1/* SPDX-License-Identifier: GPL-2.0 */
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/macsec.h>
8#include <net/dst.h>
9
10enum metadata_type {
11 METADATA_IP_TUNNEL,
12 METADATA_HW_PORT_MUX,
13 METADATA_MACSEC,
14 METADATA_XFRM,
15};
16
17struct hw_port_info {
18 struct net_device *lower_dev;
19 u32 port_id;
20};
21
22struct macsec_info {
23 sci_t sci;
24};
25
26struct xfrm_md_info {
27 u32 if_id;
28 int link;
29 struct dst_entry *dst_orig;
30};
31
32struct metadata_dst {
33 struct dst_entry dst;
34 enum metadata_type type;
35 union {
36 struct ip_tunnel_info tun_info;
37 struct hw_port_info port_info;
38 struct macsec_info macsec_info;
39 struct xfrm_md_info xfrm_info;
40 } u;
41};
42
43static inline struct metadata_dst *skb_metadata_dst(const struct sk_buff *skb)
44{
45 struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb);
46
47 if (md_dst && md_dst->dst.flags & DST_METADATA)
48 return md_dst;
49
50 return NULL;
51}
52
53static inline struct ip_tunnel_info *
54skb_tunnel_info(const struct sk_buff *skb)
55{
56 struct metadata_dst *md_dst = skb_metadata_dst(skb);
57 struct dst_entry *dst;
58
59 if (md_dst && md_dst->type == METADATA_IP_TUNNEL)
60 return &md_dst->u.tun_info;
61
62 dst = skb_dst(skb);
63 if (dst && dst->lwtstate &&
64 (dst->lwtstate->type == LWTUNNEL_ENCAP_IP ||
65 dst->lwtstate->type == LWTUNNEL_ENCAP_IP6))
66 return lwt_tun_info(lwtstate: dst->lwtstate);
67
68 return NULL;
69}
70
71static inline struct xfrm_md_info *lwt_xfrm_info(struct lwtunnel_state *lwt)
72{
73 return (struct xfrm_md_info *)lwt->data;
74}
75
76static inline struct xfrm_md_info *skb_xfrm_md_info(const struct sk_buff *skb)
77{
78 struct metadata_dst *md_dst = skb_metadata_dst(skb);
79 struct dst_entry *dst;
80
81 if (md_dst && md_dst->type == METADATA_XFRM)
82 return &md_dst->u.xfrm_info;
83
84 dst = skb_dst(skb);
85 if (dst && dst->lwtstate &&
86 dst->lwtstate->type == LWTUNNEL_ENCAP_XFRM)
87 return lwt_xfrm_info(lwt: dst->lwtstate);
88
89 return NULL;
90}
91
92static inline bool skb_valid_dst(const struct sk_buff *skb)
93{
94 struct dst_entry *dst = skb_dst(skb);
95
96 return dst && !(dst->flags & DST_METADATA);
97}
98
99static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a,
100 const struct sk_buff *skb_b)
101{
102 const struct metadata_dst *a, *b;
103
104 if (!(skb_a->_skb_refdst | skb_b->_skb_refdst))
105 return 0;
106
107 a = (const struct metadata_dst *) skb_dst(skb: skb_a);
108 b = (const struct metadata_dst *) skb_dst(skb: skb_b);
109
110 if (!a != !b || a->type != b->type)
111 return 1;
112
113 switch (a->type) {
114 case METADATA_HW_PORT_MUX:
115 return memcmp(p: &a->u.port_info, q: &b->u.port_info,
116 size: sizeof(a->u.port_info));
117 case METADATA_IP_TUNNEL:
118 return memcmp(p: &a->u.tun_info, q: &b->u.tun_info,
119 size: sizeof(a->u.tun_info) +
120 a->u.tun_info.options_len);
121 case METADATA_MACSEC:
122 return memcmp(p: &a->u.macsec_info, q: &b->u.macsec_info,
123 size: sizeof(a->u.macsec_info));
124 case METADATA_XFRM:
125 return memcmp(p: &a->u.xfrm_info, q: &b->u.xfrm_info,
126 size: sizeof(a->u.xfrm_info));
127 default:
128 return 1;
129 }
130}
131
132void metadata_dst_free(struct metadata_dst *);
133struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type,
134 gfp_t flags);
135void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst);
136struct metadata_dst __percpu *
137metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags);
138
139static inline struct metadata_dst *tun_rx_dst(int md_size)
140{
