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 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 65 void metadata_dst_free(struct metadata_dst *); 66 struct metadata_dst *metadata_dst_alloc(u8 optslen, gfp_t flags); 67 struct metadata_dst __percpu *metadata_dst_alloc_percpu(u8 optslen, gfp_t flags); 68 69 static inline struct metadata_dst *tun_rx_dst(int md_size) 70 { 71 struct metadata_dst *tun_dst; 72 73 tun_dst = metadata_dst_alloc(md_size, GFP_ATOMIC); 74 if (!tun_dst) 75 return NULL; 76 77 tun_dst->u.tun_info.options_len = 0; 78 tun_dst->u.tun_info.mode = 0; 79 return tun_dst; 80 } 81 82 static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb) 83 { 84 struct metadata_dst *md_dst = skb_metadata_dst(skb); 85 int md_size; 86 struct metadata_dst *new_md; 87 88 if (!md_dst) 89 return ERR_PTR(-EINVAL); 90 91 md_size = md_dst->u.tun_info.options_len; 92 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 } 103 104 static 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 } 114 115 static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr, 116 __be32 daddr, 117 __u8 tos, __u8 ttl, 118 __be16 tp_dst, 119 __be16 flags, 120 __be64 tunnel_id, 121 int md_size) 122 { 123 struct metadata_dst *tun_dst; 124 125 tun_dst = tun_rx_dst(md_size); 126 if (!tun_dst) 127 return NULL; 128 129 ip_tunnel_key_init(&tun_dst->u.tun_info.key, 130 saddr, daddr, tos, ttl, 131 0, 0, tp_dst, tunnel_id, flags); 132 return tun_dst; 133 } 134 135 static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb, 136 __be16 flags, 137 __be64 tunnel_id, 138 int md_size) 139 { 140 const struct iphdr *iph = ip_hdr(skb); 141 142 return __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl, 143 0, flags, tunnel_id, md_size); 144 } 145 146 static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr, 147 const struct in6_addr *daddr, 148 __u8 tos, __u8 ttl, 149 __be16 tp_dst, 150 __be32 label, 151 __be16 flags, 152 __be64 tunnel_id, 153 int md_size) 154 { 155 struct metadata_dst *tun_dst; 156 struct ip_tunnel_info *info; 157 158 tun_dst = tun_rx_dst(md_size); 159 if (!tun_dst) 160 return NULL; 161 162 info = &tun_dst->u.tun_info; 163 info->mode = IP_TUNNEL_INFO_IPV6; 164 info->key.tun_flags = flags; 165 info->key.tun_id = tunnel_id; 166 info->key.tp_src = 0; 167 info->key.tp_dst = tp_dst; 168 169 info->key.u.ipv6.src = *saddr; 170 info->key.u.ipv6.dst = *daddr; 171 172 info->key.tos = tos; 173 info->key.ttl = ttl; 174 info->key.label = label; 175 176 return tun_dst; 177 } 178 179 static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb, 180 __be16 flags, 181 __be64 tunnel_id, 182 int md_size) 183 { 184 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 185 186 return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr, 187 ipv6_get_dsfield(ip6h), ip6h->hop_limit, 188 0, ip6_flowlabel(ip6h), flags, tunnel_id, 189 md_size); 190 } 191 #endif /* __NET_DST_METADATA_H */ 192