30958d3e600f8621675e1c11e1a7b2c42e2abf3c
[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 1.14 2006/12/22 23:57:54 swildner 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 #include <sys/thread2.h>
48
49 #include <net/if.h>
50 #include <net/route.h>
51
52 #include "ns.h"
53 #include "ns_if.h"
54
55 #include "opt_ns.h"
56
57 #ifdef NS
58
59 struct ns_ifaddr *ns_ifaddr;
60 int ns_interfaces;
61
62 extern struct sockaddr_ns ns_netmask, ns_hostmask;
63
64 /*
65  * Generic internet control operations (ioctl's).
66  */
67 /* ARGSUSED */
68 int
69 ns_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
70         struct thread *td)
71 {
72         struct ifreq *ifr = (struct ifreq *)data;
73         struct ns_aliasreq *ifra = (struct ns_aliasreq *)data;
74         struct ns_ifaddr *ia;
75         struct ifaddr *ifa = NULL; /* XXX used ininitialized ?*/
76         struct ns_ifaddr *oia;
77         int dstIsNew, hostIsNew;
78         int error = 0; /* initalize because of scoping */
79
80         /*
81          * Find address for this interface, if it exists.
82          */
83         if (ifp == 0)
84                 return (EADDRNOTAVAIL);
85         for (ia = ns_ifaddr; ia; ia = ia->ia_next)
86                 if (ia->ia_ifp == ifp)
87                         break;
88
89         switch (cmd) {
90
91         case SIOCGIFADDR:
92                 if (ia == (struct ns_ifaddr *)0)
93                         return (EADDRNOTAVAIL);
94                 *(struct sockaddr_ns *)&ifr->ifr_addr = ia->ia_addr;
95                 return (0);
96
97
98         case SIOCGIFBRDADDR:
99                 if (ia == (struct ns_ifaddr *)0)
100                         return (EADDRNOTAVAIL);
101                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
102                         return (EINVAL);
103                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_broadaddr;
104                 return (0);
105
106         case SIOCGIFDSTADDR:
107                 if (ia == (struct ns_ifaddr *)0)
108                         return (EADDRNOTAVAIL);
109                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
110                         return (EINVAL);
111                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_dstaddr;
112                 return (0);
113         }
114
115 #ifdef NS_PRIV_SOCKETS
116         if ((so->so_state & SS_PRIV) == 0)
117                 return (EPERM);
118 #endif
119
120         switch (cmd) {
121         case SIOCAIFADDR:
122         case SIOCDIFADDR:
123                 if (ifra->ifra_addr.sns_family == AF_NS)
124                     for (oia = ia; ia; ia = ia->ia_next) {
125                         if (ia->ia_ifp == ifp  &&
126                             ns_neteq(ia->ia_addr.sns_addr,
127                                   ifra->ifra_addr.sns_addr))
128                             break;
129                     }
130                 if (cmd == SIOCDIFADDR && ia == 0)
131                         return (EADDRNOTAVAIL);
132                 /* FALLTHROUGH */
133
134         case SIOCSIFADDR:
135         case SIOCSIFDSTADDR:
136                 if (ia == (struct ns_ifaddr *)0) {
137                         oia = (struct ns_ifaddr *)
138                                 kmalloc(sizeof *ia, M_IFADDR, M_WAITOK);
139                         if (oia == (struct ns_ifaddr *)NULL)
140                                 return (ENOBUFS);
141                         bzero((caddr_t)oia, sizeof(*oia));
142                         if ((ia = ns_ifaddr) != NULL) {
143                                 for ( ; ia->ia_next; ia = ia->ia_next)
144                                         ;
145                                 ia->ia_next = oia;
146                         } else
147                                 ns_ifaddr = oia;
148                         ia = oia;
149
150                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
151                         ia->ia_ifp = ifp;
152                         ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
153
154                         ia->ia_ifa.ifa_netmask =
155                                 (struct sockaddr *)&ns_netmask;
156
157                         ia->ia_ifa.ifa_dstaddr =
158                                 (struct sockaddr *)&ia->ia_dstaddr;
159                         if (ifp->if_flags & IFF_BROADCAST) {
160                                 ia->ia_broadaddr.sns_family = AF_NS;
161                                 ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
162                                 ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
163                         }
164                         ns_interfaces++;
165                 }
166         }
167
168         switch (cmd) {
169         case SIOCSIFDSTADDR:
170                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
171                         return (EINVAL);
172                 if (ia->ia_flags & IFA_ROUTE) {
173                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
174                         ia->ia_flags &= ~IFA_ROUTE;
175                 }
176                 if (ifp->if_ioctl) {
177                         lwkt_serialize_enter(ifp->if_serializer);
178                         error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, 
179                                                         (caddr_t)ia,
180                                                         (struct ucred *)NULL);
181                         lwkt_serialize_exit(ifp->if_serializer);
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                                 kprintf("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                 lwkt_serialize_enter(ifp->if_serializer);
244                 error = ifp->if_ioctl(ifp, cmd, data, (struct ucred *)NULL);
245                 lwkt_serialize_exit(ifp->if_serializer);
246                 return (error);
247         }
248 }
249
250 /*
251 * Delete any previous route for an old address.
