[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / fou6.c

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/socket.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <net/fou.h>
#include <net/ip.h>
#include <net/ip6_tunnel.h>
#include <net/ip6_checksum.h>
#include <net/protocol.h>
#include <net/udp.h>
#include <net/udp_tunnel.h>

#if IS_ENABLED(CONFIG_IPV6_FOU_TUNNEL)

static void fou6_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e,
			   struct flowi6 *fl6, u8 *protocol, __be16 sport)
{
	struct udphdr *uh;

	skb_push(skb, sizeof(struct udphdr));
	skb_reset_transport_header(skb);

	uh = udp_hdr(skb);

	uh->dest = e->dport;
	uh->source = sport;
	uh->len = htons(skb->len);
	udp6_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM6), skb,
		      &fl6->saddr, &fl6->daddr, skb->len);

	*protocol = IPPROTO_UDP;
}

static int fou6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
			     u8 *protocol, struct flowi6 *fl6)
{
	__be16 sport;
	int err;
	int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
		SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;

	err = __fou_build_header(skb, e, protocol, &sport, type);
	if (err)
		return err;

	fou6_build_udp(skb, e, fl6, protocol, sport);

	return 0;
}

static int gue6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
			     u8 *protocol, struct flowi6 *fl6)
{
	__be16 sport;
	int err;
	int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
		SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;

	err = __gue_build_header(skb, e, protocol, &sport, type);
	if (err)
		return err;

	fou6_build_udp(skb, e, fl6, protocol, sport);

	return 0;
}

static const struct ip6_tnl_encap_ops fou_ip6tun_ops = {
	.encap_hlen = fou_encap_hlen,
	.build_header = fou6_build_header,
};

static const struct ip6_tnl_encap_ops gue_ip6tun_ops = {
	.encap_hlen = gue_encap_hlen,
	.build_header = gue6_build_header,
};

static int ip6_tnl_encap_add_fou_ops(void)
{
	int ret;

	ret = ip6_tnl_encap_add_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
	if (ret < 0) {
		pr_err("can't add fou6 ops\n");
		return ret;
	}

	ret = ip6_tnl_encap_add_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
	if (ret < 0) {
		pr_err("can't add gue6 ops\n");
		ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
		return ret;
	}

	return 0;
}

static void ip6_tnl_encap_del_fou_ops(void)
{
	ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
	ip6_tnl_encap_del_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
}

#else

static int ip6_tnl_encap_add_fou_ops(void)
{
	return 0;
}

static void ip6_tnl_encap_del_fou_ops(void)
{
}

#endif

static int __init fou6_init(void)
{
	int ret;

	ret = ip6_tnl_encap_add_fou_ops();

	return ret;
}

static void __exit fou6_fini(void)
{
	ip6_tnl_encap_del_fou_ops();
}

module_init(fou6_init);
module_exit(fou6_fini);
MODULE_AUTHOR("Tom Herbert <therbert@google.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
aa3463d6 TH	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
9dc621af	17	#if IS_ENABLED(CONFIG_IPV6_FOU_TUNNEL)
9dc621af	18
aa3463d6 TH	19	static void fou6_build_udp(struct sk_buff skb, struct ip_tunnel_encap e,
	20	struct flowi6 fl6, u8 protocol, __be16 sport)
	21	{
	22	struct udphdr *uh;
	23
	24	skb_push(skb, sizeof(struct udphdr));
	25	skb_reset_transport_header(skb);
	26
	27	uh = udp_hdr(skb);
	28
	29	uh->dest = e->dport;
	30	uh->source = sport;
	31	uh->len = htons(skb->len);
	32	udp6_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM6), skb,
	33	&fl6->saddr, &fl6->daddr, skb->len);
	34
	35	*protocol = IPPROTO_UDP;
	36	}
	37
9dc621af	38	static int fou6_build_header(struct sk_buff skb, struct ip_tunnel_encap e,
9dc621af	39	u8 protocol, struct flowi6 fl6)
aa3463d6 TH	40	{
	41	__be16 sport;
	42	int err;
	43	int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
	44	SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
	45
	46	err = __fou_build_header(skb, e, protocol, &sport, type);
	47	if (err)
	48	return err;
	49
	50	fou6_build_udp(skb, e, fl6, protocol, sport);
	51
	52	return 0;
	53	}
aa3463d6	54
9dc621af	55	static int gue6_build_header(struct sk_buff skb, struct ip_tunnel_encap e,
9dc621af	56	u8 protocol, struct flowi6 fl6)
aa3463d6 TH	57	{
	58	__be16 sport;
	59	int err;
	60	int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
	61	SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
	62
	63	err = __gue_build_header(skb, e, protocol, &sport, type);
	64	if (err)
	65	return err;
	66
	67	fou6_build_udp(skb, e, fl6, protocol, sport);
	68
	69	return 0;
	70	}
aa3463d6 TH	71
	72	static const struct ip6_tnl_encap_ops fou_ip6tun_ops = {
	73	.encap_hlen = fou_encap_hlen,
	74	.build_header = fou6_build_header,
	75	};
	76
	77	static const struct ip6_tnl_encap_ops gue_ip6tun_ops = {
	78	.encap_hlen = gue_encap_hlen,
	79	.build_header = gue6_build_header,
	80	};
	81
	82	static int ip6_tnl_encap_add_fou_ops(void)
	83	{
	84	int ret;
	85
	86	ret = ip6_tnl_encap_add_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
	87	if (ret < 0) {
	88	pr_err("can't add fou6 ops\n");
	89	return ret;
	90	}
	91
	92	ret = ip6_tnl_encap_add_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
	93	if (ret < 0) {
	94	pr_err("can't add gue6 ops\n");
	95	ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
	96	return ret;
	97	}
	98
	99	return 0;
	100	}
	101
	102	static void ip6_tnl_encap_del_fou_ops(void)
	103	{
	104	ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
	105	ip6_tnl_encap_del_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
	106	}
	107
	108	#else
	109
	110	static int ip6_tnl_encap_add_fou_ops(void)
	111	{
	112	return 0;
	113	}
	114
	115	static void ip6_tnl_encap_del_fou_ops(void)
	116	{
	117	}
	118
	119	#endif
	120
	121	static int __init fou6_init(void)
	122	{
	123	int ret;
	124
	125	ret = ip6_tnl_encap_add_fou_ops();
	126
	127	return ret;
	128	}
	129
	130	static void __exit fou6_fini(void)
	131	{
	132	ip6_tnl_encap_del_fou_ops();
	133	}
	134
135	module_init(fou6_init);
136	module_exit(fou6_fini);
137	MODULE_AUTHOR("Tom Herbert <therbert@google.com>");
138	MODULE_LICENSE("GPL");