		}
     89 		ddp_input(m, ifp, (struct elaphdr *) NULL, 2);
     90 	}
     91 
     92 	for (;;) {
     93 		s = splnet();
     94 
     95 		IF_DEQUEUE(&atintrq1, m);
     96 
     97 		splx(s);
     98 
     99 		if (m == 0)	/* no more queued packets */
    100 
    101 			break;
    102 
    103 		m_claimm(m, &atalk_rx_mowner);
    104 		ifp = m->m_pkthdr.rcvif;
    105 		for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next) {
    106 			if (aa->aa_ifp == ifp &&
    107 			    (aa->aa_flags & AFA_PHASE2) == 0)
    108 				break;
    109 		}
    110 		if (aa == NULL) {	/* ifp not an appletalk interface */
    111 			m_freem(m);
    112 			continue;
    113 		}
    114 		if (m->m_len < SZ_ELAPHDR &&
    115 		    ((m = m_pullup(m, SZ_ELAPHDR)) == 0)) {
    116 			ddpstat.ddps_tooshort++;
    117 			continue;
    118 		}
    119 		elhp = mtod(m, struct elaphdr *);
    120 		m_adj(m, SZ_ELAPHDR);
    121 
    122 		if (elhp->el_type == ELAP_DDPEXTEND) {
    123 			ddp_input(m, ifp, (struct elaphdr *) NULL, 1);
    124 		} else {
    125 			bcopy((void *) elhp, (void *) & elh, SZ_ELAPHDR);
    126 			ddp_input(m, ifp, &elh, 1);
    127 		}
    128 	}
    129 }
    130 
    131 struct route    forwro;
    132 
    133 void
    134 ddp_input(m, ifp, elh, phase)
    135 	struct mbuf    *m;
    136 	struct ifnet   *ifp;
    137 	struct elaphdr *elh;
    138 	int             phase;
    139 {
    140 	struct rtentry *rt;
    141 	struct sockaddr_at from, to;
    142 	struct ddpshdr *dsh, ddps;
    143 	struct at_ifaddr *aa;
    144 	struct ddpehdr *deh = NULL, ddpe;
    145 	struct ddpcb   *ddp;
    146 	int             dlen, mlen;
    147 	u_short         cksum = 0;
    148 	union {
    149 		struct sockaddr		dst;
    150 		struct sockaddr_at	dsta;
    151 	} u;
    152 
    153 	bzero((void *) & from, sizeof(struct sockaddr_at));
    154 	if (elh) {
    155 		ddpstat.ddps_short++;
    156 
    157 		if (m->m_len < sizeof(struct ddpshdr) &&
    158 		    ((m = m_pullup(m, sizeof(struct ddpshdr))) == 0)) {
    159 			ddpstat.ddps_tooshort++;
    160 			return;
    161 		}
    162 		dsh = mtod(m, struct ddpshdr *);
    163 		bcopy((void *) dsh, (void *) & ddps, sizeof(struct ddpshdr));
    164 		ddps.dsh_bytes = ntohl(ddps.dsh_bytes);
    165 		dlen = ddps.dsh_len;
    166 
    167 		to.sat_addr.s_net = ATADDR_ANYNET;
    168 		to.sat_addr.s_node = elh->el_dnode;
    169 		to.sat_port = ddps.dsh_dport;
    170 		from.sat_addr.s_net = ATADDR_ANYNET;
    171 		from.sat_addr.s_node = elh->el_snode;
    172 		from.sat_port = ddps.dsh_sport;
    173 
    174 		for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next) {
    175 			if (aa->aa_ifp == ifp &&
    176 			    (aa->aa_flags & AFA_PHASE2) == 0 &&
    177 			    (AA_SAT(aa)->sat_addr.s_node ==
    178 			     to.sat_addr.s_node ||
    179 			     to.sat_addr.s_node == ATADDR_BCAST))
    180 				break;
    181 		}
    182 		if (aa == NULL) {
    183 			m_freem(m);
    184 			return;
    185 		}
    186 	} else {
    187 		ddpstat.ddps_long++;
    188 
    189 		if (m->m_len < sizeof(struct ddpehdr) &&
    190 		    ((m = m_pullup(m, sizeof(struct ddpehdr))) == 0)) {
