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 *tun_dst_unclone(struct sk_buff *skb) 64 { 65 struct metadata_dst *md_dst = skb_metadata_dst(skb); 66 int md_size; 67 struct metadata_dst *new_md; 68 69 if (!md_dst) 70 return ERR_PTR(-EINVAL); 71 72 md_size = md_dst->u.tun_info.options_len; 73 new_md = metadata_dst_alloc(md_size, GFP_ATOMIC); 74 if (!new_md) 75 return ERR_PTR(-ENOMEM); 76 77 memcpy(&new_md->u.tun_info, &md_dst->u.tun_info, 78 sizeof(struct ip_tunnel_info) + md_size); 79 skb_dst_drop(skb); 80 dst_hold(&new_md->dst); 81 skb_dst_set(skb, &new_md->dst); 82 return new_md; 83 } 84 85 static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb) 86 { 87 struct metadata_dst *dst; 88 89 dst = tun_dst_unclone(skb); 90 if (IS_ERR(dst)) 91 return NULL; 92 93 return &dst->u.tun_info; 94 } 95 96 static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb, 97 __be16 flags, 98 __be64 tunnel_id, 99 int md_size) 100 { 101 const struct iphdr *iph = ip_hdr(skb); 102 struct metadata_dst *tun_dst; 103 104 tun_dst = tun_rx_dst(md_size); 105 if (!tun_dst) 106 return NULL; 107 108 ip_tunnel_key_init(&tun_dst->u.tun_info.key, 109 iph->saddr, iph->daddr, iph->tos, iph->ttl, 110 0, 0, tunnel_id, flags); 111 return tun_dst; 112 } 113 114 static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb, 115 __be16 flags, 116 __be64 tunnel_id, 117 int md_size) 118 { 119 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 120 struct metadata_dst *tun_dst; 121 struct ip_tunnel_info *info; 122 123 tun_dst = tun_rx_dst(md_size); 124 if (!tun_dst) 125 return NULL; 126 127 info = &tun_dst->u.tun_info; 128 info->mode = IP_TUNNEL_INFO_IPV6; 129 info->key.tun_flags = flags; 130 info->key.tun_id = tunnel_id; 131 info->key.tp_src = 0; 132 info->key.tp_dst = 0; 133 134 info->key.u.ipv6.src = ip6h->saddr; 135 info->key.u.ipv6.dst = ip6h->daddr; 136 info->key.tos = ipv6_get_dsfield(ip6h); 137 info->key.ttl = ip6h->hop_limit; 138 return tun_dst; 139 } 140 141 #endif /* __NET_DST_METADATA_H */ 142