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29 * $FreeBSD: head/sbin/ifconfig/ifclone.c 194799 2009-06-23 23:49:52Z delphij $
33 #include <sys/queue.h>
34 #include <sys/types.h>
35 #include <sys/ioctl.h>
36 #include <sys/socket.h>
50 struct if_clonereq ifcr;
55 s = socket(AF_INET, SOCK_DGRAM, 0);
57 err(1, "socket(AF_INET,SOCK_DGRAM)");
59 memset(&ifcr, 0, sizeof(ifcr));
61 if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
62 err(1, "SIOCIFGCLONERS for count");
64 buf = malloc(ifcr.ifcr_total * IFNAMSIZ);
66 err(1, "unable to allocate cloner name buffer");
68 ifcr.ifcr_count = ifcr.ifcr_total;
69 ifcr.ifcr_buffer = buf;
71 if (ioctl(s, SIOCIFGCLONERS, &ifcr) < 0)
72 err(1, "SIOCIFGCLONERS for names");
75 * In case some disappeared in the mean time, clamp it down.
77 if (ifcr.ifcr_count > ifcr.ifcr_total)
78 ifcr.ifcr_count = ifcr.ifcr_total;
80 for (cp = buf, idx = 0; idx < ifcr.ifcr_count; idx++, cp += IFNAMSIZ) {
91 char ifprefix[IFNAMSIZ];
92 clone_callback_func *clone_cb;
93 SLIST_ENTRY(clone_defcb) next;
96 static SLIST_HEAD(, clone_defcb) clone_defcbh =
97 SLIST_HEAD_INITIALIZER(clone_defcbh);
100 clone_setdefcallback(const char *ifprefix, clone_callback_func *p)
102 struct clone_defcb *dcp;
104 dcp = malloc(sizeof(*dcp));
105 strlcpy(dcp->ifprefix, ifprefix, IFNAMSIZ-1);
107 SLIST_INSERT_HEAD(&clone_defcbh, dcp, next);
111 * Do the actual clone operation. Any parameters must have been
112 * setup by now. If a callback has been setup to do the work
113 * then defer to it; otherwise do a simple create operation with
117 ifclonecreate(int s, void *arg)
120 struct clone_defcb *dcp;
121 clone_callback_func *clone_cb = NULL;
123 memset(&ifr, 0, sizeof(ifr));
124 (void) strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
126 if (clone_cb == NULL) {
127 /* Try to find a default callback */
128 SLIST_FOREACH(dcp, &clone_defcbh, next) {
129 if (strncmp(dcp->ifprefix, ifr.ifr_name,
130 strlen(dcp->ifprefix)) == 0) {
131 clone_cb = dcp->clone_cb;
136 if (clone_cb == NULL) {
137 /* NB: no parameters */
138 if (ioctl(s, SIOCIFCREATE2, &ifr) < 0)
139 err(1, "SIOCIFCREATE2");
145 * If we get a different name back than we put in, print it.
147 if (strncmp(name, ifr.ifr_name, sizeof(name)) != 0) {
148 strlcpy(name, ifr.ifr_name, sizeof(name));
149 printf("%s\n", name);
154 DECL_CMD_FUNC(clone_create, arg, d)
156 callback_register(ifclonecreate, NULL);
160 DECL_CMD_FUNC(clone_destroy, arg, d)
162 (void) strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
163 if (ioctl(s, SIOCIFDESTROY, &ifr) < 0)
164 err(1, "SIOCIFDESTROY");
167 static struct cmd clone_cmds[] = {
168 DEF_CLONE_CMD("create", 0, clone_create),
169 DEF_CMD("destroy", 0, clone_destroy),
170 DEF_CLONE_CMD("plumb", 0, clone_create),
171 DEF_CMD("unplumb", 0, clone_destroy),
175 clone_Copt_cb(const char *optarg __unused)
180 static struct option clone_Copt = { .opt = "C", .opt_usage = "[-C]", .cb = clone_Copt_cb };
182 static __constructor void
185 #define N(a) (sizeof(a) / sizeof(a[0]))
188 for (i = 0; i < N(clone_cmds); i++)
189 cmd_register(&clone_cmds[i]);
190 opt_register(&clone_Copt);