1 // SPDX-License-Identifier: GPL-2.0-or-later
29  *		Bradford Johnson	:	IP-over-DDP (experimental)
30  *		Jay Schulist		:	Moved IP-over-DDP to its own
59 #include <net/route.h>
97 		if (to->sat_port != at->src_port)  in atalk_search_socket()
100 		if (to->sat_addr.s_net == ATADDR_ANYNET &&  in atalk_search_socket()
101 		    to->sat_addr.s_node == ATADDR_BCAST)  in atalk_search_socket()
104 		if (to->sat_addr.s_net == at->src_net &&  in atalk_search_socket()
105 		    (to->sat_addr.s_node == at->src_node ||  in atalk_search_socket()
106 		     to->sat_addr.s_node == ATADDR_BCAST ||  in atalk_search_socket()
107 		     to->sat_addr.s_node == ATADDR_ANYNODE))  in atalk_search_socket()
110 		/* XXXX.0 -- we got a request for this router. make sure  in atalk_search_socket()
112 		if (to->sat_addr.s_node == ATADDR_ANYNODE &&  in atalk_search_socket()
113 		    to->sat_addr.s_net != ATADDR_ANYNET &&  in atalk_search_socket()
114 		    atif->address.s_node == at->src_node) {  in atalk_search_socket()
115 			to->sat_addr.s_node = atif->address.s_node;  in atalk_search_socket()
126  * atalk_find_or_insert_socket - Try to find a socket matching ADDR
145 		if (at->src_net == sat->sat_addr.s_net &&  in atalk_find_or_insert_socket()
146 		    at->src_node == sat->sat_addr.s_node &&  in atalk_find_or_insert_socket()
147 		    at->src_port == sat->sat_port)  in atalk_find_or_insert_socket()
162 		sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;  in atalk_destroy_timer()
163 		add_timer(&sk->sk_timer);  in atalk_destroy_timer()
171 	skb_queue_purge(&sk->sk_receive_queue);  in atalk_destroy_socket()
174 		timer_setup(&sk->sk_timer, atalk_destroy_timer, 0);  in atalk_destroy_socket()
175 		sk->sk_timer.expires	= jiffies + SOCK_DESTROY_TIME;  in atalk_destroy_socket()
176 		add_timer(&sk->sk_timer);  in atalk_destroy_socket()
187 /* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
199  * Drop a device. Doesn't drop any of its routes - that is the caller's
209 		if (tmp->dev == dev) {  in atif_drop_device()
210 			*iface = tmp->next;  in atif_drop_device()
213 			dev->atalk_ptr = NULL;  in atif_drop_device()
215 			iface = &tmp->next;  in atif_drop_device()
229 	iface->dev = dev;  in atif_add_device()
230 	dev->atalk_ptr = iface;  in atif_add_device()
231 	iface->address = *sa;  in atif_add_device()
232 	iface->status = 0;  in atif_add_device()
235 	iface->next = atalk_interfaces;  in atif_add_device()
245 	int netrange = ntohs(atif->nets.nr_lastnet) -  in atif_probe_device()
246 			ntohs(atif->nets.nr_firstnet) + 1;  in atif_probe_device()
247 	int probe_net = ntohs(atif->address.s_net);  in atif_probe_device()
248 	int probe_node = atif->address.s_node;  in atif_probe_device()
253 		probe_net = ntohs(atif->nets.nr_firstnet);  in atif_probe_device()
261 	atif->status |= ATIF_PROBE;  in atif_probe_device()
264 		atif->address.s_net = htons(probe_net);  in atif_probe_device()
266 			atif->address.s_node = (nodect + probe_node) & 0xFF;  in atif_probe_device()
267 			if (atif->address.s_node > 0 &&  in atif_probe_device()
268 			    atif->address.s_node < 254) {  in atif_probe_device()
272 				if (!(atif->status & ATIF_PROBE_FAIL)) {  in atif_probe_device()
273 					atif->status &= ~ATIF_PROBE;  in atif_probe_device()
277 			atif->status &= ~ATIF_PROBE_FAIL;  in atif_probe_device()
280 		if (probe_net > ntohs(atif->nets.nr_lastnet))  in atif_probe_device()
281 			probe_net = ntohs(atif->nets.nr_firstnet);  in atif_probe_device()
