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Date:	Fri, 26 Oct 2007 14:30:35 +0200
From:	Laszlo Attila Toth <panther@...abit.hu>
To:	David Miller <davem@...emloft.net>
Cc:	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	Laszlo Attila Toth <panther@...abit.hu>
Subject: [IFGROUPv5 iproute 2/2] Interface group as new ip link option

Interfaces can be grouped and each group has an unique positive integer ID.
It can be set via ip link. Symbolic names can be specified in
/etc/iproute2/rt_ifgroup.

Signed-off-by: Laszlo Attila Toth <panther@...abit.hu>
---
 include/linux/if_link.h |    2 +
 include/rt_names.h      |    2 +
 ip/ipaddress.c          |    4 +++
 ip/iplink.c             |   11 ++++++++
 lib/rt_names.c          |   62 +++++++++++++++++++++++++++++++++++++++++++++++
 man/man8/ip.8           |    5 ++++
 6 files changed, 86 insertions(+), 0 deletions(-)

diff --git a/include/linux/if_link.h b/include/linux/if_link.h
index c948395..5a2d071 100644
--- a/include/linux/if_link.h
+++ b/include/linux/if_link.h
@@ -79,6 +79,8 @@ enum
 	IFLA_LINKINFO,
 #define IFLA_LINKINFO IFLA_LINKINFO
 	IFLA_NET_NS_PID,
+	IFLA_IFGROUP,
+#define	IFLA_IFGROUP IFLA_IFGROUP
 	__IFLA_MAX
 };
 
diff --git a/include/rt_names.h b/include/rt_names.h
index 07a10e0..72c5247 100644
--- a/include/rt_names.h
+++ b/include/rt_names.h
@@ -8,11 +8,13 @@ char* rtnl_rtscope_n2a(int id, char *buf, int len);
 char* rtnl_rttable_n2a(__u32 id, char *buf, int len);
 char* rtnl_rtrealm_n2a(int id, char *buf, int len);
 char* rtnl_dsfield_n2a(int id, char *buf, int len);
+char* rtnl_ifgroup_n2a(int id, char *buf, int len);
 int rtnl_rtprot_a2n(__u32 *id, char *arg);
 int rtnl_rtscope_a2n(__u32 *id, char *arg);
 int rtnl_rttable_a2n(__u32 *id, char *arg);
 int rtnl_rtrealm_a2n(__u32 *id, char *arg);
 int rtnl_dsfield_a2n(__u32 *id, char *arg);
+int rtnl_ifgroup_a2n(__u32 *id, char *arg);
 
 const char *inet_proto_n2a(int proto, char *buf, int len);
 int inet_proto_a2n(char *buf);
diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index d1c6620..1ecbe03 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -227,6 +227,10 @@ int print_linkinfo(const struct sockaddr_nl *who,
 		fprintf(fp, "mtu %u ", *(int*)RTA_DATA(tb[IFLA_MTU]));
 	if (tb[IFLA_QDISC])
 		fprintf(fp, "qdisc %s ", (char*)RTA_DATA(tb[IFLA_QDISC]));
+	if (tb[IFLA_IFGROUP]) {
+		SPRINT_BUF(b1);
+		fprintf(fp, "group %s ", rtnl_ifgroup_n2a(*(int*)RTA_DATA(tb[IFLA_IFGROUP]), b1, sizeof(b1)));
+	}
 #ifdef IFLA_MASTER
 	if (tb[IFLA_MASTER]) {
 		SPRINT_BUF(b1);
diff --git a/ip/iplink.c b/ip/iplink.c
index 8e0ed2a..71bd240 100644
--- a/ip/iplink.c
+++ b/ip/iplink.c
@@ -27,6 +27,7 @@
 #include <string.h>
 #include <sys/ioctl.h>
 #include <linux/sockios.h>
+#include <linux/rtnetlink.h>
 
