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nsh: add GSO support

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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: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Benc 2017-08-28 21:43:24 +02:00 committed by David S. Miller
parent 1f0b7744c5
commit c411ed8545
5 changed files with 103 additions and 0 deletions
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1
net/Kconfig
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@ -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"

1
net/Makefile
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@ -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/

9
net/nsh/Kconfig Normal file
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@ -0,0 +1,9 @@
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.

1
net/nsh/Makefile Normal file
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@ -0,0 +1 @@
obj-$(CONFIG_NET_NSH) += nsh.o

91
net/nsh/nsh.c Normal file
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@ -0,0 +1,91 @@
/*
* 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");