283 	atif->status &= ~ATIF_PROBE;  in atif_probe_device()
285 	return -EADDRINUSE;	/* Network is full... */  in atif_probe_device()
293 	int netrange = ntohs(atif->nets.nr_lastnet) -  in atif_proxy_probe_device()
294 			ntohs(atif->nets.nr_firstnet) + 1;  in atif_proxy_probe_device()
296 	int probe_net = ntohs(atif->address.s_net);  in atif_proxy_probe_device()
302 		probe_net = ntohs(atif->nets.nr_firstnet);  in atif_proxy_probe_device()
313 		proxy_addr->s_net = htons(probe_net);  in atif_proxy_probe_device()
315 			proxy_addr->s_node = (nodect + probe_node) & 0xFF;  in atif_proxy_probe_device()
316 			if (proxy_addr->s_node > 0 &&  in atif_proxy_probe_device()
317 			    proxy_addr->s_node < 254) {  in atif_proxy_probe_device()
322 				if (ret != -EADDRINUSE)  in atif_proxy_probe_device()
327 		if (probe_net > ntohs(atif->nets.nr_lastnet))  in atif_proxy_probe_device()
328 			probe_net = ntohs(atif->nets.nr_firstnet);  in atif_proxy_probe_device()
331 	return -EADDRINUSE;	/* Network is full... */  in atif_proxy_probe_device()
337 	struct atalk_iface *iface = dev->atalk_ptr;  in atalk_find_dev_addr()
338 	return iface ? &iface->address : NULL;  in atalk_find_dev_addr()
348 	 * Return a point-to-point interface only if  in atalk_find_primary()
349 	 * there is no non-ptp interface available.  in atalk_find_primary()
352 	for (iface = atalk_interfaces; iface; iface = iface->next) {  in atalk_find_primary()
353 		if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))  in atalk_find_primary()
355 		if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {  in atalk_find_primary()
356 			retval = &iface->address;  in atalk_find_primary()
362 		retval = &fiface->address;  in atalk_find_primary()
364 		retval = &atalk_interfaces->address;  in atalk_find_primary()
373  * Find a match for 'any network' - ie any of our interfaces with that
378 	struct atalk_iface *iface = dev->atalk_ptr;  in atalk_find_anynet()
380 	if (!iface || iface->status & ATIF_PROBE)  in atalk_find_anynet()
384 	    iface->address.s_node != node &&  in atalk_find_anynet()
400 	for (iface = atalk_interfaces; iface; iface = iface->next) {  in atalk_find_interface()
403 		     iface->address.s_node == node) &&  in atalk_find_interface()
404 		    iface->address.s_net == net &&  in atalk_find_interface()
405 		    !(iface->status & ATIF_PROBE))  in atalk_find_interface()
408 		/* XXXX.0 -- net.0 returns the iface associated with net */  in atalk_find_interface()
410 		    ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&  in atalk_find_interface()
411 		    ntohs(net) <= ntohs(iface->nets.nr_lastnet))  in atalk_find_interface()
420  * Find a route for an AppleTalk packet. This ought to get cached in
422  * that a route must be direct to broadcast.
428 	 * host route, because some host routes might overlap  in atrtr_find()
435 	for (r = atalk_routes; r; r = r->next) {  in atrtr_find()
436 		if (!(r->flags & RTF_UP))  in atrtr_find()
439 		if (r->target.s_net == target->s_net) {  in atrtr_find()
440 			if (r->flags & RTF_HOST) {  in atrtr_find()
442 				 * if this host route is for the target,  in atrtr_find()
445 				if (r->target.s_node == target->s_node)  in atrtr_find()
449 				 * this route will work if there isn't a  in atrtr_find()
450 				 * direct host route, so cache it  in atrtr_find()
457 	 * if we found a network route but not a direct host  in atrtr_find()
458 	 * route, then return it  in atrtr_find()
464 	else /* No route can be found */  in atrtr_find()
