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Thomas Graff38a9eb2015-07-21 10:43:56 +02001#ifndef __NET_DST_METADATA_H
2#define __NET_DST_METADATA_H 1
3
4#include <linux/skbuff.h>
5#include <net/ip_tunnels.h>
6#include <net/dst.h>
7
8struct metadata_dst {
9 struct dst_entry dst;
Thomas Grafee122c72015-07-21 10:43:58 +020010 union {
11 struct ip_tunnel_info tun_info;
12 } u;
Thomas Graff38a9eb2015-07-21 10:43:56 +020013};
14
15static inline struct metadata_dst *skb_metadata_dst(struct sk_buff *skb)
16{
17 struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb);
18
19 if (md_dst && md_dst->dst.flags & DST_METADATA)
20 return md_dst;
21
22 return NULL;
23}
24
Jiri Benc61adedf2015-08-20 13:56:25 +020025static inline struct ip_tunnel_info *skb_tunnel_info(struct sk_buff *skb)
Thomas Grafee122c72015-07-21 10:43:58 +020026{
27 struct metadata_dst *md_dst = skb_metadata_dst(skb);
Jiri Benc61adedf2015-08-20 13:56:25 +020028 struct dst_entry *dst;
Thomas Grafee122c72015-07-21 10:43:58 +020029
30 if (md_dst)
31 return &md_dst->u.tun_info;
32
Jiri Benc61adedf2015-08-20 13:56:25 +020033 dst = skb_dst(skb);
34 if (dst && dst->lwtstate)
35 return lwt_tun_info(dst->lwtstate);
Thomas Graf3093fbe2015-07-21 10:44:00 +020036
Thomas Grafee122c72015-07-21 10:43:58 +020037 return NULL;
38}
39
Thomas Graff38a9eb2015-07-21 10:43:56 +020040static inline bool skb_valid_dst(const struct sk_buff *skb)
41{
42 struct dst_entry *dst = skb_dst(skb);
43
44 return dst && !(dst->flags & DST_METADATA);
45}
46
Jesse Grossce87fc62016-01-20 17:59:49 -080047static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a,
48 const struct sk_buff *skb_b)
49{
50 const struct metadata_dst *a, *b;
51
52 if (!(skb_a->_skb_refdst | skb_b->_skb_refdst))
53 return 0;
54
55 a = (const struct metadata_dst *) skb_dst(skb_a);
56 b = (const struct metadata_dst *) skb_dst(skb_b);
57
58 if (!a != !b || a->u.tun_info.options_len != b->u.tun_info.options_len)
59 return 1;
60
61 return memcmp(&a->u.tun_info, &b->u.tun_info,
62 sizeof(a->u.tun_info) + a->u.tun_info.options_len);
63}
64
Paolo Abenid71785f2016-02-12 15:43:57 +010065void metadata_dst_free(struct metadata_dst *);
Thomas Graff38a9eb2015-07-21 10:43:56 +020066struct metadata_dst *metadata_dst_alloc(u8 optslen, gfp_t flags);
Alexei Starovoitovd3aa45c2015-07-30 15:36:57 -070067struct metadata_dst __percpu *metadata_dst_alloc_percpu(u8 optslen, gfp_t flags);
Thomas Graff38a9eb2015-07-21 10:43:56 +020068
Pravin B Shelar4c222792015-08-30 18:09:38 -070069static inline struct metadata_dst *tun_rx_dst(int md_size)
Pravin B Shelarc29a70d2015-08-26 23:46:50 -070070{
71 struct metadata_dst *tun_dst;
Pravin B Shelarc29a70d2015-08-26 23:46:50 -070072
73 tun_dst = metadata_dst_alloc(md_size, GFP_ATOMIC);
74 if (!tun_dst)
75 return NULL;
76
Pravin B Shelar4c222792015-08-30 18:09:38 -070077 tun_dst->u.tun_info.options_len = 0;
78 tun_dst->u.tun_info.mode = 0;
Pravin B Shelarc29a70d2015-08-26 23:46:50 -070079 return tun_dst;
80}
81
