introduce "interface groups"

by "ifconfig fxp0 group foobar" "ifconfig xl0 group foobar"
these two interfaces are in one group.
Every interface has its if-family as default group.

idea/design from henning@, based on some work/disucssion from Joris Vink.

henning@, mcbride@ ok.

2 files changed, 157 insertions, 2 deletions

diff --git a/sys/net/if.c b/sys/net/if.c
index 1beb9f670e0..de1e3ced9f6 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if.c,v 1.88 2004/05/29 17:54:45 jcs Exp $	*/
+/*	$OpenBSD: if.c,v 1.89 2004/06/25 18:24:23 pb Exp $	*/
 /*	$NetBSD: if.c,v 1.35 1996/05/07 05:26:04 thorpej Exp $	*/
 
 /*
@@ -166,7 +166,9 @@ void
 if_attachsetup(ifp)
 	struct ifnet *ifp;
 {
+	struct ifgroup *ifg;
 	struct ifaddr *ifa;
+	int n;
 	int wrapped = 0;
 
 	if (ifindex2ifnet == 0)
@@ -237,6 +239,19 @@ if_attachsetup(ifp)
 		ifindex2ifnet = (struct ifnet **)q;
 	}
 
+	/* setup the group list */
+	TAILQ_INIT(&ifp->if_groups);
+	ifg = (struct ifgroup *)malloc(sizeof(struct ifgroup), M_TEMP,
+	    M_NOWAIT);
+	if (ifg != NULL) {
+		for (n = 0;
+		    ifp->if_xname[n] < '0' || ifp->if_xname[n] > '9';
+		    n++)
+			continue;
+		strlcpy(ifg->if_group, ifp->if_xname, n + 1);
+		TAILQ_INSERT_HEAD(&ifp->if_groups, ifg, group_list);
+ 	}
+
 	ifindex2ifnet[if_index] = ifp;
 
 	if (ifp->if_snd.ifq_maxlen == 0)
@@ -447,6 +462,7 @@ if_detach(ifp)
 	struct ifnet *ifp;
 {
 	struct ifaddr *ifa;
+	struct ifgroup *ifg;
 	int i, s = splimp();
 	struct radix_node_head *rnh;
 	struct domain *dp;
@@ -577,6 +593,13 @@ do { \
 
 		free(ifa, M_IFADDR);
 	}
+
+	for (ifg = TAILQ_FIRST(&ifp->if_groups); ifg;
+	    ifg = TAILQ_FIRST(&ifp->if_groups)) {
+		TAILQ_REMOVE(&ifp->if_groups, ifg, group_list);
+		free(ifg, M_TEMP);
+	}
+
 	if_free_sadl(ifp);
 
 	free(ifnet_addrs[ifp->if_index], M_IFADDR);
@@ -1250,6 +1273,25 @@ ifioctl(so, cmd, data, p)
 		}
 		break;
 
+	case SIOCAIFGROUP:
+		if ((error = suser(p, 0)) != 0)
+			return (error);
+		if ((error = if_addgroup((struct ifgroupreq *)data, ifp)))
+			return (error);
+		break;
+
+	case SIOCGIFGROUP:
+		if ((error = if_getgroup(data, ifp)))
+			return (error);
+		break;
+
+	case SIOCDIFGROUP:
+                if ((error = suser(p, 0)) != 0)
+                        return (error);
+                if ((error = if_delgroup((struct ifgroupreq *)data, ifp)))
+                        return (error);
+                break;
+
 	default:
 		if (so->so_proto == 0)
 			return (EOPNOTSUPP);
@@ -1456,6 +1498,90 @@ if_detached_watchdog(struct ifnet *ifp)
 }
 