    191 			ddpstat.ddps_tooshort++;
    192 			return;
    193 		}
    194 		deh = mtod(m, struct ddpehdr *);
    195 		bcopy((void *) deh, (void *) & ddpe, sizeof(struct ddpehdr));
    196 		ddpe.deh_bytes = ntohl(ddpe.deh_bytes);
    197 		dlen = ddpe.deh_len;
    198 
    199 		if ((cksum = ddpe.deh_sum) == 0) {
    200 			ddpstat.ddps_nosum++;
    201 		}
    202 		from.sat_addr.s_net = ddpe.deh_snet;
    203 		from.sat_addr.s_node = ddpe.deh_snode;
    204 		from.sat_port = ddpe.deh_sport;
    205 		to.sat_addr.s_net = ddpe.deh_dnet;
    206 		to.sat_addr.s_node = ddpe.deh_dnode;
    207 		to.sat_port = ddpe.deh_dport;
    208 
    209 		if (to.sat_addr.s_net == ATADDR_ANYNET) {
    210 			for (aa = at_ifaddr.tqh_first; aa;
    211 			    aa = aa->aa_list.tqe_next) {
    212 				if (phase == 1 && (aa->aa_flags & AFA_PHASE2))
    213 					continue;
    214 
    215 				if (phase == 2 &&
    216 				    (aa->aa_flags & AFA_PHASE2) == 0)
    217 					continue;
    218 
    219 				if (aa->aa_ifp == ifp &&
    220 				    (AA_SAT(aa)->sat_addr.s_node ==
    221 				     to.sat_addr.s_node ||
    222 				     to.sat_addr.s_node == ATADDR_BCAST ||
    223 				     (ifp->if_flags & IFF_LOOPBACK)))
    224 					break;
    225 			}
    226 		} else {
    227 			for (aa = at_ifaddr.tqh_first; aa;
    228 			    aa = aa->aa_list.tqe_next) {
    229 				if (to.sat_addr.s_net == aa->aa_firstnet &&
    230 				    to.sat_addr.s_node == 0)
    231 					break;
    232 
    233 				if ((ntohs(to.sat_addr.s_net) <
    234 				     ntohs(aa->aa_firstnet) ||
    235 				     ntohs(to.sat_addr.s_net) >
    236 				     ntohs(aa->aa_lastnet)) &&
    237 				    (ntohs(to.sat_addr.s_net) < 0xff00 ||
    238 				     ntohs(to.sat_addr.s_net) > 0xfffe))
    239 					continue;
    240 
    241 				if (to.sat_addr.s_node !=
    242 				    AA_SAT(aa)->sat_addr.s_node &&
    243 				    to.sat_addr.s_node != ATADDR_BCAST)
    244 					continue;
    245 
    246 				break;
    247 			}
    248 		}
    249 	}
    250 
    251 	/*
    252          * Adjust the length, removing any padding that may have been added
    253          * at a link layer.  We do this before we attempt to forward a packet,
    254          * possibly on a different media.
    255          */
    256 	mlen = m->m_pkthdr.len;
    257 	if (mlen < dlen) {
    258 		ddpstat.ddps_toosmall++;
    259 		m_freem(m);
    260 		return;
    261 	}
    262 	if (mlen > dlen) {
    263 		m_adj(m, dlen - mlen);
    264 	}
    265 	/*
    266          * XXX Should we deliver broadcasts locally, also, or rely on the
    267          * link layer to give us a copy?  For the moment, the latter.
    268          */
    269 	if (aa == NULL || (to.sat_addr.s_node == ATADDR_BCAST &&
    270 		aa->aa_ifp != ifp && (ifp->if_flags & IFF_LOOPBACK) == 0)) {
    271 		if (ddp_forward == 0) {
    272 			m_freem(m);
    273 			return;
    274 		}
    275 		sockaddr_at_init(&u.dsta, &to.sat_addr, 0);
    276 		rt = rtcache_lookup(&forwro, &u.dst);
    277 #if 0		/* XXX The if-condition is always false.  What was this
    278 		 * actually trying to test?
