Use the correct cast, ns_ifra_addr -> ns_ifaddr.
[dragonfly.git] / sys / netproto / ns / ns.c
1 /*
2  * Copyright (c) 1984, 1985, 1986, 1987, 1993
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *      This product includes software developed by the University of
16  *      California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  *      @(#)ns.c        8.2 (Berkeley) 11/15/93
34  * $FreeBSD: src/sys/netns/ns.c,v 1.9 1999/08/28 00:49:47 peter Exp $
35  * $DragonFly: src/sys/netproto/ns/ns.c,v 1.8 2004/05/04 11:54:40 hmp Exp $
36  */
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/malloc.h>
41 #include <sys/mbuf.h>
42 #include <sys/sockio.h>
43 #include <sys/protosw.h>
44 #include <sys/errno.h>
45 #include <sys/socket.h>
46 #include <sys/socketvar.h>
47
48 #include <net/if.h>
49 #include <net/route.h>
50
51 #include "ns.h"
52 #include "ns_if.h"
53
54 #include "opt_ns.h"
55
56 #ifdef NS
57
58 struct ns_ifaddr *ns_ifaddr;
59 int ns_interfaces;
60
61 extern struct sockaddr_ns ns_netmask, ns_hostmask;
62
63 /*
64  * Generic internet control operations (ioctl's).
65  */
66 /* ARGSUSED */
67 int
68 ns_control(so, cmd, data, ifp)
69         struct socket *so;
70         int cmd;
71         caddr_t data;
72         struct ifnet *ifp;
73 {
74         struct ifreq *ifr = (struct ifreq *)data;
75         struct ns_aliasreq *ifra = (struct ns_aliasreq *)data;
76         struct ns_ifaddr *ia;
77         struct ifaddr *ifa = NULL; /* XXX used ininitialized ?*/
78         struct ns_ifaddr *oia;
79         int dstIsNew, hostIsNew;
80         int error = 0; /* initalize because of scoping */
81
82         /*
83          * Find address for this interface, if it exists.
84          */
85         if (ifp == 0)
86                 return (EADDRNOTAVAIL);
87         for (ia = ns_ifaddr; ia; ia = ia->ia_next)
88                 if (ia->ia_ifp == ifp)
89                         break;
90
91         switch (cmd) {
92
93         case SIOCGIFADDR:
94                 if (ia == (struct ns_ifaddr *)0)
95                         return (EADDRNOTAVAIL);
96                 *(struct sockaddr_ns *)&ifr->ifr_addr = ia->ia_addr;
97                 return (0);
98
99
100         case SIOCGIFBRDADDR:
101                 if (ia == (struct ns_ifaddr *)0)
102                         return (EADDRNOTAVAIL);
103                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
104                         return (EINVAL);
105                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_broadaddr;
106                 return (0);
107
108         case SIOCGIFDSTADDR:
109                 if (ia == (struct ns_ifaddr *)0)
110                         return (EADDRNOTAVAIL);
111                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
112                         return (EINVAL);
113                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_dstaddr;
114                 return (0);
115         }
116
117 #ifdef NS_PRIV_SOCKETS
118         if ((so->so_state & SS_PRIV) == 0)
119                 return (EPERM);
120 #endif
121
122         switch (cmd) {
123         case SIOCAIFADDR:
124         case SIOCDIFADDR:
125                 if (ifra->ifra_addr.sns_family == AF_NS)
126                     for (oia = ia; ia; ia = ia->ia_next) {
127                         if (ia->ia_ifp == ifp  &&
128                             ns_neteq(ia->ia_addr.sns_addr,
129                                   ifra->ifra_addr.sns_addr))
130                             break;
131                     }
132                 if (cmd == SIOCDIFADDR && ia == 0)
133                         return (EADDRNOTAVAIL);
134                 /* FALLTHROUGH */
135
136         case SIOCSIFADDR:
137         case SIOCSIFDSTADDR:
138                 if (ia == (struct ns_ifaddr *)0) {
139                         oia = (struct ns_ifaddr *)
140                                 malloc(sizeof *ia, M_IFADDR, M_WAITOK);
141                         if (oia == (struct ns_ifaddr *)NULL)
142                                 return (ENOBUFS);
143                         bzero((caddr_t)oia, sizeof(*oia));
144                         if ((ia = ns_ifaddr) != NULL) {
145                                 for ( ; ia->ia_next; ia = ia->ia_next)
146                                         ;
147                                 ia->ia_next = oia;
148                         } else
149                                 ns_ifaddr = oia;
150                         ia = oia;
151
152                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
