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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");
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
22static 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
69out:
70 return segs;
71}
72
73static 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
81static 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
89static 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
99static void __exit mpls_gso_exit(void)
100{
101 dev_remove_offload(&mpls_uc_offload);
102 dev_remove_offload(&mpls_mc_offload);
103}
104
105module_init(mpls_gso_init);
106module_exit(mpls_gso_exit);
107
108MODULE_DESCRIPTION("MPLS GSO support");
109MODULE_AUTHOR("Simon Horman (horms@verge.net.au)");
110MODULE_LICENSE("GPL");