479 	return atr ? atr->dev : NULL;  in atrtr_get_dev()
498 	struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;  in atrtr_create()
499 	struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;  in atrtr_create()
502 	int retval = -EINVAL;  in atrtr_create()
510 	if (ta->sat_family != AF_APPLETALK ||  in atrtr_create()
511 	    (!devhint && ga->sat_family != AF_APPLETALK))  in atrtr_create()
516 	for (rt = atalk_routes; rt; rt = rt->next) {  in atrtr_create()
517 		if (r->rt_flags != rt->flags)  in atrtr_create()
520 		if (ta->sat_addr.s_net == rt->target.s_net) {  in atrtr_create()
521 			if (!(rt->flags & RTF_HOST))  in atrtr_create()
523 			if (ta->sat_addr.s_node == rt->target.s_node)  in atrtr_create()
532 		for (iface = atalk_interfaces; iface; iface = iface->next) {  in atrtr_create()
534 			    ntohs(ga->sat_addr.s_net) >=  in atrtr_create()
535 					ntohs(iface->nets.nr_firstnet) &&  in atrtr_create()
536 			    ntohs(ga->sat_addr.s_net) <=  in atrtr_create()
537 					ntohs(iface->nets.nr_lastnet))  in atrtr_create()
540 			if (ga->sat_addr.s_net == iface->address.s_net &&  in atrtr_create()
541 			    ga->sat_addr.s_node == iface->address.s_node)  in atrtr_create()
546 		retval = -ENETUNREACH;  in atrtr_create()
550 		devhint = riface->dev;  in atrtr_create()
556 		retval = -ENOBUFS;  in atrtr_create()
560 		rt->next = atalk_routes;  in atrtr_create()
565 	rt->target  = ta->sat_addr;  in atrtr_create()
567 	rt->dev     = devhint;  in atrtr_create()
568 	rt->flags   = r->rt_flags;  in atrtr_create()
569 	rt->gateway = ga->sat_addr;  in atrtr_create()
578 /* Delete a route. Find it and discard it */
587 		if (tmp->target.s_net == addr->s_net &&  in atrtr_delete()
588 		    (!(tmp->flags&RTF_GATEWAY) ||  in atrtr_delete()
589 		     tmp->target.s_node == addr->s_node)) {  in atrtr_delete()
590 			*r = tmp->next;  in atrtr_delete()
591 			dev_put(tmp->dev);  in atrtr_delete()
595 		r = &tmp->next;  in atrtr_delete()
597 	retval = -ENOENT;  in atrtr_delete()
614 		if (tmp->dev == dev) {  in atrtr_device_down()
615 			*r = tmp->next;  in atrtr_device_down()
619 			r = &tmp->next;  in atrtr_device_down()
637  * delete our use of them (iface and route).
670 		return -EFAULT;  in atif_ioctl()
674 		return -ENODEV;  in atif_ioctl()
682 			return -EPERM;  in atif_ioctl()
683 		if (sa->sat_family != AF_APPLETALK)  in atif_ioctl()
684 			return -EINVAL;  in atif_ioctl()
685 		if (dev->type != ARPHRD_ETHER &&  in atif_ioctl()
686 		    dev->type != ARPHRD_LOOPBACK &&  in atif_ioctl()
687 		    dev->type != ARPHRD_LOCALTLK &&  in atif_ioctl()
688 		    dev->type != ARPHRD_PPP)  in atif_ioctl()
689 			return -EPROTONOSUPPORT;  in atif_ioctl()
691 		nr = (struct atalk_netrange *)&sa->sat_zero[0];  in atif_ioctl()
695 		 * if this is a point-to-point iface, and we already  in atif_ioctl()
697 		 * should not add a route  in atif_ioctl()
699 		if ((dev->flags & IFF_POINTOPOINT) &&  in atif_ioctl()
700 		    atalk_find_interface(sa->sat_addr.s_net,  in atif_ioctl()
701 					 sa->sat_addr.s_node)) {  in atif_ioctl()
702 			printk(KERN_DEBUG "AppleTalk: point-to-point "  in atif_ioctl()
712 		if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)  in atif_ioctl()
713 			return -EPROTONOSUPPORT;  in atif_ioctl()
714 		if (sa->sat_addr.s_node == ATADDR_BCAST ||  in atif_ioctl()
715 		    sa->sat_addr.s_node == 254)  in atif_ioctl()
716 			return -EINVAL;  in atif_ioctl()
719 			if (atif->status & ATIF_PROBE)  in atif_ioctl()
