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.h> 7 #include <net/ip_tunnels.h> 8 #include <net/macsec.h> 9 #include <net/dst.h> 10 11 enum metadata_type { 12 METADATA_IP_TUNNEL, 13 METADATA_HW_PORT_MUX, 14 METADATA_MACSEC, 15 METADATA_XFRM, 16 }; 17 18 struct hw_port_info { 19 struct net_device *lower_dev; 20 u32 port_id; 21 }; 22 23 struct macsec_info { 24 sci_t sci; 25 }; 26 27 struct xfrm_md_info { 28 u32 if_id; 29 int link; 30 struct dst_entry *dst_orig; 31 }; 32 33 struct metadata_dst { 34 struct dst_entry dst; 35 enum metadata_type type; 36 union { 37 struct ip_tunnel_info tun_info; 38 struct hw_port_info port_info; 39 struct macsec_info macsec_info; 40 struct xfrm_md_info xfrm_info; 41 } u; 42 }; 43 44 static inline struct metadata_dst *skb_metadata_dst(const struct sk_buff *skb) 45 { 46 struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb); 47 48 if (md_dst && md_dst->dst.flags & DST_METADATA) 49 return md_dst; 50 51 return NULL; 52 } 53 54 static inline struct ip_tunnel_info * 55 skb_tunnel_info(const struct sk_buff *skb) 56 { 57 struct metadata_dst *md_dst = skb_metadata_dst(skb); 58 struct dst_entry *dst; 59 60 if (md_dst && md_dst->type == METADATA_IP_TUNNEL) 61 return &md_dst->u.tun_info; 62 63 dst = skb_dst(skb); 64 if (dst && dst->lwtstate && 65 (dst->lwtstate->type == LWTUNNEL_ENCAP_IP || 66 dst->lwtstate->type == LWTUNNEL_ENCAP_IP6)) 67 return lwt_tun_info(dst->lwtstate); 68 69 return NULL; 70 } 71 72 static inline struct xfrm_md_info *lwt_xfrm_info(struct lwtunnel_state *lwt) 73 { 74 return (struct xfrm_md_info *)lwt->data; 75 } 76 77 static inline struct xfrm_md_info *skb_xfrm_md_info(const struct sk_buff *skb) 78 { 79 struct metadata_dst *md_dst = skb_metadata_dst(skb); 80 struct dst_entry *dst; 81 82 if (md_dst && md_dst->type == METADATA_XFRM) 83 return &md_dst->u.xfrm_info; 84 85 dst = skb_dst(skb); 86 if (dst && dst->lwtstate && 87 dst->lwtstate->type == LWTUNNEL_ENCAP_XFRM) 88 return lwt_xfrm_info(dst->lwtstate); 89 90 return NULL; 91 } 92 93 static inline bool skb_valid_dst(const struct sk_buff *skb) 94 { 95 struct dst_entry *dst = skb_dst(skb); 96 97 return dst && !(dst->flags & DST_METADATA); 98 } 99 100 static inline int skb_metadata_dst_cmp(const struct sk_buff *skb_a, 101 const struct sk_buff *skb_b) 102 { 103 const struct metadata_dst *a, *b; 104 105 if (!(skb_a->_skb_refdst | skb_b->_skb_refdst)) 106 return 0; 107 108 a = (const struct metadata_dst *) skb_dst(skb_a); 109 b = (const struct metadata_dst *) skb_dst(skb_b); 110 111 if (!a != !b || a->type != b->type) 112 return 1; 113 114 switch (a->type) { 115 case METADATA_HW_PORT_MUX: 116 return memcmp(&a->u.port_info, &b->u.port_info, 117 sizeof(a->u.port_info)); 118 case METADATA_IP_TUNNEL: 119 return memcmp(&a->u.tun_info, &b->u.tun_info, 120 sizeof(a->u.tun_info) + 121 a->u.tun_info.options_len); 122 case METADATA_MACSEC: 123 return memcmp(&a->u.macsec_info, &b->u.macsec_info, 124 sizeof(a->u.macsec_info)); 125 case METADATA_XFRM: 126 return memcmp(&a->u.xfrm_info, &b->u.xfrm_info, 127 sizeof(a->u.xfrm_info)); 128 default: 129 return 1; 130 } 131 } 132 133 void metadata_dst_free(struct metadata_dst *); 134 struct metadata_dst *metadata_dst_alloc(u8 optslen, enum metadata_type type, 135 gfp_t flags); 136 void metadata_dst_free_percpu(struct metadata_dst __percpu *md_dst); 137 struct metadata_dst __percpu * 138 metadata_dst_alloc_percpu(u8 optslen, enum metadata_type type, gfp_t flags); 139 140 static inline struct metadata_dst *tun_rx_dst(int md_size) 141 { 142 struct metadata_dst *tun_dst; 143 144 tun_dst = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); 145 if (!tun_dst) 146 return NULL; 147 148 tun_dst->u.tun_info.options_len = 0; 149 tun_dst->u.tun_info.mode = 0; 150 return tun_dst; 151 } 152 153 static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb) 154 { 155 struct metadata_dst *md_dst = skb_metadata_dst(skb); 156 int md_size; 157 struct metadata_dst *new_md; 158 159 if (!md_dst || md_dst->type != METADATA_IP_TUNNEL) 160 return ERR_PTR(-EINVAL); 161 162 md_size = md_dst->u.tun_info.options_len; 163 new_md = metadata_dst_alloc(md_size, METADATA_IP_TUNNEL, GFP_ATOMIC); 164 if (!new_md) 165 return ERR_PTR(-ENOMEM); 166 167 memcpy(&new_md->u.tun_info, &md_dst->u.tun_info, 168 sizeof(struct ip_tunnel_info) + md_size); 169 #ifdef CONFIG_DST_CACHE 170 /* Unclone the dst cache if there is one */ 171 if (new_md->u.tun_info.dst_cache.cache) { 172 int ret; 173 174 ret = dst_cache_init(&new_md->u.tun_info.dst_cache, GFP_ATOMIC); 175 if (ret) { 176 metadata_dst_free(new_md); 177 return ERR_PTR(ret); 178 } 179 } 180 #endif 181 182 skb_dst_drop(skb); 183 skb_dst_set(skb, &new_md->dst); 184 return new_md; 185 } 186 187 static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb) 188 { 189 struct metadata_dst *dst; 190 191 dst = tun_dst_unclone(skb); 192 if (IS_ERR(dst)) 193 return NULL; 194 195 return &dst->u.tun_info; 196 } 197 198 static inline struct metadata_dst *__ip_tun_set_dst(__be32 saddr, 199 __be32 daddr, 200 __u8 tos, __u8 ttl, 201 __be16 tp_dst, 202 const unsigned long *flags, 203 __be64 tunnel_id, 204 int md_size) 205 { 206 struct metadata_dst *tun_dst; 207 208 tun_dst = tun_rx_dst(md_size); 209 if (!tun_dst) 210 return NULL; 211 212 ip_tunnel_key_init(&tun_dst->u.tun_info.key, 213 saddr, daddr, tos, ttl, 214 0, 0, tp_dst, tunnel_id, flags); 215 return tun_dst; 216 } 217 218 static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb, 219 const unsigned long *flags, 220 __be64 tunnel_id, 221 int md_size) 222 { 223 const struct iphdr *iph = ip_hdr(skb); 224 struct metadata_dst *tun_dst; 225 226 tun_dst = __ip_tun_set_dst(iph->saddr, iph->daddr, iph->tos, iph->ttl, 227 0, flags, tunnel_id, md_size); 228 229 if (tun_dst && (iph->frag_off & htons(IP_DF))) 230 __set_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, 231 tun_dst->u.tun_info.key.tun_flags); 232 return tun_dst; 233 } 234 235 static inline struct metadata_dst *__ipv6_tun_set_dst(const struct in6_addr *saddr, 236 const struct in6_addr *daddr, 237 __u8 tos, __u8 ttl, 238 __be16 tp_dst, 239 __be32 label, 240 const unsigned long *flags, 241 __be64 tunnel_id, 242 int md_size) 243 { 244 struct metadata_dst *tun_dst; 245 struct ip_tunnel_info *info; 246 247 tun_dst = tun_rx_dst(md_size); 248 if (!tun_dst) 249 return NULL; 250 251 info = &tun_dst->u.tun_info; 252 info->mode = IP_TUNNEL_INFO_IPV6; 253 ip_tunnel_flags_copy(info->key.tun_flags, flags); 254 info->key.tun_id = tunnel_id; 255 info->key.tp_src = 0; 256 info->key.tp_dst = tp_dst; 257 258 info->key.u.ipv6.src = *saddr; 259 info->key.u.ipv6.dst = *daddr; 260 261 info->key.tos = tos; 262 info->key.ttl = ttl; 263 info->key.label = label; 264 265 return tun_dst; 266 } 267 268 static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb, 269 const unsigned long *flags, 270 __be64 tunnel_id, 271 int md_size) 272 { 273 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 274 275 return __ipv6_tun_set_dst(&ip6h->saddr, &ip6h->daddr, 276 ipv6_get_dsfield(ip6h), ip6h->hop_limit, 277 0, ip6_flowlabel(ip6h), flags, tunnel_id, 278 md_size); 279 } 280 #endif /* __NET_DST_METADATA_H */ 281