252 */
253 void
254 ns_ifscrub(struct ifnet *ifp, struct ns_ifaddr *ia)
255 {
256         if (ia->ia_flags & IFA_ROUTE) {
257                 if (ifp->if_flags & IFF_POINTOPOINT) {
258                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
259                 } else
260                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
261                 ia->ia_flags &= ~IFA_ROUTE;
262         }
263 }
264 /*
265  * Initialize an interface's internet address
266  * and routing table entry.
267  */
268 int
269 ns_ifinit(struct ifnet *ifp, struct ns_ifaddr *ia, struct sockaddr_ns *sns, int scrub)
270 {
271         struct sockaddr_ns oldaddr;
272         union ns_host *h = &ia->ia_addr.sns_addr.x_host;
273         int error;
274
275         crit_enter();
276
277         /*
278          * Set up new addresses.
279          */
280         oldaddr = ia->ia_addr;
281         ia->ia_addr = *sns;
282         /*
283          * The convention we shall adopt for naming is that
284          * a supplied address of zero means that "we don't care".
285          * if there is a single interface, use the address of that
286          * interface as our 6 byte host address.
287          * if there are multiple interfaces, use any address already
288          * used.
289          *
290          * Give the interface a chance to initialize
291          * if this is its first address,
292          * and to validate the address if necessary.
293          */
294         if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
295                 lwkt_serialize_enter(ifp->if_serializer);
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                         lwkt_serialize_exit(ifp->if_serializer);
302                         crit_exit();
303                         return (error);
304                 }
305                 lwkt_serialize_exit(ifp->if_serializer);
306                 ns_thishost = *h;
307         } else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
308             || ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
309                 *h = ns_thishost;
310                 lwkt_serialize_enter(ifp->if_serializer);
311                 if (ifp->if_ioctl &&
312                      (error = ifp->if_ioctl(ifp, SIOCSIFADDR, 
313                                                 (caddr_t)ia,
314                                                 (struct ucred *)NULL))) {
315                         ia->ia_addr = oldaddr;
316                         lwkt_serialize_exit(ifp->if_serializer);
317                         crit_exit();
318                         return (error);
319                 }
320                 lwkt_serialize_exit(ifp->if_serializer);
321                 if (!ns_hosteqnh(ns_thishost,*h)) {
322                         ia->ia_addr = oldaddr;
323                         crit_exit();
324                         return (EINVAL);
325                 }
326         } else {
327                 ia->ia_addr = oldaddr;
328                 crit_exit();
329                 return (EINVAL);
330         }
331         ia->ia_ifa.ifa_metric = ifp->if_metric;
332         /*
333          * Add route for the network.
334          */
335         if (scrub) {
336                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
337                 ns_ifscrub(ifp, ia);
338                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
339         }
340         if (ifp->if_flags & IFF_POINTOPOINT)
341                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
342         else {
343                 ia->ia_broadaddr.sns_addr.x_net = ia->ia_addr.sns_addr.x_net;
344                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
345         }
346         ia->ia_flags |= IFA_ROUTE;
347         return (0);
348 }
349
350 /*
351  * Return address info for specified internet network.
352  */
353 struct ns_ifaddr *
354 ns_iaonnetof(struct ns_addr *dst)
355 {
356         struct ns_ifaddr *ia;
357         struct ns_addr *compare;
358         struct ifnet *ifp;
359         struct ns_ifaddr *ia_maybe = 0;
360         union ns_net net = dst->x_net;
361
362         for (ia = ns_ifaddr; ia; ia = ia->ia_next) {
363                 if ((ifp = ia->ia_ifp) != NULL) {
364                         if (ifp->if_flags & IFF_POINTOPOINT) {
365                                 compare = &satons_addr(ia->ia_dstaddr);
366                                 if (ns_hosteq(*dst, *compare))
367                                         return (ia);
368                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
369                                         ia_maybe = ia;
370                         } else {
371                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
372                                         return (ia);
373                         }
374                 }
375         }
376         return (ia_maybe);
377 }
378 #endif