cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mpls_gso.c (2434B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *	MPLS GSO Support
      4 *
      5 *	Authors: Simon Horman (horms@verge.net.au)
      6 *
      7 *	Based on: GSO portions of net/ipv4/gre.c
      8 */
      9
     10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
     11
     12#include <linux/err.h>
     13#include <linux/module.h>
     14#include <linux/netdev_features.h>
     15#include <linux/netdevice.h>
     16#include <linux/skbuff.h>
     17#include <net/mpls.h>
     18
     19static struct sk_buff *mpls_gso_segment(struct sk_buff *skb,
     20				       netdev_features_t features)
     21{
     22	struct sk_buff *segs = ERR_PTR(-EINVAL);
     23	u16 mac_offset = skb->mac_header;
     24	netdev_features_t mpls_features;
     25	u16 mac_len = skb->mac_len;
     26	__be16 mpls_protocol;
     27	unsigned int mpls_hlen;
     28
     29	skb_reset_network_header(skb);
     30	mpls_hlen = skb_inner_network_header(skb) - skb_network_header(skb);
     31	if (unlikely(!mpls_hlen || mpls_hlen % MPLS_HLEN))
     32		goto out;
     33	if (unlikely(!pskb_may_pull(skb, mpls_hlen)))
     34		goto out;
     35
     36	/* Setup inner SKB. */
     37	mpls_protocol = skb->protocol;
     38	skb->protocol = skb->inner_protocol;
     39
     40	__skb_pull(skb, mpls_hlen);
     41
     42	skb->mac_len = 0;
     43	skb_reset_mac_header(skb);
     44
     45	/* Segment inner packet. */
     46	mpls_features = skb->dev->mpls_features & features;
     47	segs = skb_mac_gso_segment(skb, mpls_features);
     48	if (IS_ERR_OR_NULL(segs)) {
     49		skb_gso_error_unwind(skb, mpls_protocol, mpls_hlen, mac_offset,
     50				     mac_len);
     51		goto out;
     52	}
     53	skb = segs;
     54
     55	mpls_hlen += mac_len;
     56	do {
     57		skb->mac_len = mac_len;
     58		skb->protocol = mpls_protocol;
     59
     60		skb_reset_inner_network_header(skb);
     61
     62		__skb_push(skb, mpls_hlen);
     63
     64		skb_reset_mac_header(skb);
     65		skb_set_network_header(skb, mac_len);
     66	} while ((skb = skb->next));
     67
     68out:
     69	return segs;
     70}
     71
     72static struct packet_offload mpls_mc_offload __read_mostly = {
     73	.type = cpu_to_be16(ETH_P_MPLS_MC),
     74	.priority = 15,
     75	.callbacks = {
     76		.gso_segment    =	mpls_gso_segment,
     77	},
     78};
     79
     80static struct packet_offload mpls_uc_offload __read_mostly = {
     81	.type = cpu_to_be16(ETH_P_MPLS_UC),
     82	.priority = 15,
     83	.callbacks = {
     84		.gso_segment    =	mpls_gso_segment,
     85	},
     86};
     87
     88static int __init mpls_gso_init(void)
     89{
     90	pr_info("MPLS GSO support\n");
     91
     92	dev_add_offload(&mpls_uc_offload);
     93	dev_add_offload(&mpls_mc_offload);
     94
     95	return 0;
     96}
     97
     98static void __exit mpls_gso_exit(void)
     99{
    100	dev_remove_offload(&mpls_uc_offload);
    101	dev_remove_offload(&mpls_mc_offload);
    102}
    103
    104module_init(mpls_gso_init);
    105module_exit(mpls_gso_exit);
    106
    107MODULE_DESCRIPTION("MPLS GSO support");
    108MODULE_AUTHOR("Simon Horman (horms@verge.net.au)");
    109MODULE_LICENSE("GPL");