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ddp_input.c revision 1.22 
      1 /*	$NetBSD: ddp_input.c,v 1.22 2009/03/15 21:24:24 cegger 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 1.22 2009/03/15 21:24:24 cegger 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/ddp_private.h>
     50 #include <netatalk/at_extern.h>
     51 
     52 int             ddp_forward = 1;
     53 int             ddp_firewall = 0;
     54 extern int      ddp_cksum;
     55 void            ddp_input(struct mbuf *, struct ifnet *,
     56     struct elaphdr *, int);
     57 
     58 /*
     59  * Could probably merge these two code segments a little better...
     60  */
     61 void
     62 atintr(void)
     63 {
     64 	struct elaphdr *elhp, elh;
     65 	struct ifnet   *ifp;
     66 	struct mbuf    *m;
     67 	struct at_ifaddr *aa;
     68 	int             s;
     69 
     70 	mutex_enter(softnet_lock);
     71 	for (;;) {
     72 		s = splnet();
     73 
     74 		IF_DEQUEUE(&atintrq2, m);
     75 
     76 		splx(s);
     77 
     78 		if (m == 0)	/* no more queued packets */
     79 			break;
     80 
     81 		m_claimm(m, &atalk_rx_mowner);
     82 		ifp = m->m_pkthdr.rcvif;
     83 		for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next) {
     84 			if (aa->aa_ifp == ifp && (aa->aa_flags & AFA_PHASE2))
     85 				break;
     86 		}
     87 		if (aa == NULL) {	/* ifp not an appletalk interface */
     88 			m_freem(m);
     89 			continue;
     90 		}
     91 		ddp_input(m, ifp, (struct elaphdr *) NULL, 2);
     92 	}
     93 
     94 	for (;;) {
     95 		s = splnet();
     96 
     97 		IF_DEQUEUE(&atintrq1, m);
     98 
     99 		splx(s);
    100 
    101 		if (m == 0)	/* no more queued packets */
    102 
    103 			break;
    104 
    105 		m_claimm(m, &atalk_rx_mowner);
    106 		ifp = m->m_pkthdr.rcvif;
    107 		for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next) {
    108 			if (aa->aa_ifp == ifp &&
    109 			    (aa->aa_flags & AFA_PHASE2) == 0)
    110 				break;
    111 		}
    112 		if (aa == NULL) {	/* ifp not an appletalk interface */
    113 			m_freem(m);
    114 			continue;
    115 		}
    116 		if (m->m_len < SZ_ELAPHDR &&
    117 		    ((m = m_pullup(m, SZ_ELAPHDR)) == 0)) {
    118 			DDP_STATINC(DDP_STAT_TOOSHORT);
    119 			continue;
    120 		}
    121 		elhp = mtod(m, struct elaphdr *);
    122 		m_adj(m, SZ_ELAPHDR);
    123 
    124 		if (elhp->el_type == ELAP_DDPEXTEND) {
    125 			ddp_input(m, ifp, (struct elaphdr *) NULL, 1);
    126 		} else {
    127 			bcopy((void *) elhp, (void *) & elh, SZ_ELAPHDR);
    128 			ddp_input(m, ifp, &elh, 1);
    129 		}
    130 	}
    131 	mutex_exit(softnet_lock);
    132 }
    133 
    134 struct route    forwro;
    135 
    136 void
    137 ddp_input(struct mbuf *m, struct ifnet *ifp, struct elaphdr *elh, int phase)
    138 {
    139 	struct rtentry *rt;
    140 	struct sockaddr_at from, to;
    141 	struct ddpshdr *dsh, ddps;
    142 	struct at_ifaddr *aa;
    143 	struct ddpehdr *deh = NULL, ddpe;
    144 	struct ddpcb   *ddp;
    145 	int             dlen, mlen;
    146 	u_short         cksum = 0;
    147 	union {
    148 		struct sockaddr		dst;
    149 		struct sockaddr_at	dsta;
    150 	} u;
    151 
    152 	bzero((void *) & from, sizeof(struct sockaddr_at));
    153 	if (elh) {
    154 		DDP_STATINC(DDP_STAT_SHORT);
    155 
    156 		if (m->m_len < sizeof(struct ddpshdr) &&
    157 		    ((m = m_pullup(m, sizeof(struct ddpshdr))) == 0)) {
    158 			DDP_STATINC(DDP_STAT_TOOSHORT);
    159 			return;
    160 		}
    161 		dsh = mtod(m, struct ddpshdr *);
    162 		bcopy((void *) dsh, (void *) & ddps, sizeof(struct ddpshdr));
