1 #ifndef __NET_DST_METADATA_H
2 #define __NET_DST_METADATA_H 1
4 #include <linux/skbuff.h>
5 #include <net/ip_tunnels.h>
11 struct ip_tunnel_info tun_info;
15 static inline struct metadata_dst *skb_metadata_dst(struct sk_buff *skb)
17 struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb);
19 if (md_dst && md_dst->dst.flags & DST_METADATA)
25 static inline struct ip_tunnel_info *skb_tunnel_info(struct sk_buff *skb)
27 struct metadata_dst *md_dst = skb_metadata_dst(skb);
28 struct dst_entry *dst;
31 return &md_dst->u.tun_info;
34 if (dst && dst->lwtstate &&
35 (dst->lwtstate->type == LWTUNNEL_ENCAP_IP ||
36 dst->lwtstate->type == LWTUNNEL_ENCAP_IP6))
37 return lwt_tun_info(dst->lwtstate);
42 static inline bool skb_valid_dst(const struct sk_buff *skb)
44 struct dst_entry *dst = skb_dst(skb);
46 return dst && !(dst->flags & DST_METADATA);
49 static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a,
50 const struct sk_buff *skb_b)
52 const struct metadata_dst *a, *b;
54 if (!(skb_a->_skb_refdst | skb_b->_skb_refdst))
57 a = (const struct metadata_dst *) skb_dst(skb_a);
58 b = (const struct metadata_dst *) skb_dst(skb_b);
60 if (!a != !b || a->u.tun_info.options_len != b->u.tun_info.options_len)
63 return memcmp(&a->u.tun_info, &b->u.tun_info,
64 sizeof(a->u.tun_info) + a->u.tun_info.options_len);
67 struct metadata_dst *metadata_dst_alloc(u8 optslen, gfp_t flags);
68 struct metadata_dst __percpu *metadata_dst_alloc_percpu(u8 optslen, gfp_t flags);
70 static inline struct metadata_dst *tun_rx_dst(int md_size)
72 struct metadata_dst *tun_dst;
74 tun_dst = metadata_dst_alloc(md_size, GFP_ATOMIC);
78 tun_dst->u.tun_info.options_len = 0;
79 tun_dst->u.tun_info.mode = 0;
83 static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb)
85 struct metadata_dst *md_dst = skb_metadata_dst(skb);
87 struct metadata_dst *new_md;
90 return ERR_PTR(-EINVAL);
92 md_size = md_dst->u.tun_info.options_len;
93 new_md = metadata_dst_alloc(md_size, GFP_ATOMIC);
95 return ERR_PTR(-ENOMEM);
97 memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
98 sizeof(struct ip_tunnel_info) + md_size);
100 dst_hold(&new_md->dst);
101 skb_dst_set(skb, &new_md->dst);
105 static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb)
107 struct metadata_dst *dst;
109 dst = tun_dst_unclone(skb);
113 return &dst->u.tun_info;
116 static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb,
121 const struct iphdr *iph = ip_hdr(skb);
122 struct metadata_dst *tun_dst;
124 tun_dst = tun_rx_dst(md_size);
128 ip_tunnel_key_init(&tun_dst->u.tun_info.key,
129 iph->saddr, iph->daddr, iph->tos, iph->ttl,
130 0, 0, tunnel_id, flags);
134 static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb,
139 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
140 struct metadata_dst *tun_dst;
141 struct ip_tunnel_info *info;
143 tun_dst = tun_rx_dst(md_size);
147 info = &tun_dst->u.tun_info;
148 info->mode = IP_TUNNEL_INFO_IPV6;
149 info->key.tun_flags = flags;
150 info->key.tun_id = tunnel_id;
151 info->key.tp_src = 0;
152 info->key.tp_dst = 0;
154 info->key.u.ipv6.src = ip6h->saddr;
155 info->key.u.ipv6.dst = ip6h->daddr;
156 info->key.tos = ipv6_get_dsfield(ip6h);
157 info->key.ttl = ip6h->hop_limit;
161 #endif /* __NET_DST_METADATA_H */