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Commit c411ed85 authored by Jiri Benc's avatar Jiri Benc Committed by David S. Miller
Browse files

nsh: add GSO support 



Add a new nsh/ directory. It currently holds only GSO functions but more
will come: in particular, code shared by openvswitch and tc to manipulate
NSH headers.

For now, assume there's no hardware support for NSH segmentation. We can
always introduce netdev->nsh_features later.

Signed-off-by: default avatarJiri Benc <jbenc@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1f0b7744

net/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -235,6 +235,7 @@ source "net/openvswitch/Kconfig" 
source "net/vmw_vsock/Kconfig"

source "net/netlink/Kconfig"

source "net/mpls/Kconfig"

source "net/nsh/Kconfig"

source "net/hsr/Kconfig"

source "net/switchdev/Kconfig"

source "net/l3mdev/Kconfig"

net/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -75,6 +75,7 @@ obj-$(CONFIG_NET_IFE) += ife/ 
obj-$(CONFIG_OPENVSWITCH)	+= openvswitch/

obj-$(CONFIG_VSOCKETS)	+= vmw_vsock/

obj-$(CONFIG_MPLS)		+= mpls/

obj-$(CONFIG_NET_NSH)		+= nsh/

obj-$(CONFIG_HSR)		+= hsr/

ifneq ($(CONFIG_NET_SWITCHDEV),)

obj-y				+= switchdev/

net/nsh/Kconfig

0 → 100644
+9 −0
Original line number Diff line number Diff line 
menuconfig NET_NSH

	tristate "Network Service Header (NSH) protocol"

	default n

	---help---

	  Network Service Header is an implementation of Service Function

	  Chaining (RFC 7665). The current implementation in Linux supports

	  only MD type 1 and only with the openvswitch module.



	  If unsure, say N.

net/nsh/Makefile

0 → 100644
+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_NET_NSH) += nsh.o

net/nsh/nsh.c

0 → 100644
+91 −0
Original line number Diff line number Diff line 
/*

 * Network Service Header

 *

 * Copyright (c) 2017 Red Hat, Inc. -- Jiri Benc <jbenc@redhat.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#include <linux/module.h>

#include <linux/netdevice.h>

#include <linux/skbuff.h>

#include <net/nsh.h>

#include <net/tun_proto.h>



static struct sk_buff *nsh_gso_segment(struct sk_buff *skb,

				       netdev_features_t features)

{

	struct sk_buff *segs = ERR_PTR(-EINVAL);

	unsigned int nsh_len, mac_len;

	__be16 proto;

	int nhoff;



	skb_reset_network_header(skb);



	nhoff = skb->network_header - skb->mac_header;

	mac_len = skb->mac_len;



	if (unlikely(!pskb_may_pull(skb, NSH_BASE_HDR_LEN)))

		goto out;

	nsh_len = nsh_hdr_len(nsh_hdr(skb));

	if (unlikely(!pskb_may_pull(skb, nsh_len)))

		goto out;



	proto = tun_p_to_eth_p(nsh_hdr(skb)->np);

	if (!proto)

		goto out;



	__skb_pull(skb, nsh_len);



	skb_reset_mac_header(skb);

	skb_reset_mac_len(skb);

	skb->protocol = proto;



	features &= NETIF_F_SG;

	segs = skb_mac_gso_segment(skb, features);

	if (IS_ERR_OR_NULL(segs)) {

		skb_gso_error_unwind(skb, htons(ETH_P_NSH), nsh_len,

				     skb->network_header - nhoff,

				     mac_len);

		goto out;

	}



	for (skb = segs; skb; skb = skb->next) {

		skb->protocol = htons(ETH_P_NSH);

		__skb_push(skb, nsh_len);

		skb_set_mac_header(skb, -nhoff);

		skb->network_header = skb->mac_header + mac_len;

		skb->mac_len = mac_len;

	}



out:

	return segs;

}



static struct packet_offload nsh_packet_offload __read_mostly = {

	.type = htons(ETH_P_NSH),

	.priority = 15,

	.callbacks = {

		.gso_segment = nsh_gso_segment,

	},

};



static int __init nsh_init_module(void)

{

	dev_add_offload(&nsh_packet_offload);

	return 0;

}



static void __exit nsh_cleanup_module(void)

{

	dev_remove_offload(&nsh_packet_offload);

}



module_init(nsh_init_module);

module_exit(nsh_cleanup_module);



MODULE_AUTHOR("Jiri Benc <jbenc@redhat.com>");

MODULE_DESCRIPTION("NSH protocol");

MODULE_LICENSE("GPL v2");