1 /*
2 * Copyright (c) 2000-2013 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /*
29 * Copyright (c) 1982, 1989, 1993
30 * The Regents of the University of California. All rights reserved.
31 *
32 * Redistribution and use in source and binary forms, with or without
33 * modification, are permitted provided that the following conditions
34 * are met:
35 * 1. Redistributions of source code must retain the above copyright
36 * notice, this list of conditions and the following disclaimer.
37 * 2. Redistributions in binary form must reproduce the above copyright
38 * notice, this list of conditions and the following disclaimer in the
39 * documentation and/or other materials provided with the distribution.
40 * 3. All advertising materials mentioning features or use of this software
41 * must display the following acknowledgement:
42 * This product includes software developed by the University of
43 * California, Berkeley and its contributors.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 */
61
62 #include <sys/param.h>
63 #include <sys/systm.h>
64 #include <sys/kernel.h>
65 #include <sys/malloc.h>
66 #include <sys/mbuf.h>
67 #include <sys/socket.h>
68 #include <sys/sockio.h>
69 #include <sys/sysctl.h>
70 #include <sys/socketvar.h>
71
72 #include <net/dlil.h>
73 #include <net/if.h>
74 #include <net/route.h>
75 #include <net/if_llc.h>
76 #include <net/if_dl.h>
77 #include <net/if_types.h>
78 #include <net/ndrv.h>
79 #include <net/kpi_protocol.h>
80 #include <net/dlil.h>
81
82 #include <netinet/in.h>
83 #include <netinet/in_var.h>
84 #include <netinet/if_ether.h>
85 #include <netinet/in_systm.h>
86 #include <netinet/ip.h>
87
88 #include <netinet6/nd6.h>
89 #include <netinet6/in6_ifattach.h>
90 #include <netinet6/ip6_var.h>
91
92 /* #include "vlan.h" */
93 #if NVLAN > 0
94 #include <net/if_vlan_var.h>
95 #endif /* NVLAN > 0 */
96
97 #include <net/ether_if_module.h>
98
99 static const u_char etherip6allnodes[ETHER_ADDR_LEN] =
100 { 0x33, 0x33, 0, 0, 0, 1 };
101
102 /*
103 * Process a received Ethernet packet;
104 * the packet is in the mbuf chain m without
105 * the ether header, which is provided separately.
106 */
107 static errno_t
ether_inet6_input(ifnet_t ifp,protocol_family_t protocol,mbuf_t packet,char * header)108 ether_inet6_input(ifnet_t ifp, protocol_family_t protocol,
109 mbuf_t packet, char *header)
110 {
111 #pragma unused(ifp, protocol)
112 struct ether_header *eh = (struct ether_header *)(void *)header;
113 u_int16_t ether_type;
114
115 bcopy(&eh->ether_type, ðer_type, sizeof(ether_type));
116
117 if (ether_type == htons(ETHERTYPE_IPV6)) {
118 struct ifnet *mifp;
119 /*
120 * Trust the ifp in the mbuf, rather than ifproto's
121 * since the packet could have been injected via
122 * a dlil_input_packet_list() using an ifp that is
123 * different than the one where the packet really
124 * came from.
125 */
126 mifp = mbuf_pkthdr_rcvif(packet);
127
128 /* Update L2 reachability record, if present (and not bcast) */
129 if (bcmp(eh->ether_shost, etherbroadcastaddr,
130 ETHER_ADDR_LEN) != 0) {
131 nd6_llreach_set_reachable(mifp, eh->ether_shost,
132 ETHER_ADDR_LEN);
133 }
134
135 /* Save the Ethernet source address for all-nodes multicasts */
136 if (!bcmp(eh->ether_dhost, etherip6allnodes, ETHER_ADDR_LEN)) {
137 struct ip6aux *ip6a;
138
139 ip6a = ip6_addaux(packet);
140 if (ip6a) {
141 ip6a->ip6a_flags |= IP6A_HASEEN;
142 bcopy(eh->ether_shost, ip6a->ip6a_ehsrc,
143 ETHER_ADDR_LEN);
144 }
145 }
146
147 if (proto_input(protocol, packet) != 0) {
148 m_freem(packet);
149 }
150 } else {
151 m_freem(packet);
152 }
153
154 return EJUSTRETURN;
155 }
156
157 static errno_t
ether_inet6_pre_output(ifnet_t ifp,protocol_family_t protocol_family,mbuf_t * m0,const struct sockaddr * dst_netaddr,void * route,char * type,char * edst)158 ether_inet6_pre_output(ifnet_t ifp, protocol_family_t protocol_family,