Pravin B Shelarfc4099f2015-10-22 18:17:16 -070082static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb)
83{
84 struct metadata_dst *md_dst = skb_metadata_dst(skb);
Tobias Klauserf63ce5b2015-11-04 13:49:49 +010085 int md_size;
Pravin B Shelarfc4099f2015-10-22 18:17:16 -070086 struct metadata_dst *new_md;
87
88 if (!md_dst)
89 return ERR_PTR(-EINVAL);
90
Tobias Klauserf63ce5b2015-11-04 13:49:49 +010091 md_size = md_dst->u.tun_info.options_len;
Pravin B Shelarfc4099f2015-10-22 18:17:16 -070092 new_md = metadata_dst_alloc(md_size, GFP_ATOMIC);
93 if (!new_md)
94 return ERR_PTR(-ENOMEM);
95
96 memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
97 sizeof(struct ip_tunnel_info) + md_size);
98 skb_dst_drop(skb);
99 dst_hold(&new_md->dst);
100 skb_dst_set(skb, &new_md->dst);
101 return new_md;
102}
103
104static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb)
105{
106 struct metadata_dst *dst;
107
108 dst = tun_dst_unclone(skb);
109 if (IS_ERR(dst))
110 return NULL;
111
112 return &dst->u.tun_info;
113}
114
Pravin B Shelarc29a70d2015-08-26 23:46:50 -0700115static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb,
116 __be16 flags,
117 __be64 tunnel_id,
118 int md_size)
119{
120 const struct iphdr *iph = ip_hdr(skb);
121 struct metadata_dst *tun_dst;
Pravin B Shelarc29a70d2015-08-26 23:46:50 -0700122
Pravin B Shelar4c222792015-08-30 18:09:38 -0700123 tun_dst = tun_rx_dst(md_size);
Pravin B Shelarc29a70d2015-08-26 23:46:50 -0700124 if (!tun_dst)
125 return NULL;
126
Pravin B Shelar4c222792015-08-30 18:09:38 -0700127 ip_tunnel_key_init(&tun_dst->u.tun_info.key,
128 iph->saddr, iph->daddr, iph->tos, iph->ttl,
Daniel Borkmann13461142016-03-09 03:00:02 +0100129 0, 0, 0, tunnel_id, flags);
Pravin B Shelarc29a70d2015-08-26 23:46:50 -0700130 return tun_dst;
131}
132
133static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb,
134 __be16 flags,
135 __be64 tunnel_id,
136 int md_size)
137{
138 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
139 struct metadata_dst *tun_dst;
140 struct ip_tunnel_info *info;
141
Pravin B Shelar4c222792015-08-30 18:09:38 -0700142 tun_dst = tun_rx_dst(md_size);
Pravin B Shelarc29a70d2015-08-26 23:46:50 -0700143 if (!tun_dst)
144 return NULL;
145
146 info = &tun_dst->u.tun_info;
Pravin B Shelar4c222792015-08-30 18:09:38 -0700147 info->mode = IP_TUNNEL_INFO_IPV6;
148 info->key.tun_flags = flags;
149 info->key.tun_id = tunnel_id;
150 info->key.tp_src = 0;
151 info->key.tp_dst = 0;
152
Pravin B Shelarc29a70d2015-08-26 23:46:50 -0700153 info->key.u.ipv6.src = ip6h->saddr;
154 info->key.u.ipv6.dst = ip6h->daddr;
Daniel Borkmann13461142016-03-09 03:00:02 +0100155
Pravin B Shelarc29a70d2015-08-26 23:46:50 -0700156 info->key.tos = ipv6_get_dsfield(ip6h);
157 info->key.ttl = ip6h->hop_limit;
Daniel Borkmann13461142016-03-09 03:00:02 +0100158 info->key.label = ip6_flowlabel(ip6h);
159
Pravin B Shelarc29a70d2015-08-26 23:46:50 -0700160 return tun_dst;
161}
162
Thomas Graff38a9eb2015-07-21 10:43:56 +0200163#endif /* __NET_DST_METADATA_H */