1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __NET_DST_METADATA_H 3 #define __NET_DST_METADATA_H 1 4 5 #include <linux/skbuff.h> 6 #include <net/ip_tunnels.h> 7 #include <net/dst.h> 8 9 enum metadata_type { 10 METADATA_IP_TUNNEL, 11 METADATA_HW_PORT_MUX, 12 }; 13 14 struct hw_port_info { 15 struct net_device *lower_dev; 16 u32 port_id; 17 }; 18 19 struct metadata_dst { 20 struct dst_entry dst; 21 enum metadata_type type; 22 union { 23 struct ip_tunnel_info tun_info; 24 struct hw_port_info port_info; 25 } u; 26 }; 27 28 static inline struct metadata_dst *skb_metadata_dst(struct sk_buff *skb) 29 { 30 struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb); 31 32 if (md_dst && md_dst->dst.flags & DST_METADATA) 33 return md_dst; 34 35 return NULL; 36 } 37 38 static inline struct ip_tunnel_info *skb_tunnel_info(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 struct metadata_dst __percpu * 91 metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags); 92 93 static inline struct metadata_dst *tun_rx_dst(int md_size) 94 { 95 struct metadata_dst *tun_dst; 96 97 tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); 98 if (!tun_dst) 99 return NULL; 100 101 tun_dst->u.tun_info.options_len = 0; 102 tun_dst->u.tun_info.mode = 0; 103 return tun_dst; 104 } 105 106 static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb) 107 { 108 struct metadata_dst *md_dst = skb_metadata_dst(skb); 109 int md_size; 110 struct metadata_dst *new_md; 111 112 if (!md_dst || md_dst->type != METADATA_IP_TUNNEL) 113 return ERR_PTR(-EINVAL); 114 115 md_size = md_dst->u.tun_info.options_len; 116 new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); 117 if (!new_md) 118 return ERR_PTR(-ENOMEM); 119 120 memcpy(&new_md->u.tun_info, &md_dst->u.tun_info, 121 sizeof(struct ip_tunnel_info) + md_size); 122 skb_dst_drop(skb); 123 dst_hold(&new_md->dst); 124 skb_dst_set(skb, &new_md->dst); 125 return new_md; 126 } 127 128 static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb) 129 { 130 struct metadata_dst *dst; 131 132 dst = tun_dst_unclone(skb); 133 if (IS_ERR(dst)) 134 return NULL; 135 136 return &dst->u.tun_info; 137 } 138 139 static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr, 140 __be32 daddr, 141 __u8 tos, __u8 ttl, 142 __be16 tp_dst, 143 __be16 flags, 144 __be64 tunnel_id, 145 int md_size) 146 { 147 struct metadata_dst *tun_dst; 148 149 tun_dst = tun_rx_dst(md_size); 150 if (!tun_dst) 151 return NULL; 152 153 ip_tunnel_key_init(&tun_dst->u.tun_info.key, 154 saddr, daddr, tos, ttl, 155 0, 0, tp_dst, tunnel_id, flags); 156 return tun_dst; 157 } 158 159 static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb, 160 __be16 flags, 161 __be64 tunnel_id, 162 int md_size) 163 { 164 const struct iphdr *iph = ip_hdr(skb); 165 166 return __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl, 167 0, flags, tunnel_id, md_size); 168 } 169 170 static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr, 171 const struct in6_addr *daddr, 172 __u8 tos, __u8 ttl, 173 __be16 tp_dst, 174 __be32 label, 175 __be16 flags, 176 __be64 tunnel_id, 177 int md_size) 178 { 179 struct metadata_dst *tun_dst; 180 struct ip_tunnel_info *info; 181 182 tun_dst = tun_rx_dst(md_size); 183 if (!tun_dst) 184 return NULL; 185 186 info = &tun_dst->u.tun_info; 187 info->mode = IP_TUNNEL_INFO_IPV6; 188 info->key.tun_flags = flags; 189 info->key.tun_id = tunnel_id; 190 info->key.tp_src = 0; 191 info->key.tp_dst = tp_dst; 192 193 info->key.u.ipv6.src = *saddr; 194 info->key.u.ipv6.dst = *daddr; 195 196 info->key.tos = tos; 197 info->key.ttl = ttl; 198 info->key.label = label; 199 200 return tun_dst; 201 } 202 203 static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb, 204 __be16 flags, 205 __be64 tunnel_id, 206 int md_size) 207 { 208 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 209 210 return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr, 211 ipv6_get_dsfield(ip6h), ip6h->hop_limit, 212 0, ip6_flowlabel(ip6h), flags, tunnel_id, 213 md_size); 214 } 215 #endif /* __NET_DST_METADATA_H */ 216