 #include "rt_names.h"
 #include "utils.h"
@@ -46,6 +47,7 @@ void iplink_usage(void)
 	fprintf(stderr, "	                     promisc { on | off } |\n");
 	fprintf(stderr, "	                     trailers { on | off } |\n");
 	fprintf(stderr, "	                     txqueuelen PACKETS |\n");
+	fprintf(stderr, "	                     group GROUP |\n");
 	fprintf(stderr, "	                     name NEWNAME |\n");
 	fprintf(stderr, "	                     address LLADDR | broadcast LLADDR |\n");
 	fprintf(stderr, "	                     mtu MTU }\n");
@@ -145,6 +147,7 @@ static int iplink_have_newlink(void)
 static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
 {
 	int qlen = -1;
+	__u32 group = 0;
 	int mtu = -1;
 	int len;
 	char abuf[32];
@@ -197,6 +200,14 @@ static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
 			if (get_integer(&qlen,  *argv, 0))
 				invarg("Invalid \"txqueuelen\" value\n", *argv);
 			addattr_l(&req.n, sizeof(req), IFLA_TXQLEN, &qlen, 4);
+		} else if (matches(*argv, "group") == 0) {
+			NEXT_ARG();
+			if (group != 0)
+				duparg("group", *argv);
+
+			if (rtnl_ifgroup_a2n(&group, *argv))
+				invarg("\"group\" value is invalid\n", *argv);
+			addattr_l(&req.n, sizeof(req), IFLA_IFGROUP, &group, sizeof(group));
 		} else if (strcmp(*argv, "mtu") == 0) {
 			NEXT_ARG();
 			if (mtu != -1)
diff --git a/lib/rt_names.c b/lib/rt_names.c
index 8d019a0..a067e74 100644
--- a/lib/rt_names.c
+++ b/lib/rt_names.c
@@ -446,3 +446,65 @@ int rtnl_dsfield_a2n(__u32 *id, char *arg)
 	return 0;
 }
 
+static char * rtnl_rtifgroup_tab[256] = {
+	"0",
+};
+
+static int rtnl_rtifgroup_init;
+
+static void rtnl_rtifgroup_initialize(void)
+{
+	rtnl_rtifgroup_init = 1;
+	rtnl_tab_initialize("/etc/iproute2/rt_ifgroup",
+			    rtnl_rtifgroup_tab, 256);
+}
+
+char * rtnl_ifgroup_n2a(int id, char *buf, int len)
+{
+	if (id<0 || id>=256) {
+		snprintf(buf, len, "%d", id);
+		return buf;
+	}
+	if (!rtnl_rtifgroup_tab[id]) {
+		if (!rtnl_rtifgroup_init)
+			rtnl_rtifgroup_initialize();
+	}
+	if (rtnl_rtifgroup_tab[id])
+		return rtnl_rtifgroup_tab[id];
+	snprintf(buf, len, "0x%02x", id);
+	return buf;
+}
+
+
+int rtnl_ifgroup_a2n(__u32 *id, char *arg)
+{
+	static char *cache = NULL;
+	static unsigned long res;
+	char *end;
+	int i;
+
+	if (cache && strcmp(cache, arg) == 0) {
+		*id = res;
+		return 0;
+	}
+
+	if (!rtnl_rtifgroup_init)
+		rtnl_rtifgroup_initialize();
+
+	for (i=0; i<256; i++) {
+		if (rtnl_rtifgroup_tab[i] &&
+		    strcmp(rtnl_rtifgroup_tab[i], arg) == 0) {
+			cache = rtnl_rtifgroup_tab[i];
+			res = i;
+			*id = res;
+			return 0;
+		}
+	}
+
+	res = strtoul(arg, &end, 16);
+	if (!end || end == arg || *end || res > 255)
+		return -1;
+	*id = res;
+	return 0;
+}
+
diff --git a/man/man8/ip.8 b/man/man8/ip.8
index 8fd6d52..0338dab 100644
--- a/man/man8/ip.8
+++ b/man/man8/ip.8
@@ -511,6 +511,11 @@ already configured.
 change the transmit queue length of the device.
 
 .TP
+.BI group " GROUP"
+.TP 
+change the interface group identifier of the device.
+
+.TP
 .BI mtu " NUMBER"
 change the 
 .I MTU
-- 
1.5.2.5

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