From: Jamal Hadi Salim <j...@mojatatu.com>
Example usage:
allow skb hash to be encoded as metadata
sudo tc qdisc add dev $ETH root handle 1: prio
sudo tc filter add dev $ETH parent 1: protocol ip prio 10 \
u32 match ip protocol 1 0xff flowid 1:2 \
action ife encode \
allow hashid \
dst 02:15:15:15:15:15
Note: A zero skb hash will not be sent
Alternative hard code static hashid of 11
priority 16
mark 33
sudo $TC filter add dev $ETH parent 1: protocol ip prio 10 \
u32 match ip protocol 1 0xff flowid 1:2 \
action ife encode \
type 0xDEAD \
use hashid 11 \
use prio 16 \
use mark 33 \
dst 02:15:15:15:15:15
Signed-off-by: Jamal Hadi Salim <j...@mojatatu.com>
---
net/sched/Kconfig | 5 +++
net/sched/Makefile | 1 +
net/sched/act_meta_skbhash.c | 84 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 90 insertions(+)
create mode 100644 net/sched/act_meta_skbhash.c
diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index b148302..4c0c694 100644
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -761,6 +761,11 @@ config NET_IFE_SKBPRIO
depends on NET_ACT_IFE
---help---
+config NET_IFE_SKBHASH
+ tristate "Support to encoding decoding skb hashid on IFE action"
+ depends on NET_ACT_IFE
+ ---help---
+
config NET_CLS_IND
bool "Incoming device classification"
depends on NET_CLS_U32 || NET_CLS_FW
diff --git a/net/sched/Makefile b/net/sched/Makefile
index 84bddb3..321a9bc 100644
--- a/net/sched/Makefile
+++ b/net/sched/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_NET_ACT_CONNMARK) += act_connmark.o
obj-$(CONFIG_NET_ACT_IFE) += act_ife.o
obj-$(CONFIG_NET_IFE_SKBMARK) += act_meta_mark.o
obj-$(CONFIG_NET_IFE_SKBPRIO) += act_meta_skbprio.o
+obj-$(CONFIG_NET_IFE_SKBHASH) += act_meta_skbhash.o
obj-$(CONFIG_NET_SCH_FIFO) += sch_fifo.o
obj-$(CONFIG_NET_SCH_CBQ) += sch_cbq.o
obj-$(CONFIG_NET_SCH_HTB) += sch_htb.o
diff --git a/net/sched/act_meta_skbhash.c b/net/sched/act_meta_skbhash.c
new file mode 100644
index 0000000..aba12b6
--- /dev/null
+++ b/net/sched/act_meta_skbhash.c
@@ -0,0 +1,84 @@
+/*
+ * net/sched/act_meta_skbhash.c IFE skb->hash metadata module
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * copyright Jamal Hadi Salim (2015)
+ *
+*/
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <uapi/linux/tc_act/tc_ife.h>
+#include <net/tc_act/tc_ife.h>
+
+static int skbhash_check(struct sk_buff *skb, struct tcf_meta_info *e)
+{
+ u32 skbhash = skb->hash;
+
+ if (e->metaval) {
+ skbhash = *(u32 *)e->metaval;
+ }
+ if (!skbhash)
+ return 0;
+
+ return 2/*T*/ + 2/*L*/ + 4/*v*/;
+}
+
+static int skbhash_encode(struct sk_buff *skb, void *skbdata,
+ struct tcf_meta_info *e)
+{
+ u32 skbhash = skb->hash;
+
+ return encode_meta_u32(skbhash, skbdata, e);
+}
+
+static int skbhash_decode(struct sk_buff *skb, void *data, u16 len)
+{
+ u32 skbhash = *(u32 *) data;
+
+ skb->hash = ntohl(skbhash);
+ return 0;
+}
+
+static struct tcf_meta_ops ife_skbhash_ops = {
+ .metaid = IFE_META_HASHID,
+ .metatype = NLA_U32,
+ .name = "skbhash",
+ .synopsis = "skb hash metadata",
+ .check_presence = skbhash_check,
+ .encode = skbhash_encode,
+ .decode = skbhash_decode,
+ .get = get_meta_u32,
+ .alloc = alloc_meta_u32,
+ .owner = THIS_MODULE,
+};
+
+static int __init ifeskbhash_init_module(void)
+{
+ return register_ife_op(&ife_skbhash_ops);
+}
+
+static void __exit ifeskbhash_cleanup_module(void)
+{
+ unregister_ife_op(&ife_skbhash_ops);
+}
+
+module_init(ifeskbhash_init_module);
+module_exit(ifeskbhash_cleanup_module);
+
+MODULE_AUTHOR("Jamal Hadi Salim(2015)");
+MODULE_DESCRIPTION("Inter-FE skb hash meta action");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_IFE_META(IFE_META_HASHID);
--
1.9.1
