1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /*
27 * DL_IPV4 MAC Type plugin for the Nemo mac module
28 */
29
30 #include <sys/types.h>
31 #include <sys/modctl.h>
32 #include <sys/dlpi.h>
33 #include <sys/mac.h>
34 #include <sys/mac_ipv4.h>
35 #include <sys/byteorder.h>
36 #include <sys/strsun.h>
37 #include <netinet/in.h>
38 #include <netinet/ip.h>
39 #include <inet/common.h>
40 #include <inet/ip.h>
41 #include <inet/iptun.h>
42
43 static struct modlmisc mac_ipv4_modlmisc = {
44 &mod_miscops,
45 "IPv4 tunneling MAC plugin"
46 };
47
48 static struct modlinkage mac_ipv4_modlinkage = {
49 MODREV_1,
50 &mac_ipv4_modlmisc,
51 NULL
52 };
53
54 static mactype_ops_t mac_ipv4_type_ops;
55
56 int
57 _init(void)
58 {
59 mactype_register_t *mtrp;
60 int err;
61
62 if ((mtrp = mactype_alloc(MACTYPE_VERSION)) == NULL)
63 return (ENOTSUP);
64 mtrp->mtr_ident = MAC_PLUGIN_IDENT_IPV4;
65 mtrp->mtr_ops = &mac_ipv4_type_ops;
66 mtrp->mtr_mactype = DL_IPV4;
67 mtrp->mtr_nativetype = DL_IPV4;
68 mtrp->mtr_addrlen = sizeof (ipaddr_t);
69 if ((err = mactype_register(mtrp)) == 0) {
70 if ((err = mod_install(&mac_ipv4_modlinkage)) != 0)
71 (void) mactype_unregister(MAC_PLUGIN_IDENT_IPV4);
72 }
73 mactype_free(mtrp);
74 return (err);
75 }
76
77 int
78 _fini(void)
79 {
80 int err;
81 if ((err = mactype_unregister(MAC_PLUGIN_IDENT_IPV4)) != 0)
82 return (err);
83 return (mod_remove(&mac_ipv4_modlinkage));
84 }
85
86 int
87 _info(struct modinfo *modinfop)
88 {
89 return (mod_info(&mac_ipv4_modlinkage, modinfop));
90 }
91
92 /*
93 * MAC Type plugin operations
94 */
95
96 /* ARGSUSED */
97 int
98 mac_ipv4_unicst_verify(const void *addr, void *pdata)
99 {
100 const ipaddr_t *ipaddr = addr;
101 return ((CLASSD(*ipaddr) || (*ipaddr == INADDR_BROADCAST)) ?
102 EINVAL : 0);
103 }
104
105 /* ARGSUSED */
106 int
107 mac_ipv4_multicst_verify(const void *addr, void *pdata)
108 {
109 /*
110 * IPv4 configured tunnels do not have the concept of link-layer
111 * multicast.
112 */
113 return (ENOTSUP);
114 }
115
116 /*
117 * Check the legality of an IPv4 tunnel SAP value. The only two acceptable
118 * values are IPPROTO_ENCAP (IPv4 in IPv4) and IPPROTO_IPV6 (IPv6 in IPv4).
119 */
120 /* ARGSUSED */
121 boolean_t
122 mac_ipv4_sap_verify(uint32_t sap, uint32_t *bind_sap, void *pdata)
123 {
124 if (sap == IPPROTO_ENCAP || sap == IPPROTO_IPV6 || sap == 0) {
125 if (bind_sap != NULL)
126 *bind_sap = sap;
127 return (B_TRUE);
128 }
129 return (B_FALSE);
130 }
131
132 /*
133 * Build an IPv4 link-layer header for tunneling. If provided, the
134 * template header provided by the driver supplies the header length, type
135 * of service, don't fragment flag, ttl, and potential options (depending
136 * on the header length).
137 */
138 /* ARGSUSED */
139 mblk_t *
140 mac_ipv4_header(const void *saddr, const void *daddr, uint32_t sap, void *pdata,
141 mblk_t *payload, size_t extra_len)
142 {
143 struct ip *iphp;
144 struct ip *tmpl_iphp = pdata;
145 mblk_t *mp;
146 size_t hdr_len = sizeof (struct ip);
147
148 if (!mac_ipv4_sap_verify(sap, NULL, NULL))
149 return (NULL);
150
151 if (tmpl_iphp != NULL)
152 hdr_len = tmpl_iphp->ip_hl * sizeof (uint32_t);
153
154 if ((mp = allocb(hdr_len + extra_len, BPRI_HI)) == NULL)
155 return (NULL);
156
157 iphp = (struct ip *)mp->b_rptr;
158
159 bzero(iphp, hdr_len + extra_len);
160 if (tmpl_iphp != NULL) {
161 bcopy(tmpl_iphp, iphp, hdr_len);
162 } else {
163 iphp->ip_hl = IP_SIMPLE_HDR_LENGTH_IN_WORDS;
164 iphp->ip_off = htons(IP_DF);
165 iphp->ip_ttl = IPTUN_DEFAULT_HOPLIMIT;
166 }
167
168 iphp->ip_v = IPVERSION;
169 iphp->ip_len = 0;
170 iphp->ip_p = (uint8_t)sap;
171 bcopy(saddr, &(iphp->ip_src), sizeof (struct in_addr));
172 bcopy(daddr, &(iphp->ip_dst), sizeof (struct in_addr));
173
174 mp->b_wptr += hdr_len;
175 return (mp);
176 }
177
178 /* ARGSUSED */
179 int
180 mac_ipv4_header_info(mblk_t *mp, void *pdata, mac_header_info_t *hdr_info)
181 {
182 struct ip *iphp;
183
184 if (MBLKL(mp) < sizeof (struct ip))
185 return (EINVAL);
186
187 iphp = (struct ip *)mp->b_rptr;
188
189 /*
190 * IPv4 tunnels don't have a concept of link-layer multicast since
191 * they have fixed unicast endpoints.
192 */
193 if (mac_ipv4_unicst_verify(&iphp->ip_dst, NULL) != 0)
194 return (EINVAL);
195
196 hdr_info->mhi_hdrsize = iphp->ip_hl * sizeof (uint32_t);
197 hdr_info->mhi_pktsize = 0;
198 hdr_info->mhi_daddr = (const uint8_t *)&(iphp->ip_dst);
199 hdr_info->mhi_saddr = (const uint8_t *)&(iphp->ip_src);
200 hdr_info->mhi_origsap = hdr_info->mhi_bindsap = iphp->ip_p;
201 hdr_info->mhi_dsttype = MAC_ADDRTYPE_UNICAST;
202 return (0);
203 }
204
205 /*
206 * Plugin data is either NULL or a pointer to an IPv4 header.
207 */
208 boolean_t
209 mac_ipv4_pdata_verify(void *pdata, size_t pdata_size)
210 {
211 const struct ip *iphp = pdata;
212
213 if (pdata == NULL)
214 return (pdata_size == 0);
215 if (pdata_size < sizeof (struct ip))
216 return (B_FALSE);
217 /* Make sure that the header length field matches pdata_size */
218 return (pdata_size == iphp->ip_hl * sizeof (uint32_t));
219 }
220
221 static mactype_ops_t mac_ipv4_type_ops = {
222 MTOPS_PDATA_VERIFY,
223 mac_ipv4_unicst_verify,
224 mac_ipv4_multicst_verify,
225 mac_ipv4_sap_verify,
226 mac_ipv4_header,
227 mac_ipv4_header_info,
228 mac_ipv4_pdata_verify,
229 NULL,
230 NULL,
231 NULL
232 };