153                         ia->ia_ifp = ifp;
154                         ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
155
156                         ia->ia_ifa.ifa_netmask =
157                                 (struct sockaddr *)&ns_netmask;
158
159                         ia->ia_ifa.ifa_dstaddr =
160                                 (struct sockaddr *)&ia->ia_dstaddr;
161                         if (ifp->if_flags & IFF_BROADCAST) {
162                                 ia->ia_broadaddr.sns_family = AF_NS;
163                                 ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
164                                 ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
165                         }
166                         ns_interfaces++;
167                 }
168         }
169
170         switch (cmd) {
171         case SIOCSIFDSTADDR:
172                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
173                         return (EINVAL);
174                 if (ia->ia_flags & IFA_ROUTE) {
175                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
176                         ia->ia_flags &= ~IFA_ROUTE;
177                 }
178                 if (ifp->if_ioctl) {
179                         error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, 
180                                                         (caddr_t)ia,
181                                                         (struct ucred *)NULL);
182                         if (error)
183                                 return (error);
184                 }
185                 *(struct sockaddr *)&ia->ia_dstaddr = ifr->ifr_dstaddr;
186                 return (0);
187
188         case SIOCSIFADDR:
189                 return (ns_ifinit(ifp, (struct ns_ifaddr *)ia,
190                                 (struct sockaddr_ns *)&ifr->ifr_addr, 1));
191
192         case SIOCDIFADDR:
193                 ns_ifscrub(ifp, (struct ns_ifaddr *)ia);
194                 /* XXX not on list */
195                 oia = ia;
196                 TAILQ_REMOVE(&ifp->if_addrhead, (struct ifaddr *)ia, ifa_link);
197                 if (oia == (ia = ns_ifaddr)) {
198                         ns_ifaddr = ia->ia_next;
199                 } else {
200                         while (ia->ia_next && (ia->ia_next != oia)) {
201                                 ia = ia->ia_next;
202                         }
203                         if (ia->ia_next)
204                             ia->ia_next = oia->ia_next;
205                         else
206                                 printf("Didn't unlink nsifadr from list\n");
207                 }
208                 IFAFREE((&oia->ia_ifa));
209                 if (0 == --ns_interfaces) {
210                         /*
211                          * We reset to virginity and start all over again
212                          */
213                         ns_thishost = ns_zerohost;
214                 }
215                 return (0);
216
217         case SIOCAIFADDR:
218                 dstIsNew = 0; hostIsNew = 1;
219                 if (ia->ia_addr.sns_family == AF_NS) {
220                         if (ifra->ifra_addr.sns_len == 0) {
221                                 ifra->ifra_addr = ia->ia_addr;
222                                 hostIsNew = 0;
223                         } else if (ns_neteq(ifra->ifra_addr.sns_addr,
224                                          ia->ia_addr.sns_addr))
225                                 hostIsNew = 0;
226                 }
227                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
228                     (ifra->ifra_dstaddr.sns_family == AF_NS)) {
229                         if (hostIsNew == 0)
230                                 ns_ifscrub(ifp, (struct ns_ifaddr *)ia);
231                         ia->ia_dstaddr = ifra->ifra_dstaddr;
232                         dstIsNew  = 1;
233                 }
234                 if (ifra->ifra_addr.sns_family == AF_NS &&
235                                             (hostIsNew || dstIsNew))
236                         error = ns_ifinit(ifp, (struct ns_ifaddr *)ia,
237                                                 &ifra->ifra_addr, 0);
238                 return (error);
239
240         default:
241                 if (ifp->if_ioctl == 0)
242                         return (EOPNOTSUPP);
243                 return ((*ifp->if_ioctl)(ifp, cmd, data, (struct ucred *)NULL));
244         }
245 }
246
247 /*
248 * Delete any previous route for an old address.
