[mirror_ubuntu-focal-kernel.git] / include / net / dst_metadata.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_DST_METADATA_H
#define __NET_DST_METADATA_H 1

#include <linux/skbuff.h>
#include <net/ip_tunnels.h>
#include <net/dst.h>

enum metadata_type {
	METADATA_IP_TUNNEL,
	METADATA_HW_PORT_MUX,
};

struct hw_port_info {
	struct net_device *lower_dev;
	u32 port_id;
};

struct metadata_dst {
	struct dst_entry		dst;
	enum metadata_type		type;
	union {
		struct ip_tunnel_info	tun_info;
		struct hw_port_info	port_info;
	} u;
};

static inline struct metadata_dst *skb_metadata_dst(struct sk_buff *skb)
{
	struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb);

	if (md_dst && md_dst->dst.flags & DST_METADATA)
		return md_dst;

	return NULL;
}

static inline struct ip_tunnel_info *skb_tunnel_info(struct sk_buff *skb)
{
	struct metadata_dst *md_dst = skb_metadata_dst(skb);
	struct dst_entry *dst;

	if (md_dst && md_dst->type == METADATA_IP_TUNNEL)
		return &md_dst->u.tun_info;

	dst = skb_dst(skb);
	if (dst && dst->lwtstate)
		return lwt_tun_info(dst->lwtstate);

	return NULL;
}

static inline bool skb_valid_dst(const struct sk_buff *skb)
{
	struct dst_entry *dst = skb_dst(skb);

	return dst && !(dst->flags & DST_METADATA);
}

static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a,
				       const struct sk_buff *skb_b)
{
	const struct metadata_dst *a, *b;

	if (!(skb_a->_skb_refdst | skb_b->_skb_refdst))
		return 0;

	a = (const struct metadata_dst *) skb_dst(skb_a);
	b = (const struct metadata_dst *) skb_dst(skb_b);

	if (!a != !b || a->type != b->type)
		return 1;

	switch (a->type) {
	case METADATA_HW_PORT_MUX:
		return memcmp(&a->u.port_info, &b->u.port_info,
			      sizeof(a->u.port_info));
	case METADATA_IP_TUNNEL:
		return memcmp(&a->u.tun_info, &b->u.tun_info,
			      sizeof(a->u.tun_info) +
					 a->u.tun_info.options_len);
	default:
		return 1;
	}
}

void metadata_dst_free(struct metadata_dst *);
struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type,
					gfp_t flags);
struct metadata_dst __percpu *
metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags);

static inline struct metadata_dst *tun_rx_dst(int md_size)
{
	struct metadata_dst *tun_dst;

	tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
	if (!tun_dst)
		return NULL;

	tun_dst->u.tun_info.options_len = 0;
	tun_dst->u.tun_info.mode = 0;
	return tun_dst;
}

static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb)
{
	struct metadata_dst *md_dst = skb_metadata_dst(skb);
	int md_size;
	struct metadata_dst *new_md;

	if (!md_dst || md_dst->type != METADATA_IP_TUNNEL)
		return ERR_PTR(-EINVAL);

	md_size = md_dst->u.tun_info.options_len;
	new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
	if (!new_md)
		return ERR_PTR(-ENOMEM);

	memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
	       sizeof(struct ip_tunnel_info) + md_size);
	skb_dst_drop(skb);
	dst_hold(&new_md->dst);
	skb_dst_set(skb, &new_md->dst);
	return new_md;
}

static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb)
{
	struct metadata_dst *dst;

	dst = tun_dst_unclone(skb);
	if (IS_ERR(dst))
		return NULL;

	return &dst->u.tun_info;
}

static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr,
						    __be32 daddr,
						    __u8 tos, __u8 ttl,
						    __be16 tp_dst,
						    __be16 flags,
						    __be64 tunnel_id,
						    int md_size)
{
	struct metadata_dst *tun_dst;

	tun_dst = tun_rx_dst(md_size);
	if (!tun_dst)
		return NULL;

	ip_tunnel_key_init(&tun_dst->u.tun_info.key,
			   saddr, daddr, tos, ttl,
			   0, 0, tp_dst, tunnel_id, flags);
	return tun_dst;
}

static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb,
						 __be16 flags,
						 __be64 tunnel_id,
						 int md_size)
{
	const struct iphdr *iph = ip_hdr(skb);

	return __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl,
				0, flags, tunnel_id, md_size);
}

static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr,
						      const struct in6_addr *daddr,
						      __u8 tos, __u8 ttl,
						      __be16 tp_dst,
						      __be32 label,
						      __be16 flags,
						      __be64 tunnel_id,
						      int md_size)
{
	struct metadata_dst *tun_dst;
	struct ip_tunnel_info *info;

	tun_dst = tun_rx_dst(md_size);
	if (!tun_dst)
		return NULL;

