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 enum metadata_type { 9 METADATA_IP_TUNNEL, 10 METADATA_HW_PORT_MUX, 11 }; 12 13 struct hw_port_info { 14 struct net_device *lower_dev; 15 u32 port_id; 16 }; 17 18 struct metadata_dst { 19 struct dst_entry dst; 20 enum metadata_type type; 21 union { 22 struct ip_tunnel_info tun_info; 23 struct hw_port_info port_info; 24 } u; 25 }; 26 27 static inline struct metadata_dst *skb_metadata_dst(const struct sk_buff *skb) 28 { 29 struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb); 30 31 if (md_dst && md_dst->dst.flags & DST_METADATA) 32 return md_dst; 33 34 return NULL; 35 } 36 37 static inline struct ip_tunnel_info * 38 skb_tunnel_info(const struct sk_buff *skb) 39 { 40 struct metadata_dst *md_dst = skb_metadata_dst(skb); 41 struct dst_entry *dst; 42 43 if (md_dst && md_dst->type == METADATA_IP_TUNNEL) 44 return &md_dst->u.tun_info; 45 46 dst = skb_dst(skb); 47 if (dst && dst->lwtstate) 48 return lwt_tun_info(dst->lwtstate); 49 50 return NULL; 51 } 52 53 static inline bool skb_valid_dst(const struct sk_buff *skb) 54 { 55 struct dst_entry *dst = skb_dst(skb); 56 57 return dst && !(dst->flags & DST_METADATA); 58 } 59 60 static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a, 61 const struct sk_buff *skb_b) 62 { 63 const struct metadata_dst *a, *b; 64 65 if (!(skb_a->_skb_refdst | skb_b->_skb_refdst)) 66 return 0; 67 68 a = (const struct metadata_dst *) skb_dst(skb_a); 69 b = (const struct metadata_dst *) skb_dst(skb_b); 70 71 if (!a != !b || a->type != b->type) 72 return 1; 73 74 switch (a->type) { 75 case METADATA_HW_PORT_MUX: 76 return memcmp(&a->u.port_info, &b->u.port_info, 77 sizeof(a->u.port_info)); 78 case METADATA_IP_TUNNEL: 79 return memcmp(&a->u.tun_info, &b->u.tun_info, 80 sizeof(a->u.tun_info) + 81 a->u.tun_info.options_len); 82 default: 83 return 1; 84 } 85 } 86 87 void metadata_dst_free(struct metadata_dst *); 88 struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type, 89 gfp_t flags); 90 void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst); 91 struct metadata_dst __percpu * 92 metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags); 93 94 static inline struct metadata_dst *tun_rx_dst(int md_size) 95 { 96 struct metadata_dst *tun_dst; 97 98 tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); 99 if (!tun_dst) 100 return NULL; 101 102 tun_dst->u.tun_info.options_len = 0; 103 tun_dst->u.tun_info.mode = 0; 104 return tun_dst; 105 } 106 107 static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb) 108 { 109 struct metadata_dst *md_dst = skb_metadata_dst(skb); 110 int md_size; 111 struct metadata_dst *new_md; 112 113 if (!md_dst || md_dst->type != METADATA_IP_TUNNEL) 114 return ERR_PTR(-EINVAL); 115 116 md_size = md_dst->u.tun_info.options_len; 117 new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); 118 if (!new_md) 119 return ERR_PTR(-ENOMEM); 120 121 memcpy(&new_md->u.tun_info, &md_dst->u.tun_info, 122 sizeof(struct ip_tunnel_info) + md_size); 123 skb_dst_drop(skb); 124 dst_hold(&new_md->dst); 125 skb_dst_set(skb, &new_md->dst); 126 return new_md; 127 } 128 129 static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb) 130 { 131 struct metadata_dst *dst; 132 133 dst = tun_dst_unclone(skb); 134 if (IS_ERR(dst)) 135 return NULL; 136 137 return &dst->u.tun_info; 138 } 139 140 static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr, 141 __be32 daddr, 142 __u8 tos, __u8 ttl, 143 __be16 tp_dst, 144 __be16 flags, 145 __be64 tunnel_id, 146 int md_size) 147 { 148 struct metadata_dst *tun_dst; 149 150 tun_dst = tun_rx_dst(md_size); 151 if (!tun_dst) 152 return NULL; 153 154 ip_tunnel_key_init(&tun_dst->u.tun_info.key, 155 saddr, daddr, tos, ttl, 156 0, 0, tp_dst, tunnel_id, flags); 157 return tun_dst; 158 } 159 160 static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb, 161 __be16 flags, 162 __be64 tunnel_id, 163 int md_size) 164 { 165 const struct iphdr *iph = ip_hdr(skb); 166 167 return __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl, 168 0, flags, tunnel_id, md_size); 169 } 170 171 static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr, 172 const struct in6_addr *daddr, 173 __u8 tos, __u8 ttl, 174 __be16 tp_dst, 175 __be32 label, 176 __be16 flags, 177 __be64 tunnel_id, 178 int md_size) 179 { 180 struct metadata_dst *tun_dst; 181 struct ip_tunnel_info *info; 182 183 tun_dst = tun_rx_dst(md_size); 184 if (!tun_dst) 185 return NULL; 186 187 info = &tun_dst->u.tun_info; 188 info->mode = IP_TUNNEL_INFO_IPV6; 189 info->key.tun_flags = flags; 190 info->key.tun_id = tunnel_id; 191 info->key.tp_src = 0; 192 info->key.tp_dst = tp_dst; 193 194 info->key.u.ipv6.src = *saddr; 195 info->key.u.ipv6.dst = *daddr; 196 197 info->key.tos = tos; 198 info->key.ttl = ttl; 199 info->key.label = label; 200 201 return tun_dst; 202 } 203 204 static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb, 205 __be16 flags, 206 __be64 tunnel_id, 207 int md_size) 208 { 209 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 210 211 return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr, 212 ipv6_get_dsfield(ip6h), ip6h->hop_limit, 213 0, ip6_flowlabel(ip6h), flags, tunnel_id, 214 md_size); 215 } 216 #endif /* __NET_DST_METADATA_H */ 217