FreeBSD/Linux Kernel Cross Reference
sys/netinet/if_atm.c
1 /* $NetBSD: if_atm.c,v 1.32 2011/02/01 19:43:12 chuck Exp $ */
2
3 /*
4 * Copyright (c) 1996 Charles D. Cranor and Washington University.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 /*
29 * IP <=> ATM address resolution.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: if_atm.c,v 1.32 2011/02/01 19:43:12 chuck Exp $");
34
35 #include "opt_inet.h"
36 #include "opt_natm.h"
37
38 #if defined(INET) || defined(INET6)
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/malloc.h>
43 #include <sys/mbuf.h>
44 #include <sys/socket.h>
45 #include <sys/time.h>
46 #include <sys/kernel.h>
47 #include <sys/errno.h>
48 #include <sys/ioctl.h>
49 #include <sys/syslog.h>
50 #include <sys/proc.h>
51
52 #include <net/if.h>
53 #include <net/if_dl.h>
54 #include <net/route.h>
55 #include <net/if_atm.h>
56
57 #include <netinet/in.h>
58 #include <netinet/in_systm.h>
59 #include <netinet/in_var.h>
60 #include <netinet/ip.h>
61 #include <netinet/if_atm.h>
62
63 #ifdef NATM
64 #include <netnatm/natm.h>
65 #endif
66
67
68 /*
69 * atm_rtrequest: handle ATM rt request (in support of generic code)
70 * inputs: "req" = request code
71 * "rt" = route entry
72 * "sa" = sockaddr
73 */
74
75 void
76 atm_rtrequest(int req, struct rtentry *rt, const struct rt_addrinfo *info)
77 {
78 struct sockaddr *gate = rt->rt_gateway;
79 struct atm_pseudoioctl api;
80 #ifdef NATM
81 const struct sockaddr_in *sin;
82 struct natmpcb *npcb = NULL;
83 const struct atm_pseudohdr *aph;
84 #endif
85 const struct ifnet *ifp = rt->rt_ifp;
86 uint8_t namelen = strlen(ifp->if_xname);
87 uint8_t addrlen = ifp->if_addrlen;
88
89 if (rt->rt_flags & RTF_GATEWAY) /* link level requests only */
90 return;
91
92 switch (req) {
93
94 case RTM_RESOLVE: /* resolve: only happens when cloning */
95 printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
96 break;
97
98 case RTM_ADD:
99
100 /*
101 * route added by a command (e.g. ifconfig, route, arp...).
102 *
103 * first check to see if this is not a host route, in which
104 * case we are being called via "ifconfig" to set the address.
105 */
106
107 if ((rt->rt_flags & RTF_HOST) == 0) {
108 union {
109 struct sockaddr sa;
110 struct sockaddr_dl sdl;
111 struct sockaddr_storage ss;
112 } u;
113
114 sockaddr_dl_init(&u.sdl, sizeof(u.ss),
115 ifp->if_index, ifp->if_type,
116 NULL, namelen, NULL, addrlen);
117 rt_setgate(rt, &u.sa);
118 gate = rt->rt_gateway;
119 break;
120 }
121
122 if ((rt->rt_flags & RTF_CLONING) != 0) {
123 printf("atm_rtrequest: cloning route detected?\n");
124 break;
125 }
126 if (gate->sa_family != AF_LINK ||
127 gate->sa_len < sockaddr_dl_measure(namelen, addrlen)) {
128 log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
129 break;
130 }
131
132 #ifdef DIAGNOSTIC
133 if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
134 #endif
135
136 #ifdef NATM
137 /*
138 * let native ATM know we are using this VCI/VPI
139 * (i.e. reserve it)
140 */
141 sin = satocsin(rt_getkey(rt));
142 if (sin->sin_family != AF_INET)
143 goto failed;
144 aph = (const struct atm_pseudohdr *)CLLADDR(satosdl(gate));
145 npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph),
146 ATM_PH_VPI(aph));
147 if (npcb == NULL)
148 goto failed;
149 npcb->npcb_flags |= NPCB_IP;
150 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
151 /* XXX: move npcb to llinfo when ATM ARP is ready */
