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. Any value of unsigned int32 is valid.
Signed-off-by: Laszlo Attila Toth <panther@xxxxxxxxxx>
---
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..ea2d46a 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(__u32 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 f28f91c..cdef533 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");
@@ -146,6 +148,7 @@ 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];
@@ -198,6 +201,14 @@ 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..8837e4f 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(__u32 id, char *buf, int len)
+{
+ if (id>=256) {
+ snprintf(buf, len, "0x%x", 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, 0);
+ if (!end || end == arg || *end)
+ 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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