 /*
+ * Add a group to an interface
+ */
+int
+if_addgroup(struct ifgroupreq *ifg, struct ifnet *ifp)
+{
+	struct ifgroup	*ifgnew, *ifgp;
+
+	TAILQ_FOREACH(ifgp, &ifp->if_groups, group_list)
+		if (!strcmp(ifgp->if_group, ifg->ifg_group))
+			return (EEXIST);
+
+	ifgnew = (struct ifgroup *)malloc(sizeof(struct ifgroup), M_TEMP, 
+	    M_NOWAIT);
+	if (ifgnew == NULL)
+		return (ENOMEM);
+	strlcpy(ifgnew->if_group, ifg->ifg_group, IFNAMSIZ);
+	TAILQ_INSERT_TAIL(&ifp->if_groups, ifgnew, group_list);
+
+	return (0);
+}
+
+/*
+ * Remove a group from an interface
+ * note: the first group is the if-family - do not remove
+ */
+int
+if_delgroup(struct ifgroupreq *ifg, struct ifnet *ifp)
+{
+	struct ifgroup	*ifgp;
+
+	for (ifgp = TAILQ_FIRST(&ifp->if_groups);
+	    ifgp != TAILQ_END(&ifp->if_groups);
+	    ifgp = TAILQ_NEXT(ifgp, group_list)) {
+		if (ifgp == TAILQ_FIRST(&ifp->if_groups) &&
+		    !strcmp(ifgp->if_group, ifg->ifg_group))
+			return (EPERM);
+		if (!strcmp(ifgp->if_group, ifg->ifg_group)) {
+			TAILQ_REMOVE(&ifp->if_groups, ifgp, group_list);
+			free(ifgp, M_TEMP);
+			return (0);
+		}
+	}
+
+	return (ENOENT);
+}
+
+/*
+ * Stores all groups from an interface in memory pointed
+ * to by data
+ */
+int
+if_getgroup(caddr_t data, struct ifnet *ifp)
+{
+	int len;
+	int error;
+	struct ifgroup *ifgp, *ifgp2, ifg;
+	struct ifgroupreq *ifgr = (struct ifgroupreq *)data;
+
+	if (ifgr->ifg_len == 0) {
+		TAILQ_FOREACH(ifgp, &ifp->if_groups, group_list)
+			ifgr->ifg_len += sizeof(struct ifgroup);
+		return (0);
+	}
+
+	len = ifgr->ifg_len;
+	ifgp = ifgr->ifg_groups;
+	for (ifgp2 = TAILQ_FIRST(&ifp->if_groups); ifgp2 && 
+	    len >= sizeof(struct ifgroup);
+	    ifgp2 = TAILQ_NEXT(ifgp2, group_list)) {
+		memset(&ifg, 0, sizeof(struct ifgroup));
+		strlcpy(ifg.if_group, ifgp2->if_group, IFNAMSIZ);
+		error = copyout((caddr_t)&ifg, (caddr_t)ifgp, 
+		    sizeof(struct ifgroup));
+		if (error)
+			return (error);
+		ifgp++;
+		len -= sizeof(struct ifgroup);
+	}
+
+	return (0);
+}
+
+		
+/*
  * Set/clear promiscuous mode on interface ifp based on the truth value
  * of pswitch.  The calls are reference counted so that only the first
  * "on" request actually has an effect, as does the final "off" request.
diff --git a/sys/net/if.h b/sys/net/if.h
index f67484436c2..ebcf9625a51 100644
--- a/sys/net/if.h
+++ b/sys/net/if.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if.h,v 1.54 2004/06/20 00:38:21 beck Exp $	*/
+/*	$OpenBSD: if.h,v 1.55 2004/06/25 18:24:23 pb Exp $	*/
 /*	$NetBSD: if.h,v 1.23 1996/05/07 02:40:27 thorpej Exp $	*/
 
 /*
@@ -174,6 +174,7 @@ struct ifnet {				/* and the entries */
 	void	*if_softc;		/* lower-level data for this if */
 	TAILQ_ENTRY(ifnet) if_list;	/* all struct ifnets are chained */
 	TAILQ_HEAD(, ifaddr) if_addrlist; /* linked list of addresses per if */
+	TAILQ_HEAD(, ifgroup) if_groups; /* linked list of groups per if */
 	struct hook_desc_head *if_addrhooks; /* address change callbacks */
 	char	if_xname[IFNAMSIZ];	/* external name (name + unit) */
 	int	if_pcount;		/* number of promiscuous listeners */
@@ -397,6 +398,31 @@ struct if_announcemsghdr {
 #define IFAN_DEPARTURE	1	/* interface departure */
 
 /*
+ * The groups on an interface
+ */
+struct ifgroup {
+	char if_group[IFNAMSIZ];
+	TAILQ_ENTRY(ifgroup) group_list;
+};
+
+/*
+ * Used to lookup groups for an interface
+ */
+struct ifgroupreq {
+	char if_name[IFNAMSIZ];
+	u_int ifg_len;
+
+	union {
+		char if_group[IFNAMSIZ];
+		struct ifgroup *ifg;
+	} ifg_ifgu;
+
+	TAILQ_ENTRY(ifgroupreq) next_if;
+#define ifg_group	ifg_ifgu.if_group
+#define ifg_groups	ifg_ifgu.ifg
+};
+
+/*
  * Interface request structure used for socket
  * ioctl's.  All interface ioctl's must have parameter
  * definitions which begin with ifr_name.  The
@@ -619,6 +645,9 @@ int	ifconf(u_long, caddr_t);
 void	ifinit(void);
 int	ifioctl(struct socket *, u_long, caddr_t, struct proc *);
 int	ifpromisc(struct ifnet *, int);
+int	if_addgroup(struct ifgroupreq *, struct ifnet *);
+int	if_delgroup(struct ifgroupreq *, struct ifnet *);
+int	if_getgroup(caddr_t, struct ifnet *);
 struct	ifnet *ifunit(const char *);
 
 struct	ifaddr *ifa_ifwithaddr(struct sockaddr *);