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