720 				return -EBUSY;  in atif_ioctl()
722 			atif->address.s_net  = sa->sat_addr.s_net;  in atif_ioctl()
723 			atif->address.s_node = sa->sat_addr.s_node;  in atif_ioctl()
726 			atif = atif_add_device(dev, &sa->sat_addr);  in atif_ioctl()
728 				return -ENOMEM;  in atif_ioctl()
730 		atif->nets = *nr;  in atif_ioctl()
737 		if (!(dev->flags & IFF_LOOPBACK) &&  in atif_ioctl()
738 		    !(dev->flags & IFF_POINTOPOINT) &&  in atif_ioctl()
741 			return -EADDRINUSE;  in atif_ioctl()
744 		/* Hey it worked - add the direct routes */  in atif_ioctl()
746 		sa->sat_family = AF_APPLETALK;  in atif_ioctl()
747 		sa->sat_addr.s_net  = atif->address.s_net;  in atif_ioctl()
748 		sa->sat_addr.s_node = atif->address.s_node;  in atif_ioctl()
751 		sa->sat_family = AF_APPLETALK;  in atif_ioctl()
752 		sa->sat_addr.s_node = ATADDR_ANYNODE;  in atif_ioctl()
753 		if (dev->flags & IFF_LOOPBACK ||  in atif_ioctl()
754 		    dev->flags & IFF_POINTOPOINT)  in atif_ioctl()
758 		if (nr->nr_firstnet == htons(0) &&  in atif_ioctl()
759 		    nr->nr_lastnet == htons(0xFFFE)) {  in atif_ioctl()
760 			sa->sat_addr.s_net = atif->address.s_net;  in atif_ioctl()
764 			limit = ntohs(nr->nr_lastnet);  in atif_ioctl()
765 			if (limit - ntohs(nr->nr_firstnet) > 4096) {  in atif_ioctl()
768 				return -EINVAL;  in atif_ioctl()
771 				for (ct = ntohs(nr->nr_firstnet);  in atif_ioctl()
773 					sa->sat_addr.s_net = htons(ct);  in atif_ioctl()
782 			return -EADDRNOTAVAIL;  in atif_ioctl()
784 		sa->sat_family = AF_APPLETALK;  in atif_ioctl()
785 		sa->sat_addr = atif->address;  in atif_ioctl()
790 			return -EADDRNOTAVAIL;  in atif_ioctl()
792 		sa->sat_family = AF_APPLETALK;  in atif_ioctl()
793 		sa->sat_addr.s_net = atif->address.s_net;  in atif_ioctl()
794 		sa->sat_addr.s_node = ATADDR_BCAST;  in atif_ioctl()
800 			return -EPERM;  in atif_ioctl()
801 		if (sa->sat_family != AF_APPLETALK)  in atif_ioctl()
802 			return -EINVAL;  in atif_ioctl()
808 			return -EPERM;  in atif_ioctl()
809 		if (sa->sat_family != AF_APPLETALK)  in atif_ioctl()
810 			return -EINVAL;  in atif_ioctl()
815 		if (dev->type != ARPHRD_ETHER)  in atif_ioctl()
816 			return -EPROTONOSUPPORT;  in atif_ioctl()
826 			return -EADDRNOTAVAIL;  in atif_ioctl()
828 		nr = (struct atalk_netrange *)&(atif->nets);  in atif_ioctl()
833 		if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)  in atif_ioctl()
834 			return -EPROTONOSUPPORT;  in atif_ioctl()
836 		if (sa->sat_addr.s_node == ATADDR_BCAST ||  in atif_ioctl()
837 		    sa->sat_addr.s_node == 254)  in atif_ioctl()
838 			return -EINVAL;  in atif_ioctl()
844 		if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)  in atif_ioctl()
845 			return -EADDRINUSE;  in atif_ioctl()
857 			return -EPERM;  in atif_ioctl()
858 		if (sa->sat_family != AF_APPLETALK)  in atif_ioctl()
859 			return -EINVAL;  in atif_ioctl()
861 			return -EADDRNOTAVAIL;  in atif_ioctl()
864 		aarp_proxy_remove(atif->dev, &(sa->sat_addr));  in atif_ioctl()
868 	return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;  in atif_ioctl()
875 	if (rt->rt_dev) {  in atrtr_ioctl_addrt()
878 		if (copy_from_user(name, rt->rt_dev, IFNAMSIZ-1))  in atrtr_ioctl_addrt()
879 			return -EFAULT;  in atrtr_ioctl_addrt()
880 		name[IFNAMSIZ-1] = '\0';  in atrtr_ioctl_addrt()
884 			return -ENODEV;  in atrtr_ioctl_addrt()
895 		return -EFAULT;  in atrtr_ioctl()
900 			return -EINVAL;  in atrtr_ioctl()
902 				      &rt.rt_dst)->sat_addr);  in atrtr_ioctl()
