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