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/macsec.h> 8 #include <net/dst.h> 9 10 enum metadata_type { 11 METADATA_IP_TUNNEL, 12 METADATA_HW_PORT_MUX, 13 METADATA_MACSEC, 14 METADATA_XFRM, 15 }; 16 17 struct hw_port_info { 18 struct net_device *lower_dev; 19 u32 port_id; 20 }; 21 22 struct macsec_info { 23 sci_t sci; 24 }; 25 26 struct xfrm_md_info { 27 u32 if_id; 28 int link; 29 struct dst_entry *dst_orig; 30 }; 31 32 struct metadata_dst { 33 struct dst_entry dst; 34 enum metadata_type type; 35 union { 36 struct ip_tunnel_info tun_info; 37 struct hw_port_info port_info; 38 struct macsec_info macsec_info; 39 struct xfrm_md_info xfrm_info; 40 } u; 41 }; 42 43 static inline struct metadata_dst *skb_metadata_dst(const struct sk_buff *skb) 44 { 45 struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb); 46 47 if (md_dst && md_dst->dst.flags & DST_METADATA) 48 return md_dst; 49 50 return NULL; 51 } 52 53 static inline struct ip_tunnel_info * 54 skb_tunnel_info(const struct sk_buff *skb) 55 { 56 struct metadata_dst *md_dst = skb_metadata_dst(skb); 57 struct dst_entry *dst; 58 59 if (md_dst && md_dst->type == METADATA_IP_TUNNEL) 60 return &md_dst->u.tun_info; 61 62 dst = skb_dst(skb); 63 if (dst && dst->lwtstate && 64 (dst->lwtstate->type == LWTUNNEL_ENCAP_IP || 65 dst->lwtstate->type == LWTUNNEL_ENCAP_IP6)) 66 return lwt_tun_info(dst->lwtstate); 67 68 return NULL; 69 } 70 71 static inline struct xfrm_md_info *lwt_xfrm_info(struct lwtunnel_state *lwt) 72 { 73 return (struct xfrm_md_info *)lwt->data; 74 } 75 76 static inline struct xfrm_md_info *skb_xfrm_md_info(const struct sk_buff *skb) 77 { 78 struct metadata_dst *md_dst = skb_metadata_dst(skb); 79 struct dst_entry *dst; 80 81 if (md_dst && md_dst->type == METADATA_XFRM) 82 return &md_dst->u.xfrm_info; 83 84 dst = skb_dst(skb); 85 if (dst && dst->lwtstate && 86 dst->lwtstate->type == LWTUNNEL_ENCAP_XFRM) 87 return lwt_xfrm_info(dst->lwtstate); 88 89 return NULL; 90 } 91 92 static inline bool skb_valid_dst(const struct sk_buff *skb) 93 { 94 struct dst_entry *dst = skb_dst(skb); 95 96 return dst && !(dst->flags & DST_METADATA); 97 } 98 99 static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a, 100 const struct sk_buff *skb_b) 101 { 102 const struct metadata_dst *a, *b; 103 104 if (!(skb_a->_skb_refdst | skb_b->_skb_refdst)) 105 return 0; 106 107 a = (const struct metadata_dst *) skb_dst(skb_a); 108 b = (const struct metadata_dst *) skb_dst(skb_b); 109 110 if (!a != !b || a->type != b->type) 111 return 1; 112 113 switch (a->type) { 114 case METADATA_HW_PORT_MUX: 115 return memcmp(&a->u.port_info, &b->u.port_info, 116 sizeof(a->u.port_info)); 117 case METADATA_IP_TUNNEL: 118 return memcmp(&a->u.tun_info, &b->u.tun_info, 119 sizeof(a->u.tun_info) + 120 a->u.tun_info.options_len); 121 case METADATA_MACSEC: 122 return memcmp(&a->u.macsec_info, &b->u.macsec_info, 123 sizeof(a->u.macsec_info)); 124 case METADATA_XFRM: 125 return memcmp(&a->u.xfrm_info, &b->u.xfrm_info, 126 sizeof(a->u.xfrm_info)); 127 default: 128 return 1; 129 } 130 } 131 132 void metadata_dst_free(struct metadata_dst *); 133 struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type, 134 gfp_t flags); 135 void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst); 136 struct metadata_dst __percpu * 137 metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags); 