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 /*
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <sys/types.h>
28 #include <sys/stream.h>
29 #include <net/bpf.h>
30 #include <net/bpfdesc.h>
31 #include <inet/ipnet.h>
32
33 /*
34 * This file implements the function calls for ipnet that translate the
35 * calls from BPF into the correct arguments and functions inside of the
36 * ipnet device.
37 */
38 static const char *ipnet_bpf_name(uintptr_t);
39 static void ipnet_bpf_client_close(uintptr_t);
40 static const char *ipnet_bpf_client_name(uintptr_t);
41 static int ipnet_bpf_client_open(uintptr_t, uintptr_t *);
42 static void ipnet_bpf_close(uintptr_t);
43 static int ipnet_bpf_getdlt(uintptr_t, uint_t *);
44 static int ipnet_bpf_getlinkid(const char *, datalink_id_t *, zoneid_t);
45 static int ipnet_bpf_getzone(uintptr_t, zoneid_t *);
46 static int ipnet_bpf_open(const char *, uintptr_t *, zoneid_t);
47 static uintptr_t ipnet_bpf_promisc_add(uintptr_t, int, void *,
48 uintptr_t *, int);
49 static void ipnet_bpf_promisc_remove(uintptr_t);
50 static void ipnet_bpf_sdu_get(uintptr_t, uint_t *);
51 static int ipnet_bpf_tx(uintptr_t, mblk_t *);
52 static int ipnet_bpf_type(uintptr_t);
53
54 bpf_provider_t bpf_ipnet = {
55 BPR_IPNET,
56 ipnet_bpf_open,
57 ipnet_bpf_close,
58 ipnet_bpf_name,
59 ipnet_bpf_type,
60 ipnet_bpf_sdu_get,
61 ipnet_bpf_tx,
62 ipnet_bpf_promisc_add,
63 ipnet_bpf_promisc_remove,
64 ipnet_bpf_getlinkid,
65 ipnet_bpf_client_close,
66 ipnet_bpf_client_name,
67 ipnet_bpf_client_open,
68 ipnet_bpf_getzone,
69 ipnet_bpf_getdlt,
70 };
71
72 /*ARGSUSED*/
73 static int
ipnet_bpf_open(const char * name,uintptr_t * mhandlep,zoneid_t zoneid)74 ipnet_bpf_open(const char *name, uintptr_t *mhandlep, zoneid_t zoneid)
75 {
76 if (zoneid == ALL_ZONES)
77 zoneid = GLOBAL_ZONEID;
78 return (ipnet_open_byname(name, (ipnetif_t **)mhandlep, zoneid));
79 }
80
81 /*ARGSUSED*/
82 static void
ipnet_bpf_close(uintptr_t mhandle)83 ipnet_bpf_close(uintptr_t mhandle)
84 {
85 ipnet_close_byhandle((ipnetif_t *)mhandle);
86 }
87
88 static const char *
ipnet_bpf_name(uintptr_t mhandle)89 ipnet_bpf_name(uintptr_t mhandle)
90 {
91 return (ipnet_name((ipnetif_t *)mhandle));
92 }
93
94 /*ARGSUSED*/
95 static int
ipnet_bpf_type(uintptr_t mhandle)96 ipnet_bpf_type(uintptr_t mhandle)
97 {
98 return (DL_IPNET);
99 }
100
101 /*ARGSUSED*/
102 static void
ipnet_bpf_sdu_get(uintptr_t mhandle,uint_t * mtup)103 ipnet_bpf_sdu_get(uintptr_t mhandle, uint_t *mtup)
104 {
105 /*
106 * The choice of 65535 is arbitrary, it could be any smaller number
107 * but it does matche the current default choice of libpcap as the
108 * packet snap size.
109 */
110 *mtup = 65535;
111 }
112
113 /*ARGSUSED*/
114 static int
ipnet_bpf_tx(uintptr_t chandle,mblk_t * pkt)115 ipnet_bpf_tx(uintptr_t chandle, mblk_t *pkt)
116 {
117 /*
118 * It is not clear what it would mean to send an ipnet packet,
119 * especially since the ipnet device has been implemented to be
120 * an observation (read-only) instrument. Thus a call to send a
121 * packet using ipnet results in the packet being free'd and an
122 * error returned.