907 	return -EINVAL;  in atrtr_ioctl()
925 	while (len--) {  in atalk_sum_partial()
932 /*  Checksum skb data --  similar to skb_checksum  */
941 	if ((copy = start - offset) > 0) {  in atalk_sum_skb()
944 		sum = atalk_sum_partial(skb->data + offset, copy, sum);  in atalk_sum_skb()
945 		if ((len -= copy) == 0)  in atalk_sum_skb()
952 	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {  in atalk_sum_skb()
954 		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];  in atalk_sum_skb()
958 		if ((copy = end - offset) > 0) {  in atalk_sum_skb()
965 						offset - start, copy, sum);  in atalk_sum_skb()
968 			if (!(len -= copy))  in atalk_sum_skb()
980 		end = start + frag_iter->len;  in atalk_sum_skb()
981 		if ((copy = end - offset) > 0) {  in atalk_sum_skb()
984 			sum = atalk_sum_skb(frag_iter, offset - start,  in atalk_sum_skb()
986 			if ((len -= copy) == 0)  in atalk_sum_skb()
1003 	sum = atalk_sum_skb(skb, 4, len-4, 0);  in atalk_checksum()
1023 	int rc = -ESOCKTNOSUPPORT;  in atalk_create()
1026 		return -EAFNOSUPPORT;  in atalk_create()
1032 	if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)  in atalk_create()
1035 	rc = -EPERM;  in atalk_create()
1036 	if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))  in atalk_create()
1039 	rc = -ENOMEM;  in atalk_create()
1044 	sock->ops = &atalk_dgram_ops;  in atalk_create()
1056 	struct sock *sk = sock->sk;  in atalk_release()
1063 		sock->sk = NULL;  in atalk_release()
1073  * atalk_pick_and_bind_port - Pick a source port when one is not given
1088 	for (sat->sat_port = ATPORT_RESERVED;  in atalk_pick_and_bind_port()
1089 	     sat->sat_port < ATPORT_LAST;  in atalk_pick_and_bind_port()
1090 	     sat->sat_port++) {  in atalk_pick_and_bind_port()
1096 			if (at->src_net == sat->sat_addr.s_net &&  in atalk_pick_and_bind_port()
1097 			    at->src_node == sat->sat_addr.s_node &&  in atalk_pick_and_bind_port()
1098 			    at->src_port == sat->sat_port)  in atalk_pick_and_bind_port()
1104 		at_sk(sk)->src_port = sat->sat_port;  in atalk_pick_and_bind_port()
1111 	retval = -EBUSY;  in atalk_pick_and_bind_port()
1122 	int n = -EADDRNOTAVAIL;  in atalk_autobind()
1124 	if (!ap || ap->s_net == htons(ATADDR_ANYNET))  in atalk_autobind()
1127 	at->src_net  = sat.sat_addr.s_net  = ap->s_net;  in atalk_autobind()
1128 	at->src_node = sat.sat_addr.s_node = ap->s_node;  in atalk_autobind()
1141 	struct sock *sk = sock->sk;  in atalk_bind()
1147 		return -EINVAL;  in atalk_bind()
1149 	if (addr->sat_family != AF_APPLETALK)  in atalk_bind()
1150 		return -EAFNOSUPPORT;  in atalk_bind()
1153 	if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {  in atalk_bind()
1156 		err = -EADDRNOTAVAIL;  in atalk_bind()
1160 		at->src_net  = addr->sat_addr.s_net = ap->s_net;  in atalk_bind()
1161 		at->src_node = addr->sat_addr.s_node = ap->s_node;  in atalk_bind()
1163 		err = -EADDRNOTAVAIL;  in atalk_bind()
1164 		if (!atalk_find_interface(addr->sat_addr.s_net,  in atalk_bind()
1165 					  addr->sat_addr.s_node))  in atalk_bind()
1168 		at->src_net  = addr->sat_addr.s_net;  in atalk_bind()
1169 		at->src_node = addr->sat_addr.s_node;  in atalk_bind()
1172 	if (addr->sat_port == ATADDR_ANYPORT) {  in atalk_bind()
1178 		at->src_port = addr->sat_port;  in atalk_bind()
1180 		err = -EADDRINUSE;  in atalk_bind()
1196 	struct sock *sk = sock->sk;  in atalk_connect()
1201 	sk->sk_state   = TCP_CLOSE;  in atalk_connect()
1202 	sock->state = SS_UNCONNECTED;  in atalk_connect()