138 139 static inline struct metadata_dst *tun_rx_dst(int md_size) 140 { 141 struct metadata_dst *tun_dst; 142 143 tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); 144 if (!tun_dst) 145 return NULL; 146 147 tun_dst->u.tun_info.options_len = 0; 148 tun_dst->u.tun_info.mode = 0; 149 return tun_dst; 150 } 151 152 static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb) 153 { 154 struct metadata_dst *md_dst = skb_metadata_dst(skb); 155 int md_size; 156 struct metadata_dst *new_md; 157 158 if (!md_dst || md_dst->type != METADATA_IP_TUNNEL) 159 return ERR_PTR(-EINVAL); 160 161 md_size = md_dst->u.tun_info.options_len; 162 new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); 163 if (!new_md) 164 return ERR_PTR(-ENOMEM); 165 166 memcpy(&new_md->u.tun_info, &md_dst->u.tun_info, 167 sizeof(struct ip_tunnel_info) + md_size); 168 #ifdef CONFIG_DST_CACHE 169 /* Unclone the dst cache if there is one */ 170 if (new_md->u.tun_info.dst_cache.cache) { 171 int ret; 172 173 ret = dst_cache_init(&new_md->u.tun_info.dst_cache, GFP_ATOMIC); 174 if (ret) { 175 metadata_dst_free(new_md); 176 return ERR_PTR(ret); 177 } 178 } 179 #endif 180 181 skb_dst_drop(skb); 182 skb_dst_set(skb, &new_md->dst); 183 return new_md; 184 } 185 186 static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb) 187 { 188 struct metadata_dst *dst; 189 190 dst = tun_dst_unclone(skb); 191 if (IS_ERR(dst)) 192 return NULL; 193 194 return &dst->u.tun_info; 195 } 196 197 static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr, 198 __be32 daddr, 199 __u8 tos, __u8 ttl, 200 __be16 tp_dst, 201 __be16 flags, 202 __be64 tunnel_id, 203 int md_size) 204 { 205 struct metadata_dst *tun_dst; 206 207 tun_dst = tun_rx_dst(md_size); 208 if (!tun_dst) 209 return NULL; 210 211 ip_tunnel_key_init(&tun_dst->u.tun_info.key, 212 saddr, daddr, tos, ttl, 213 0, 0, tp_dst, tunnel_id, flags); 214 return tun_dst; 215 } 216 217 static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb, 218 __be16 flags, 219 __be64 tunnel_id, 220 int md_size) 221 { 222 const struct iphdr *iph = ip_hdr(skb); 223 224 return __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl, 225 0, flags, tunnel_id, md_size); 226 } 227 228 static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr, 229 const struct in6_addr *daddr, 230 __u8 tos, __u8 ttl, 231 __be16 tp_dst, 232 __be32 label, 233 __be16 flags, 234 __be64 tunnel_id, 235 int md_size) 236 { 237 struct metadata_dst *tun_dst; 238 struct ip_tunnel_info *info; 239 240 tun_dst = tun_rx_dst(md_size); 241 if (!tun_dst) 242 return NULL; 243 244 info = &tun_dst->u.tun_info; 245 info->mode = IP_TUNNEL_INFO_IPV6; 246 info->key.tun_flags = flags; 247 info->key.tun_id = tunnel_id; 248 info->key.tp_src = 0; 249 info->key.tp_dst = tp_dst; 250 251 info->key.u.ipv6.src = *saddr; 252 info->key.u.ipv6.dst = *daddr; 253 254 info->key.tos = tos; 255 info->key.ttl = ttl; 256 info->key.label = label; 257 258 return tun_dst; 259 } 260 261 static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb, 262 __be16 flags, 263 __be64 tunnel_id, 264 int md_size) 265 { 266 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 267 268 return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr, 269 ipv6_get_dsfield(ip6h), ip6h->hop_limit, 270 0, ip6_flowlabel(ip6h), flags, tunnel_id, 271 md_size); 272 } 273 #endif /* __NET_DST_METADATA_H */ 274