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; 10 union { 11 struct ip_tunnel_info tun_info; 12 } u; 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 25 static inline struct ip_tunnel_info *skb_tunnel_info(struct sk_buff *skb) 26 { 27 struct metadata_dst *md_dst = skb_metadata_dst(skb); 28 struct dst_entry *dst; 29 30 if (md_dst) 31 return &md_dst->u.tun_info; 32 33 dst = skb_dst(skb); 34 if (dst && dst->lwtstate) 35 return lwt_tun_info(dst->lwtstate); 36 37 return NULL; 38 } 39 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 47 struct metadata_dst *metadata_dst_alloc(u8 optslen, gfp_t flags); 48 struct metadata_dst __percpu *metadata_dst_alloc_percpu(u8 optslen, gfp_t flags); 49 50 static inline struct metadata_dst *tun_rx_dst(int md_size) 51 { 52 struct metadata_dst *tun_dst; 53 54 tun_dst = metadata_dst_alloc(md_size, GFP_ATOMIC); 55 if (!tun_dst) 56 return NULL; 57 58 tun_dst->u.tun_info.options_len = 0; 59 tun_dst->u.tun_info.mode = 0; 60 return tun_dst; 61 } 62 63 static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb, 64 __be16 flags, 65 __be64 tunnel_id, 66 int md_size) 67 { 68 const struct iphdr *iph = ip_hdr(skb); 69 struct metadata_dst *tun_dst; 70 71 tun_dst = tun_rx_dst(md_size); 72 if (!tun_dst) 73 return NULL; 74 75 ip_tunnel_key_init(&tun_dst->u.tun_info.key, 76 iph->saddr, iph->daddr, iph->tos, iph->ttl, 77 0, 0, tunnel_id, flags); 78 return tun_dst; 79 } 80 81 static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb, 82 __be16 flags, 83 __be64 tunnel_id, 84 int md_size) 85 { 86 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 87 struct metadata_dst *tun_dst; 88 struct ip_tunnel_info *info; 89 90 tun_dst = tun_rx_dst(md_size); 91 if (!tun_dst) 92 return NULL; 93 94 info = &tun_dst->u.tun_info; 95 info->mode = IP_TUNNEL_INFO_IPV6; 96 info->key.tun_flags = flags; 97 info->key.tun_id = tunnel_id; 98 info->key.tp_src = 0; 99 info->key.tp_dst = 0; 100 101 info->key.u.ipv6.src = ip6h->saddr; 102 info->key.u.ipv6.dst = ip6h->daddr; 103 info->key.tos = ipv6_get_dsfield(ip6h); 104 info->key.ttl = ip6h->hop_limit; 105 return tun_dst; 106 } 107 108 #endif /* __NET_DST_METADATA_H */ 109