Merge tag 'ktest-v3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[cascardo/linux.git] / net / mpls / mpls_gso.c
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         netdev_features_t mpls_features;
27         __be16 mpls_protocol;
28
29         if (unlikely(skb_shinfo(skb)->gso_type &
30                                 ~(SKB_GSO_TCPV4 |
31                                   SKB_GSO_TCPV6 |
32                                   SKB_GSO_UDP |
33                                   SKB_GSO_DODGY |
34                                   SKB_GSO_TCP_ECN |
35                                   SKB_GSO_GRE |
36                                   SKB_GSO_GRE_CSUM |
37                                   SKB_GSO_IPIP |
38                                   SKB_GSO_MPLS)))
39                 goto out;
40
41         /* Setup inner SKB. */
42         mpls_protocol = skb->protocol;
43         skb->protocol = skb->inner_protocol;
44
45         /* Push back the mac header that skb_mac_gso_segment() has pulled.
46          * It will be re-pulled by the call to skb_mac_gso_segment() below
47          */
48         __skb_push(skb, skb->mac_len);
49
50         /* Segment inner packet. */
51         mpls_features = skb->dev->mpls_features & netif_skb_features(skb);
52         segs = skb_mac_gso_segment(skb, mpls_features);
53
54
55         /* Restore outer protocol. */
56         skb->protocol = mpls_protocol;
57
58         /* Re-pull the mac header that the call to skb_mac_gso_segment()
59          * above pulled.  It will be re-pushed after returning
60          * skb_mac_gso_segment(), an indirect caller of this function.
61          */
62         __skb_push(skb, skb->data - skb_mac_header(skb));
63
64 out:
65         return segs;
66 }
67
68 static struct packet_offload mpls_mc_offload = {
69         .type = cpu_to_be16(ETH_P_MPLS_MC),
70         .callbacks = {
71                 .gso_segment    =       mpls_gso_segment,
72         },
73 };
74
75 static struct packet_offload mpls_uc_offload = {
76         .type = cpu_to_be16(ETH_P_MPLS_UC),
77         .callbacks = {
78                 .gso_segment    =       mpls_gso_segment,
79         },
80 };
81
82 static int __init mpls_gso_init(void)
83 {
84         pr_info("MPLS GSO support\n");
85
86         dev_add_offload(&mpls_uc_offload);
87         dev_add_offload(&mpls_mc_offload);
88
89         return 0;
90 }
91
92 static void __exit mpls_gso_exit(void)
93 {
94         dev_remove_offload(&mpls_uc_offload);
95         dev_remove_offload(&mpls_mc_offload);
96 }
97
98 module_init(mpls_gso_init);
99 module_exit(mpls_gso_exit);
100
101 MODULE_DESCRIPTION("MPLS GSO support");
102 MODULE_AUTHOR("Simon Horman (horms@verge.net.au)");
103 MODULE_LICENSE("GPL");