2874c5fd28
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* MPLS GSO Support
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*
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* Authors: Simon Horman (horms@verge.net.au)
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*
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* Based on: GSO portions of net/ipv4/gre.c
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/netdev_features.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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static struct sk_buff *mpls_gso_segment(struct sk_buff *skb,
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netdev_features_t features)
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{
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struct sk_buff *segs = ERR_PTR(-EINVAL);
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u16 mac_offset = skb->mac_header;
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netdev_features_t mpls_features;
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u16 mac_len = skb->mac_len;
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__be16 mpls_protocol;
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unsigned int mpls_hlen;
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skb_reset_network_header(skb);
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mpls_hlen = skb_inner_network_header(skb) - skb_network_header(skb);
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if (unlikely(!pskb_may_pull(skb, mpls_hlen)))
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goto out;
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/* Setup inner SKB. */
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mpls_protocol = skb->protocol;
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skb->protocol = skb->inner_protocol;
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__skb_pull(skb, mpls_hlen);
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skb->mac_len = 0;
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skb_reset_mac_header(skb);
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/* Segment inner packet. */
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mpls_features = skb->dev->mpls_features & features;
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segs = skb_mac_gso_segment(skb, mpls_features);
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if (IS_ERR_OR_NULL(segs)) {
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skb_gso_error_unwind(skb, mpls_protocol, mpls_hlen, mac_offset,
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mac_len);
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goto out;
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}
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skb = segs;
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mpls_hlen += mac_len;
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do {
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skb->mac_len = mac_len;
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skb->protocol = mpls_protocol;
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skb_reset_inner_network_header(skb);
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__skb_push(skb, mpls_hlen);
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skb_reset_mac_header(skb);
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skb_set_network_header(skb, mac_len);
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} while ((skb = skb->next));
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out:
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return segs;
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}
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static struct packet_offload mpls_mc_offload __read_mostly = {
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.type = cpu_to_be16(ETH_P_MPLS_MC),
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.priority = 15,
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.callbacks = {
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.gso_segment = mpls_gso_segment,
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},
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};
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static struct packet_offload mpls_uc_offload __read_mostly = {
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.type = cpu_to_be16(ETH_P_MPLS_UC),
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.priority = 15,
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.callbacks = {
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.gso_segment = mpls_gso_segment,
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},
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};
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static int __init mpls_gso_init(void)
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{
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pr_info("MPLS GSO support\n");
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dev_add_offload(&mpls_uc_offload);
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dev_add_offload(&mpls_mc_offload);
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return 0;
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}
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static void __exit mpls_gso_exit(void)
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{
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dev_remove_offload(&mpls_uc_offload);
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dev_remove_offload(&mpls_mc_offload);
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}
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module_init(mpls_gso_init);
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module_exit(mpls_gso_exit);
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MODULE_DESCRIPTION("MPLS GSO support");
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MODULE_AUTHOR("Simon Horman (horms@verge.net.au)");
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MODULE_LICENSE("GPL");
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