	info = &tun_dst->u.tun_info;
	info->mode = IP_TUNNEL_INFO_IPV6;
	info->key.tun_flags = flags;
	info->key.tun_id = tunnel_id;
	info->key.tp_src = 0;
	info->key.tp_dst = tp_dst;

	info->key.u.ipv6.src = *saddr;
	info->key.u.ipv6.dst = *daddr;

	info->key.tos = tos;
	info->key.ttl = ttl;
	info->key.label = label;

	return tun_dst;
}

static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb,
						   __be16 flags,
						   __be64 tunnel_id,
						   int md_size)
{
	const struct ipv6hdr *ip6h = ipv6_hdr(skb);

	return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr,
				  ipv6_get_dsfield(ip6h), ip6h->hop_limit,
				  0, ip6_flowlabel(ip6h), flags, tunnel_id,
				  md_size);
}
#endif /* __NET_DST_METADATA_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
f38a9eb1 TG	2	#ifndef __NET_DST_METADATA_H
	3	#define __NET_DST_METADATA_H 1
	4
	5	#include <linux/skbuff.h>
	6	#include <net/ip_tunnels.h>
	7	#include <net/dst.h>
	8
3fcece12 JK	9	enum metadata_type {
	10	METADATA_IP_TUNNEL,
	11	METADATA_HW_PORT_MUX,
	12	};
	13
	14	struct hw_port_info {
	15	struct net_device *lower_dev;
	16	u32 port_id;
	17	};
	18
f38a9eb1 TG	19	struct metadata_dst {
f38a9eb1 TG	20	struct dst_entry dst;
3fcece12	21	enum metadata_type type;
ee122c79 TG	22	union {
ee122c79 TG	23	struct ip_tunnel_info tun_info;
3fcece12	24	struct hw_port_info port_info;
ee122c79	25	} u;
f38a9eb1 TG	26	};
	27
	28	static inline struct metadata_dst skb_metadata_dst(struct sk_buff skb)
	29	{
	30	struct metadata_dst md_dst = (struct metadata_dst ) skb_dst(skb);
	31
	32	if (md_dst && md_dst->dst.flags & DST_METADATA)
	33	return md_dst;
	34
	35	return NULL;
	36	}
	37
61adedf3	38	static inline struct ip_tunnel_info skb_tunnel_info(struct sk_buff skb)
ee122c79 TG	39	{
ee122c79 TG	40	struct metadata_dst *md_dst = skb_metadata_dst(skb);
61adedf3	41	struct dst_entry *dst;
ee122c79	42
3fcece12	43	if (md_dst && md_dst->type == METADATA_IP_TUNNEL)
ee122c79 TG	44	return &md_dst->u.tun_info;
ee122c79 TG	45
61adedf3 JB	46	dst = skb_dst(skb);
	47	if (dst && dst->lwtstate)
	48	return lwt_tun_info(dst->lwtstate);
3093fbe7	49
ee122c79 TG	50	return NULL;
	51	}
	52
f38a9eb1 TG	53	static inline bool skb_valid_dst(const struct sk_buff *skb)
	54	{
	55	struct dst_entry *dst = skb_dst(skb);
	56
	57	return dst && !(dst->flags & DST_METADATA);
	58	}
	59
ce87fc6c JG	60	static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a,
	61	const struct sk_buff *skb_b)
	62	{
	63	const struct metadata_dst a, b;
	64
	65	if (!(skb_a->_skb_refdst \| skb_b->_skb_refdst))
	66	return 0;
	67
	68	a = (const struct metadata_dst *) skb_dst(skb_a);
	69	b = (const struct metadata_dst *) skb_dst(skb_b);
	70
3fcece12	71	if (!a != !b \|\| a->type != b->type)
ce87fc6c JG	72	return 1;
ce87fc6c JG	73
3fcece12 JK	74	switch (a->type) {
	75	case METADATA_HW_PORT_MUX:
	76	return memcmp(&a->u.port_info, &b->u.port_info,
	77	sizeof(a->u.port_info));
	78	case METADATA_IP_TUNNEL:
	79	return memcmp(&a->u.tun_info, &b->u.tun_info,
	80	sizeof(a->u.tun_info) +
	81	a->u.tun_info.options_len);
	82	default:
	83	return 1;
	84	}
ce87fc6c JG	85	}
ce87fc6c JG	86
d71785ff	87	void metadata_dst_free(struct metadata_dst *);
3fcece12 JK	88	struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type,
	89	gfp_t flags);
	90	struct metadata_dst __percpu *
	91	metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags);
f38a9eb1	92
4c222798	93	static inline struct metadata_dst *tun_rx_dst(int md_size)
c29a70d2 PS	94	{
c29a70d2 PS	95	struct metadata_dst *tun_dst;
c29a70d2	96
3fcece12	97	tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
