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if_edsc.c (167896) if_edsc.c (241610)
1/*-
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93
1/*-
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93
30 * $FreeBSD: head/sys/net/if_edsc.c 167896 2007-03-26 09:05:10Z yar $
30 * $FreeBSD: head/sys/net/if_edsc.c 241610 2012-10-16 13:37:54Z glebius $
31 */
32
33/*
34 * Discard interface driver for protocol testing and timing.
35 * Mimics an Ethernet device so that VLANs can be attached to it etc.
36 */
37
38#include <sys/param.h> /* types, important constants */

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46
47#include <net/bpf.h> /* bpf(9) */
48#include <net/ethernet.h> /* Ethernet related constants and types */
49#include <net/if.h> /* basic part of ifnet(9) */
50#include <net/if_clone.h> /* network interface cloning */
51#include <net/if_types.h> /* IFT_ETHER and friends */
52#include <net/if_var.h> /* kernel-only part of ifnet(9) */
53
31 */
32
33/*
34 * Discard interface driver for protocol testing and timing.
35 * Mimics an Ethernet device so that VLANs can be attached to it etc.
36 */
37
38#include <sys/param.h> /* types, important constants */

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46
47#include <net/bpf.h> /* bpf(9) */
48#include <net/ethernet.h> /* Ethernet related constants and types */
49#include <net/if.h> /* basic part of ifnet(9) */
50#include <net/if_clone.h> /* network interface cloning */
51#include <net/if_types.h> /* IFT_ETHER and friends */
52#include <net/if_var.h> /* kernel-only part of ifnet(9) */
53
54static const char edscname[] = "edsc";
55
54/*
55 * Software configuration of an interface specific to this device type.
56 */
57struct edsc_softc {
58 struct ifnet *sc_ifp; /* ptr to generic interface configuration */
59
60 /*
61 * A non-null driver can keep various things here, for instance,
62 * the hardware revision, cached values of write-only registers, etc.
63 */
64};
65
66/*
56/*
57 * Software configuration of an interface specific to this device type.
58 */
59struct edsc_softc {
60 struct ifnet *sc_ifp; /* ptr to generic interface configuration */
61
62 /*
63 * A non-null driver can keep various things here, for instance,
64 * the hardware revision, cached values of write-only registers, etc.
65 */
66};
67
68/*
67 * Simple cloning methods.
68 * IFC_SIMPLE_DECLARE() expects precisely these names.
69 * Attach to the interface cloning framework.
69 */
70 */
71static struct if_clone *edsc_cloner;
70static int edsc_clone_create(struct if_clone *, int, caddr_t);
71static void edsc_clone_destroy(struct ifnet *);
72
73/*
74 * Interface driver methods.
75 */
76static void edsc_init(void *dummy);
77/* static void edsc_input(struct ifnet *ifp, struct mbuf *m); would be here */
78static int edsc_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
79static void edsc_start(struct ifnet *ifp);
80
81/*
82 * We'll allocate softc instances from this.
83 */
72static int edsc_clone_create(struct if_clone *, int, caddr_t);
73static void edsc_clone_destroy(struct ifnet *);
74
75/*
76 * Interface driver methods.
77 */
78static void edsc_init(void *dummy);
79/* static void edsc_input(struct ifnet *ifp, struct mbuf *m); would be here */
80static int edsc_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
81static void edsc_start(struct ifnet *ifp);
82
83/*
84 * We'll allocate softc instances from this.
85 */
84static MALLOC_DEFINE(M_EDSC, "edsc", "Ethernet discard interface");
86static MALLOC_DEFINE(M_EDSC, edscname, "Ethernet discard interface");
85
86/*
87
88/*
87 * Attach to the interface cloning framework under the name of "edsc".
88 * The second argument is the number of units to be created from
89 * the outset. It's also the minimum number of units allowed.
90 * We don't want any units created as soon as the driver is loaded.
91 */
92IFC_SIMPLE_DECLARE(edsc, 0);
93
94/*
95 * Create an interface instance.
96 */
97static int
98edsc_clone_create(struct if_clone *ifc, int unit, caddr_t params)
99{
100 struct edsc_softc *sc;
101 struct ifnet *ifp;
102 static u_char eaddr[ETHER_ADDR_LEN]; /* 0:0:0:0:0:0 */

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111 return (ENOSPC);
112 }
113
114 ifp->if_softc = sc;
115
116 /*
117 * Get a name for this particular interface in its ifnet structure.
118 */
89 * Create an interface instance.
90 */
91static int
92edsc_clone_create(struct if_clone *ifc, int unit, caddr_t params)
93{
94 struct edsc_softc *sc;
95 struct ifnet *ifp;
96 static u_char eaddr[ETHER_ADDR_LEN]; /* 0:0:0:0:0:0 */

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105 return (ENOSPC);
106 }
107
108 ifp->if_softc = sc;
109
110 /*
111 * Get a name for this particular interface in its ifnet structure.
112 */
119 if_initname(ifp, ifc->ifc_name, unit);
113 if_initname(ifp, edscname, unit);
120
121 /*
122 * Typical Ethernet interface flags: we can do broadcast and
123 * multicast but can't hear our own broadcasts or multicasts.
124 */
125 ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST | IFF_SIMPLEX;
126
127 /*

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318static int
319edsc_modevent(module_t mod, int type, void *data)
320{
321
322 switch (type) {
323 case MOD_LOAD:
324 /*
325 * Connect to the network interface cloning framework.
114
115 /*
116 * Typical Ethernet interface flags: we can do broadcast and
117 * multicast but can't hear our own broadcasts or multicasts.
118 */
119 ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST | IFF_SIMPLEX;
120
121 /*

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312static int
313edsc_modevent(module_t mod, int type, void *data)
314{
315
316 switch (type) {
317 case MOD_LOAD:
318 /*
319 * Connect to the network interface cloning framework.
320 * The last argument is the number of units to be created
321 * from the outset. It's also the minimum number of units
322 * allowed. We don't want any units created as soon as the
323 * driver is loaded.
326 */
324 */
327 if_clone_attach(&edsc_cloner);
325 edsc_cloner = if_clone_simple(edscname, edsc_clone_create,
326 edsc_clone_destroy, 0);
328 break;
329
330 case MOD_UNLOAD:
331 /*
332 * Disconnect from the cloning framework.
333 * Existing interfaces will be disposed of properly.
334 */
327 break;
328
329 case MOD_UNLOAD:
330 /*
331 * Disconnect from the cloning framework.
332 * Existing interfaces will be disposed of properly.
333 */
335 if_clone_detach(&edsc_cloner);
334 if_clone_detach(edsc_cloner);
336 break;
337
338 default:
339 /*
340 * There are other event types, but we don't handle them.
341 * See module(9).
342 */
343 return (EOPNOTSUPP);
344 }
345 return (0);
346}
347
348static moduledata_t edsc_mod = {
349 "if_edsc", /* name */
350 edsc_modevent, /* event handler */
351 NULL /* additional data */
352};
353
354DECLARE_MODULE(if_edsc, edsc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
335 break;
336
337 default:
338 /*
339 * There are other event types, but we don't handle them.
340 * See module(9).
341 */
342 return (EOPNOTSUPP);
343 }
344 return (0);
345}
346
347static moduledata_t edsc_mod = {
348 "if_edsc", /* name */
349 edsc_modevent, /* event handler */
350 NULL /* additional data */
351};
352
353DECLARE_MODULE(if_edsc, edsc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);