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#include <net/sockaddr_utils.h>
100
101static const u_char etherip6allnodes[ETHER_ADDR_LEN] =
102{ 0x33, 0x33, 0, 0, 0, 1 };
103
104/*
105 * Process a received Ethernet packet;
106 * the packet is in the mbuf chain m without
107 * the ether header, which is provided separately.
108 */
109static errno_t
110ether_inet6_input(ifnet_t ifp, protocol_family_t protocol,
111 mbuf_t packet, char *header)
112{
113#pragma unused(ifp, protocol)
114 struct ether_header *eh = (struct ether_header *)(void *)header;
115 u_int16_t ether_type;
116
117 bcopy(src: &eh->ether_type, dst: &ether_type, n: sizeof(ether_type));
118
119 if (ether_type == htons(ETHERTYPE_IPV6)) {
120 struct ifnet *mifp;
121 /*
122 * Trust the ifp in the mbuf, rather than ifproto's
123 * since the packet could have been injected via
124 * a dlil_input_packet_list() using an ifp that is
125 * different than the one where the packet really
126 * came from.
127 */
128 mifp = mbuf_pkthdr_rcvif(mbuf: packet);
129
130 /* Update L2 reachability record, if present (and not bcast) */
131 if (bcmp(s1: eh->ether_shost, s2: etherbroadcastaddr,
132 ETHER_ADDR_LEN) != 0) {
133 nd6_llreach_set_reachable(mifp, eh->ether_shost,
134 ETHER_ADDR_LEN);
135 }
136
137 /* Save the Ethernet source address for all-nodes multicasts */
138 if (!bcmp(s1: eh->ether_dhost, s2: etherip6allnodes, ETHER_ADDR_LEN)) {
139 struct ip6aux *ip6a;
140
141 ip6a = ip6_addaux(packet);
142 if (ip6a) {
143 ip6a->ip6a_flags |= IP6A_HASEEN;
144 bcopy(src: eh->ether_shost, dst: ip6a->ip6a_ehsrc,
145 ETHER_ADDR_LEN);
146 }
147 }
148
149 if (proto_input(protocol, packet) != 0) {
150 m_freem(packet);
151 }
152 } else {
153 m_freem(packet);
154 }
155
156 return EJUSTRETURN;
157}
158
159static errno_t
160ether_inet6_pre_output(ifnet_t ifp, protocol_family_t protocol_family,
161 mbuf_t *m0, const struct sockaddr *dst_netaddr, void *route,
162 char *type, char *edst)
163{
164#pragma unused(protocol_family)
165 errno_t result;
166 struct sockaddr_dl sdl = {};
167 struct mbuf *m = *m0;
168
169 /*
170 * Tell ether_frameout it's ok to loop packet if necessary
171 */
172 m->m_flags |= M_LOOP;
173
174 result = nd6_lookup_ipv6(interface: ifp, SIN6(dst_netaddr), ll_dest: &sdl, ll_dest_len: sizeof(sdl), hint: route, packet: *m0);
175
176 if (result == 0) {
177 u_int16_t ethertype_ipv6 = htons(ETHERTYPE_IPV6);
178
179 bcopy(src: &ethertype_ipv6, dst: type, n: sizeof(ethertype_ipv6));
180 bcopy(LLADDR(&sdl), dst: edst, n: sdl.sdl_alen);
181 }
182
183 return result;
184}
185
186static int
187ether_inet6_resolve_multi(ifnet_t ifp, const struct sockaddr *proto_addr,
188 struct sockaddr_dl *out_ll, size_t ll_len)
189{
190 static const size_t minsize =
191 offsetof(struct sockaddr_dl, sdl_data[0]) + ETHER_ADDR_LEN;
192 const struct sockaddr_in6 *sin6 =
193 SIN6(proto_addr);
194
195 if (proto_addr->sa_family != AF_INET6) {
196 return EAFNOSUPPORT;
197 }
198
199 if (proto_addr->sa_len < sizeof(struct sockaddr_in6)) {
200 return EINVAL;
201 }
202
203 if (ll_len < minsize) {
204 return EMSGSIZE;
205 }
206
207 SOCKADDR_ZERO(out_ll, minsize);
208 out_ll->sdl_len = minsize;
209 out_ll->sdl_family = AF_LINK;
210 out_ll->sdl_index = ifp->if_index;
211 out_ll->sdl_type = IFT_ETHER;
212 out_ll->sdl_nlen = 0;
213 out_ll->sdl_alen = ETHER_ADDR_LEN;
214 out_ll->sdl_slen = 0;
215 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, LLADDR(out_ll));
216
217 return 0;
218}
219
220static errno_t
221ether_inet6_prmod_ioctl(ifnet_t ifp, protocol_family_t protocol_family,
222 u_long command, void *data)
223{
224#pragma unused(protocol_family)
225 int error = 0;
226
227 switch (command) {
228 case SIOCSIFADDR: /* struct ifaddr pointer */
229 /*
230 * Note: caller of ifnet_ioctl() passes in pointer to
231 * struct ifaddr as parameter to SIOCSIFADDR, for legacy
232 * reasons.
233 */
234 if ((ifp->if_flags & IFF_RUNNING) == 0) {
235 ifnet_set_flags(interface: ifp, IFF_UP, IFF_UP);
236 ifnet_ioctl(interface: ifp, protocol: 0, SIOCSIFFLAGS, NULL);
237 }
238 break;
239
240 case SIOCGIFADDR: { /* struct ifreq */
241 struct ifreq *ifr = (struct ifreq *)(void *)data;
242 (void) ifnet_guarded_lladdr_copy_bytes(interface: ifp,
243 lladdr: ifr->ifr_addr.sa_data, ETHER_ADDR_LEN);
244 break;
245 }
246
247 default:
248 error = EOPNOTSUPP;
249 break;
250 }
251 return error;
252}
253
254errno_t
255ether_attach_inet6(struct ifnet *ifp, protocol_family_t protocol_family)
256{
257#pragma unused(protocol_family)
258 struct ifnet_attach_proto_param proto;
259 struct ifnet_demux_desc demux[1];
260 u_short en_6native = htons(ETHERTYPE_IPV6);
261 errno_t error;
262
263 bzero(s: &proto, n: sizeof(proto));
264 demux[0].type = DLIL_DESC_ETYPE2;
265 demux[0].data = &en_6native;
266 demux[0].datalen = sizeof(en_6native);
267 proto.demux_list = demux;
268 proto.demux_count = 1;
269 proto.input = ether_inet6_input;
270 proto.pre_output = ether_inet6_pre_output;
271 proto.ioctl = ether_inet6_prmod_ioctl;
272 proto.resolve = ether_inet6_resolve_multi;
273 error = ifnet_attach_protocol(interface: ifp, protocol_family, proto_details: &proto);
274 if (error && error != EEXIST) {
275 printf("WARNING: %s can't attach ipv6 to %s\n", __func__,
276 if_name(ifp));
277 }
278
279 return error;
280}
281
282void
283ether_detach_inet6(struct ifnet *ifp, protocol_family_t protocol_family)
284{
285 (void) ifnet_detach_protocol(interface: ifp, protocol_family);
286}
287