From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- net/mpls/mpls_gso.c | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 98 insertions(+) create mode 100644 net/mpls/mpls_gso.c (limited to 'net/mpls/mpls_gso.c') diff --git a/net/mpls/mpls_gso.c b/net/mpls/mpls_gso.c new file mode 100644 index 000000000..809df534a --- /dev/null +++ b/net/mpls/mpls_gso.c @@ -0,0 +1,98 @@ +/* + * 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 +#include +#include +#include +#include + +static struct sk_buff *mpls_gso_segment(struct sk_buff *skb, + netdev_features_t features) +{ + struct sk_buff *segs = ERR_PTR(-EINVAL); + netdev_features_t mpls_features; + __be16 mpls_protocol; + + if (unlikely(skb_shinfo(skb)->gso_type & + ~(SKB_GSO_TCPV4 | + SKB_GSO_TCPV6 | + SKB_GSO_UDP | + SKB_GSO_DODGY | + SKB_GSO_TCP_ECN))) + goto out; + + /* Setup inner SKB. */ + mpls_protocol = skb->protocol; + skb->protocol = skb->inner_protocol; + + /* Push back the mac header that skb_mac_gso_segment() has pulled. + * It will be re-pulled by the call to skb_mac_gso_segment() below + */ + __skb_push(skb, skb->mac_len); + + /* Segment inner packet. */ + mpls_features = skb->dev->mpls_features & features; + segs = skb_mac_gso_segment(skb, mpls_features); + + + /* Restore outer protocol. */ + skb->protocol = mpls_protocol; + + /* Re-pull the mac header that the call to skb_mac_gso_segment() + * above pulled. It will be re-pushed after returning + * skb_mac_gso_segment(), an indirect caller of this function. + */ + __skb_pull(skb, skb->data - skb_mac_header(skb)); +out: + return segs; +} + +static struct packet_offload mpls_mc_offload __read_mostly = { + .type = cpu_to_be16(ETH_P_MPLS_MC), + .callbacks = { + .gso_segment = mpls_gso_segment, + }, +}; + +static struct packet_offload mpls_uc_offload __read_mostly = { + .type = cpu_to_be16(ETH_P_MPLS_UC), + .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"); -- cgit v1.2.3-54-g00ecf