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Linux/net/mpls/mpls_gso.c

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  1 /*
  2  *      MPLS GSO Support
  3  *
  4  *      Authors: Simon Horman (horms@verge.net.au)
  5  *
  6  *      This program is free software; you can redistribute it and/or
  7  *      modify it under the terms of the GNU General Public License
  8  *      as published by the Free Software Foundation; either version
  9  *      2 of the License, or (at your option) any later version.
 10  *
 11  *      Based on: GSO portions of net/ipv4/gre.c
 12  */
 13 
 14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 15 
 16 #include <linux/err.h>
 17 #include <linux/module.h>
 18 #include <linux/netdev_features.h>
 19 #include <linux/netdevice.h>
 20 #include <linux/skbuff.h>
 21 
 22 static struct sk_buff *mpls_gso_segment(struct sk_buff *skb,
 23                                        netdev_features_t features)
 24 {
 25         struct sk_buff *segs = ERR_PTR(-EINVAL);
 26         u16 mac_offset = skb->mac_header;
 27         netdev_features_t mpls_features;
 28         u16 mac_len = skb->mac_len;
 29         __be16 mpls_protocol;
 30         unsigned int mpls_hlen;
 31 
 32         skb_reset_network_header(skb);
 33         mpls_hlen = skb_inner_network_header(skb) - skb_network_header(skb);
 34         if (unlikely(!pskb_may_pull(skb, mpls_hlen)))
 35                 goto out;
 36 
 37         /* Setup inner SKB. */
 38         mpls_protocol = skb->protocol;
 39         skb->protocol = skb->inner_protocol;
 40 
 41         __skb_pull(skb, mpls_hlen);
 42 
 43         skb->mac_len = 0;
 44         skb_reset_mac_header(skb);
 45 
 46         /* Segment inner packet. */
 47         mpls_features = skb->dev->mpls_features & features;
 48         segs = skb_mac_gso_segment(skb, mpls_features);
 49         if (IS_ERR_OR_NULL(segs)) {
 50                 skb_gso_error_unwind(skb, mpls_protocol, mpls_hlen, mac_offset,
 51                                      mac_len);
 52                 goto out;
 53         }
 54         skb = segs;
 55 
 56         mpls_hlen += mac_len;
 57         do {
 58                 skb->mac_len = mac_len;
 59                 skb->protocol = mpls_protocol;
 60 
 61                 skb_reset_inner_network_header(skb);
 62 
 63                 __skb_push(skb, mpls_hlen);
 64 
 65                 skb_reset_mac_header(skb);
 66                 skb_set_network_header(skb, mac_len);
 67         } while ((skb = skb->next));
 68 
 69 out:
 70         return segs;
 71 }
 72 
 73 static struct packet_offload mpls_mc_offload __read_mostly = {
 74         .type = cpu_to_be16(ETH_P_MPLS_MC),
 75         .priority = 15,
 76         .callbacks = {
 77                 .gso_segment    =       mpls_gso_segment,
 78         },
 79 };
 80 
 81 static struct packet_offload mpls_uc_offload __read_mostly = {
 82         .type = cpu_to_be16(ETH_P_MPLS_UC),
 83         .priority = 15,
 84         .callbacks = {
 85                 .gso_segment    =       mpls_gso_segment,
 86         },
 87 };
 88 
 89 static int __init mpls_gso_init(void)
 90 {
 91         pr_info("MPLS GSO support\n");
 92 
 93         dev_add_offload(&mpls_uc_offload);
 94         dev_add_offload(&mpls_mc_offload);
 95 
 96         return 0;
 97 }
 98 
 99 static void __exit mpls_gso_exit(void)
100 {
101         dev_remove_offload(&mpls_uc_offload);
102         dev_remove_offload(&mpls_mc_offload);
103 }
104 
105 module_init(mpls_gso_init);
106 module_exit(mpls_gso_exit);
107 
108 MODULE_DESCRIPTION("MPLS GSO support");
109 MODULE_AUTHOR("Simon Horman (horms@verge.net.au)");
110 MODULE_LICENSE("GPL");
111 

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