summaryrefslogtreecommitdiff
path: root/include/net/dst_metadata.h
blob: 4160731dcb6e3a55401ef760122ed3b266d308aa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
/* 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/macsec.h>
#include <net/dst.h>

enum metadata_type {
	METADATA_IP_TUNNEL,
	METADATA_HW_PORT_MUX,
	METADATA_MACSEC,
	METADATA_XFRM,
};

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

struct macsec_info {
	sci_t sci;
};

struct xfrm_md_info {
	u32 if_id;
	int link;
	struct dst_entry *dst_orig;
};

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

static inline struct metadata_dst *skb_metadata_dst(const 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(const 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 &&
	    (dst->lwtstate->type == LWTUNNEL_ENCAP_IP ||
	     dst->lwtstate->type == LWTUNNEL_ENCAP_IP6))
		return lwt_tun_info(dst->lwtstate);

	return NULL;
}

static inline struct xfrm_md_info *lwt_xfrm_info(struct lwtunnel_state *lwt)
{
	return (struct xfrm_md_info *)lwt->data;
}

static inline struct xfrm_md_info *skb_xfrm_md_info(const struct sk_buff *skb)
{
	struct metadata_dst *md_dst = skb_metadata_dst(skb);
	struct dst_entry *dst;

	if (md_dst && md_dst->type == METADATA_XFRM)
		return &md_dst->u.xfrm_info;

	dst = skb_dst(skb);
	if (dst && dst->lwtstate &&
	    dst->lwtstate->type == LWTUNNEL_ENCAP_XFRM)
		return lwt_xfrm_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);
	case METADATA_MACSEC:
		return memcmp(&a->u.macsec_info, &b->u.macsec_info,
			      sizeof(a->u.macsec_info));
	case METADATA_XFRM:
		return memcmp(&a->u.xfrm_info, &b->u.xfrm_info,
			      sizeof(a->u.xfrm_info));
	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);
void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst);
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);
#ifdef CONFIG_DST_CACHE
	/* Unclone the dst cache if there is one */
	if (new_md->u.tun_info.dst_cache.cache) {
		int ret;

		ret = dst_cache_init(&new_md->u.tun_info.dst_cache, GFP_ATOMIC);
		if (ret) {
			metadata_dst_free(new_md);
			return ERR_PTR(ret);
		}
	}
#endif

	skb_dst_drop(skb);
	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,
						    const unsigned long *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,
						 const unsigned long *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,
						      const unsigned long *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;
	ip_tunnel_flags_copy(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,
						   const unsigned long *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 */