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Message-Id: <1485955803-65065-3-git-send-email-yotamg@mellanox.com>
Date: Wed, 1 Feb 2017 15:30:02 +0200
From: Yotam Gigi <yotamg@...lanox.com>
To: jhs@...atatu.com, davem@...emloft.net, netdev@...r.kernel.org,
mrv@...atatu.com, eladr@...lanox.com, jiri@...lanox.com
Cc: Yotam Gigi <yotamg@...lanox.com>
Subject: [PATCH 2/3] net: Introduce ife encapsulation module
This module is responsible for the ife encapsulation protocol
encode/decode logics. That module can:
- ife_encode: encode skb and reserve space for the ife meta header
- ife_decode: decode skb and extract the meta header size
- ife_tlv_meta_encode - encodes one tlv entry into the reserved ife
header space.
- ife_tlv_meta_decode - decodes one tlv entry from the packet
- ife_tlv_meta_next - advance to the next tlv
Reviewed-by: Jiri Pirko <jiri@...lanox.com>
Signed-off-by: Yotam Gigi <yotamg@...lanox.com>
---
MAINTAINERS | 7 +++
include/net/ife.h | 51 +++++++++++++++++
include/uapi/linux/Kbuild | 1 +
include/uapi/linux/ife.h | 18 ++++++
net/Kconfig | 1 +
net/Makefile | 1 +
net/ife/Kconfig | 16 ++++++
net/ife/Makefile | 5 ++
net/ife/ife.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++
9 files changed, 242 insertions(+)
create mode 100644 include/net/ife.h
create mode 100644 include/uapi/linux/ife.h
create mode 100644 net/ife/Kconfig
create mode 100644 net/ife/Makefile
create mode 100644 net/ife/ife.c
diff --git a/MAINTAINERS b/MAINTAINERS
index cc106f7..3017257 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6250,6 +6250,13 @@ F: include/net/cfg802154.h
F: include/net/ieee802154_netdev.h
F: Documentation/networking/ieee802154.txt
+IFE PROTOCOL
+M: Yotam Gigi <yotamg@...lanox.com>
+M: Jamal Hadi Salim <jhs@...atatu.com>
+F: net/ife
+F: include/net/ife.h
+F: include/uapi/linux/ife.h
+
IGORPLUG-USB IR RECEIVER
M: Sean Young <sean@...s.org>
L: linux-media@...r.kernel.org
diff --git a/include/net/ife.h b/include/net/ife.h
new file mode 100644
index 0000000..2d87d68
--- /dev/null
+++ b/include/net/ife.h
@@ -0,0 +1,51 @@
+#ifndef __NET_IFE_H
+#define __NET_IFE_H
+
+#include <linux/etherdevice.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <uapi/linux/ife.h>
+
+#if IS_ENABLED(CONFIG_NET_IFE)
+
+void *ife_encode(struct sk_buff *skb, u16 metalen);
+void *ife_decode(struct sk_buff *skb, u16 *metalen);
+
+void *ife_tlv_meta_decode(void *skbdata, u16 *attrtype, u16 *dlen, u16 *totlen);
+int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen,
+ const void *dval);
+
+void *ife_tlv_meta_next(void *skbdata);
+
+#else
+
+static inline void *ife_encode(struct sk_buff *skb, u16 metalen)
+{
+ return NULL;
+}
+
+static inline void *ife_decode(struct sk_buff *skb, u16 *metalen)
+{
+ return NULL;
+}
+
+static inline void *ife_tlv_meta_decode(void *skbdata, u16 *attrtype, u16 *dlen,
+ u16 *totlen)
+{
+ return NULL;
+}
+
+static inline int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen,
+ const void *dval)
+{
+ return 0;
+}
+
+static inline void *ife_tlv_meta_next(void *skbdata)
+{
+ return NULL;
+}
+
+#endif
+
+#endif /* __NET_IFE_H */
diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
index 486e050..a2e9072 100644
--- a/include/uapi/linux/Kbuild
