Add the notion of "cloning" of network pseudo-interface (e.g. `gif').
This allows them to be created and destroyed on the fly via ifconfig(8), rather than specifying the count in the kernel configuration file.
This commit is contained in:
thorpej
parent
87ca5edd6f
commit
1e58f22342
120
sys/net/if.c
120
sys/net/if.c
@ -1,4 +1,4 @@
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/* $NetBSD: if.c,v 1.62 2000/04/26 13:38:13 bouyer Exp $ */
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/* $NetBSD: if.c,v 1.63 2000/07/02 00:20:48 thorpej Exp $ */
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/*-
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* Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
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@ -147,6 +147,10 @@ extern void nd6_setmtu __P((struct ifnet *));
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int if_rt_walktree __P((struct radix_node *, void *));
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struct if_clone *if_clone_lookup __P((const char *, int *));
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LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
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/*
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* Network interface utility routines.
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*
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@ -479,6 +483,112 @@ if_rt_walktree(rn, v)
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return (0);
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}
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/*
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* Create a clone network interface.
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*/
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int
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if_clone_create(name)
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const char *name;
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{
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struct if_clone *ifc;
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int unit;
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ifc = if_clone_lookup(name, &unit);
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if (ifc == NULL)
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return (EINVAL);
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if (ifunit(name) != NULL)
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return (EEXIST);
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return ((*ifc->ifc_create)(ifc, unit));
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}
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/*
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* Destroy a clone network interface.
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*/
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int
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if_clone_destroy(name)
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const char *name;
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{
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struct if_clone *ifc;
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struct ifnet *ifp;
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ifc = if_clone_lookup(name, NULL);
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if (ifc == NULL)
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return (EINVAL);
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ifp = ifunit(name);
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if (ifp == NULL)
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return (ENXIO);
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if (ifc->ifc_destroy == NULL)
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return (EOPNOTSUPP);
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(*ifc->ifc_destroy)(ifp);
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return (0);
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}
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/*
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* Look up a network interface cloner.
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*/
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struct if_clone *
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if_clone_lookup(name, unitp)
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const char *name;
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int *unitp;
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{
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struct if_clone *ifc;
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const char *cp;
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int i;
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for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) {
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for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
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if (ifc->ifc_name[i] != *cp)
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goto next_ifc;
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}
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goto found_name;
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next_ifc:
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ifc = LIST_NEXT(ifc, ifc_list);
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}
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/* No match. */
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return (NULL);
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found_name:
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for (i = 0; *cp != '\0'; cp++) {
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if (*cp < '0' || *cp > '9') {
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/* Bogus unit number. */
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return (NULL);
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}
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i = (i * 10) + (*cp - '0');
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}
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if (unitp != NULL)
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*unitp = i;
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return (ifc);
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}
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/*
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* Register a network interface cloner.
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*/
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void
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if_clone_attach(ifc)
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struct if_clone *ifc;
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{
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LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
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}
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/*
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* Unregister a network interface cloner.
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*/
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void
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if_clone_detach(ifc)
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struct if_clone *ifc;
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{
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LIST_REMOVE(ifc, ifc_list);
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}
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/*
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* Locate an interface based on a complete address.
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*/
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@ -860,6 +970,14 @@ ifioctl(so, cmd, data, p)
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return (ifconf(cmd, data));
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}
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ifr = (struct ifreq *)data;
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switch (cmd) {
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case SIOCIFCREATE:
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return (if_clone_create(ifr->ifr_name));
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case SIOCIFDESTROY:
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return (if_clone_destroy(ifr->ifr_name));
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}
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ifp = ifunit(ifr->ifr_name);
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if (ifp == 0)
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return (ENXIO);
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24
sys/net/if.h
24
sys/net/if.h
@ -1,4 +1,4 @@
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/* $NetBSD: if.h,v 1.50 2000/05/15 16:59:37 itojun Exp $ */
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/* $NetBSD: if.h,v 1.51 2000/07/02 00:20:49 thorpej Exp $ */
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/*-
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* Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
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@ -114,6 +114,22 @@ struct proc;
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struct rtentry;
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struct socket;
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struct ether_header;
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struct ifnet;
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/*
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* Structure describing a `cloning' interface.
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*/
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struct if_clone {
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LIST_ENTRY(if_clone) ifc_list; /* on list of cloners */
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const char *ifc_name; /* name of device, e.g. `gif' */
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size_t ifc_namelen; /* length of name */
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int (*ifc_create)(struct if_clone *, int);
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void (*ifc_destroy)(struct ifnet *);
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};
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#define IF_CLONE_INITIALIZER(name, create, destroy) \
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{ { 0 }, name, sizeof(name) - 1, create, destroy }
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/*
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* Structure defining statistics and other data kept regarding a network
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@ -582,6 +598,12 @@ struct ifaddr *ifaof_ifpforaddr __P((struct sockaddr *, struct ifnet *));
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void ifafree __P((struct ifaddr *));
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void link_rtrequest __P((int, struct rtentry *, struct sockaddr *));
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void if_clone_attach __P((struct if_clone *));
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void if_clone_detach __P((struct if_clone *));
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int if_clone_create __P((const char *));
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int if_clone_destroy __P((const char *));
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int loioctl __P((struct ifnet *, u_long, caddr_t));
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void loopattach __P((int));
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int looutput __P((struct ifnet *,
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@ -1,4 +1,4 @@
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/* $NetBSD: sockio.h,v 1.11 2000/05/13 07:55:05 itojun Exp $ */
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/* $NetBSD: sockio.h,v 1.12 2000/07/02 00:20:49 thorpej Exp $ */
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/*-
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* Copyright (c) 1982, 1986, 1990, 1993, 1994
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@ -99,4 +99,7 @@
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parameters */
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#define SIOCGDRVSPEC _IOWR('i', 123, struct ifdrv) /* get driver-specific
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parameters */
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#define SIOCIFCREATE _IOW('i', 122, struct ifreq) /* create clone if */
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#define SIOCIFDESTROY _IOW('i', 121, struct ifreq) /* destroy clone if */
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#endif /* !_SYS_SOCKIO_H_ */
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