123 */
124 freemsg(pkt);
125
126 return (EBADF);
127 }
128
129 /*
130 * BPF does not provide the means to select which SAP is being sniffed,
131 * so for the purpose of ipnet, all BPF clients are in SAP promiscuous
132 * mode.
133 */
134 static uintptr_t
ipnet_bpf_promisc_add(uintptr_t chandle,int how,void * arg,uintptr_t * promisc,int flags)135 ipnet_bpf_promisc_add(uintptr_t chandle, int how, void *arg,
136 uintptr_t *promisc, int flags)
137 {
138 int newhow;
139
140 /*
141 * Map the mac values into ipnet values.
142 */
143 switch (how) {
144 case MAC_CLIENT_PROMISC_ALL :
145 newhow = DL_PROMISC_PHYS;
146 flags = IPNET_PROMISC_PHYS|IPNET_PROMISC_SAP;
147 break;
148 case MAC_CLIENT_PROMISC_MULTI :
149 newhow = DL_PROMISC_MULTI;
150 flags = IPNET_PROMISC_MULTI|IPNET_PROMISC_SAP;
151 break;
152 default :
153 newhow = 0;
154 break;
155 }
156
157 return (ipnet_promisc_add((void *)chandle, newhow,
158 arg, promisc, flags));
159 }
160
161 static void
ipnet_bpf_promisc_remove(uintptr_t phandle)162 ipnet_bpf_promisc_remove(uintptr_t phandle)
163 {
164 ipnet_promisc_remove((void *)phandle);
165 }
166
167 static int
ipnet_bpf_client_open(uintptr_t mhandle,uintptr_t * chandlep)168 ipnet_bpf_client_open(uintptr_t mhandle, uintptr_t *chandlep)
169 {
170
171 return (ipnet_client_open((ipnetif_t *)mhandle,
172 (ipnetif_t **)chandlep));
173 }
174
175 /*ARGSUSED*/
176 static void
ipnet_bpf_client_close(uintptr_t chandle)177 ipnet_bpf_client_close(uintptr_t chandle)
178 {
179 ipnet_client_close((ipnetif_t *)chandle);
180 }
181
182 static const char *
ipnet_bpf_client_name(uintptr_t chandle)183 ipnet_bpf_client_name(uintptr_t chandle)
184 {
185 return (ipnet_bpf_name(chandle));
186 }
187
188 static int
ipnet_bpf_getlinkid(const char * name,datalink_id_t * idp,zoneid_t zoneid)189 ipnet_bpf_getlinkid(const char *name, datalink_id_t *idp, zoneid_t zoneid)
190 {
191 uint_t index;
192 int error;
193 ipnet_stack_t *ips;
194
195 VERIFY((ips = ipnet_find_by_zoneid(zoneid)) != NULL);
196
197 index = 0;
198 mutex_enter(&ips->ips_event_lock);
199 error = ipnet_get_linkid_byname(name, &index, zoneid);
200 mutex_exit(&ips->ips_event_lock);
201 if (error == 0)
202 *idp = (datalink_id_t)index;
203 ipnet_rele(ips);
204 return (error);
205 }
206
207 static int
ipnet_bpf_getzone(uintptr_t handle,zoneid_t * zip)208 ipnet_bpf_getzone(uintptr_t handle, zoneid_t *zip)
209 {
210 ipnetif_t *ipnetif;
211
212 ipnetif = (ipnetif_t *)handle;
213 *zip = ipnetif->if_zoneid;
214 return (0);
215 }
216
217 /*ARGSUSED*/
218 static int
ipnet_bpf_getdlt(uintptr_t handle,uint_t * dlp)219 ipnet_bpf_getdlt(uintptr_t handle, uint_t *dlp)
220 {
221 *dlp = DL_IPNET;
222 return (0);
223 }
224