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/dst.h>
8
9enum metadata_type {
10 METADATA_IP_TUNNEL,
11 METADATA_HW_PORT_MUX,
12};
13
14struct hw_port_info {
15 struct net_device *lower_dev;
16 u32 port_id;
17};
18
19struct metadata_dst {
20 struct dst_entry dst;
21 enum metadata_type type;
22 union {
23 struct ip_tunnel_info tun_info;
24 struct hw_port_info port_info;
25 } u;
26};
27
28static inline struct metadata_dst *skb_metadata_dst(const 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
38static inline struct ip_tunnel_info *
39skb_tunnel_info(const struct sk_buff *skb)
40{
41 struct metadata_dst *md_dst = skb_metadata_dst(skb);
42 struct dst_entry *dst;
43
44 if (md_dst && md_dst->type == METADATA_IP_TUNNEL)
45 return &md_dst->u.tun_info;
46
47 dst = skb_dst(skb);
48 if (dst && dst->lwtstate)
49 return lwt_tun_info(dst->lwtstate);
50
51 return NULL;
52}
53
54static inline bool skb_valid_dst(const struct sk_buff *skb)
55{
56 struct dst_entry *dst = skb_dst(skb);
57
58 return dst && !(dst->flags & DST_METADATA);
59}
60
61static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a,
62 const struct sk_buff *skb_b)
63{
64 const struct metadata_dst *a, *b;
65
66 if (!(skb_a->_skb_refdst | skb_b->_skb_refdst))
67 return 0;
68
69 a = (const struct metadata_dst *) skb_dst(skb_a);
70 b = (const struct metadata_dst *) skb_dst(skb_b);
71
72 if (!a != !b || a->type != b->type)
73 return 1;
74
75 switch (a->type) {
76 case METADATA_HW_PORT_MUX:
77 return memcmp(&a->u.port_info, &b->u.port_info,
78 sizeof(a->u.port_info));
79 case METADATA_IP_TUNNEL:
80 return memcmp(&a->u.tun_info, &b->u.tun_info,
81 sizeof(a->u.tun_info) +
82 a->u.tun_info.options_len);
83 default:
84 return 1;
85 }
86}
87
88void metadata_dst_free(struct metadata_dst *);
89struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type,
90 gfp_t flags);
91void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst);
92struct metadata_dst __percpu *
93metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags);
94
95static inline struct metadata_dst *tun_rx_dst(int md_size)
96{
97 struct metadata_dst *tun_dst;
98
99 tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
100 if (!tun_dst)
101 return NULL;
102
103 tun_dst->u.tun_info.options_len = 0;
104 tun_dst->u.tun_info.mode = 0;
105 return tun_dst;
106}
107
108static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb)
109{
110 struct metadata_dst *md_dst = skb_metadata_dst(skb);
111 int md_size;
112 struct metadata_dst *new_md;
113
114 if (!md_dst || md_dst->type != METADATA_IP_TUNNEL)
115 return ERR_PTR(-EINVAL);
116
117 md_size = md_dst->u.tun_info.options_len;
118 new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
119 if (!new_md)
120 return ERR_PTR(-ENOMEM);
121
122 memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
123 sizeof(struct ip_tunnel_info) + md_size);
124 skb_dst_drop(skb);
125 dst_hold(&new_md->dst);
126 skb_dst_set(skb, &new_md->dst);
127 return new_md;
128}
129
130static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb)
131{
132 struct metadata_dst *dst;
133
134 dst = tun_dst_unclone(skb);
135 if (IS_ERR(dst))
136 return NULL;
137
138 return &dst->u.tun_info;
139}
140
141static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr,
142 __be32 daddr,
143 __u8 tos, __u8 ttl,
144 __be16 tp_dst,
145 __be16 flags,
146 __be64 tunnel_id,
147 int md_size)
148{
149 struct metadata_dst *tun_dst;
150
151 tun_dst = tun_rx_dst(md_size);
152 if (!tun_dst)
153 return NULL;
154
155 ip_tunnel_key_init(&tun_dst->u.tun_info.key,
156 saddr, daddr, tos, ttl,
157 0, 0, tp_dst, tunnel_id, flags);
158 return tun_dst;
159}
160
161static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb,
162 __be16 flags,
163 __be64 tunnel_id,
164 int md_size)
165{
166 const struct iphdr *iph = ip_hdr(skb);
167
168 return __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl,
169 0, flags, tunnel_id, md_size);
170}
171
172static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr,
173 const struct in6_addr *daddr,
174 __u8 tos, __u8 ttl,
175 __be16 tp_dst,
176 __be32 label,
177 __be16 flags,
178 __be64 tunnel_id,
179 int md_size)
180{
181 struct metadata_dst *tun_dst;
182 struct ip_tunnel_info *info;
183
184 tun_dst = tun_rx_dst(md_size);
185 if (!tun_dst)
186 return NULL;
187
188 info = &tun_dst->u.tun_info;
189 info->mode = IP_TUNNEL_INFO_IPV6;
190 info->key.tun_flags = flags;
191 info->key.tun_id = tunnel_id;
192 info->key.tp_src = 0;
193 info->key.tp_dst = tp_dst;
194
195 info->key.u.ipv6.src = *saddr;
196 info->key.u.ipv6.dst = *daddr;
197
198 info->key.tos = tos;
199 info->key.ttl = ttl;
200 info->key.label = label;
201
202 return tun_dst;
203}
204
205static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb,
206 __be16 flags,
207 __be64 tunnel_id,
208 int md_size)
209{
210 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
211
212 return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr,
213 ipv6_get_dsfield(ip6h), ip6h->hop_limit,
214 0, ip6_flowlabel(ip6h), flags, tunnel_id,
215 md_size);
216}
217#endif /* __NET_DST_METADATA_H */
218