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109 lines
2.4 KiB
109 lines
2.4 KiB
// 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 ([email protected]) |
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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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#include <net/mpls.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(!mpls_hlen || mpls_hlen % MPLS_HLEN)) |
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goto out; |
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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 ([email protected])"); |
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MODULE_LICENSE("GPL");
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