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Merge remote-tracking branch 'asoc/fix/dapm' into asoc-linus
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / fou6.c
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1#include <linux/module.h>
2#include <linux/errno.h>
3#include <linux/socket.h>
4#include <linux/skbuff.h>
5#include <linux/ip.h>
6#include <linux/udp.h>
7#include <linux/types.h>
8#include <linux/kernel.h>
9#include <net/fou.h>
10#include <net/ip.h>
11#include <net/ip6_tunnel.h>
12#include <net/ip6_checksum.h>
13#include <net/protocol.h>
14#include <net/udp.h>
15#include <net/udp_tunnel.h>
16
17static void fou6_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e,
18 struct flowi6 *fl6, u8 *protocol, __be16 sport)
19{
20 struct udphdr *uh;
21
22 skb_push(skb, sizeof(struct udphdr));
23 skb_reset_transport_header(skb);
24
25 uh = udp_hdr(skb);
26
27 uh->dest = e->dport;
28 uh->source = sport;
29 uh->len = htons(skb->len);
30 udp6_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM6), skb,
31 &fl6->saddr, &fl6->daddr, skb->len);
32
33 *protocol = IPPROTO_UDP;
34}
35
36int fou6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
37 u8 *protocol, struct flowi6 *fl6)
38{
39 __be16 sport;
40 int err;
41 int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
42 SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
43
44 err = __fou_build_header(skb, e, protocol, &sport, type);
45 if (err)
46 return err;
47
48 fou6_build_udp(skb, e, fl6, protocol, sport);
49
50 return 0;
51}
52EXPORT_SYMBOL(fou6_build_header);
53
54int gue6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
55 u8 *protocol, struct flowi6 *fl6)
56{
57 __be16 sport;
58 int err;
59 int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
60 SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
61
62 err = __gue_build_header(skb, e, protocol, &sport, type);
63 if (err)
64 return err;
65
66 fou6_build_udp(skb, e, fl6, protocol, sport);
67
68 return 0;
69}
70EXPORT_SYMBOL(gue6_build_header);
71
fabb13db 72#if IS_ENABLED(CONFIG_IPV6_FOU_TUNNEL)
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73
74static const struct ip6_tnl_encap_ops fou_ip6tun_ops = {
75 .encap_hlen = fou_encap_hlen,
76 .build_header = fou6_build_header,
77};
78
79static const struct ip6_tnl_encap_ops gue_ip6tun_ops = {
80 .encap_hlen = gue_encap_hlen,
81 .build_header = gue6_build_header,
82};
83
84static int ip6_tnl_encap_add_fou_ops(void)
85{
86 int ret;
87
88 ret = ip6_tnl_encap_add_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
89 if (ret < 0) {
90 pr_err("can't add fou6 ops\n");
91 return ret;
92 }
93
94 ret = ip6_tnl_encap_add_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
95 if (ret < 0) {
96 pr_err("can't add gue6 ops\n");
97 ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
98 return ret;
99 }
100
101 return 0;
102}
103
104static void ip6_tnl_encap_del_fou_ops(void)
105{
106 ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
107 ip6_tnl_encap_del_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
108}
109
110#else
111
112static int ip6_tnl_encap_add_fou_ops(void)
113{
114 return 0;
115}
116
117static void ip6_tnl_encap_del_fou_ops(void)
118{
119}
120
121#endif
122
123static int __init fou6_init(void)
124{
125 int ret;
126
127 ret = ip6_tnl_encap_add_fou_ops();
128
129 return ret;
130}
131
132static void __exit fou6_fini(void)
133{
134 ip6_tnl_encap_del_fou_ops();
135}
136
137module_init(fou6_init);
138module_exit(fou6_fini);
139MODULE_AUTHOR("Tom Herbert <therbert@google.com>");
140MODULE_LICENSE("GPL");