Commit | Line | Data |
---|---|---|
f38a9eb1 TG |
1 | #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 | ||
8 | struct metadata_dst { | |
9 | struct dst_entry dst; | |
ee122c79 TG |
10 | union { |
11 | struct ip_tunnel_info tun_info; | |
12 | } u; | |
f38a9eb1 TG |
13 | }; |
14 | ||
15 | static 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 | ||
61adedf3 | 25 | static inline struct ip_tunnel_info *skb_tunnel_info(struct sk_buff *skb) |
ee122c79 TG |
26 | { |
27 | struct metadata_dst *md_dst = skb_metadata_dst(skb); | |
61adedf3 | 28 | struct dst_entry *dst; |
ee122c79 TG |
29 | |
30 | if (md_dst) | |
31 | return &md_dst->u.tun_info; | |
32 | ||
61adedf3 JB |
33 | dst = skb_dst(skb); |
34 | if (dst && dst->lwtstate) | |
35 | return lwt_tun_info(dst->lwtstate); | |
3093fbe7 | 36 | |
ee122c79 TG |
37 | return NULL; |
38 | } | |
39 | ||
f38a9eb1 TG |
40 | static 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 | ||
ce87fc6c JG |
47 | static 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 | ||
f38a9eb1 | 65 | struct metadata_dst *metadata_dst_alloc(u8 optslen, gfp_t flags); |
d3aa45ce | 66 | struct metadata_dst __percpu *metadata_dst_alloc_percpu(u8 optslen, gfp_t flags); |
f38a9eb1 | 67 | |
4c222798 | 68 | static inline struct metadata_dst *tun_rx_dst(int md_size) |
c29a70d2 PS |
69 | { |
70 | struct metadata_dst *tun_dst; | |
c29a70d2 PS |
71 | |
72 | tun_dst = metadata_dst_alloc(md_size, GFP_ATOMIC); | |
73 | if (!tun_dst) | |
74 | return NULL; | |
75 | ||
4c222798 PS |
76 | tun_dst->u.tun_info.options_len = 0; |
77 | tun_dst->u.tun_info.mode = 0; | |
c29a70d2 PS |
78 | return tun_dst; |
79 | } | |
80 | ||
fc4099f1 PS |
81 | static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb) |
82 | { | |
83 | struct metadata_dst *md_dst = skb_metadata_dst(skb); | |
f63ce5b6 | 84 | int md_size; |
fc4099f1 PS |
85 | struct metadata_dst *new_md; |
86 | ||
87 | if (!md_dst) | |
88 | return ERR_PTR(-EINVAL); | |
89 | ||
f63ce5b6 | 90 | md_size = md_dst->u.tun_info.options_len; |
fc4099f1 PS |
91 | new_md = metadata_dst_alloc(md_size, GFP_ATOMIC); |
92 | if (!new_md) | |
93 | return ERR_PTR(-ENOMEM); | |
94 | ||
95 | memcpy(&new_md->u.tun_info, &md_dst->u.tun_info, | |
96 | sizeof(struct ip_tunnel_info) + md_size); | |
97 | skb_dst_drop(skb); | |
98 | dst_hold(&new_md->dst); | |
99 | skb_dst_set(skb, &new_md->dst); | |
100 | return new_md; | |
101 | } | |
102 | ||
103 | static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb) | |
104 | { | |
105 | struct metadata_dst *dst; | |
106 | ||
107 | dst = tun_dst_unclone(skb); | |
108 | if (IS_ERR(dst)) | |
109 | return NULL; | |
110 | ||
111 | return &dst->u.tun_info; | |
112 | } | |
113 | ||
c29a70d2 PS |
114 | static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb, |
115 | __be16 flags, | |
116 | __be64 tunnel_id, | |
117 | int md_size) | |
118 | { | |
119 | const struct iphdr *iph = ip_hdr(skb); | |
120 | struct metadata_dst *tun_dst; | |
c29a70d2 | 121 | |
4c222798 | 122 | tun_dst = tun_rx_dst(md_size); |
c29a70d2 PS |
123 | if (!tun_dst) |
124 | return NULL; | |
125 | ||
4c222798 PS |
126 | ip_tunnel_key_init(&tun_dst->u.tun_info.key, |
127 | iph->saddr, iph->daddr, iph->tos, iph->ttl, | |
128 | 0, 0, tunnel_id, flags); | |
c29a70d2 PS |
129 | return tun_dst; |
130 | } | |
131 | ||
132 | static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb, | |
133 | __be16 flags, | |
134 | __be64 tunnel_id, | |
135 | int md_size) | |
136 | { | |
137 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
138 | struct metadata_dst *tun_dst; | |
139 | struct ip_tunnel_info *info; | |
140 | ||
4c222798 | 141 | tun_dst = tun_rx_dst(md_size); |
c29a70d2 PS |
142 | if (!tun_dst) |
143 | return NULL; | |
144 | ||
145 | info = &tun_dst->u.tun_info; | |
4c222798 PS |
146 | info->mode = IP_TUNNEL_INFO_IPV6; |
147 | info->key.tun_flags = flags; | |
148 | info->key.tun_id = tunnel_id; | |
149 | info->key.tp_src = 0; | |
150 | info->key.tp_dst = 0; | |
151 | ||
c29a70d2 PS |
152 | info->key.u.ipv6.src = ip6h->saddr; |
153 | info->key.u.ipv6.dst = ip6h->daddr; | |
154 | info->key.tos = ipv6_get_dsfield(ip6h); | |
155 | info->key.ttl = ip6h->hop_limit; | |
156 | return tun_dst; | |
157 | } | |
158 | ||
f38a9eb1 | 159 | #endif /* __NET_DST_METADATA_H */ |