159 mbuf_t *m0, const struct sockaddr *dst_netaddr, void *route,
160 char *type, char *edst)
161 {
162 #pragma unused(protocol_family)
163 errno_t result;
164 struct sockaddr_dl sdl = {};
165 struct mbuf *m = *m0;
166
167 /*
168 * Tell ether_frameout it's ok to loop packet if necessary
169 */
170 m->m_flags |= M_LOOP;
171
172 result = nd6_lookup_ipv6(ifp, (const struct sockaddr_in6 *)
173 (uintptr_t)(size_t)dst_netaddr, &sdl, sizeof(sdl), route, *m0);
174
175 if (result == 0) {
176 u_int16_t ethertype_ipv6 = htons(ETHERTYPE_IPV6);
177
178 bcopy(ðertype_ipv6, type, sizeof(ethertype_ipv6));
179 bcopy(LLADDR(&sdl), edst, sdl.sdl_alen);
180 }
181
182 return result;
183 }
184
185 static int
ether_inet6_resolve_multi(ifnet_t ifp,const struct sockaddr * proto_addr,struct sockaddr_dl * out_ll,size_t ll_len)186 ether_inet6_resolve_multi(ifnet_t ifp, const struct sockaddr *proto_addr,
187 struct sockaddr_dl *out_ll, size_t ll_len)
188 {
189 static const size_t minsize =
190 offsetof(struct sockaddr_dl, sdl_data[0]) + ETHER_ADDR_LEN;
191 const struct sockaddr_in6 *sin6 =
192 (const struct sockaddr_in6 *)(uintptr_t)(size_t)proto_addr;
193
194 if (proto_addr->sa_family != AF_INET6) {
195 return EAFNOSUPPORT;
196 }
197
198 if (proto_addr->sa_len < sizeof(struct sockaddr_in6)) {
199 return EINVAL;
200 }
201
202 if (ll_len < minsize) {
203 return EMSGSIZE;
204 }
205
206 bzero(out_ll, minsize);
207 out_ll->sdl_len = minsize;
208 out_ll->sdl_family = AF_LINK;
209 out_ll->sdl_index = ifp->if_index;
210 out_ll->sdl_type = IFT_ETHER;
211 out_ll->sdl_nlen = 0;
212 out_ll->sdl_alen = ETHER_ADDR_LEN;
213 out_ll->sdl_slen = 0;
214 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, LLADDR(out_ll));
215
216 return 0;
217 }
218
219 static errno_t
ether_inet6_prmod_ioctl(ifnet_t ifp,protocol_family_t protocol_family,u_long command,void * data)220 ether_inet6_prmod_ioctl(ifnet_t ifp, protocol_family_t protocol_family,
221 u_long command, void *data)
222 {
223 #pragma unused(protocol_family)
224 int error = 0;
225
226 switch (command) {
227 case SIOCSIFADDR: /* struct ifaddr pointer */
228 /*
229 * Note: caller of ifnet_ioctl() passes in pointer to
230 * struct ifaddr as parameter to SIOCSIFADDR, for legacy
231 * reasons.
232 */
233 if ((ifp->if_flags & IFF_RUNNING) == 0) {
234 ifnet_set_flags(ifp, IFF_UP, IFF_UP);
235 ifnet_ioctl(ifp, 0, SIOCSIFFLAGS, NULL);
236 }
237 break;
238
239 case SIOCGIFADDR: { /* struct ifreq */
240 struct ifreq *ifr = (struct ifreq *)(void *)data;
241 (void) ifnet_guarded_lladdr_copy_bytes(ifp,
242 ifr->ifr_addr.sa_data, ETHER_ADDR_LEN);
243 break;
244 }
245
246 default:
247 error = EOPNOTSUPP;
248 break;
249 }
250 return error;
251 }
252
253 errno_t
ether_attach_inet6(struct ifnet * ifp,protocol_family_t protocol_family)254 ether_attach_inet6(struct ifnet *ifp, protocol_family_t protocol_family)
255 {
256 #pragma unused(protocol_family)
257 struct ifnet_attach_proto_param proto;
258 struct ifnet_demux_desc demux[1];
259 u_short en_6native = htons(ETHERTYPE_IPV6);
260 errno_t error;
261
262 bzero(&proto, sizeof(proto));
263 demux[0].type = DLIL_DESC_ETYPE2;
264 demux[0].data = &en_6native;
265 demux[0].datalen = sizeof(en_6native);
266 proto.demux_list = demux;
267 proto.demux_count = 1;
268 proto.input = ether_inet6_input;
269 proto.pre_output = ether_inet6_pre_output;
270 proto.ioctl = ether_inet6_prmod_ioctl;
271 proto.resolve = ether_inet6_resolve_multi;
272 error = ifnet_attach_protocol(ifp, protocol_family, &proto);
273 if (error && error != EEXIST) {
274 printf("WARNING: %s can't attach ipv6 to %s\n", __func__,
275 if_name(ifp));
276 }
277
278 return error;
279 }
280
281 void
ether_detach_inet6(struct ifnet * ifp,protocol_family_t protocol_family)282 ether_detach_inet6(struct ifnet *ifp, protocol_family_t protocol_family)
283 {
284 (void) ifnet_detach_protocol(ifp, protocol_family);
285 }
286