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authorJamal Hadi Salim <jhs@mojatatu.com>2016-09-18 14:31:43 +0300
committerDavid S. Miller <davem@davemloft.net>2016-09-20 04:55:28 +0300
commit408fbc22ef1efb00dd896acd00e9f7d9b641e047 (patch)
tree66fdcc1ead156e7b2404fbccdd8d1077765841f8 /net/sched/act_meta_skbtcindex.c
parent6a5d58b67e205f2ffc62d0a9ee4ef7d237e9a7fb (diff)
downloadlinux-408fbc22ef1efb00dd896acd00e9f7d9b641e047.tar.xz
net sched ife action: Introduce skb tcindex metadata encap decap
Sample use case of how this is encoded: user space via tuntap (or a connected VM/Machine/container) encodes the tcindex TLV. Sample use case of decoding: IFE action decodes it and the skb->tc_index is then used to classify. So something like this for encoded ICMP packets: .. first decode then reclassify... skb->tcindex will be set sudo $TC filter add dev $ETH parent ffff: prio 2 protocol 0xbeef \ u32 match u32 0 0 flowid 1:1 \ action ife decode reclassify ...next match the decode icmp packet... sudo $TC filter add dev $ETH parent ffff: prio 4 protocol ip \ u32 match ip protocol 1 0xff flowid 1:1 \ action continue ... last classify it using the tcindex classifier and do someaction.. sudo $TC filter add dev $ETH parent ffff: prio 5 protocol ip \ handle 0x11 tcindex classid 1:1 \ action blah.. Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/act_meta_skbtcindex.c')
-rw-r--r--net/sched/act_meta_skbtcindex.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/net/sched/act_meta_skbtcindex.c b/net/sched/act_meta_skbtcindex.c
new file mode 100644
index 000000000000..3b35774ce890
--- /dev/null
+++ b/net/sched/act_meta_skbtcindex.c
@@ -0,0 +1,79 @@
+/*
+ * net/sched/act_meta_tc_index.c IFE skb->tc_index 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 (2016)
+ *
+*/
+
+#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>
+#include <linux/rtnetlink.h>
+
+static int skbtcindex_encode(struct sk_buff *skb, void *skbdata,
+ struct tcf_meta_info *e)
+{
+ u32 ifetc_index = skb->tc_index;
+
+ return ife_encode_meta_u16(ifetc_index, skbdata, e);
+}
+
+static int skbtcindex_decode(struct sk_buff *skb, void *data, u16 len)
+{
+ u16 ifetc_index = *(u16 *)data;
+
+ skb->tc_index = ntohs(ifetc_index);
+ return 0;
+}
+
+static int skbtcindex_check(struct sk_buff *skb, struct tcf_meta_info *e)
+{
+ return ife_check_meta_u16(skb->tc_index, e);
+}
+
+static struct tcf_meta_ops ife_skbtcindex_ops = {
+ .metaid = IFE_META_TCINDEX,
+ .metatype = NLA_U16,
+ .name = "tc_index",
+ .synopsis = "skb tc_index 16 bit metadata",
+ .check_presence = skbtcindex_check,
+ .encode = skbtcindex_encode,
+ .decode = skbtcindex_decode,
+ .get = ife_get_meta_u16,
+ .alloc = ife_alloc_meta_u16,
+ .release = ife_release_meta_gen,
+ .validate = ife_validate_meta_u16,
+ .owner = THIS_MODULE,
+};
+
+static int __init ifetc_index_init_module(void)
+{
+ return register_ife_op(&ife_skbtcindex_ops);
+}
+
+static void __exit ifetc_index_cleanup_module(void)
+{
+ unregister_ife_op(&ife_skbtcindex_ops);
+}
+
+module_init(ifetc_index_init_module);
+module_exit(ifetc_index_cleanup_module);
+
+MODULE_AUTHOR("Jamal Hadi Salim(2016)");
+MODULE_DESCRIPTION("Inter-FE skb tc_index metadata module");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_IFE_META(IFE_META_SKBTCINDEX);