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