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Release 4.11 net/mpls/mpls_gso.c

Directory: net/mpls
/*
 *      MPLS GSO Support
 *
 *      Authors: Simon Horman (horms@verge.net.au)
 *
 *      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.
 *
 *      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>


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; skb_reset_network_header(skb); mpls_hlen = skb_inner_network_header(skb) - skb_network_header(skb); 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; }

Contributors

PersonTokensPropCommitsCommitProp
David Ahern13258.67%133.33%
Simon Horman9240.89%133.33%
Florian Westphal10.44%133.33%
Total225100.00%3100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Simon Horman29100.00%1100.00%
Total29100.00%1100.00%


static void __exit mpls_gso_exit(void) { dev_remove_offload(&mpls_uc_offload); dev_remove_offload(&mpls_mc_offload); }

Contributors

PersonTokensPropCommitsCommitProp
Simon Horman21100.00%1100.00%
Total21100.00%1100.00%

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");

Overall Contributors

PersonTokensPropCommitsCommitProp
Simon Horman24062.34%120.00%
David Ahern13234.29%120.00%
David S. Miller102.60%120.00%
Daniel Borkmann20.52%120.00%
Florian Westphal10.26%120.00%
Total385100.00%5100.00%
Directory: net/mpls
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