    163 		ddps.dsh_bytes = ntohl(ddps.dsh_bytes);
    164 		dlen = ddps.dsh_len;
    165 
    166 		to.sat_addr.s_net = ATADDR_ANYNET;
    167 		to.sat_addr.s_node = elh->el_dnode;
    168 		to.sat_port = ddps.dsh_dport;
    169 		from.sat_addr.s_net = ATADDR_ANYNET;
    170 		from.sat_addr.s_node = elh->el_snode;
    171 		from.sat_port = ddps.dsh_sport;
    172 
    173 		for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next) {
    174 			if (aa->aa_ifp == ifp &&
    175 			    (aa->aa_flags & AFA_PHASE2) == 0 &&
    176 			    (AA_SAT(aa)->sat_addr.s_node ==
    177 			     to.sat_addr.s_node ||
    178 			     to.sat_addr.s_node == ATADDR_BCAST))
    179 				break;
    180 		}
    181 		if (aa == NULL) {
    182 			m_freem(m);
    183 			return;
    184 		}
    185 	} else {
    186 		DDP_STATINC(DDP_STAT_LONG);
    187 
    188 		if (m->m_len < sizeof(struct ddpehdr) &&
    189 		    ((m = m_pullup(m, sizeof(struct ddpehdr))) == 0)) {
    190 			DDP_STATINC(DDP_STAT_TOOSHORT);
    191 			return;
    192 		}
    193 		deh = mtod(m, struct ddpehdr *);
    194 		bcopy((void *) deh, (void *) & ddpe, sizeof(struct ddpehdr));
    195 		ddpe.deh_bytes = ntohl(ddpe.deh_bytes);
    196 		dlen = ddpe.deh_len;
    197 
    198 		if ((cksum = ddpe.deh_sum) == 0) {
    199 			DDP_STATINC(DDP_STAT_NOSUM);
    200 		}
    201 		from.sat_addr.s_net = ddpe.deh_snet;
    202 		from.sat_addr.s_node = ddpe.deh_snode;
    203 		from.sat_port = ddpe.deh_sport;
    204 		to.sat_addr.s_net = ddpe.deh_dnet;
    205 		to.sat_addr.s_node = ddpe.deh_dnode;
    206 		to.sat_port = ddpe.deh_dport;
    207 
    208 		if (to.sat_addr.s_net == ATADDR_ANYNET) {
    209 			for (aa = at_ifaddr.tqh_first; aa;
    210 			    aa = aa->aa_list.tqe_next) {
    211 				if (phase == 1 && (aa->aa_flags & AFA_PHASE2))
    212 					continue;
    213 
    214 				if (phase == 2 &&
    215 				    (aa->aa_flags & AFA_PHASE2) == 0)
    216 					continue;
    217 
    218 				if (aa->aa_ifp == ifp &&
    219 				    (AA_SAT(aa)->sat_addr.s_node ==
    220 				     to.sat_addr.s_node ||
    221 				     to.sat_addr.s_node == ATADDR_BCAST ||
    222 				     (ifp->if_flags & IFF_LOOPBACK)))
    223 					break;
    224 			}
    225 		} else {
    226 			for (aa = at_ifaddr.tqh_first; aa;
    227 			    aa = aa->aa_list.tqe_next) {
    228 				if (to.sat_addr.s_net == aa->aa_firstnet &&
    229 				    to.sat_addr.s_node == 0)
    230 					break;
    231 
    232 				if ((ntohs(to.sat_addr.s_net) <
    233 				     ntohs(aa->aa_firstnet) ||
    234 				     ntohs(to.sat_addr.s_net) >
    235 				     ntohs(aa->aa_lastnet)) &&
    236 				    (ntohs(to.sat_addr.s_net) < 0xff00 ||
    237 				     ntohs(to.sat_addr.s_net) > 0xfffe))
    238 					continue;
    239 
    240 				if (to.sat_addr.s_node !=
    241 				    AA_SAT(aa)->sat_addr.s_node &&
    242 				    to.sat_addr.s_node != ATADDR_BCAST)
    243 					continue;
    244 
    245 				break;
    246 			}
    247 		}
    248 	}
    249 
    250 	/*
    251          * Adjust the length, removing any padding that may have been added
    252          * at a link layer.  We do this before we attempt to forward a packet,
    253          * possibly on a different media.
    254          */
    255 	mlen = m->m_pkthdr.len;
    256 	if (mlen < dlen) {
    257 		DDP_STATINC(DDP_STAT_TOOSMALL);
    258 		m_freem(m);
    259 		return;
    260 	}
    261 	if (mlen > dlen) {
    262 		m_adj(m, dlen - mlen);
    263 	}
    264 	/*
    265          * XXX Should we deliver broadcasts locally, also, or rely on the
    266          * link layer to give us a copy?  For the moment, the latter.