    279 		 */
    280 		if (to.sat_addr.s_net !=
    281 		    satocsat(rtcache_getdst(&forwro))->sat_addr.s_net &&
    282 		    ddpe.deh_hops == DDP_MAXHOPS) {
    283 			m_freem(m);
    284 			return;
    285 		}
    286 #endif
    287 		if (ddp_firewall && (rt == NULL || rt->rt_ifp != ifp)) {
    288 			m_freem(m);
    289 			return;
    290 		}
    291 		ddpe.deh_hops++;
    292 		ddpe.deh_bytes = htonl(ddpe.deh_bytes);
    293 		bcopy((void *) & ddpe, (void *) deh, sizeof(u_short));/*XXX*/
    294 		if (ddp_route(m, &forwro)) {
    295 			ddpstat.ddps_cantforward++;
    296 		} else {
    297 			ddpstat.ddps_forward++;
    298 		}
    299 		return;
    300 	}
    301 	from.sat_len = sizeof(struct sockaddr_at);
    302 	from.sat_family = AF_APPLETALK;
    303 
    304 	if (elh) {
    305 		m_adj(m, sizeof(struct ddpshdr));
    306 	} else {
    307 		if (ddp_cksum && cksum && cksum != at_cksum(m, sizeof(int))) {
    308 			ddpstat.ddps_badsum++;
    309 			m_freem(m);
    310 			return;
    311 		}
    312 		m_adj(m, sizeof(struct ddpehdr));
    313 	}
    314 
    315 	if ((ddp = ddp_search(&from, &to, aa)) == NULL) {
    316 		m_freem(m);
    317 		return;
    318 	}
    319 	if (sbappendaddr(&ddp->ddp_socket->so_rcv, (struct sockaddr *) & from,
    320 			 m, (struct mbuf *) 0) == 0) {
    321 		ddpstat.ddps_nosockspace++;
    322 		m_freem(m);
    323 		return;
    324 	}
    325 #if IFA_STATS
    326 	if (aa)
    327 		aa->aa_ifa.ifa_data.ifad_inbytes += dlen;
    328 #endif
    329 	sorwakeup(ddp->ddp_socket);
    330 }
    331 
    332 #if 0
    333 
    334 #define BPXLEN	48
    335 #define BPALEN	16
    336 #include <ctype.h>
    337 
    338 static void
    339 bprint(data, len)
    340 	char *data;
    341 	int len;
    342 {
    343 	char            xout[BPXLEN], aout[BPALEN];
    344 	int             i = 0;
    345 
    346 	bzero(xout, BPXLEN);
    347 	bzero(aout, BPALEN);
    348 
    349 	for (;;) {
    350 		if (len < 1) {
    351 			if (i != 0) {
    352 				printf("%s\t%s\n", xout, aout);
    353 			}
    354 			printf("%s\n", "(end)");
    355 			break;
    356 		}
    357 		xout[(i * 3)] = hexdigits[(*data & 0xf0) >> 4];
    358 		xout[(i * 3) + 1] = hexdigits[*data & 0x0f];
    359 
    360 		if ((u_char) * data < 0x7f && (u_char) * data > 0x20) {
    361 			aout[i] = *data;
    362 		} else {
    363 			aout[i] = '.';
    364 		}
    365 
    366 		xout[(i * 3) + 2] = ' ';
    367 
    368 		i++;
    369 		len--;
    370 		data++;
    371 
    372 		if (i > BPALEN - 2) {
    373 			printf("%s\t%s\n", xout, aout);
    374 			bzero(xout, BPXLEN);
    375 			bzero(aout, BPALEN);
    376 			i = 0;
    377 			continue;
    378 		}
    379 	}
    380 }
    381 
    382 static void
    383 m_printm(m)
    384 	struct mbuf *m;
    385 {
    386 	for (; m; m = m->m_next)
    387 		bprint(mtod(m, char *), m->m_len);
    388 }
    389 #endif
    390