1
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 (dst->lwtstate->type == LWTUNNEL_ENCAP_IP ||
50 dst->lwtstate->type == LWTUNNEL_ENCAP_IP6))
51 return lwt_tun_info(dst->lwtstate);
52
53 return NULL;
54}
55
56static inline bool skb_valid_dst(const struct sk_buff *skb)
57{
58 struct dst_entry *dst = skb_dst(skb);
59
60 return dst && !(dst->flags & DST_METADATA);
61}
62
63static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a,
64 const struct sk_buff *skb_b)
65{
66 const struct metadata_dst *a, *b;
67
68 if (!(skb_a->_skb_refdst | skb_b->_skb_refdst))
69 return 0;
70
71 a = (const struct metadata_dst *) skb_dst(skb_a);
72 b = (const struct metadata_dst *) skb_dst(skb_b);
73
74 if (!a != !b || a->type != b->type)
75 return 1;
76
77 switch (a->type) {
78 case METADATA_HW_PORT_MUX:
79 return memcmp(&a->u.port_info, &b->u.port_info,
80 sizeof(a->u.port_info));
81 case METADATA_IP_TUNNEL:
82 return memcmp(&a->u.tun_info, &b->u.tun_info,
83 sizeof(a->u.tun_info) +
84 a->u.tun_info.options_len);
85 default:
86 return 1;
87 }
88}
89
90void metadata_dst_free(struct metadata_dst *);
91struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type,
92 gfp_t flags);
93void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst);
94struct metadata_dst __percpu *
95metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags);
96
97static inline struct metadata_dst *tun_rx_dst(int md_size)
98{
99 struct metadata_dst *tun_dst;
100
101 tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
102 if (!tun_dst)
103 return NULL;
104
105 tun_dst->u.tun_info.options_len = 0;
106 tun_dst->u.tun_info.mode = 0;
107 return tun_dst;
108}
109
110static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb)
111{
112 struct metadata_dst *md_dst = skb_metadata_dst(skb);
113 int md_size;
114 struct metadata_dst *new_md;
115
116 if (!md_dst || md_dst->type != METADATA_IP_TUNNEL)
117 return ERR_PTR(-EINVAL);
118
119 md_size = md_dst->u.tun_info.options_len;
120 new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC);
121 if (!new_md)
122 return ERR_PTR(-ENOMEM);
123
124 memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
125 sizeof(struct ip_tunnel_info) + md_size);
126 skb_dst_drop(skb);
127 dst_hold(&new_md->dst);
128 skb_dst_set(skb, &new_md->dst);
129 return new_md;
130}
131
132static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb)
133{
134 struct metadata_dst *dst;
135
136 dst = tun_dst_unclone(skb);
137 if (IS_ERR(dst))
138 return NULL;
139
140 return &dst->u.tun_info;
141}
142
143static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr,
144 __be32 daddr,
145 __u8 tos, __u8 ttl,
146 __be16 tp_dst,
147 __be16 flags,
148 __be64 tunnel_id,
149 int md_size)
150{
151 struct metadata_dst *tun_dst;
152
153 tun_dst = tun_rx_dst(md_size);
154 if (!tun_dst)
155 return NULL;
156
157 ip_tunnel_key_init(&tun_dst->u.tun_info.key,
158 saddr, daddr, tos, ttl,
159 0, 0, tp_dst, tunnel_id, flags);
160 return tun_dst;
161}
162
163static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb,
164 __be16 flags,
165 __be64 tunnel_id,
166 int md_size)
167{
168 const struct iphdr *iph = ip_hdr(skb);
169
170 return __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl,
171 0, flags, tunnel_id, md_size);
172}
173
174static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr,
175 const struct in6_addr *daddr,
176 __u8 tos, __u8 ttl,
177 __be16 tp_dst,
178 __be32 label,
179 __be16 flags,
180 __be64 tunnel_id,
181 int md_size)
182{
183 struct metadata_dst *tun_dst;
184 struct ip_tunnel_info *info;
185
186 tun_dst = tun_rx_dst(md_size);
187 if (!tun_dst)
188 return NULL;
189
190 info = &tun_dst->u.tun_info;
191 info->mode = IP_TUNNEL_INFO_IPV6;
192 info->key.tun_flags = flags;
193 info->key.tun_id = tunnel_id;
194 info->key.tp_src = 0;
195 info->key.tp_dst = tp_dst;
196
197 info->key.u.ipv6.src = *saddr;
198 info->key.u.ipv6.dst = *daddr;
199
200 info->key.tos = tos;
201 info->key.ttl = ttl;
202 info->key.label = label;
203
204 return tun_dst;
205}
206
207static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb,
208 __be16 flags,
209 __be64 tunnel_id,
210 int md_size)
211{
212 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
213
214 return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr,
215 ipv6_get_dsfield(ip6h), ip6h->hop_limit,
216 0, ip6_flowlabel(ip6h), flags, tunnel_id,
217 md_size);
218}
219#endif
220