141 struct metadata_dst *tun_dst;
142
143 tun_dst = metadata_dst_alloc(optslen: md_size, type: METADATA_IP_TUNNEL, GFP_ATOMIC);
144 if (!tun_dst)
145 return NULL;
146
147 tun_dst->u.tun_info.options_len = 0;
148 tun_dst->u.tun_info.mode = 0;
149 return tun_dst;
150}
151
152static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb)
153{
154 struct metadata_dst *md_dst = skb_metadata_dst(skb);
155 int md_size;
156 struct metadata_dst *new_md;
157
158 if (!md_dst || md_dst->type != METADATA_IP_TUNNEL)
159 return ERR_PTR(error: -EINVAL);
160
161 md_size = md_dst->u.tun_info.options_len;
162 new_md = metadata_dst_alloc(optslen: md_size, type: METADATA_IP_TUNNEL, GFP_ATOMIC);
163 if (!new_md)
164 return ERR_PTR(error: -ENOMEM);
165
166 memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
167 sizeof(struct ip_tunnel_info) + md_size);
168#ifdef CONFIG_DST_CACHE
169 /* Unclone the dst cache if there is one */
170 if (new_md->u.tun_info.dst_cache.cache) {
171 int ret;
172
173 ret = dst_cache_init(dst_cache: &new_md->u.tun_info.dst_cache, GFP_ATOMIC);
174 if (ret) {
175 metadata_dst_free(new_md);
176 return ERR_PTR(error: ret);
177 }
178 }
179#endif
180
181 skb_dst_drop(skb);
182 skb_dst_set(skb, dst: &new_md->dst);
183 return new_md;
184}
185
186static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb)
187{
188 struct metadata_dst *dst;
189
190 dst = tun_dst_unclone(skb);
191 if (IS_ERR(ptr: dst))
192 return NULL;
193
194 return &dst->u.tun_info;
195}
196
197static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr,
198 __be32 daddr,
199 __u8 tos, __u8 ttl,
200 __be16 tp_dst,
201 __be16 flags,
202 __be64 tunnel_id,
203 int md_size)
204{
205 struct metadata_dst *tun_dst;
206
207 tun_dst = tun_rx_dst(md_size);
208 if (!tun_dst)
209 return NULL;
210
211 ip_tunnel_key_init(key: &tun_dst->u.tun_info.key,
212 saddr, daddr, tos, ttl,
213 label: 0, tp_src: 0, tp_dst, tun_id: tunnel_id, tun_flags: flags);
214 return tun_dst;
215}
216
217static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb,
218 __be16 flags,
219 __be64 tunnel_id,
220 int md_size)
221{
222 const struct iphdr *iph = ip_hdr(skb);
223
224 return __ip_tun_set_dst(saddr: iph->saddr, daddr: iph->daddr, tos: iph->tos, ttl: iph->ttl,
225 tp_dst: 0, flags, tunnel_id, md_size);
226}
227
228static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr,
229 const struct in6_addr *daddr,
230 __u8 tos, __u8 ttl,
231 __be16 tp_dst,
232 __be32 label,
233 __be16 flags,
234 __be64 tunnel_id,
235 int md_size)
236{
237 struct metadata_dst *tun_dst;
238 struct ip_tunnel_info *info;
239
240 tun_dst = tun_rx_dst(md_size);
241 if (!tun_dst)
242 return NULL;
243
244 info = &tun_dst->u.tun_info;
245 info->mode = IP_TUNNEL_INFO_IPV6;
246 info->key.tun_flags = flags;
247 info->key.tun_id = tunnel_id;
248 info->key.tp_src = 0;
249 info->key.tp_dst = tp_dst;
250
251 info->key.u.ipv6.src = *saddr;
252 info->key.u.ipv6.dst = *daddr;
253
254 info->key.tos = tos;
255 info->key.ttl = ttl;
256 info->key.label = label;
257
258 return tun_dst;
259}
260
261static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb,
262 __be16 flags,
263 __be64 tunnel_id,
264 int md_size)
265{
266 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
267
268 return __ipv6_tun_set_dst(saddr: &ip6h->saddr, daddr: &ip6h->daddr,
269 tos: ipv6_get_dsfield(ipv6h: ip6h), ttl: ip6h->hop_limit,
270 tp_dst: 0, label: ip6_flowlabel(hdr: ip6h), flags, tunnel_id,
271 md_size);
272}
273#endif /* __NET_DST_METADATA_H */
274

source code of linux/include/net/dst_metadata.h