c29a70d2 PS	98	if (!tun_dst)
	99	return NULL;
	100
4c222798 PS	101	tun_dst->u.tun_info.options_len = 0;
4c222798 PS	102	tun_dst->u.tun_info.mode = 0;
c29a70d2 PS	103	return tun_dst;
	104	}
	105
fc4099f1 PS	106	static inline struct metadata_dst tun_dst_unclone(struct sk_buff skb)
	107	{
	108	struct metadata_dst *md_dst = skb_metadata_dst(skb);
f63ce5b6	109	int md_size;
fc4099f1 PS	110	struct metadata_dst *new_md;
fc4099f1 PS	111
3fcece12	112	if (!md_dst \|\| md_dst->type != METADATA_IP_TUNNEL)
fc4099f1 PS	113	return ERR_PTR(-EINVAL);
fc4099f1 PS	114
f63ce5b6	115	md_size = md_dst->u.tun_info.options_len;
3fcece12	116	new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
fc4099f1 PS	117	if (!new_md)
	118	return ERR_PTR(-ENOMEM);
	119
	120	memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
	121	sizeof(struct ip_tunnel_info) + md_size);
	122	skb_dst_drop(skb);
	123	dst_hold(&new_md->dst);
	124	skb_dst_set(skb, &new_md->dst);
	125	return new_md;
	126	}
	127
	128	static inline struct ip_tunnel_info skb_tunnel_info_unclone(struct sk_buff skb)
	129	{
	130	struct metadata_dst *dst;
	131
	132	dst = tun_dst_unclone(skb);
	133	if (IS_ERR(dst))
	134	return NULL;
	135
	136	return &dst->u.tun_info;
	137	}
	138
2ff378b7 AV	139	static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr,
	140	__be32 daddr,
	141	__u8 tos, __u8 ttl,
24ba898d	142	__be16 tp_dst,
2ff378b7 AV	143	__be16 flags,
	144	__be64 tunnel_id,
	145	int md_size)
c29a70d2	146	{
c29a70d2	147	struct metadata_dst *tun_dst;
c29a70d2	148
4c222798	149	tun_dst = tun_rx_dst(md_size);
c29a70d2 PS	150	if (!tun_dst)
	151	return NULL;
	152
4c222798	153	ip_tunnel_key_init(&tun_dst->u.tun_info.key,
2ff378b7	154	saddr, daddr, tos, ttl,
24ba898d	155	0, 0, tp_dst, tunnel_id, flags);
c29a70d2 PS	156	return tun_dst;
	157	}
	158
2ff378b7	159	static inline struct metadata_dst ip_tun_rx_dst(struct sk_buff skb,
c29a70d2 PS	160	__be16 flags,
	161	__be64 tunnel_id,
	162	int md_size)
	163	{
2ff378b7 AV	164	const struct iphdr *iph = ip_hdr(skb);
	165
	166	return __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl,
24ba898d	167	0, flags, tunnel_id, md_size);
2ff378b7 AV	168	}
	169
	170	static inline struct metadata_dst __ipv6_tun_set_dst(const struct in6_addr saddr,
	171	const struct in6_addr *daddr,
	172	__u8 tos, __u8 ttl,
24ba898d	173	__be16 tp_dst,
2ff378b7 AV	174	__be32 label,
	175	__be16 flags,
	176	__be64 tunnel_id,
	177	int md_size)
	178	{
c29a70d2 PS	179	struct metadata_dst *tun_dst;
	180	struct ip_tunnel_info *info;
	181
4c222798	182	tun_dst = tun_rx_dst(md_size);
c29a70d2 PS	183	if (!tun_dst)
	184	return NULL;
	185
	186	info = &tun_dst->u.tun_info;
4c222798 PS	187	info->mode = IP_TUNNEL_INFO_IPV6;
	188	info->key.tun_flags = flags;
	189	info->key.tun_id = tunnel_id;
	190	info->key.tp_src = 0;
24ba898d	191	info->key.tp_dst = tp_dst;
4c222798	192
2ff378b7 AV	193	info->key.u.ipv6.src = *saddr;
2ff378b7 AV	194	info->key.u.ipv6.dst = *daddr;
13461144	195
2ff378b7 AV	196	info->key.tos = tos;
	197	info->key.ttl = ttl;
	198	info->key.label = label;
13461144	199
c29a70d2 PS	200	return tun_dst;
	201	}
	202
2ff378b7 AV	203	static inline struct metadata_dst ipv6_tun_rx_dst(struct sk_buff skb,
	204	__be16 flags,
	205	__be64 tunnel_id,
	206	int md_size)
	207	{
	208	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
	209
	210	return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr,
	211	ipv6_get_dsfield(ip6h), ip6h->hop_limit,
24ba898d	212	0, ip6_flowlabel(ip6h), flags, tunnel_id,
2ff378b7 AV	213	md_size);
2ff378b7 AV	214	}
f38a9eb1	215	#endif /* __NET_DST_METADATA_H */