    267          */
    268 	if (aa == NULL || (to.sat_addr.s_node == ATADDR_BCAST &&
    269 		aa->aa_ifp != ifp && (ifp->if_flags & IFF_LOOPBACK) == 0)) {
    270 		if (ddp_forward == 0) {
    271 			m_freem(m);
    272 			return;
    273 		}
    274 		sockaddr_at_init(&u.dsta, &to.sat_addr, 0);
    275 		rt = rtcache_lookup(&forwro, &u.dst);
    276 #if 0		/* XXX The if-condition is always false.  What was this
    277 		 * actually trying to test?
    278 		 */
    279 		if (to.sat_addr.s_net !=
    280 		    satocsat(rtcache_getdst(&forwro))->sat_addr.s_net &&
    281 		    ddpe.deh_hops == DDP_MAXHOPS) {
    282 			m_freem(m);
    283 			return;
    284 		}
    285 #endif
    286 		if (ddp_firewall && (rt == NULL || rt->rt_ifp != ifp)) {
    287 			m_freem(m);
    288 			return;
    289 		}
    290 		ddpe.deh_hops++;
    291 		ddpe.deh_bytes = htonl(ddpe.deh_bytes);
    292 		bcopy((void *) & ddpe, (void *) deh, sizeof(u_short));/*XXX*/
    293 		if (ddp_route(m, &forwro)) {
    294 			DDP_STATINC(DDP_STAT_CANTFORWARD);
    295 		} else {
    296 			DDP_STATINC(DDP_STAT_FORWARD);
    297 		}
    298 		return;
    299 	}
    300 	from.sat_len = sizeof(struct sockaddr_at);
    301 	from.sat_family = AF_APPLETALK;
    302 
    303 	if (elh) {
    304 		m_adj(m, sizeof(struct ddpshdr));
    305 	} else {
    306 		if (ddp_cksum && cksum && cksum != at_cksum(m, sizeof(int))) {
    307 			DDP_STATINC(DDP_STAT_BADSUM);
    308 			m_freem(m);
    309 			return;
    310 		}
    311 		m_adj(m, sizeof(struct ddpehdr));
    312 	}
    313 
    314 	if ((ddp = ddp_search(&from, &to, aa)) == NULL) {
    315 		m_freem(m);
    316 		return;
    317 	}
    318 	if (sbappendaddr(&ddp->ddp_socket->so_rcv, (struct sockaddr *) & from,
    319 			 m, (struct mbuf *) 0) == 0) {
    320 		DDP_STATINC(DDP_STAT_NOSOCKSPACE);
    321 		m_freem(m);
    322 		return;
    323 	}
    324 #if IFA_STATS
    325 	if (aa)
    326 		aa->aa_ifa.ifa_data.ifad_inbytes += dlen;
    327 #endif
    328 	sorwakeup(ddp->ddp_socket);
    329 }
    330 
    331 #if 0
    332 
    333 #define BPXLEN	48
    334 #define BPALEN	16
    335 #include <ctype.h>
    336 
    337 static void
    338 bprint(char *data, int len)
    339 {
    340 	char            xout[BPXLEN], aout[BPALEN];
    341 	int             i = 0;
    342 
    343 	bzero(xout, BPXLEN);
    344 	bzero(aout, BPALEN);
    345 
    346 	for (;;) {
    347 		if (len < 1) {
    348 			if (i != 0) {
    349 				printf("%s\t%s\n", xout, aout);
    350 			}
    351 			printf("%s\n", "(end)");
    352 			break;
    353 		}
    354 		xout[(i * 3)] = hexdigits[(*data & 0xf0) >> 4];
    355 		xout[(i * 3) + 1] = hexdigits[*data & 0x0f];
    356 
    357 		if ((u_char) * data < 0x7f && (u_char) * data > 0x20) {
    358 			aout[i] = *data;
    359 		} else {
    360 			aout[i] = '.';
    361 		}
    362 
    363 		xout[(i * 3) + 2] = ' ';
    364 
    365 		i++;
    366 		len--;
    367 		data++;
    368 
    369 		if (i > BPALEN - 2) {
    370 			printf("%s\t%s\n", xout, aout);
    371 			bzero(xout, BPXLEN);
    372 			bzero(aout, BPALEN);
    373 			i = 0;
    374 			continue;
    375 		}
    376 	}
    377 }
    378 
    379 static void
    380 m_printm(struct mbuf *m)
    381 {
    382 	for (; m; m = m->m_next)
    383 		bprint(mtod(m, char *), m->m_len);
    384 }
    385 #endif
    386