1205 		return -EINVAL;  in atalk_connect()
1209 	if (addr->sat_family != AF_APPLETALK)  in atalk_connect()
1210 		return -EAFNOSUPPORT;  in atalk_connect()
1212 	if (addr->sat_addr.s_node == ATADDR_BCAST &&  in atalk_connect()
1216 			current->comm);  in atalk_connect()
1218 		return -EACCES;  in atalk_connect()
1223 	err = -EBUSY;  in atalk_connect()
1228 	err = -ENETUNREACH;  in atalk_connect()
1229 	if (!atrtr_get_dev(&addr->sat_addr))  in atalk_connect()
1232 	at->dest_port = addr->sat_port;  in atalk_connect()
1233 	at->dest_net  = addr->sat_addr.s_net;  in atalk_connect()
1234 	at->dest_node = addr->sat_addr.s_node;  in atalk_connect()
1236 	sock->state  = SS_CONNECTED;  in atalk_connect()
1237 	sk->sk_state = TCP_ESTABLISHED;  in atalk_connect()
1252 	struct sock *sk = sock->sk;  in atalk_getname()
1257 	err = -ENOBUFS;  in atalk_getname()
1265 		err = -ENOTCONN;  in atalk_getname()
1266 		if (sk->sk_state != TCP_ESTABLISHED)  in atalk_getname()
1269 		sat.sat_addr.s_net  = at->dest_net;  in atalk_getname()
1270 		sat.sat_addr.s_node = at->dest_node;  in atalk_getname()
1271 		sat.sat_port	    = at->dest_port;  in atalk_getname()
1273 		sat.sat_addr.s_net  = at->src_net;  in atalk_getname()
1274 		sat.sat_addr.s_node = at->src_node;  in atalk_getname()
1275 		sat.sat_port	    = at->src_port;  in atalk_getname()
1290 	return skb->data[12] == 22;  in is_ip_over_ddp()
1304 	skb->protocol = htons(ETH_P_IP);  in handle_ip_over_ddp()
1306 	skb->dev   = dev;  in handle_ip_over_ddp()
1310 	stats->rx_packets++;  in handle_ip_over_ddp()
1311 	stats->rx_bytes += skb->len + 13;  in handle_ip_over_ddp()
1327 	 * Don't route multicast, etc., packets, or packets sent to "this  in atalk_route_packet()
1330 	if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {  in atalk_route_packet()
1337 		if (dev->type == ARPHRD_PPP)  in atalk_route_packet()
1343 	ta.s_net  = ddp->deh_dnet;  in atalk_route_packet()
1344 	ta.s_node = ddp->deh_dnode;  in atalk_route_packet()
1346 	/* Route the packet */  in atalk_route_packet()
1353 	/* FIXME: use skb->cb to be able to use shared skbs */  in atalk_route_packet()
1356 	 * Route goes through another gateway, so set the target to the  in atalk_route_packet()
1360 	if (rt->flags & RTF_GATEWAY) {  in atalk_route_packet()
1361 		ta.s_net  = rt->gateway.s_net;  in atalk_route_packet()
1362 		ta.s_node = rt->gateway.s_node;  in atalk_route_packet()
1365 	/* Fix up skb->len field */  in atalk_route_packet()
1367 			    (rt->dev->hard_header_len +  in atalk_route_packet()
1368 			     ddp_dl->header_length + (len_hops & 1023))));  in atalk_route_packet()
1370 	/* FIXME: use skb->cb to be able to use shared skbs */  in atalk_route_packet()
1371 	ddp->deh_len_hops = htons(len_hops);  in atalk_route_packet()
1382 	 * Note. ddp-> becomes invalid at the realloc.  in atalk_route_packet()
1385 		/* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */  in atalk_route_packet()
1399 	if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP)  in atalk_route_packet()
1409  *	atalk_rcv - Receive a packet (in skb) from device dev
1410  *	@skb - packet received
1411  *	@dev - network device where the packet comes from
1412  *	@pt - packet type
1415  *	decoder, and on entry skb->transport_header is the DDP header, skb->len
1416  *	is the DDP header, skb->len is the DDP length. The physical headers
1443 	len_hops = ntohs(ddp->deh_len_hops);  in atalk_rcv()
1446 	origlen = skb->len;  in atalk_rcv()
