nsh.c (91de76e661a266731fc2889a398ad1694df9d523) nsh.c (b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3)
1/*
2 * Network Service Header
3 *
4 * Copyright (c) 2017 Red Hat, Inc. -- Jiri Benc <jbenc@redhat.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/module.h>
12#include <linux/netdevice.h>
13#include <linux/skbuff.h>
14#include <net/nsh.h>
15#include <net/tun_proto.h>
16
1/*
2 * Network Service Header
3 *
4 * Copyright (c) 2017 Red Hat, Inc. -- Jiri Benc <jbenc@redhat.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/module.h>
12#include <linux/netdevice.h>
13#include <linux/skbuff.h>
14#include <net/nsh.h>
15#include <net/tun_proto.h>
16
17int nsh_push(struct sk_buff *skb, const struct nshhdr *pushed_nh)
18{
19 struct nshhdr *nh;
20 size_t length = nsh_hdr_len(pushed_nh);
21 u8 next_proto;
22
23 if (skb->mac_len) {
24 next_proto = TUN_P_ETHERNET;
25 } else {
26 next_proto = tun_p_from_eth_p(skb->protocol);
27 if (!next_proto)
28 return -EAFNOSUPPORT;
29 }
30
31 /* Add the NSH header */
32 if (skb_cow_head(skb, length) < 0)
33 return -ENOMEM;
34
35 skb_push(skb, length);
36 nh = (struct nshhdr *)(skb->data);
37 memcpy(nh, pushed_nh, length);
38 nh->np = next_proto;
39 skb_postpush_rcsum(skb, nh, length);
40
41 skb->protocol = htons(ETH_P_NSH);
42 skb_reset_mac_header(skb);
43 skb_reset_network_header(skb);
44 skb_reset_mac_len(skb);
45
46 return 0;
47}
48EXPORT_SYMBOL_GPL(nsh_push);
49
50int nsh_pop(struct sk_buff *skb)
51{
52 struct nshhdr *nh;
53 size_t length;
54 __be16 inner_proto;
55
56 if (!pskb_may_pull(skb, NSH_BASE_HDR_LEN))
57 return -ENOMEM;
58 nh = (struct nshhdr *)(skb->data);
59 length = nsh_hdr_len(nh);
60 inner_proto = tun_p_to_eth_p(nh->np);
61 if (!pskb_may_pull(skb, length))
62 return -ENOMEM;
63
64 if (!inner_proto)
65 return -EAFNOSUPPORT;
66
67 skb_pull_rcsum(skb, length);
68 skb_reset_mac_header(skb);
69 skb_reset_network_header(skb);
70 skb_reset_mac_len(skb);
71 skb->protocol = inner_proto;
72
73 return 0;
74}
75EXPORT_SYMBOL_GPL(nsh_pop);
76
17static struct sk_buff *nsh_gso_segment(struct sk_buff *skb,
18 netdev_features_t features)
19{
20 struct sk_buff *segs = ERR_PTR(-EINVAL);
21 unsigned int nsh_len, mac_len;
22 __be16 proto;
23 int nhoff;
24

--- 67 unchanged lines hidden --- 		77static struct sk_buff *nsh_gso_segment(struct sk_buff *skb,
78 netdev_features_t features)
79{
80 struct sk_buff *segs = ERR_PTR(-EINVAL);
81 unsigned int nsh_len, mac_len;
82 __be16 proto;
83 int nhoff;
84

--- 67 unchanged lines hidden ---