152 rt->rt_llinfo = (void *) npcb;
153 rt->rt_flags |= RTF_LLINFO;
154 #endif
155 /*
156 * let the lower level know this circuit is active
157 */
158 memcpy(&api.aph, CLLADDR(satocsdl(gate)), sizeof(api.aph));
159 api.rxhand = NULL;
160 if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA, &api) != 0) {
161 printf("atm: couldn't add VC\n");
162 goto failed;
163 }
164
165 satosdl(gate)->sdl_type = rt->rt_ifp->if_type;
166 satosdl(gate)->sdl_index = rt->rt_ifp->if_index;
167
168 break;
169
170 failed:
171 #ifdef NATM
172 if (npcb) {
173 npcb_free(npcb, NPCB_DESTROY);
174 rt->rt_llinfo = NULL;
175 rt->rt_flags &= ~RTF_LLINFO;
176 }
177 #endif
178 rtrequest(RTM_DELETE, rt_getkey(rt), NULL,
179 rt_mask(rt), 0, NULL);
180 break;
181
182 case RTM_DELETE:
183
184 #ifdef NATM
185 /*
186 * tell native ATM we are done with this VC
187 */
188
189 if (rt->rt_flags & RTF_LLINFO) {
190 npcb_free((struct natmpcb *)rt->rt_llinfo,
191 NPCB_DESTROY);
192 rt->rt_llinfo = NULL;
193 rt->rt_flags &= ~RTF_LLINFO;
194 }
195 #endif
196 /*
197 * tell the lower layer to disable this circuit
198 */
199
200 memcpy(&api.aph, CLLADDR(satocsdl(gate)), sizeof(api.aph));
201 api.rxhand = NULL;
202 (void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS, &api);
203
204 break;
205 }
206 }
207
208 /*
209 * atmresolve:
210 * inputs:
211 * [1] "rt" = the link level route to use (or null if need to look one up)
212 * [2] "m" = mbuf containing the data to be sent
213 * [3] "dst" = sockaddr_in (IP) address of dest.
214 * output:
215 * [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
216 * return:
217 * 0 == resolve FAILED; note that "m" gets m_freem'd in this case
218 * 1 == resolve OK; desten contains result
219 *
220 * XXX: will need more work if we wish to support ATMARP in the kernel,
221 * but this is enough for PVCs entered via the "route" command.
222 */
223
224 int
225 atmresolve(struct rtentry *rt, struct mbuf *m, const struct sockaddr *dst,
226 struct atm_pseudohdr *desten /* OUT */)
227 {
228 const struct sockaddr_dl *sdl;
229
230 if (m->m_flags & (M_BCAST|M_MCAST)) {
231 log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
232 goto bad;
233 }
234
235 if (rt == NULL) {
236 rt = RTALLOC1(dst, 0);
237 if (rt == NULL) goto bad; /* failed */
238 rt->rt_refcnt--; /* don't keep LL references */
239 if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
240 (rt->rt_flags & RTF_LLINFO) == 0 ||
241 /* XXX: are we using LLINFO? */
242 rt->rt_gateway->sa_family != AF_LINK) {
243 goto bad;
244 }
245 }
246
247 /*
248 * note that rt_gateway is a sockaddr_dl which contains the
249 * atm_pseudohdr data structure for this route. we currently
250 * don't need any rt_llinfo info (but will if we want to support
251 * ATM ARP [c.f. if_ether.c]).
252 */
253
254 sdl = satocsdl(rt->rt_gateway);
255
256 /*
257 * Check the address family and length is valid, the address
258 * is resolved; otherwise, try to resolve.
259 */
260
261
262 if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
263 memcpy(desten, CLLADDR(sdl), sdl->sdl_alen);
264 return (1); /* ok, go for it! */
265 }
266
267 /*
268 * we got an entry, but it doesn't have valid link address
269 * info in it (it is prob. the interface route, which has
270 * sdl_alen == 0). dump packet. (fall through to "bad").
271 */
272
273 bad:
274 m_freem(m);
275 return (0);
276 }
277 #endif /* INET */
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