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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* MPLS GSO Support
*
* Authors: Simon Horman (horms@verge.net.au)
*
* Based on: GSO portions of net/ipv4/gre.c
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/err.h>
#include <linux/module.h>
#include <linux/netdev_features.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/gso.h>
#include <net/mpls.h>
static struct sk_buff *mpls_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
struct sk_buff *segs = ERR_PTR(-EINVAL);
u16 mac_offset = skb->mac_header;
netdev_features_t mpls_features;
u16 mac_len = skb->mac_len;
__be16 mpls_protocol;
unsigned int mpls_hlen;
if (!skb_inner_network_header_was_set(skb))
goto out;
skb_reset_network_header(skb);
mpls_hlen = skb_inner_network_header(skb) - skb_network_header(skb);
if (unlikely(!mpls_hlen || mpls_hlen % MPLS_HLEN))
goto out;
if (unlikely(!pskb_may_pull(skb, mpls_hlen)))
goto out;
/* Setup inner SKB. */
mpls_protocol = skb->protocol;
skb->protocol = skb->inner_protocol;
__skb_pull(skb, mpls_hlen);
skb->mac_len = 0;
skb_reset_mac_header(skb);
/* Segment inner packet. */
mpls_features = skb->dev->mpls_features & features;
segs = skb_mac_gso_segment(skb, mpls_features);
if (IS_ERR_OR_NULL(segs)) {
skb_gso_error_unwind(skb, mpls_protocol, mpls_hlen, mac_offset,
mac_len);
goto out;
}
skb = segs;
mpls_hlen += mac_len;
do {
skb->mac_len = mac_len;
skb->protocol = mpls_protocol;
skb_reset_inner_network_header(skb);
__skb_push(skb, mpls_hlen);
skb_reset_mac_header(skb);
skb_set_network_header(skb, mac_len);
} while ((skb = skb->next));
out:
return segs;
}
static struct packet_offload mpls_mc_offload __read_mostly = {
.type = cpu_to_be16(ETH_P_MPLS_MC),
.priority = 15,
.callbacks = {
.gso_segment = mpls_gso_segment,
},
};
static struct packet_offload mpls_uc_offload __read_mostly = {
.type = cpu_to_be16(ETH_P_MPLS_UC),
.priority = 15,
.callbacks = {
.gso_segment = mpls_gso_segment,
},
};
static int __init mpls_gso_init(void)
{
pr_info("MPLS GSO support\n");
dev_add_offload(&mpls_uc_offload);
dev_add_offload(&mpls_mc_offload);
return 0;
}
static void __exit mpls_gso_exit(void)
{
dev_remove_offload(&mpls_uc_offload);
dev_remove_offload(&mpls_mc_offload);
}
module_init(mpls_gso_init);
module_exit(mpls_gso_exit);
MODULE_DESCRIPTION("MPLS GSO support");
MODULE_AUTHOR("Simon Horman (horms@verge.net.au)");
MODULE_LICENSE("GPL");
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