+++ b/include/uapi/linux/Kbuild
@@ -195,6 +195,7 @@ header-y += if_tun.h
header-y += if_tunnel.h
header-y += if_vlan.h
header-y += if_x25.h
+header-y += ife.h
header-y += igmp.h
header-y += ila.h
header-y += in6.h
diff --git a/include/uapi/linux/ife.h b/include/uapi/linux/ife.h
new file mode 100644
index 0000000..2954da3
--- /dev/null
+++ b/include/uapi/linux/ife.h
@@ -0,0 +1,18 @@
+#ifndef __UAPI_IFE_H
+#define __UAPI_IFE_H
+
+#define IFE_METAHDRLEN 2
+
+enum {
+ IFE_META_SKBMARK = 1,
+ IFE_META_HASHID,
+ IFE_META_PRIO,
+ IFE_META_QMAP,
+ IFE_META_TCINDEX,
+ __IFE_META_MAX
+};
+
+/*Can be overridden at runtime by module option*/
+#define IFE_META_MAX (__IFE_META_MAX - 1)
+
+#endif
diff --git a/net/Kconfig b/net/Kconfig
index ce4aee6..2f2842d 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -391,6 +391,7 @@ source "net/caif/Kconfig"
source "net/ceph/Kconfig"
source "net/nfc/Kconfig"
source "net/psample/Kconfig"
+source "net/ife/Kconfig"
config LWTUNNEL
bool "Network light weight tunnels"
diff --git a/net/Makefile b/net/Makefile
index 7d41de4..9b68155 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -71,6 +71,7 @@ obj-$(CONFIG_CEPH_LIB) += ceph/
obj-$(CONFIG_BATMAN_ADV) += batman-adv/
obj-$(CONFIG_NFC) += nfc/
obj-$(CONFIG_PSAMPLE) += psample/
+obj-$(CONFIG_NET_IFE) += ife/
obj-$(CONFIG_OPENVSWITCH) += openvswitch/
obj-$(CONFIG_VSOCKETS) += vmw_vsock/
obj-$(CONFIG_MPLS) += mpls/
diff --git a/net/ife/Kconfig b/net/ife/Kconfig
new file mode 100644
index 0000000..31e48b6
--- /dev/null
+++ b/net/ife/Kconfig
@@ -0,0 +1,16 @@
+#
+# IFE subsystem configuration
+#
+
+menuconfig NET_IFE
+ depends on NET
+ tristate "Inter-FE based on IETF ForCES InterFE LFB"
+ default n
+ help
+ Say Y here to add support of IFE encapsulation protocol
+ For details refer to netdev01 paper:
+ "Distributing Linux Traffic Control Classifier-Action Subsystem"
+ Authors: Jamal Hadi Salim and Damascene M. Joachimpillai
+
+ To compile this support as a module, choose M here: the module will
+ be called ife.
diff --git a/net/ife/Makefile b/net/ife/Makefile
new file mode 100644
index 0000000..2a90d97
--- /dev/null
+++ b/net/ife/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the IFE encapsulation protocol
+#
+
+obj-$(CONFIG_NET_IFE) += ife.o
diff --git a/net/ife/ife.c b/net/ife/ife.c
new file mode 100644
index 0000000..f360341
--- /dev/null
+++ b/net/ife/ife.c
@@ -0,0 +1,142 @@
+/*
+ * net/ife/ife.c - Inter-FE protocol based on ForCES WG InterFE LFB
+ * Copyright (c) 2015 Jamal Hadi Salim <jhs@...atatu.com>
+ * Copyright (c) 2017 Yotam Gigi <yotamg@...lanox.com>
+ *
+ * Refer to: draft-ietf-forces-interfelfb-03 and netdev01 paper:
+ * "Distributing Linux Traffic Control Classifier-Action Subsystem"
+ * Authors: Jamal Hadi Salim and Damascene M. Joachimpillai
+ *
+ * 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.
+ */
+
+#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/net_namespace.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <linux/etherdevice.h>
+#include <net/ife.h>
+
+struct ifeheadr {
+ __be16 metalen;
+ u8 tlv_data[];
+};
+
+void *ife_encode(struct sk_buff *skb, u16 metalen)
+{
+ /* OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
+ * where ORIGDATA = original ethernet header ...