1447 	skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));  in atalk_rcv()
1450 	 * Size check to see if ddp->deh_len was crap  in atalk_rcv()
1454 	if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {  in atalk_rcv()
1456 			 "skb->len=%u)\n", len_hops & 1023, skb->len);  in atalk_rcv()
1464 	if (ddp->deh_sum &&  in atalk_rcv()
1465 	    atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)  in atalk_rcv()
1466 		/* Not a valid AppleTalk frame - dustbin time */  in atalk_rcv()
1470 	if (!ddp->deh_dnet)	/* Net 0 is 'this network' */  in atalk_rcv()
1471 		atif = atalk_find_anynet(ddp->deh_dnode, dev);  in atalk_rcv()
1473 		atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);  in atalk_rcv()
1476 		/* Not ours, so we route the packet via the correct  in atalk_rcv()
1486 	 * Which socket - atalk_search_socket() looks for a *full match*  in atalk_rcv()
1489 	tosat.sat_addr.s_net  = ddp->deh_dnet;  in atalk_rcv()
1490 	tosat.sat_addr.s_node = ddp->deh_dnode;  in atalk_rcv()
1491 	tosat.sat_port	      = ddp->deh_dport;  in atalk_rcv()
1527 		if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)  in ltalk_rcv()
1538 		ddp = skb_push(skb, sizeof(*ddp) - 4);  in ltalk_rcv()
1548 		ddp->deh_dnode = skb_mac_header(skb)[0];     /* From physical header */  in ltalk_rcv()
1549 		ddp->deh_snode = skb_mac_header(skb)[1];     /* From physical header */  in ltalk_rcv()
1551 		ddp->deh_dnet  = ap->s_net;	/* Network number */  in ltalk_rcv()
1552 		ddp->deh_snet  = ap->s_net;  in ltalk_rcv()
1553 		ddp->deh_sum   = 0;		/* No checksum */  in ltalk_rcv()
1558 		ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));  in ltalk_rcv()
1570 	struct sock *sk = sock->sk;  in atalk_sendmsg()
1572 	DECLARE_SOCKADDR(struct sockaddr_at *, usat, msg->msg_name);  in atalk_sendmsg()
1573 	int flags = msg->msg_flags;  in atalk_sendmsg()
1584 		return -EINVAL;  in atalk_sendmsg()
1587 		return -EMSGSIZE;  in atalk_sendmsg()
1591 		err = -EBUSY;  in atalk_sendmsg()
1596 		err = -EINVAL;  in atalk_sendmsg()
1597 		if (msg->msg_namelen < sizeof(*usat) ||  in atalk_sendmsg()
1598 		    usat->sat_family != AF_APPLETALK)  in atalk_sendmsg()
1601 		err = -EPERM;  in atalk_sendmsg()
1603 		if (usat->sat_addr.s_node == ATADDR_BCAST &&  in atalk_sendmsg()
1608 		err = -ENOTCONN;  in atalk_sendmsg()
1609 		if (sk->sk_state != TCP_ESTABLISHED)  in atalk_sendmsg()
1612 		usat->sat_family      = AF_APPLETALK;  in atalk_sendmsg()
1613 		usat->sat_port	      = at->dest_port;  in atalk_sendmsg()
1614 		usat->sat_addr.s_node = at->dest_node;  in atalk_sendmsg()
1615 		usat->sat_addr.s_net  = at->dest_net;  in atalk_sendmsg()
1622 	size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;  in atalk_sendmsg()
1624 	if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {  in atalk_sendmsg()
1625 		rt = atrtr_find(&usat->sat_addr);  in atalk_sendmsg()
1630 		at_hint.s_net  = at->src_net;  in atalk_sendmsg()
1634 	err = -ENETUNREACH;  in atalk_sendmsg()
1638 	dev = rt->dev;  in atalk_sendmsg()
1641 			sk, size, dev->name);  in atalk_sendmsg()
1643 	size += dev->hard_header_len;  in atalk_sendmsg()
1650 	skb_reserve(skb, ddp_dl->header_length);  in atalk_sendmsg()
1651 	skb_reserve(skb, dev->hard_header_len);  in atalk_sendmsg()
1652 	skb->dev = dev;  in atalk_sendmsg()
1657 	ddp->deh_len_hops  = htons(len + sizeof(*ddp));  in atalk_sendmsg()
1658 	ddp->deh_dnet  = usat->sat_addr.s_net;  in atalk_sendmsg()
1659 	ddp->deh_snet  = at->src_net;  in atalk_sendmsg()