249 */
250 void
251 ns_ifscrub(ifp, ia)
252         struct ifnet *ifp;
253         struct ns_ifaddr *ia;
254 {
255         if (ia->ia_flags & IFA_ROUTE) {
256                 if (ifp->if_flags & IFF_POINTOPOINT) {
257                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
258                 } else
259                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
260                 ia->ia_flags &= ~IFA_ROUTE;
261         }
262 }
263 /*
264  * Initialize an interface's internet address
265  * and routing table entry.
266  */
267 int
268 ns_ifinit(ifp, ia, sns, scrub)
269         struct ifnet *ifp;
270         struct ns_ifaddr *ia;
271         struct sockaddr_ns *sns;
272         int scrub;
273 {
274         struct sockaddr_ns oldaddr;
275         union ns_host *h = &ia->ia_addr.sns_addr.x_host;
276         int s = splimp(), error;
277
278         /*
279          * Set up new addresses.
280          */
281         oldaddr = ia->ia_addr;
282         ia->ia_addr = *sns;
283         /*
284          * The convention we shall adopt for naming is that
285          * a supplied address of zero means that "we don't care".
286          * if there is a single interface, use the address of that
287          * interface as our 6 byte host address.
288          * if there are multiple interfaces, use any address already
289          * used.
290          *
291          * Give the interface a chance to initialize
292          * if this is its first address,
293          * and to validate the address if necessary.
294          */
295         if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
296                 if (ifp->if_ioctl &&
297                      (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, 
298                                                 (caddr_t)ia,
299                                                 (struct ucred *)NULL))) {
300                         ia->ia_addr = oldaddr;
301                         splx(s);
302                         return (error);
303                 }
304                 ns_thishost = *h;
305         } else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
306             || ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
307                 *h = ns_thishost;
308                 if (ifp->if_ioctl &&
309                      (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, 
310                                                 (caddr_t)ia,
311                                                 (struct ucred *)NULL))) {
312                         ia->ia_addr = oldaddr;
313                         splx(s);
314                         return (error);
315                 }
316                 if (!ns_hosteqnh(ns_thishost,*h)) {
317                         ia->ia_addr = oldaddr;
318                         splx(s);
319                         return (EINVAL);
320                 }
321         } else {
322                 ia->ia_addr = oldaddr;
323                 splx(s);
324                 return (EINVAL);
325         }
326         ia->ia_ifa.ifa_metric = ifp->if_metric;
327         /*
328          * Add route for the network.
329          */
330         if (scrub) {
331                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
332                 ns_ifscrub(ifp, ia);
333                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
334         }
335         if (ifp->if_flags & IFF_POINTOPOINT)
336                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
337         else {
338                 ia->ia_broadaddr.sns_addr.x_net = ia->ia_addr.sns_addr.x_net;
339                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
340         }
341         ia->ia_flags |= IFA_ROUTE;
342         return (0);
343 }
344
345 /*
346  * Return address info for specified internet network.
347  */
348 struct ns_ifaddr *
349 ns_iaonnetof(dst)
350         struct ns_addr *dst;
351 {
352         struct ns_ifaddr *ia;
353         struct ns_addr *compare;
354         struct ifnet *ifp;
355         struct ns_ifaddr *ia_maybe = 0;
356         union ns_net net = dst->x_net;
357
358         for (ia = ns_ifaddr; ia; ia = ia->ia_next) {
359                 if ((ifp = ia->ia_ifp) != NULL) {
360                         if (ifp->if_flags & IFF_POINTOPOINT) {
361                                 compare = &satons_addr(ia->ia_dstaddr);
362                                 if (ns_hosteq(*dst, *compare))
363                                         return (ia);
364                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
365                                         ia_maybe = ia;
366                         } else {
367                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
368                                         return (ia);
369                         }
370                 }
371         }
372         return (ia_maybe);
373 }
374 #endif