+ */
+ int hdrm = metalen + IFE_METAHDRLEN;
+ int total_push = hdrm + skb->dev->hard_header_len;
+ struct ifeheadr *ifehdr;
+ struct ethhdr *iethh; /* inner ether header */
+ int skboff = 0;
+ int err;
+
+ err = skb_cow_head(skb, total_push);
+ if (unlikely(err))
+ return NULL;
+
+ iethh = (struct ethhdr *) skb->data;
+
+ __skb_push(skb, total_push);
+ memcpy(skb->data, iethh, skb->dev->hard_header_len);
+ skb_reset_mac_header(skb);
+ skboff += skb->dev->hard_header_len;
+
+ /* total metadata length */
+ ifehdr = (struct ifeheadr *) (skb->data + skboff);
+ metalen += IFE_METAHDRLEN;
+ ifehdr->metalen = htons(metalen);
+
+ return ifehdr->tlv_data;
+}
+EXPORT_SYMBOL_GPL(ife_encode);
+
+void *ife_decode(struct sk_buff *skb, u16 *metalen)
+{
+ struct ifeheadr *ifehdr;
+ int total_pull;
+ u16 ifehdrln;
+
+ ifehdr = (struct ifeheadr *) (skb->data + skb->dev->hard_header_len);
+ ifehdrln = ntohs(ifehdr->metalen);
+ total_pull = skb->dev->hard_header_len + ifehdrln;
+
+ if (unlikely(ifehdrln < 2))
+ return NULL;
+
+ if (unlikely(!pskb_may_pull(skb, total_pull)))
+ return NULL;
+
+ skb_set_mac_header(skb, total_pull);
+ __skb_pull(skb, total_pull);
+ *metalen = ifehdrln - IFE_METAHDRLEN;
+
+ return &ifehdr->tlv_data;
+}
+EXPORT_SYMBOL_GPL(ife_decode);
+
+struct meta_tlvhdr {
+ __be16 type;
+ __be16 len;
+};
+
+/* Caller takes care of presenting data in network order
+ */
+void *ife_tlv_meta_decode(void *skbdata, u16 *attrtype, u16 *dlen, u16 *totlen)
+{
+ struct meta_tlvhdr *tlv = (struct meta_tlvhdr *) skbdata;
+
+ *dlen = ntohs(tlv->len) - NLA_HDRLEN;
+ *attrtype = ntohs(tlv->type);
+
+ if (totlen)
+ *totlen = nla_total_size(*dlen);
+
+ return skbdata + sizeof(struct meta_tlvhdr);
+}
+EXPORT_SYMBOL_GPL(ife_tlv_meta_decode);
+
+void *ife_tlv_meta_next(void *skbdata)
+{
+ struct meta_tlvhdr *tlv = (struct meta_tlvhdr *) skbdata;
+ u16 tlvlen = ntohs(tlv->len);
+
+ tlvlen = NLA_ALIGN(tlvlen);
+
+ return skbdata + tlvlen;
+}
+EXPORT_SYMBOL_GPL(ife_tlv_meta_next);
+
+/* Caller takes care of presenting data in network order
+ */
+int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen, const void *dval)
+{
+ __be32 *tlv = (__be32 *) (skbdata);
+ u16 totlen = nla_total_size(dlen); /*alignment + hdr */
+ char *dptr = (char *) tlv + NLA_HDRLEN;
+ u32 htlv = attrtype << 16 | (dlen + NLA_HDRLEN);
+
+ *tlv = htonl(htlv);
+ memset(dptr, 0, totlen - NLA_HDRLEN);
+ memcpy(dptr, dval, dlen);
+
+ return totlen;
+}
+EXPORT_SYMBOL_GPL(ife_tlv_meta_encode);
+
+MODULE_AUTHOR("Jamal Hadi Salim <jhs@...atatu.com>");
+MODULE_AUTHOR("Yotam Gigi <yotamg@...lanox.com>");
+MODULE_DESCRIPTION("Inter-FE LFB action");
+MODULE_LICENSE("GPL");
--
2.4.11
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