103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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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netdev_features_t mpls_features;
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__be16 mpls_protocol;
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if (unlikely(skb_shinfo(skb)->gso_type &
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~(SKB_GSO_TCPV4 |
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SKB_GSO_TCPV6 |
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SKB_GSO_UDP |
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SKB_GSO_DODGY |
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SKB_GSO_TCP_ECN |
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SKB_GSO_GRE |
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SKB_GSO_GRE_CSUM |
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SKB_GSO_IPIP |
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SKB_GSO_MPLS)))
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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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/* Push back the mac header that skb_mac_gso_segment() has pulled.
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* It will be re-pulled by the call to skb_mac_gso_segment() below
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*/
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__skb_push(skb, skb->mac_len);
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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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/* Restore outer protocol. */
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skb->protocol = mpls_protocol;
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/* Re-pull the mac header that the call to skb_mac_gso_segment()
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* above pulled. It will be re-pushed after returning
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* skb_mac_gso_segment(), an indirect caller of this function.
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*/
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__skb_pull(skb, skb->data - skb_mac_header(skb));
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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 = {
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.type = cpu_to_be16(ETH_P_MPLS_MC),
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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 = {
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.type = cpu_to_be16(ETH_P_MPLS_UC),
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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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