1660 	ddp->deh_dnode = usat->sat_addr.s_node;  in atalk_sendmsg()
1661 	ddp->deh_snode = at->src_node;  in atalk_sendmsg()
1662 	ddp->deh_dport = usat->sat_port;  in atalk_sendmsg()
1663 	ddp->deh_sport = at->src_port;  in atalk_sendmsg()
1670 		err = -EFAULT;  in atalk_sendmsg()
1674 	if (sk->sk_no_check_tx)  in atalk_sendmsg()
1675 		ddp->deh_sum = 0;  in atalk_sendmsg()
1677 		ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));  in atalk_sendmsg()
1683 	if (ddp->deh_dnode == ATADDR_BCAST &&  in atalk_sendmsg()
1684 	    !(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {  in atalk_sendmsg()
1693 			aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL);  in atalk_sendmsg()
1697 	if (dev->flags & IFF_LOOPBACK || loopback) {  in atalk_sendmsg()
1701 		if (ddp->deh_dnode == ATADDR_BCAST) {  in atalk_sendmsg()
1710 				err = -ENETUNREACH;  in atalk_sendmsg()
1713 			dev = rt->dev;  in atalk_sendmsg()
1714 			skb->dev = dev;  in atalk_sendmsg()
1716 		ddp_dl->request(ddp_dl, skb, dev->dev_addr);  in atalk_sendmsg()
1719 		if (rt->flags & RTF_GATEWAY) {  in atalk_sendmsg()
1720 		    gsat.sat_addr = rt->gateway;  in atalk_sendmsg()
1727 		aarp_send_ddp(dev, skb, &usat->sat_addr, NULL);  in atalk_sendmsg()
1739 	struct sock *sk = sock->sk;  in atalk_recvmsg()
1753 	/* FIXME: use skb->cb to be able to use shared skbs */  in atalk_recvmsg()
1755 	copied = ntohs(ddp->deh_len_hops) & 1023;  in atalk_recvmsg()
1757 	if (sk->sk_type != SOCK_RAW) {  in atalk_recvmsg()
1759 		copied -= offset;  in atalk_recvmsg()
1764 		msg->msg_flags |= MSG_TRUNC;  in atalk_recvmsg()
1768 	if (!err && msg->msg_name) {  in atalk_recvmsg()
1769 		DECLARE_SOCKADDR(struct sockaddr_at *, sat, msg->msg_name);  in atalk_recvmsg()
1770 		sat->sat_family      = AF_APPLETALK;  in atalk_recvmsg()
1771 		sat->sat_port        = ddp->deh_sport;  in atalk_recvmsg()
1772 		sat->sat_addr.s_node = ddp->deh_snode;  in atalk_recvmsg()
1773 		sat->sat_addr.s_net  = ddp->deh_snet;  in atalk_recvmsg()
1774 		msg->msg_namelen     = sizeof(*sat);  in atalk_recvmsg()
1790 	int rc = -ENOIOCTLCMD;  in atalk_ioctl()
1791 	struct sock *sk = sock->sk;  in atalk_ioctl()
1797 		long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);  in atalk_ioctl()
1809 		struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);  in atalk_ioctl()
1813 			amount = skb->len - sizeof(struct ddpehdr);  in atalk_ioctl()
1820 		rc = -EPERM;  in atalk_ioctl()
1849 	if (copy_from_user(&rt.rt_dst, &ur->rt_dst,  in atalk_compat_routing_ioctl()
1851 	    get_user(rt.rt_flags, &ur->rt_flags) ||  in atalk_compat_routing_ioctl()
1852 	    get_user(rt.rt_metric, &ur->rt_metric) ||  in atalk_compat_routing_ioctl()
1853 	    get_user(rt.rt_mtu, &ur->rt_mtu) ||  in atalk_compat_routing_ioctl()
1854 	    get_user(rt.rt_window, &ur->rt_window) ||  in atalk_compat_routing_ioctl()
1855 	    get_user(rt.rt_irtt, &ur->rt_irtt) ||  in atalk_compat_routing_ioctl()
1856 	    get_user(rtdev, &ur->rt_dev))  in atalk_compat_routing_ioctl()
1857 		return -EFAULT;  in atalk_compat_routing_ioctl()
1862 			return -EINVAL;  in atalk_compat_routing_ioctl()
1864 				      &rt.rt_dst)->sat_addr);  in atalk_compat_routing_ioctl()
1870 		return -EINVAL;  in atalk_compat_routing_ioctl()
1876 	struct sock *sk = sock->sk;  in atalk_compat_ioctl()
1891 		return -ENOIOCTLCMD;  in atalk_compat_ioctl()
1962 		rc = -ENOMEM;  in atalk_init()
2019 	aarp_cleanup_module();	/* General aarp clean-up. */  in atalk_exit()