[PATCHv7 1/5][RESEND] Remove unnecessary locks from rtnetlink

[PATCHv7 1/5][RESEND] Remove unnecessary locks from rtnetlink

[Laszlo Attila Toth]

The do_setlink() function is protected by rtnl, additional locks are unnecessary.
and the set_operstate() function is called from protected parts. Locks removed
from both functions.

The set_operstate() is also called from rtnl_create_link() and from no other places.
In rtnl_create_link() none of the changes is protected by set_lock_bh() except
inside set_operstate(), different locking scheme is not necessary
for the operstate.

Signed-off-by: Laszlo Attila Toth <panther@balabit.hu>
---

 net/core/rtnetlink.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 4a07e83..f95c6c5 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -562,9 +562,7 @@ static void set_operstate(struct net_device *dev, unsigned char transition)
 	}
 
 	if (dev->operstate != operstate) {
-		write_lock_bh(&dev_base_lock);
 		dev->operstate = operstate;
-		write_unlock_bh(&dev_base_lock);
 		netdev_state_change(dev);
 	}
 }
@@ -879,9 +877,7 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
 		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
 
 	if (tb[IFLA_LINKMODE]) {
-		write_lock_bh(&dev_base_lock);
 		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
-		write_unlock_bh(&dev_base_lock);
 	}
 
 	err = 0;

[PATCHv7 2/5][RESEND] rtnetlink: send a single notification on device state changes

[Laszlo Attila Toth]

In do_setlink() a single notification is sent at the end of the function
if any modification occured. If the address has been changed, another
notification is sent.

Both of them is required because originally only the NETDEV_CHANGEADDR notification
was sent and although device state change implies address change, some programs may
expect the original notification. It remains for compatibity.

Signed-off-by: Laszlo Attila Toth <panther@balabit.hu>
---

 net/core/rtnetlink.c |   27 ++++++++++++++++++++-------
 1 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index f95c6c5..6be8608 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -542,7 +542,7 @@ int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
 
 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 
-static void set_operstate(struct net_device *dev, unsigned char transition)
+static int set_operstate(struct net_device *dev, unsigned char transition)
 {
 	unsigned char operstate = dev->operstate;
 
@@ -563,8 +563,9 @@ static void set_operstate(struct net_device *dev, unsigned char transition)
 
 	if (dev->operstate != operstate) {
 		dev->operstate = operstate;
-		netdev_state_change(dev);
-	}
+		return 1;
+	} else
+		return 0;
 }
 
 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
@@ -858,6 +859,7 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
 	if (tb[IFLA_BROADCAST]) {
 		nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
 		send_addr_notify = 1;
+		modified = 1;
 	}
 
 	if (ifm->ifi_flags || ifm->ifi_change) {
@@ -870,14 +872,21 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
 		dev_change_flags(dev, flags);
 	}
 
-	if (tb[IFLA_TXQLEN])
-		dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
+	if (tb[IFLA_TXQLEN]) {
+		if (dev->tx_queue_len != nla_get_u32(tb[IFLA_TXQLEN])) {
+			dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
+			modified = 1;
+		}
+	}
 
 	if (tb[IFLA_OPERSTATE])
-		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
+		modified |= set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
 
 	if (tb[IFLA_LINKMODE]) {
-		dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
+		if (dev->link_mode != nla_get_u8(tb[IFLA_LINKMODE])) {
+			dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
+			modified = 1;
+		} 
 	}
 
 	err = 0;
@@ -891,6 +900,10 @@ errout:
 
 	if (send_addr_notify)
 		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
+
+	if (modified)
+		netdev_state_change(dev);
+
 	return err;
 }
 

[PATCHv7 iproute2 2/2][RESEND] Interface group as new ip link option

[Laszlo Attila Toth]

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@balabit.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..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